Technical Field of the Invention
The present invention relates to a composition comprising l-chloro-2,2-difluoroethane. The present invention also relates to the use of this composition as a synthetic intermediate or starting material or as a foam blowing agent.
BACKGROUND OF THE INVENTION
L-chloro-2,2-difluoroethane is a known foam blowing agent and can also be used as a starting material in preparing products for agrochemical or pharmaceutical field.

Ecological, toxicological and environmental constraints require the implementation of compositions in which the levels of certain impurities are reduced.

Summary of the Invention

The present invention relates to a composition comprising l-chloro-2,2-difluoroethane and at least one additional compound selected from the group consisting of 1,1-difluoroethylene, 1,1,1-trifluoroethane, chlorotrifluoroethylene, 1-chloro-l- fluoroethylene, 1,1-difluoroethane, trans-l-chloro-2-fluoroethylene, l-chloro-2,2,2-trifluoroethane, 1-chloro-1,2,2-trifluoroethane, cis-l-chloro-2- fluoroethylene, 2,2-dichloro-l, l, l-trifluoroethane, 1,1-dichloro-l-fluoroethane, 1,1-dichloroethylene, 1,2-dichloro-l-fluoroethylene, l, l-dichloro-2- fluoroethylene, l, 2-dichloro-l, l-difluoroethane, l, l-dichloro-2,2-difluoroethane, cis-1,2-dichloroethylene, l, 2,2-trichloro-l, l-difluoroethane, 1, 1,1-trichloroethane, 1,1-dichloroethane, 1,1,2-trichloro-l-fluoroethane, trichlorethylene, l, l, 2-trichloro-2-fluoroethane, 1,1,2-trichloroethane, 1,1, 2,2-tetrachloro-l-fluoroethane, tetrachlorethylene, 1,1,1,2-tetrachloroethane, 1,1,2,2-tetrachloroethane, 1,1,1,2,2-pentachloroethane, tetrachloromethane, 1,2, 2-trichloro-l-fluoroethylene, isomers of chloropropene, 1,2-dichloro-l-fluoroethylene, l-chloro-2-fluoroethane, 1-chloro-l-fluoroethane, l, l-chloro-2,2,2 -trifluoroethane, l, l, l-trichloro-2,2-difluoroethane, 1-chloride-, 1-fluoroethylene, H2O and HCl; said composition comprising at least 30% by weight of l-chloro-2,2-difluoroethane based on the total weight of the composition.

Preferably, the present invention relates to a composition comprising 1-chloro-2,2-difluoroethane and at least one additional compound selected from the group consisting of 1,1-difluoroethylene, chlorotrifluoroethylene, 1-chloro-l-fluoroethylene, 1.1 difluoroethane, trans-l-chloro-2-fluoroethylene, l-chloro-2,2,2-trifluoroethane, l-chloro-1,2,2-trifluoroethane, cis-l-chloro-2-fluoroethylene, 2,2 dichloro-l, l, l-trifluoroethane, 1,1-dichloro-1-fluoroethane, 1,2-dichloro-l-fluoroethylene, l, l-dichloro-2-fluoroethylene, l, 2-dichloro-l, l difluoroethane, l, l-dichloro-2,2-difluoroethane, cis-l, 2-dichloroethylene, l, 2,2-trichloro-l, l-difluoroethane, 1,1,1-trichloroethane, 1,1-dichloroethane , 1,1,2-trichloro-l-fluoroethane, trichlorethylene, l, l, 2-trichloro-2-fluoroethane, 1,1,2,2-tetrachloro-l-fluoroethane, tetrachlorethylene, 1,1,1,2 -tetrachloroethane, 1,1,2,2-tetrachloroethane, 1,1,1,2,2-pentachloroethane, tetrachloromethane, 1,2,2-trichloro-l-fluoroethylene, the isomer s of chloropropene, 1,2-dichloro-l-fluoroethylene, l-chloro-2-fluoroethane, 1-chloro-l-fluoroethane, l, l-chloro-2,2,2-trifluoroethane, l, l, l- trichloro-2,2-difluoroethane, 1-chloride-, 1-fluoroethylene, H2O and HCl; said composition comprising at least 30% by weight of l-chloro-2,2-difluoroethane based on the total weight of the composition.

Preferably, said composition comprises at least 40% by weight of l-chloro-2,2-difluoroethane based on the total weight of the composition, preferably at least 50% by weight of l-chloro-2,2-difluoroethane, of preferably at least 60% by weight of l-chloro-2,2-difluoroethane, in particular at least 80% by weight of l-chloro-2,2-difluoroethane, more particularly at least 90% by weight of l-chloro- 2,2-difluoroethane, preferentially at least 95% by weight of l-chloro-2,2-difluoroethane.

According to a preferred embodiment, said composition comprises less than 5% by weight of said at least one additional compound based on the total weight of the composition, preferably less than 4% by weight of said at least one additional compound, preferably less than 3 wt% of said at least one additional compound, more preferably less than 2% by weight of said at least one additional compound, in particular less than 1% by weight of said at least one additional compound, more preferably less than 1000 ppm of said at least one additional compound based on the total weight of the composition.

According to a preferred embodiment, said composition also comprises one of the compounds selected from the group consisting of trans-l, 2-dichloroethylene, 1,1,2-trifluoroethane and 1,2-dichloro-l-fluoroethane.

According to a preferred embodiment, said composition comprises l-chloro-2,2-difluoroethane, 1,1-dichloroethylene and optionally or not at least one compound

additionnel sélectionné parmi le groupe consistant en 1,1-difluoroethylene, 1,1,1-trifluoroethane, chlorotrifluoroethylene, 1-chloro-l-fluoroethylene, 1,1-difluoroethane, trans-l-chloro-2-fluoroethylene, 1,1,2-trifluoroethane, l-chloro-2,2,2-trifluoroethane, l-chloro-1,2,2-trifluoroethane, cis-l-chloro-2-fluoroethylene, 2,2-dichloro-l,l,l-trifluoroethane, 1,1-dichloro-1-fluorethane, 1,2-dichloro-l-fluoroethylene, l,l-dichloro-2-fluoroethylene, l,2-dichloro-l,l-difluoroethane, trans-l,2-dichloroethylene, l,l-dichloro-2,2-difluorethane, cis-1,2-dichloroethylene, l,2,2-trichloro-l,l-difluoroethane, 1,2-dichloro-l-fluoroethane, 1,1,1-trichloroethane, 1,1-dichloroethane, 1,1,2-trichloro-l-fluroethane, trichloroethylene, 1,1,2-trichloro-2-fluoroethane, 1,1,2-trichloroethane, 1,1,2,2-tetrachloro-l-fluoroethane, tetrachloroethylene, 1,1,1,2-tetrachloroethane, 1,1,2,2-tetrachloroethane, 1,1,1,2,2-pentachloroethane, tetrachloromethane, 1,2,2-trichloro-l-fluoroethylene, les isomères du chloropropène, 1,2-dichloro-l-fluoroethylene, l-chloro-2-fluoroethane, 1-chloro-l-fluoroethane, l,l-chloro-2,2,2-trifluoroethane, l,l,l-trichloro-2,2-difluoroethane, 1-chloroethylene, 1-fluoroethylene, H2O et HCI.

According to a preferred embodiment, said composition comprises l-chloro-2,2-difluoroethane, 1,1-dichloroethylene, trans-l, 2-dichloroethylene and optionally at least one additional compound selected from the group consisting of 1,1- difluoroethylene, 1,1,1-trifluoroethane, chlorotrifluoroethylene, 1-chloro-l-fluoroethylene, 1,1-difluoroethane, trans-l-chloro-2-fluoroethylene, 1,1,2-trifluoroethane, l-chloro-2, 2,2-trifluoroethane, l-chloro-1,2,2-trifluoroethane, cis-l-chloro-2-fluoroethylene, 2,2-dichloro-l, l, l-trifluoroethane, 1,1-dichloro-1- fluoroethane, l-chloro-2,2-difluoroethane, 1,2-dichloro-l-fluoroethylene, l, l-dichloro-2-fluoroethylene, l, 2-dichloro-l, l-difluoroethane, l, l-dichloro- 2,2-difluoroethane, cis-1,2-dichloroethylene, l, 2,2-trichloro-l, l-difluoroethane, 1,2-dichloro-l-fluoroethane, 1,1,1-trichloroethane, 1,1- dichloroethane, 1,1,2-trichloroethane-the-fluroethane, trichlorethylene, 1,1,2-trichloro-2-fluoroethane, 1,1,2-trichloroethane, 1,1,2,2-tetrachloro-l-fluoroe Thane, tetrachlorethylene, 1,1,1,2-tetrachloroethane, 1,1,2,2-tetrachloroethane, 1,1,1,2,2-pentachloroethane, tetrachloromethane, 1,2,2-trichloroethane-l-fluoroethylene, isomers of chloropropene, 1,2-dichloro-l-fluoroethylene, l-chloro-2-fluoroethane, 1-chloro-l-fluoroethane, l, l-chloro-2,2,2-trifluoroethane, l, l, l trichloro-2,2-difluoroethane, 1-chloride-, 1-fluoroethylene, H2O and HCl.

According to a preferred embodiment, said composition comprises l-chloro-2,2-difluoroethane, 1,1-dichloroethylene, trans-l, 2-dichloroethylene, l-chloro-2,2,2-trifluoroethane and 1.1, 2-trifluoroethane.

Preferably, said composition comprises at least 99.5% by weight of l-chloro-2,2-difluoroethane, less than 50 ppm of 1,1,2-trifluoroethane, less than 100 ppm of l-chloro-2,2 , 2-trifluoroethane and less than 5000 ppm of trans-l, 2-dichloroethylene and less than 50 ppm of 1,1-dichloroethylene.

In particular, said composition also comprises less than 500 ppm O h, preferably less than 400 ppm O h, preferably less than 300 ppm O h, in particular less than 100 ppm O h, more particularly less than 10 ppm.

More particularly, said composition also comprises at least one additional compound selected from the group consisting of 1,1-difluoroethylene, 1,1,1-trifluoroethane, chlorotrifluoroethylene, 1-chloro-l-fluoroethylene, 1,1-difluoroethane, trans l-chloro-2-fluoroethylene, l-chloro-l, 2,2-trifluoroethane, cis-l-chloro-2-fluoroethylene, 2,2-dichloro-l, l, l-trifluoroethane, 1,1-dichloro- l-fluoroethane, l-chloro-2,2-difluoroethane, 1,2-dichloro-l-fluoroethylene, l, l-dichloro-2-fluoroethylene, l, 2-dichloro-l, l-difluoroethane, 1,1- dichloro-2,2-difluoroethane, cis-l, 2-dichloroethylene, l, 2,2-trichloro-l, l-difluoroethane, 1,2-dichloro-l-fluoroethane, 1,1,1-trichloroethane, 1, 1-dichloroethane, 1,1,2-trichloro-l-fluroethane, trichlorethylene, l, l, 2-trichloro-2-fluoroethane, 1,1,2-trichloroethane, 1,1,2,2-tetrachloro-l- fluoroethane, tetrachlorethylene, 1,1,1,2-tetrachloroethane, 1,1,2,2-tetrachloroethane, 1,1,1,2,2-pentachloroethane, tetrachloromethane, 1,2,2-trichloroethane-the-fluoroethy lene, isomers of chloropropene, 1,2-dichloro-l-fluoroethylene, l-chloro-2-fluoroethane, 1-chloro-l-fluoroethane, l, l-chloro-2,2,2-trifluoroethane, l, l , l-trichloro-2,2-difluoroethane, 1-chloride-and 1-fluoroethylene.

According to a second aspect of the present invention, said composition is used as starting material for the synthesis of 2,2-difluoroethylamine.

According to a third aspect of the present invention, a process for preparing a compound of formula CF2CH2NHCH2A (I) is provided. Said method comprises the steps of:

(A) providing a composition according to any one of claims 1 to 11,

(b) reacting the composition from step (a) and an amine of formula ACH2NH2 (II) to obtain the compound of formula CF2CH2N HCH2A (I) wherein A is selected from the group consisting of pyrid-2 radical yl, pyrid-4-yl or pyrid-3-yl optionally substituted in 6-position by fluorine, chlorine, bromine, methyl, trifluoromethyl or trifluoromethoxy, or is a radical pyridazin-3-yl optionally substituted in 6-position by a chlorine atom or a methyl radical, or is a radical pyrazin-3-yl, 2-chloropyrazin-5-yl or l, 3-thiazol-5-yl optionally substituted in position 2 by a chlorine atom or a radical methyl, or is a radical pyrimidinyl, pyrazolyl, Thiophenyl, oxazolyl, isoxazolyl, 1,2,4-oxadiazolyl, isothiazolyl, 1,2,4-triazolyl or 1,2,5-thiadiazolyl optionally substituted by a fluorine atom, chlorine , bromine, cyano, nitro, Ci-C 4 alkyl optionally substituted with F and / or Cl, Ci-C3-alkylthio optional LEMENT substituted by F and / or Cl, C 1 -C 3 alkylsulphonyl optionally substituted with F and / or Cl, or is a pyrid-3-yl of the formula

wherein X is F, Cl, Br, I, C 1 alkyl-C6, Ci-C6-haloalkyl; and Y is

F, Cl, Br, I, C1-C6 alkyle, Ci-C6-halogénoalkyle, Ci-C6-halogénoalkoxy, -N3, -CN.

According to another aspect of the present invention, said composition is used as reactants for the synthesis of vinylidene fluoride and / or 1,2-difluoroethylene.

According to another aspect of the present invention, said composition is used as a foam or as a refrigerant expansion agent.

According to another aspect of the present invention, said composition is used as a reagent or a synthesis intermediate for the preparation of 2,2-difluoroethanol or for the preparation of compounds comprising a functional group sulfone, ether, ester, methacrylate or for the preparation of the éthyldifluorobromoacétate.

Detailed Description of the Invention

The present invention relates to a composition comprising l-chloro-2,2-difluoroethane. Said composition also comprises at least one additional compound selected from the group consisting of 1,1-difluoroethylene, 1,1,1-trifluoroethane, chlorotrifluoroethylene, 1-chloro-l-fluoroethylene, 1,1-difluoroethane, trans-l-chloro -2-fluoroethylene, l-chloro-2,2,2-trifluoroethane, l-chloro-l, 2,2-trifluoroethane, cis-l-chloro-2-fluoroethylene, 2,2-dichloro-l, l, l -trifluoroethane, 1,1-dichloro-l-fluoroethane, 1,1-dichloroethylene, 1,2-dichloro-l-fluoroethylene, l, l-dichloro-2-fluoroethylene, 1,2-dichloro-1,1-difluoroethane , l, l-dichloro-2,2-difluoroethane, cis-l, 2-dichloroethylene, 1,2,2-trichloro-1,1-difluoroethane, 1,1,1-trichloroethane, 1,1-dichloroethane, 1 , 1,2-trichloro-l-fluroethane, trichlorethylene, l, l, 2-trichloro-2-fluoroethane, 1,1,2-trichloroethane, 1,1,2,2-tetrachloro-l-fluoroethane, tetrachlorethylene, 1 , 1,1,2-tetrachloroethane, 1,1,2,2-tetrachloroethane, 1,1,1,2,2-pentachloroethane, tetrachloromethane, 1,2,2-trichloroethane-l-fluoroethylene, isomers chlor opropène, 1,2-dichloro-l-fluoroethylene, l-chloro-2-fluoroethane, 1-chloro-1-fluoroethane, l, l-chloro-2,2,2-trifluoroethane, l, l, l-trichloro- 2,2-difluoroethane, 1-chloride-, 1-fluoroethylene, H2O and HCl.

Preferably, the composition comprises l-chloro-2,2-difluoroethane and at least one additional compound selected from the group consisting of 1,1-difluoroethylene, chlorotrifluoroethylene, 1-chloro-l-fluoroethylene, 1,1-difluoroethane, trans -l-chloro-2-fluoroethylene, l-chloro-2,2,2-trifluoroethane, l-chloro-l, 2,2-trifluoroethane, cis-l-chloro-2-fluoroethylene, 2,2-dichloro-l , l, l-trifluoroethane, 1,1-dichloro-l-fluoroethane, 1,2-dichloro-l-fluoroethylene, l, l-dichloro-2-fluoroethylene, l, 2-dichloro-l, l-difluoroethane, 1 , 1-dichloro-2,2-difluoroethane, cis-l, 2-dichloroethylene, l, 2,2-trichloro-l, l-difluoroethane, 1,1,1-trichloroethane, 1,1-dichloroethane, 1.1 , 2-trichloro-l-fluoroethane, trichlorethylene, 1,1,2-trichloro-2-fluoroethane, 1,1,2,2-tetrachloro-l-fluoroethane, tetrachlorethylene, 1,1,1,2-tetrachloroethane, 1 , 1,2,2-tetrachloroethane, 1,1,1,2,2-pentachloroethane, tetrachloromethane, 1,2,2-trichloro-l-fluoroethylene, isomers of chloropropene, 1,2-dichloro- -fluoroethylene, l-chloro-2-fluoroethane, 1-chloro-l-fluoroethane, l, l-chloro-2,2,2-trifluoroethane, l, l, l-trichloro-2,2-difluoroethane, 1-chloride- , 1-fluoroethylene, H2O and HCl; said composition comprising at least 30% by weight of l-chloro-2,2-difluoroethane based on the total weight of the composition.

The term "at least one" refers to one or more, and includes compositions comprising 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 , 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41 42 or compound (s) additional (s) as described herein. Where more additional compounds, expressed as the content corresponds to the content of each of said additional compounds independently of the other additional compounds may be present in the composition.

Furthermore, said composition comprises at least 30% by weight of l-chloro-2,2-difluoroethane based on the total weight of the composition.

Preferably, the composition comprises at least 40% by weight of l-chloro-2,2-difluoroethane based on the total weight of the composition, preferably at least 50% by weight of l-chloro-2,2-difluoroethane, of preferably at least 60% by weight of l-chloro-2,2-difluoroethane, in particular at least 80% by weight of l-chloro-2,2-difluoroethane, more particularly at least 90% by weight of l-chloro- 2,2-difluoroethane, preferentially at least 95% by weight of l-chloro-2,2-difluoroethane.

Said composition comprises less than 40% by weight of said at least one additional compound based on the total weight of the composition, preferably less than 35% by weight,

preferably less than 30% by weight, more preferably less than 25% by weight, in particular less than 20% by weight, more preferably less than 10% by weight of said at least one additional compound based on the total weight of the composition.

Preferably the composition comprises less than 5% by weight of said at least one additional compound based on the total weight of the composition, preferably less than 4% by weight of said at least one additional compound, preferably less than 3% by weight of said at least one additional compound, more preferably less than 2% by weight of said at least one additional compound, in particular less than 1% by weight of said at least one additional compound, more preferably less than 1000 ppm of said at least one additional compound on the basis of the total weight of the composition.

According to a particular embodiment, said at least one additional compound may also be selected from trans-l, 2-dichloroethylene, 1,1,2-trifluoroethane and 1,2-dichloro-l-fluoroethane.

In any of the compositions described herein below, the content of each of the different compounds therein is detailed below.

Preferably, the content of 1,1-dichloroethylene in said composition is less than 2% by weight based on the total weight of the composition, preferably less than 1% by weight, preferably less than 0.5% by weight, more preferably less than lOOOppm, in particular less than 500 ppm, more preferably less than 100 ppm, less than 50 ppm preferred manner, more preferred manner less than 10 ppm, even more preferred less than 1 ppm. Alternatively, said composition may also be free of 1,1-dichloroethylene, that is to say less than 1 ppm based on the total weight of the composition.

The content of 1,1-difluoroethylene in said composition may be less than 1% by weight based on the total weight of the composition, preferably less than 0.5% by weight, preferably less than 1000 ppm, more preferably less than 500ppm , in particular less than 250 ppm, more preferably less than 200 ppm, less than 50 ppm preferred manner, more preferred manner less than 10 ppm, even more preferred less than 1 ppm. Alternatively, said composition may also be free of 1,1-difluoroethylene, that is to say less than 1 ppm based on the total weight of the composition.

1,1,1-trifluoroethane content in said composition is less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 2% by weight, more preferably less to 1% by weight, in particular less than 250 ppm, more preferably less than 200 ppm, less than 50 ppm preferred manner, more preferred manner less than 10 ppm, even more preferred less than 1 ppm. Alternatively, said composition may also be free of 1,1,1-trifluoroethane, that is to say less than 1 ppm based on the total weight of the composition.

The content of chlorotrifluoroethylene in said composition is less than 1000 ppm, preferably less than 500 ppm, preferably less than 250 ppm, more preferably less than 100 ppm, in particular less than 50 ppm. Alternatively, said composition may also be free of chlorotrifluoroethylene, that is to say less than 1 ppm based on the total weight of the composition.

The content of 1-chloro-l-fluoroethylene in said composition may be less than 1% by weight based on the total weight of the composition, preferably less than 5000 ppm, preferably less than 2500 ppm, more preferably less than 1000 ppm. Alternatively, said composition may also be free from 1-chloro-l-fluoroethylene, that is to say less than 1 ppm based on the total weight of the composition.

The content of 1,1-difluoroethane in said composition may be less than 1% by weight based on the total weight of the composition, preferably less than 5000 ppm, preferably less than 2500 ppm, more preferably less than 1000 ppm, in particular less than 500 ppm, more preferably less than 300 ppm. Alternatively, said composition may also be free of 1,1-difluoroethane, that is to say less than 1 ppm based on the total weight of the composition.

The content of trans-l-chloro-2-fluoroethylene in said composition is less than 2% by weight based on the total weight of the composition, preferably less than 1% by weight, preferably less than 8000 ppm, more preferably less to 5000 ppm, in particular less than 4000 ppm, more preferably less than 3000 ppm. Alternatively, said composition may also be free of trans-l-chloro-2-fluoroethylene, that is to say less than 1 ppm based on the total weight of the composition.

The 1,1,2-trifluoroethane content in said composition is less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less to 2% by weight, in particular less than 1% by weight, more preferably less than 1000 ppm, less than 500 ppm privileged manner, more preferred way of less than 100 ppm, even more preferred less than 50 ppm.

The content of l-chloro-2,2,2-trifluoroethane in said composition is less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight , more preferably less than 2% by weight, in particular less than 1% by weight, more preferably less than 1000 ppm, preferred manner of less than 500 ppm, more preferred way of less than 100 ppm, even more preferred less than 60 ppm.

The content of l-chloro-l, 2,2-trifluoroethane in said composition may be less than 1% by weight based on the total weight of the composition, preferably less than 5000 ppm, preferably less than 4000 ppm, more preferably less to 3000 ppm, in particular less than 2000 ppm, more preferably less than 1600 ppm. Alternatively, said composition may also be free of l-chloro-1,2,2-trifluoroethane, that is to say less than 1 ppm based on the total weight of the composition.

The content of cis-l-chloro-2-fluoroethylene in said composition is less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight, in particular less than 1% by weight, more preferably less than 8000 ppm. Alternatively, said composition may also be devoid of cis-l-chloro-2-fluoroethylene, that is to say less than 1 ppm based on the total weight of the composition.

The content of 2,2-dichloro-l, l, l-trifluoroethane in said composition may be less than 1% by weight based on the total weight of the composition, preferably less than 5000 ppm, preferably less than 4000 ppm, more preferably less than 3000 ppm, in particular less than 2000 ppm, more preferably less than 1000 ppm. Alternatively, said composition may also be free of 2,2-dichloro-l, l, l-trifluoroethane, that is to say less than 1 ppm based on the total weight of the composition.

The content of 1,1-dichloro-l-fluoroethane in said composition may be less than 1% by weight based on the total weight of the composition, preferably less than 5000 ppm, preferably less than 4000 ppm, more preferably less than 3000 ppm, in particular less than 2000 ppm, more preferably less than 1000 ppm. Alternatively, said composition may also be free of 1,1-dichloro-l-fluoroethane, that is to say less than 1 ppm based on the total weight of the composition.

The content of 1,2-dichloro-l-fluoroethylene in said composition may be less than 1% by weight based on the total weight of the composition, preferably less than 5000 ppm, preferably less than 4000 ppm, more preferably less than 3000 ppm, in particular less than 2000 ppm, more preferably less than 1000 ppm. Alternatively, said composition may also be free of 1,2-dichloro-l-fluoroethylene, that is to say less than 1 ppm based on the total weight of the composition.

The content of l, l-dichloro-2-fluoroethylene in said composition may be less than 1% by weight based on the total weight of the composition, preferably less than 5000 ppm, preferably less than 4000 ppm, more preferably less than 3000 ppm, in particular less than 2000 ppm, more preferably less than 1000 ppm. Alternatively, said composition may also be free of l, l-dichloro-2-fluoroethylene, that is to say less than 1 ppm based on the total weight of the composition.

The content of l, 2-dichloro-l, l-difluoroethane in said composition is less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight , more preferably less than 2% by weight, in particular less than 1% by weight, more preferably less than 5000 ppm, less than 2500 ppm privileged manner. Alternatively, said composition may also be free of l, 2-dichloro-l, l-difluoroethane, that is to say less than 1 ppm based on the total weight of the composition.

The content of trans-l, 2-dichloroethylene in said composition may be less than

30% by weight based on the total weight of the composition, preferably less than 20% by weight, preferably less than 15% by weight, more preferably less than 10% by weight, in particular less than 5% by weight, more particularly less than 1% by weight, less than 7500 ppm preferred manner, more preferred manner of less than 5000 ppm.

The content of l, l-dichloro-2,2-difluoroethane in said composition is less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight , more preferably less than 2% by weight, in particular less than 1% by weight. Alternatively, said composition may also be free of l, l-dichloro-2,2-difluoroethane, that is to say less than 1 ppm based on the total weight of the composition.

The content of cis-l, 2-dichloroethylene in said composition may be less than 40% by weight based on the total weight of the composition, preferably less than 30% by weight, preferably less than 20% by weight, more preferably less to 15% by weight, in particular less than 10% by weight, more particularly less than 5% by weight. Alternatively, said composition may also be devoid of cis-1,2-dichloroethylene, that is to say less than 1 ppm based on the total weight of the composition.

The content of l, 2,2-trichloro-l, l-difluoroethane in said composition is less than 2% by weight based on the total weight of the composition, preferably less than 1% by weight, preferably less than 5000 ppm , more preferably less than 2500 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner. Alternatively, said composition may also be free of l, 2,2-trichloro-l, l-difluoroethane, that is to say less than 1 ppm based on the total weight of the composition.

The content of 1,2-dichloro-l-fluoroethane in said composition may be less than 10% by weight based on the total weight of said composition, preferably less than 9 wt%, preferably less than 8% by weight, more preferably less than 7% by weight, in particular less than 6% by weight, more particularly less than 5% by weight, preferred manner less than 4% by weight. Alternatively, said composition may also be free of l, 2,2-trichloro-l, l-difluoroethane, that is to say less than 1 ppm based on the total weight of the composition.

1,1,1-trichloroethane content in said composition is less than 1% by weight based on the total weight of the composition, preferably less than 5000 ppm, preferably less than 4000 ppm, more preferably less than 3000 ppm, in particular less than 2000 ppm, more preferably less than 1000 ppm. Alternatively, said composition may also be free of 1,1,1-trichloroethane, that is to say less than 1 ppm based on the total weight of the composition.

The content of 1,1-dichloroethane in said composition may be less than 1% by weight based on the total weight of the composition, preferably less than 5000 ppm, preferably less than 4000 ppm, more preferably less than 3000 ppm, in particular less than 2000 ppm, more preferably less than 1000 ppm. Alternatively, said composition may also be free of 1,1-dichloroethane, that is to say less than 1 ppm based on the total weight of the composition.

The content of 1,1,2-trichloro-l-fluroethane in said composition is less than 2% by weight based on the total weight of the composition, preferably less than 1% by weight, preferably less than 5000 ppm, more preferably less than 2500 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm,

less than 100 ppm preferred. Alternatively, said composition may also be free of 1,1,2-trichloro-l-fluroethane, that is to say less than 1 ppm based on the total weight of the composition.

The content of trichlorethylene in said composition is less than 3% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 10,000 ppm, more preferably less than 7500 ppm, in particular less than 5000 ppm, more preferably less than 3500 ppm. Alternatively, said composition may also be free of trichlorethylene, that is to say less than 1 ppm based on the total weight of the composition.

The content of l, l, 2-trichloro-2-fluoroethane in said composition is less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight , more preferably less than 2% by weight, in particular less than 1% by weight. Alternatively, said composition may also be free of l, l, 2-trichloro-2-fluoroethane, that is to say less than 1 ppm based on the total weight of the composition.

The 1,1,2-trichloroethane content in said composition is less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less to 2% by weight, in particular less than 1% by weight. Alternatively, said composition may also be free of 1,1,2-trichloroethane, that is to say less than 1 ppm based on the total weight of the composition.

The content of 1,1,2,2-tetrachloro-l-fluoroethane in said composition is less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner. Alternatively, said composition may also be free of 1,1,2,2-tetrachloro-l-fluoroethane, that is to say less than 1 ppm based on the total weight of the composition.

The content of tetrachlorethylene in said composition is less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner. Alternatively, said composition may also be

devoid of tetrachlorethylene, that is to say less than 1 ppm based on the total weight of the composition.

The 1,1,1,2-tetrachloroethane content in said composition is less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner. Alternatively, said composition may also be free of 1,1,1,2-tetrachloroethane, that is to say less than 1 ppm based on the total weight of the composition.

The content of 1,1,2,2-tetrachloroethane in said composition may be less than

5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight, in particular less than 1% by weight. Alternatively, said composition may also be free of 1,1,1,2-tetrachloroethane, that is to say less than 1 ppm based on the total weight of the composition.

The content of 1,1,1,2,2-pentachloroethane in said composition is less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight , more preferably less than 5000 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner, more preferred manner less than 50 ppm. Alternatively, said composition may also be free of 1,1,1,2,2-pentachloroethane, that is to say less than 1 ppm based on the total weight of the composition.

The content of tetrachloromethane in said composition is less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner, more preferred manner less than 50 ppm. Alternatively, said composition may also be free of tetrachloromethane, that is to say less than 1 ppm based on the total weight of the composition.

The content of 1,2,2-trichloro-l-fluoroethylene in said composition is less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight , more preferably less than 5000 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm,

preferred way of less than 100 ppm, more preferred manner less than 50 ppm. Alternatively, said composition may also be free of 1,2,2-trichloro-l-fluoroethylene, that is to say less than 1 ppm based on the total weight of the composition.

The isomer content of chloropropene in said composition is less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner, more preferred manner less than 50 ppm. Alternatively, said composition may also be free of isomers of chloropropene, that is to say less than 1 ppm based on the total weight of the composition.

The content of 1,2-dichloro-l-fluoroethylene in said composition is less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner, more preferred manner less than 50 ppm. Alternatively, said composition may also be free of 1,2-dichloro-l-fluoroethylene that is to say less than 1 ppm based on the total weight of the composition.

The content of l-chloro-2-fluoroethane in said composition is less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less to 5000 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner, more preferred manner less than 50 ppm. Alternatively, said composition may also be free of l-chloro-2-fluoroethane is to say less than 1 ppm based on the total weight of the composition.

The content of 1-chloro-l-fluoroethane in said composition is less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less to 5000 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner, more preferred manner less than 50 ppm. Alternatively, said composition may also be free from 1-chloro-l-fluoroethane is to say less than 1 ppm based on the total weight of the composition.

The content of l, l-chloro-2,2,2-trifluoroethane in said composition is less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner, more preferred manner less than 50 ppm. Alternatively, said composition may also be free of l, l-chloro-2,2,2-trifluoroethane that is to say less than 1 ppm based on the total weight of the composition.

The content of l, l, l-trichloro-2,2-difluoroethane in said composition is less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner, more preferred manner less than 50 ppm. Alternatively, said composition may also be free of l, l, l-trichloro-2,2-difluoroethane is to say less than 1 ppm based on the total weight of the composition.

The content of 1-chloride-in said composition is less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner, more preferred manner less than 50 ppm. Alternatively, said composition may also be free of 1-chloride-that is to say less than 1 ppm based on the total weight of the composition.

The content of 1-fluoroethylene in said composition is less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner, more preferred manner less than 50 ppm. Alternatively, said composition may also be free of 1-fluoroethylene that is to say less than 1 ppm based on the total weight of the composition.

The content of H2O in said composition may be less than 1% by weight based on the total weight of the composition, preferably less than 5000 ppm, preferably less than 3000 ppm, more preferably less than 1000 ppm, in particular less than 750 ppm , more preferably less than 500 ppm, preferred manner of less than 250 ppm, more preferred manner less than 100 ppm, still more preferred manner of less than 50 ppm, the most preferred manner of less than 10 ppm.

The HCl content in said composition is such that the pH thereof is between 6 and 9, preferably between 6.5 and 8.5, preferably between 6.5 and 8.0, more preferably between 7 0 and 8.0. The HCl content may be less than 5%, preferably less than 2%, preferably less than 5000 ppm, more preferably less than 1000 ppm, in particular less than 100 ppm, more preferably less than 1 ppm.

According to a first aspect of the invention, said composition comprises l-chloro-2,2-difluoroethane and 1,1-dichloroethylene. Preferably, said composition comprises 1-chloro-2,2-difluoroethane, 1,1-dichloroethylene and optionally at least one additional compound selected from the group consisting of 1,1-difluoroethylene, 1,1,1-trifluoroethane, chlorotrifluoroethylene, 1-chloro-l-fluoroethylene, 1,1-difluoroethane, trans-l-chloro-2-fluoroethylene, 1,1,2-trifluoroethane, l-chloro-2,2,2-trifluoroethane, l-chloro-1, 2,2-trifluoroethane, cis-l-chloro-2-fluoroethylene, 2,2-dichloro-l, l, l-trifluoroethane, 1,1-dichloro-1-fluoroethane, 1,2-dichloro-l-fluoroethylene, l, l-dichloro-2-fluoroethylene, l, 2-dichloro-l, l-difluoroethane, trans-l, 2-dichloroethylene, l, l-dichloro-2,2-difluoroethane, cis-1,2-dichloroethylene, l, 2,2-trichloro-l, l-difluoroethane, 1,2-dichloro-l-fluoroethane, 1,1,1-trichloroethane, 1,1-dichloroethane, 1,1,2-trichloro-l-fluroethane, trichlorethylene, 1,1,2-trichloro-2-fluoroethane, 1,1,2-trichloroethane, 1,1,2,2-tetrachloro-l-fluoroethane, tetrachlorethylene, 1,1,1,2-tetrachloroethane, 1,1,2,2-tetrachloroethane, 1,1,1,2,2-pentachloroethane, tetrachloromethane, 1,2,2-trichloro-l-fluoroethylene, isomers of chloropropene, 1,2-dichloro-l-fluoroethylene , l-chloro-2-fluoroethane, 1-chloro-l-fluoroethane, l, l-chloro-2,2,2-trifluoroethane, l, l, l-trichloro-2,2-difluoroethane, 1-chloride-, 1 -fluoroethylene and H2O. The composition may also include HCl.

The composition may thus comprise at least 40% by weight, preferably at least 50% by weight, preferably at least 60% by weight, in particular at least 80% by weight, more preferably at least 90% by weight, in a privileged manner at least 95% by weight of l-chloro-2,2-difluoroethane; a content of 1,1-dichloroethylene less than 2% by weight, preferably less than 1% by weight, preferably less than 0.5% by weight, more preferably less than lOOOppm, in particular less than 500 ppm, more preferably less 100 ppm, less than 50 ppm preferred manner, more preferred manner less than 10 ppm, even more preferred less than 1 ppm; and optionally less than 5% by weight, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight, in particular less than 1% by weight, more preferably less than 1000 ppm at least one additional compound selected from the group consisting of 1,1-difluoroethylene, 1,1,1-trifluoroethane, chlorotrifluoroethylene, 1-chloro-l-fluoroethylene, 1,1-difluoroethane, trans-l-chloro-2 -fluoroethylene, 1,1,2-trifluoroethane, l-chloro-2,2,2-trifluoroethane, l-chloro-1,2,2-trifluoroethane, cis-l-chloro-2-fluoroethylene, 2,2-dichloro -l, l, l-trifluoroethane, 1,1-dichloro-1-fluoroethane, 1,2-dichloro-l-fluoroethylene, l, l-dichloro-2-fluoroethylene, l, 2-dichloro-l, l-difluoroethane , trans-l, 2-dichloroethylene, l, l-dichloro-2,2-difluoroethane, cis-1,2-dichloroethylene, l, 2,2-trichloro-l, l-difluoroethane, 1,2-dichloro- -fluoroethane, 1,1,1-trichloroethane, 1,1-dichloroethane, 1,1,2-trichloro-l-fluroethane, trichlorethylene, 1,1,2-t richloro-2-fluoroethane, 1,1,2-trichloroethane, 1,1,2,2-tetrachloro-l-fluoroethane, tetrachlorethylene, 1,1,1,2-tetrachloroethane, 1,1,2,2-tetrachloroethane, 1,1,1,2,2-pentachloroethane, tetrachloromethane, 1,2,2-trichloro-l-fluoroethylene, isomers of chloropropene, 1,2-dichloro-l-fluoroethylene, l-chloro-2-fluoroethane, 1 -chloro-l-fluoroethane, l, l-chloro-2,2,2-trifluoroethane, l, l, l-trichloro-2,2-difluoroethane, 1-chloride-, 1-fluoroethylene and H2O; based on the total weight of the composition.

Advantageously, said composition may comprise l-chloro-2,2-difluoroethane, 1,1-dichloroethylene, trans-l, 2-dichloroethylene and optionally at least one additional compound selected from the group consisting of 1,1-difluoroethylene, 1, 1,1-trifluoroethane, chlorotrifluoroethylene, 1-chloro-l-fluoroethylene, 1,1-difluoroethane, trans-l-chloro-2-fluoroethylene, 1,1,2-trifluoroethane, l-chloro-2,2,2 trifluoroethane, l-chloro-1,2,2-trifluoroethane, cis-l-chloro-2-fluoroethylene, 2,2-dichloro-l, l, l-trifluoroethane, 1,1-dichloro-1-fluoroethane, l- chloro-2,2-difluoroethane, 1,2-dichloro-l-fluoroethylene, l, l-dichloro-2-fluoroethylene, l, 2-dichloro-l, l-difluoroethane, l, l-dichloro-2,2- difluoroethane, cis-1,2-dichloroethylene, l, 2,2-trichloro-l, l-difluoroethane, 1,2-dichloro-l-fluoroethane, 1,1,1-trichloroethane, 1,1-dichloroethane, 1, 1,2-trichloro-l-fluroethane, trichlorethylene, 1,1,2-trichloro-2-fluoroethane, 1,1,2-trichloroethane, 1,1,2,2-tetrachloro-l-fluoroethane, tetrachloro ethylene, 1,1,1,2-tetrachloroethane, 1,1,2,2-tetrachloroethane, 1,1,1,2,2-pentachloroethane, tetrachloromethane, 1,2,2-trichloroethane-l-fluoroethylene, isomers of chloropropene, 1,2-dichloro-l-fluoroethylene, l-chloro-2-fluoroethane, 1-chloro-l-fluoroethane, l, l-chloro-2,2,2-trifluoroethane, l, l, l-trichloro -2,2-difluoroethane, 1-chloride-, 1-fluoroethylene and H2O. Preferably said composition may comprise at least 40% by weight, preferably at least 50% by weight, preferably at least 60% by weight, in particular at least 80% by weight, more preferably at least 90% by weight, preferred at least 95% by weight of l-chloro-2,2-difluoroethane; a content of

1.1- dichloroethylene less than 2% by weight, preferably less than 1% by weight, preferably less than 0.5% by weight, more preferably less than lOOOppm, in particular less than 500 ppm, more preferably less than 100 ppm, preferred manner less than 50 ppm, more preferred manner less than 10 ppm, even more preferred less than 1 ppm; a trans-content, 2-dichloroethylene less than 30% by weight, preferably less than 20% by weight, preferably less than 15% by weight, more preferably less than 10% by weight, in particular less than 5% by weight, more particularly less than 1% by weight, less than 7500 ppm preferred manner, more preferred less than 5000 ppm; and optionally less than 5% by weight, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight, in particular less than 1% by weight, more preferably less than 1000 ppm at least one additional compound selected from the group consisting of 1,1-difluoroethylene, 1,1,1-trifluoroethane, chlorotrifluoroethylene, 1-chloro-l-fluoroethylene, 1,1-difluoroethane, trans-l-chloro-2 -fluoroethylene, 1,1,2-trifluoroethane, l-chloro-2,2,2-trifluoroethane, l-chloro-l, 2,2-trifluoroethane, cis-l-chloro-2-fluoroethylene, 2,2-dichloro -l, l, l-trifluoroethane, 1,1-dichloro-l-fluoroethane, 1,2-dichloro-l-fluoroethylene, l, l-dichloro-2-fluoroethylene, l, 2-dichloro-l, l-difluoroethane , trans-1,2-dichloroethylene, l, l-dichloro-2,2-difluoroethane, cis-l, 2-dichloroethylene, l, 2,2-trichloro-l, l-difluoroethane, 1,2-dichloro- -fluoroethane, 1,1,1-trichloroethane, 1,1-dichloroethane, 1,1,2-trichloro-l-fluroethane, trichlorethylene, l, l, 2-t richloro-2-fluoroethane, 1,1,2-trichloroethane, 1,1,2,2-tetrachloro-l-fluoroethane, tetrachlorethylene, 1,1,1,2-tetrachloroethane, 1,1,2,2-tetrachloroethane, 1,1,1,2,2-pentachloroethane, tetrachloromethane, 1,2,2-trichloro-l-fluoroethylene, isomers of chloropropene, 1,2-dichloro-l-fluoroethylene, l-chloro-2-fluoroethane, 1 -chloro-l-fluoroethane, l, l-chloro-2,2,2-trifluoroethane, l, l, l-trichloro-2,2-difluoroethane, 1-chloride-, 1-fluoroethylene and H2O; based on the total weight of the composition.

Preferably said composition may comprise at least 80% by weight of 1-chloro-2.2-difluoroethane; a content of 1,1-dichloroethylene less than 50 ppm, a content trans-l, 2-dichloroethylene less than 20% by weight and less than 500 ppm O h, preferably less than 400 ppm O h, of preferably less than 300 ppm O h, in particular less than 100 ppm O h, more preferably less than 10 ppm of O h, based on the total weight of the composition. Said composition may have a pH between 6.5 and 8.

In particular, said composition may comprise at least 95% by weight of 1-chloro-2,2-difluoroethane; a content of 1,1-dichloroethylene less than 50 ppm, a content trans-l, 2-dichloroethylene less than 5% by weight, preferably less than 3% by weight and less than 500 ppm O h, preferably less than 400 ppm O h, preferably less than 300 ppm O h, in particular less than 100 ppm O h, more preferably less than 10 ppm of O h, based on the total weight of the composition . Said composition may have a pH between 6.5 and 8.

Preferably said composition may comprise l-chloro-2,2-difluoroethane, 1,1-dichloroethylene, trans-l, 2-dichloroethylene, l-chloro-2,2,2-trifluoroethane and 1,1,2-trifluoroethane . Said composition may comprise at least 40% by weight, preferably at least 50% by weight, preferably at least 60% by weight, in particular at least 80% by weight, more preferably at least 90% by weight, in a privileged manner to least 95% by weight of l-chloro-2,2-difluoroethane; a content of 1,1-dichloroethylene less than 2% by weight, preferably less than 1% by weight, preferably less than 0.5% by weight, more preferably less than lOOOppm, in particular less than 500 ppm, more preferably less 100 ppm, less than 50 ppm preferred manner, more preferred manner less than 10 ppm, even more preferred less than 1 ppm; a trans-content, 2-dichloroethylene less than 30% by weight, preferably less than 20% by weight, preferably less than 15% by weight, more preferably less than 10% by weight, in particular less than 5% by weight, more particularly less than 1% by weight, less than 7500 ppm preferred manner, more preferred less than 5000 ppm; a content of l-chloro-l, 2,2-trifluoroethane less than 1% by weight, preferably less than 5000 ppm, preferably less than 4000 ppm, more preferably less than 3000 ppm, in particular less than 2000 ppm, more particularly less than 1,600 ppm, and a content of 1,1,2-trifluoroethane less than 5% by weight, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight, especially less than 1% by weight, more preferably less than 1000 ppm, less than 500 ppm privileged manner, more preferred way of less than 100 ppm, even more preferred less than 50 ppm based on the total weight of the composition.

Preferably said composition may comprise at least 99.5% by weight of 1-chloro-2,2-difluoroethane, less than 50 ppm of 1,1,2-trifluoroethane, less than 100 ppm of 1-chloro-2, 2,2-trifluoroethane and less than 5000 ppm of trans-l, 2-dichloroethylene and less than 50 ppm of 1,1-dichloroethylene.

Optionally, said composition may comprise at least one additional compound selected from the group consisting of 1,1-difluoroethylene, 1,1,1-trifluoroethane, chlorotrifluoroethylene, 1-chloro-l-fluoroethylene, 1,1-difluoroethane, trans- chloro-2-fluoroethylene, l-chloro-l, 2,2-trifluoroethane, cis-l-chloro-2-fluoroethylene, 2,2-dichloro-l, l, l-trifluoroethane, 1,1-dichloro-l -fluorethane, 1,2-dichloro-l-fluoroethylene, 1,1-dichloro-2-fluoroethylene, l, 2-dichloro-l, l-difluoroethane, l, l-dichloro-2,2-difluoroethane, cis-1 , 2-dichloroethylene, l, 2,2-trichloro-l, l-difluoroethane, 1,2-dichloro-l-fluoroethane, 1,1,1-trichloroethane, 1,1-dichloroethane, 1,1,2-trichloro -l-fluroethane, trichlorethylene, 1,1,2-trichloro-2-fluoroethane, 1,1,2-trichloroethane, 1,1,2,2-tetrachloro-l-fluoroethane, tetrachlorethylene, 1,1,1,2 -tetrachloroethane, 1,1,2,2-, 1,1,1,2,2-pentachloroethane, tetrachloromethane, 1,2,2-trichloroethane-l-fluoroethylene, isomers chloropropene, 1 , 2-dichloro-l-fluoroethylene, l-chloro-2-fluoroethane, 1-chloro-l-fluoroethane, l, l-chloro-2,2,2-trifluoroethane, l, l, l-trichloro-2,2 difluoroethane, 1-chloride-, 1-fluoroethylene and H2O. Preferably said composition may comprise H2O. In particular, said composition may comprise less than 500 ppm of O h, preferably less than 400 ppm O h, preferably less than 300 ppm O h, in particular less than 100 ppm O h, more particularly less than 10 ppm h O. Thus, said composition may comprise at least 99.5% by weight of l-chloro-2,2-difluoroethane, less than 50 ppm of 1,1,2-trifluoroethane, less than 100 ppm of l-chloro-2,2,2-trifluoroethane and less than 5000 ppm of trans-l, 2-dichloroethylene, less than 50 ppm of 1,1-dichloroethylene and less than 500 ppm O h, preferably less than h 400 ppm O, preferably less than 300 ppm O h, in particular less than 100 ppm O h, more preferably less than 10 ppm h O. The pH of said composition is between 6 , 5 and 8.

Preferably said composition may comprise l-chloro-2,2-difluoroethane, 1,1-dichloroethylene, trans-l, 2-dichloroethylene, l-chloro-2,2,2-trifluoroethane, 1,1,2-trifluoroethane and at least one, two, three, four, five, six, seven, eight, nine, ten, eleven, twelve, thirteen, fourteen, fifteen, sixteen, seventeen, eighteen, nineteen, twenty, twenty-one or all of the additional compounds selected from the group consisting of 1,1-difluoroethylene, 1,1,1-trifluoroethane, 1-chloro-l-fluoroethylene, 1,1-difluoroethane, trans-l-chloro- 2-fluoroethylene, l-chloro-l, 2,2-trifluoroethane, cis-l-chloro-2-fluoroethylene, 1,2-dichloro-l-fluoroethylene, l, 2-dichloro-l, l-difluoroethane, l, l-dichloro-2,2-difluoroethane, cis-1,2-dichloroethylene, 1,2-dichloro-l-fluoroethane, 1,1,2-trichloro-l-fluroethane, trichlorethylene, l, l, 2-trichloro 2-fluoroethane, 1,1,2-trichloroethane, 1,1,2,2-tetrachloro-l-fluoroethane,

tetrachlorethylene, 1,1,2,2-, tetrachloromethane, 1,2,2-trichloroethane-l-fluoroethylene, isomers of chloropropene and H2O.

In particular, said composition may comprise:

• at least 40% by weight, preferably at least 50% by weight, preferably at least 60% by weight of l-chloro-2,2-difluoroethane;

• a content of 1,1-dichloroethylene less than 2% by weight based on the total weight of the composition, preferably less than 1% by weight, preferably less than 0.5% by weight, more preferably less than lOOOppm, in especially less than 500 ppm, more preferably less than 100 ppm, less than 50 ppm preferred manner, more preferred manner less than 10 ppm, even more preferred less than 1 ppm;

• a content of trans-l, 2-dichloroethylene in said composition may be less than 30% by weight based on the total weight of the composition, preferably less than 20% by weight, preferably less than 15% by weight, more preferably less than 10% by weight;

• a content of l-chloro-2,2,2-trifluoroethane in said composition is less than 5% by weight based on the total weight of the composition, preferably less than 4 wt%, preferably less than 3% by weight, more preferably less than 2% by weight, in particular less than 1% by weight; · A 1,1,2-trifluoroethane content in said composition is less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight, in particular less than 1% by weight; and

• at least one, two, three, four, five, six, seven, eight, nine, ten, eleven, twelve, thirteen, fourteen, fifteen, sixteen, seventeen, eighteen, nineteen, twenty, twenty -a or all of the additional compounds selected (s) from the group consisting of:

o 1,1-difluoroethylene in a content of less than 1% by weight based on the total weight of the composition, preferably less than 0.5% by weight, preferably less than 1000 ppm, more preferably less than 500ppm, especially less 250 ppm, more preferably less than 200 ppm, less than 50 ppm preferred manner, more preferred manner less than 10 ppm, even more preferred less than 1 ppm,

o 1,1,1-trifluoroethane in a content of less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 2% by weight, more preferably less than 1% by weight, in particular less than 250 ppm, more preferably less than 200 ppm, less than 50 ppm preferred manner, more preferred manner less than 10 ppm, even more preferred less than 1 ppm,

o 1-chloro-l-fluoroethylene in an amount less than 1% by weight based on the total weight of the composition, preferably less than 5000 ppm, preferably less than 2500 ppm, more preferably less than 1000 ppm,

o 1,1-difluoroethane in a content of less than 1% by weight based on the total weight of the composition, preferably less than 5000 ppm, preferably less than 2500 ppm, more preferably less than 1000 ppm, in particular less than 500 ppm , more preferably less than 300 ppm o trans-l-chloro-2-fluoroethylene in an amount less than 2% by weight based on the total weight of the composition, preferably less than 1% by weight, preferably less than 8000 ppm , more preferably less than 5000 ppm, in particular less than 4000 ppm, more preferably less than 3000 ppm,

o l-chloro-l, 2,2-trifluoroethane in a content of less than 1% by weight based on the total weight of the composition, preferably less than 5000 ppm, preferably less than 4000 ppm, more preferably less than 3000 ppm, in particular less than 2000 ppm, more preferably less than 1600 ppm,

o cis-l-chloro-2-fluoroethylene in an amount less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2 % by weight, in particular less than 1% by weight, more preferably less than 8000 ppm,

o 1,2-dichloro-l-fluoroethylene in an amount less than 1% by weight based on the total weight of the composition, preferably less than 5000 ppm, preferably less than 4000 ppm, more preferably less than 3000

ppm, in particular less than 2000 ppm, more preferably less than 1000 ppm,

ol, 2-dichloro-l, l-difluoroethane in a content of less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight, in particular less than 1% by weight, more preferably less than 5000 ppm, less than 2500 ppm preferred manner,

ol, l-dichloro-2,2-difluoroethane in a content of less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight, in particular less than 1% by weight,

o cis-l, 2-dichloroethylene in a content of less than 40% by weight based on the total weight of the composition, preferably less than 30% by weight, preferably less than 20% by weight, more preferably less than 15% by weight, in particular less than 10% by weight, more particularly less than 5% by weight,

o 1,2-dichloro-l-fluoroethane in an amount less than 10% by weight based on the total weight of said composition, preferably less than 9 wt%, preferably less than 8% by weight, more preferably less than 7 % by weight, in particular less than 6% by weight, more particularly less than 5% by weight, preferred manner less than 4% by weight, o-trichloro-1,1,2-fluroethane in a content of less than 2 % by weight based on the total weight of the composition, preferably less than 1% by weight, preferably less than 5000 ppm, more preferably less than 2500 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm preferred,

o Trichlorethylene in a less than 3% content by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 10,000 ppm, more preferably less than 7500 ppm, in particular less than 5000 ppm, more preferably less than 3500 ppm,

l, l, 2-trichloro-2-fluoroethane in an amount less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight, in particular less than 1% by weight,

1,1,2-trichloroethane in a content of less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight , in particular less than 1% by weight,

1,1,2,2-tetrachloro-l-fluoroethane in an amount less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner,

Tetrachlorethylene in a content of less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 1000 ppm, more particularly less than 500 ppm, preferred manner of less than 100 ppm,

1,1,2,2-tetrachloroethane in a content of less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm , in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner,

Tetrachloromethane in a content of less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 1000 ppm, more particularly less than 500 ppm, less than 100 ppm privileged manner, more preferred manner less than 50 ppm,

1,2,2-trichloro-l-fluoroethylene in an amount less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably

less than 5000 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner, more preferred manner less than 50 ppm,

o isomers of chloropropene in a content of less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than to 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner, more preferred manner less than 50 ppm; and

o less than 500 ppm, preferably less than 400 ppm, preferably less than 300 ppm, in particular less than 100 ppm O h, more preferably less than 10 ppm of O h;

based on the total weight of the composition.

As indicated above, the HCl content in any of the compositions described above may be such that the pH thereof is between 6 and 9, preferably between 6.5 and 8.5, preferably between 6.5 and 8.0, more preferably between 7.0 and 8.0.

According to a second aspect of the present invention, a composition comprising 1-chloro-2,2-difluoroethane and trans-l, 2-dichloroethylene is provided.

Preferably, said composition comprises at least 40% by weight of l-chloro-2,2-difluoroethane, preferably at least 50% by weight, preferably at least 60% by weight; and a content by weight of trans-l, 2-dichloroethylene is less than 25%, preferably less than 20% by weight, preferably less than 15% by weight, more preferably less than 10% by weight, in particular less than 5 % by weight, more preferably less than 3% by weight, preferred manner of less than 10,000 ppm, more preferred manner of less than 5000 ppm based on the total weight of the composition.

Preferably, said composition comprises l-chloro-2,2-difluoroethane, trans-1,2-dichloroethylene and at least one additional compound selected from the group consisting of 1,1-difluoroethylene, 1,1,1-trifluoroethane, chlorotrifluoroethylene , 1-chloro-l-fluoroethylene, 1,1-difluoroethane, trans-l-chloro-2-fluoroethylene, l-chloro-2,2,2-trifluoroethane, l-chloro-l, 2,2-trifluoroethane, cis -l-chloro-2-fluoroethylene, 1,1,2-trifluoroethane, 1,2-dichloro-l-fluoroethane, 2,2-dichloro-l, l, l-trifluoroethane, 1,1-dichloro-l-fluoroethane , 1,1-dichloroethylene, 1,2-dichloro-l-fluoroethylene, l, l-dichloro-2-fluoroethylene, l, 2-dichloro-l, l-difluoroethane, l, l-dichloro-2,2-difluoroethane , cis-1,2

dichloroethylene, l, 2,2-trichloro-l, l-difluoroethane, 1,1,1-trichloroethane, 1,1-dichloroethane, 1,1,2-trichloro-l-fluroethane, trichlorethylene, l, l, 2- trichloro-2-fluoroethane, 1,1,2-trichloroethane, 1,1,2,2-tetrachloro-l-fluoroethane, tetrachlorethylene, 1,1,1,2-tetrachloroethane, 1,1,2,2-tetrachloroethane, 1,1,1,2,2-pentachloroethane, tetrachloromethane, 1,2,2-trichloro-l-fluoroethylene, isomers of chloropropene, 1-chloro-2-fluoroethane, 1-chloro-l-fluoroethane, l, l chloro-2,2,2-trifluoroethane, l, l, l-trichloro-2,2-difluoroethane, 1-chloride-, 1-fluoroethylene, H2O and HCl; said composition comprising at least 30% by weight of l-chloro-2,2-difluoroethane based on the total weight of the composition.

Preferably, said composition comprises at least 40% by weight of l-chloro-2,2-difluoroethane, preferably at least 50% by weight, preferably at least 60% by weight; and a content by weight of trans-l, 2-dichloroethylene is less than 25%, preferably less than 20% by weight, preferably less than 15% by weight, more preferably less than 10% by weight, in particular less than 5 % by weight, more preferably less than 3% by weight, less than 10000 ppm privileged manner, more preferred less than 5000 ppm; and less than 35 wt% of said at least one additional compound, preferably less than 30% by weight, preferably less than 10% by weight of said at least one additional compound, more preferably less than 15% by weight of said at least one compound additional, particularly less than 5% by weight of said at least one additional compound, more particularly less than 1% by weight of said at least one additional compound based on the total weight of the composition.

In particular, said composition comprising l-chloro-2,2-difluoroethane, trans-1,2-dichloroethylene, cis-l, 2-dichloroethylene and l-chloro-2,2,2-trifluoroethane.

Preferably, the content by weight of cis-l, 2-dichloroethylene is less than 35% based on the total weight of the composition, preferably less than 30% by weight, preferably less than 20% by weight, more preferably less than 15% by weight, in particular less than 5% by weight, more particularly less than 1% by weight, less than 4000 ppm privileged manner.

Preferably, the weight content of l-chloro-2,2-difluoroethane is less than 10% based on the total weight of the composition, preferably less than 5% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 2000 ppm.

Thus, said composition may comprise at least 40% by weight of l-chloro-2,2-difluoroethane, preferably at least 50% by weight, preferably at least 60% by

weight; and a content by weight of trans-l, 2-dichloroethylene is less than 25%, preferably less than 20% by weight, preferably less than 15% by weight, more preferably less than 10% by weight, in particular less than 5 % by weight, more preferably less than 3% by weight, less than 10000 ppm privileged manner, more preferred less than 5000 ppm; a content by weight of cis-l, 2-dichloroethylene is less than 35%, preferably less than 30% by weight, preferably less than 20% by weight, more preferably less than 15% by weight, in particular less than 5% by weight, more particularly less than 1% by weight, less than 4000 ppm preferred manner; and a weight content of l-chloro-2,2-difluoroethane is less than 10%, preferably less than 5% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 2000 ppm based on the total weight of the composition.

Preferably, said composition may thus comprise at least one additional compound selected from the group consisting of 1,1-difluoroethylene, 1,1,1-trifluoroethane, chlorotrifluoroethylene, 1-chloro-l-fluoroethylene, 1,1-difluoroethane, trans -l-chloro-2-fluoroethylene, 1,1,2-trifluoroethane, l-chloro-l, 2,2-trifluoroethane, cis-l-chloro-2-fluoroethylene, 2,2-dichloro-l, l, l -trifluoroethane, 1,1-dichloro-l-fluoroethane, 1,1-dichloroethylene, 1,2-dichloro-l-fluoroethylene, l, l-dichloro-2-fluoroethylene, 1,2-dichloro-1,1-difluoroethane , l, l-dichloro-2,2-difluoroethane, l, 2,2-trichloro-l, l-difluoroethane, 1,2-dichloro-l-fluoroethane, 1,1,1-trichloroethane, 1,1-dichloroethane , 1,1,2-trichloro-l-fluroethane, trichlorethylene, l, l, 2-trichloro-2-fluoroethane, 1,1,2-trichloroethane, 1,1,2,2-tetrachloro-l-fluoroethane, Tetrachlorethylene , 1,1,1,2-tetrachloroethane, 1,1,2,2-tetrachloroethane, 1,1,1,2,2-pentachloroethane, tetrachloromethane, 1,2,2-trichloroethane-l-fluoroethylene, is the omères of chloropropene, 1,2-dichloro-l-fluoroethylene, l-chloro-2-fluoroethane, 1-chloro-l-fluoroethane, l, l-chloro-2,2,2-trifluoroethane, l, l, l- trichloro-2,2-difluoroethane, 1-chloride-, 1-fluoroethylene, H2O and HCl. In particular, said at least one additional compound may be selected from the group consisting of 1,1-difluoroethylene, 1,1,1-trifluoroethane, 1-chloro-l-fluoroethylene, 1,1-difluoroethane, trans-l-chloro -2-fluoroethylene, 1,1,2-trifluoroethane, l-chloro-l, 2,2-trifluoroethane, cis-l-chloro-2-fluoroethylene, 2,2-dichloro-l, l, l-trifluoroethane, 1 , 2-dichloro-l-fluoroethylene, 1,2-dichloro-1,1-difluoroethane, l, l-dichloro-2,2-difluoroethane, 1,2-dichloro-l-fluoroethane, 1,1,2-trichloro -l-fluroethane, trichlorethylene, l, l, 2-trichloro-2-fluoroethane, 1,1,2-trichloroethane, 1,1,2,2-tetrachloro-l-fluoroethane, tetrachlorethylene 1,1,2,2 -

tetrachloroethane 1,1,1,2,2-pentachloroethane, tetrachloromethane, 1,2,2-trichloroethane-l-fluoroethylene, isomers of chloropropene and H2O.

Thus, said composition may comprise l-chloro-2,2-difluoroethane, trans-1,2-dichloroethylene, cis-l, 2-dichloroethylene, l-chloro-2,2,2-trifluoroethane and at least one additional compound selected from the group consisting of 1,1-difluoroethylene, 1,1,1-trifluoroethane, chlorotrifluoroethylene, 1-chloro-l-fluoroethylene, 1,1-difluoroethane, trans-l-chloro-2-fluoroethylene, 1,1,2 -trifluoroethane, l-chloro-l, 2,2-trifluoroethane, cis-l-chloro-2-fluoroethylene, 2,2-dichloro-l, l, l-trifluoroethane, 1,1-dichloro-l-fluoroethane, 1 , 1-dichloroethylene, 1,2-dichloro-l-fluoroethylene, l, l-dichloro-2-fluoroethylene, 1,2-dichloro-1,1-difluoroethane, l, l-dichloro-2,2-difluoroethane, l , 2,2-trichloro-l, l-difluoroethane, 1,2-dichloro-l-fluoroethane, 1,1,1-trichloroethane, 1,1-dichloroethane, 1,1,2-trichloro-l-fluroethane, trichlorethylene , l, l, 2-trichloro-2-fluoroethane, 1,1,2-trichloroethane, 1,1,2,2-tetrachloro-l-fluoroethane, tetrachlorethylene 1,1,1,2-tetrachloroethane, 1.1 , 2,2-tetrac hloroethane, 1,1,1,2,2-pentachloroethane, tetrachloromethane, 1,2,2-trichloro-l-fluoroethylene, isomers of chloropropene, 1,2-dichloro-l-fluoroethylene, l-chloro-2-fluoroethane , 1-chloro-l-fluoroethane, l, l-chloro-2,2,2-trifluoroethane, l, l, l-trichloro-2,2-difluoroethane, 1-chloride-, 1-fluoroethylene, H2O and HCl.

Said composition may comprise at least 40% by weight of l-chloro-2,2-difluoroethane, preferably at least 50% by weight, preferably at least 60% by weight; and a content by weight of trans-l, 2-dichloroethylene is less than 25%, preferably less than 20% by weight, preferably less than 15% by weight, more preferably less than 10% by weight, in particular less than 5 % by weight, more preferably less than 3% by weight, less than 10000 ppm privileged manner, more preferred less than 5000 ppm; a content by weight of cis-l, 2-dichloroethylene is less than 35%, preferably less than 30% by weight, preferably less than 20% by weight, more preferably less than 15% by weight, in particular less than 5% by weight, more particularly less than 1% by weight, less than 4000 ppm preferred manner; and a weight content of l-chloro-2,2-difluoroethane is less than 10%, preferably less than 5% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 2000 ppm; and less than 5% by weight, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight, in particular less than 1% by weight, more preferably less than 1000 ppm of said at least one additional compound selected from

le groupe consistant en 1,1-difluoroethylene, 1,1,1-trifluoroethane, chlorotrifluoroethylene, 1-chloro-l-fluoroethylene, 1,1-difluoroethane, trans-l-chloro-2-fluoroethylene, 1,1,2-trifluoroethane, l-chloro-l,2,2-trifluoroethane, cis-l-chloro-2-fluoroethylene, 2,2-dichloro-1,1,1-trifluoroethane, 1,1-dichloro-l-fluorethane, 1,1-dichloroethylene, 1,2-dichloro-l-fluoroethylene, l,l-dichloro-2-fluoroethylene, l,2-dichloro-l,l-difluoroethane, 1,1-dichloro-2,2-difluorethane, l,2,2-trichloro-l,l-difluoroethane, 1,2-dichloro-l-fluoroethane, 1,1,1-trichloroethane, 1,1-dichloroethane, 1,1,2-trichloro-l-fluroethane, trichloroethylène, 1,1,2-trichloro-2-fluoroethane, 1,1,2-trichloroethane, 1,1,2,2-tetrachloro-l-fluoroethane, tetrachloroethylène, 1,1,1,2-tetrachloroethane, 1,1,2,2-tetrachloroethane, 1,1,1,2,2-pentachloroethane, tetrachlorométhane, 1,2,2-trichloro-l-fluoroethylene, les isomères du chloropropène, 1,2-dichloro-l-fluoroethylene, l-chloro-2-fluoroethane, 1-chloro-l-fluoroethane, l,l-chloro-2,2,2-trifluoroethane, l,l,l-trichloro-2,2-difluoroethane, 1-chloroethylene, 1-fluoroethylene, H2O et HCI ; sur base du poids total de la composition.

According to a particular embodiment, said composition may comprise 1-chloro-2,2-difluoroethane, trans-l, 2-dichloroethylene, cis-l, 2-dichloroethylene, l-chloro-2,2,2-trifluoroethane and least one additional compound selected from the group consisting of 1,1-difluoroethylene, 1,1,1-trifluoroethane, 1-chloro-l-fluoroethylene, 1,1-difluoroethane, trans-l-chloro-2-fluoroethylene, 1, 1,2-trifluoroethane, l-chloro-l, 2,2-trifluoroethane, cis-1-chloro-2-fluoroethylene, 1,1-dichloroethylene, 1,2-dichloro-l-fluoroethylene, l, 2-dichloro- l, l-difluoroethane, l, l-dichloro-2,2-difluoroethane, 1,2-dichloro-l-fluoroethane, 1,1,2-trichloro-l-fluroethane, trichlorethylene, l, l, 2-trichloro 2-fluoroethane, 1,1,2-trichloroethane, 1,1,2,2-tetrachloro-l-fluoroethane, tetrachlorethylene 1,1,2,2-, 1,1,1,2,2-pentachloroethane, tetrachloromethane, 1,2,2-trichloroethane-l-fluoroethylene, chloropropene isomers and optionally H2O.

Thus, said composition may comprise at least 40% by weight of l-chloro-2,2-difluoroethane, preferably at least 50% by weight, preferably at least 60% by weight; and a content by weight of trans-l, 2-dichloroethylene is less than 25%, preferably less than 20% by weight, preferably less than 15% by weight, more preferably less than 10% by weight, in particular less than 5 % by weight, more preferably less than 3% by weight, less than 10000 ppm privileged manner, more preferred less than 5000 ppm; a content by weight of cis-l, 2-dichloroethylene is less than 35%, preferably less than 30% by weight, preferably less than 20% by weight, more preferably less than 15% by weight, in particular less than 5% by weight, more particularly less than 1% by weight, less than 4000 ppm preferred manner; and a weight content of l-chloro-2,2-difluoroethane is less than 10%, preferably less than 5% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 2000 ppm; and less than 5% by weight, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight, in particular less than 1% by weight, more preferably less than 1000 ppm of said at least one additional compound selected from the group consisting of 1,1-difluoroethylene, 1,1,1-trifluoroethane, 1-chloro-l-fluoroethylene,

1.1- difluoroethane, trans-l-chloro-2-fluoroethylene, 1,1,2-trifluoroethane, l-chloro-1,2,2-trifluoroethane, cis-l-chloro-2-fluoroethylene, 1,1-dichloroethylene, 1,2-dichloro-l-fluoroethylene, l, 2-dichloro-l, l-difluoroethane, l, l-dichloro-2,2-difluoroethane, 1,2-dichloro-l-fluoroethane, 1,1,2 trichloro-l-fluoroethane, trichlorethylene, l, l, 2-trichloro-2-fluoroethane, 1,1,2-trichloroethane, 1,1,2,2-tetrachloro-l-fluoroethane, tetrachlorethylene 1,1,2, 2-tetrachloroethane, 1,1,1,2,2-pentachloroethane, tetrachloromethane, 1,2,2-trichloroethane-l-fluoroethylene, chloropropene isomers and optionally H2O. More preferably, said composition may comprise at least 40% by weight of 1-chloro-2.2-difluoroethane, preferably at least 50% by weight, preferably at least 60% by weight; and a content by weight of trans-l, 2-dichloroethylene is less than 25%, preferably less than 20% by weight, preferably less than 15% by weight, more preferably less than 10% by weight, in particular less than 5 % by weight, more preferably less than 3% by weight, less than 10000 ppm privileged manner, more preferred less than 5000 ppm; a content by weight of cis-l, 2-dichloroethylene is less than 35%, preferably less than 30% by weight, preferably less than 20% by weight, more preferably less than 15% by weight, in particular less than 5% by weight, more particularly less than 1% by weight, less than 4000 ppm preferred manner; and a weight content of l-chloro-2,2-difluoroethane is less than 10%, preferably less than 5% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 2000 ppm; and less than 5% by weight, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight, in particular less than 1% by weight, more preferably less than 1000 ppm of said at least one, two, three, four, five, six, seven, eight, nine, ten, eleven, twelve, thirteen, fourteen, fifteen, sixteen, seventeen, eighteen, nineteen, twenty, twenty a twenty-two or all selected additional compound (s) from the group

consistant en 1,1-difluoroethylene, 1,1,1-trifluoroethane, 1-chloro-l-fluoroethylene, 1,1-difluoroethane, trans-l-chloro-2-fluoroethylene, 1,1,2-trifluoroethane, l-chloro-1,2,2-trifluoroethane, cis-l-chloro-2-fluoroethylene, 1,1-dichloroethylene, 1,2-dichloro-l-fluoroethylene, l,2-dichloro-l,l-difluoroethane, l,l-dichloro-2,2-difluorethane, 1,2-dichloro-l-fluoroethane, 1,1,2-trichloro-l-fluoroethane, trichloroéthylène, l,l,2-trichloro-2-fluoroethane, 1,1,2-trichloroethane, 1,1,2,2-tetrachloro-l-fluoroethane, tetrachloroethylène, 1,1,2,2-tetrachloroethane, 1,1,1,2,2-pentachloroethane, tetrachlorométhane, 1,2,2-trichloro-l-fluoroethylene, les isomères du chloropropène et optionnellement H2O.

Thus, said composition may comprise:

· At least 40% by weight of l-chloro-2,2-difluoroethane, preferably at least 50% by weight, preferably at least 60% by weight;

• a content by weight of trans-l, 2-dichloroethylene is less than 25%, preferably less than 20% by weight, preferably less than 15% by weight, more preferably less than 10% by weight, in particular less than 5 % by weight, more preferably less than 3% by weight, less than 10000 ppm privileged manner, more preferred less than 5000 ppm;

• a content by weight of cis-l, 2-dichloroethylene is less than 35%, preferably less than 30% by weight, preferably less than 20% by weight, more preferably less than 15% by weight, in particular less than 5 % by weight, more particularly less than 1% by weight, less than 4000 ppm preferred manner;

• a weight content of l-chloro-2,2-difluoroethane is less than 10%, preferably less than 5% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 2000 ppm;

· At least one, two, three, four, five, six, seven, eight, nine, ten, eleven, twelve, thirteen, fourteen, fifteen, sixteen, seventeen, eighteen, nineteen, twenty, twenty -a twenty-two or all of the additional compounds selected (s) from the group consisting of o 1,1-difluoroethylene in a content of less than 1% by weight based on the total weight of the composition, preferably less than 0 , 5% by weight, preferably less than 1000 ppm, more preferably less than 500ppm, especially less than 250 ppm, more preferably less than 200 ppm, less than 50 ppm preferred manner, more preferred manner less than 10 ppm, even more preferably of less than 1 ppm,

1.1.1-trifluoroethane in a content of less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 2% by weight, more preferably less than 1% by weight, especially less than 250 ppm, more preferably less than 200 ppm, less than 50 ppm preferred manner, more preferred manner less than 10 ppm, even more preferred less than 1 ppm,

1-chloro-l-fluoroethylene in an amount less than 1% by weight based on the total weight of the composition, preferably less than 5000 ppm, preferably less than 2500 ppm, more preferably less than 1000 ppm,

1,1-difluoroethane in a less than 1% content by weight based on the total weight of the composition, preferably less than 5000 ppm, preferably less than 2500 ppm, more preferably less than 1000 ppm, in particular less than 500 ppm, more particularly less than 300 ppm, trans-l-chloro-2-fluoroethylene in an amount less than 2% by weight based on the total weight of the composition, preferably less than 1% by weight, preferably less than 8000 ppm, more preferably less than 5000 ppm, in particular less than 4000 ppm, more preferably less than 3000 ppm,

1.1.2- trifluoroethane in a content of less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight, especially less than 1% by weight, more preferably less than 1000 ppm, less than 500 ppm privileged manner, more preferred way of less than 100 ppm, even more preferred less than 50 ppm,

l-chloro-l, 2,2-trifluoroethane in a less than 1% content by weight based on the total weight of the composition, preferably less than 5000 ppm, preferably less than 4000 ppm, more preferably less than 3000 ppm, especially less than 2000 ppm, more preferably less than 1600 ppm,

o cis-l-chloro-2-fluoroethylene in an amount less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2 % by weight, in particular less than 1% by weight, more preferably less than 8000 ppm,

o 1,1-dichloroethylene in a content of less than 2% by weight based on the total weight of the composition, preferably less than 1% by weight, preferably less than 0.5% by weight, more preferably less than lOOOppm, in especially less than 500 ppm, more preferably less than 100 ppm, less than 50 ppm preferred manner, more preferred manner less than 10 ppm, even more preferred less than 1 ppm,

o 1,2-dichloro-l-fluoroethylene in an amount less than 1% by weight based on the total weight of the composition, preferably less than 5000 ppm, preferably less than 4000 ppm, more preferably less than 3000 ppm, in particular less than 2000 ppm, more preferably less than 1000 ppm,

ol, 2-dichloro-l, l-difluoroethane in a content of less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight, in particular less than 1% by weight, more preferably less than 5000 ppm, less than 2500 ppm preferred manner,

ol, l-dichloro-2,2-difluoroethane in a content of less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight, in particular less than 1% by weight,

o 1,2-dichloro-l-fluoroethane in an amount less than 10% by weight based on the total weight of said composition, preferably less than 9 wt%, preferably less than 8% by weight, more preferably less than 7 % by weight, in particular less than 6% by weight, more particularly less than 5% by weight, preferred manner less than 4% by weight,

1,1,2-trichloro-l-fluroethane in a content of less than 2% by weight based on the total weight of the composition, preferably less than 1% by weight, preferably less than 5000 ppm, more preferably less than 2500 ppm , in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner,

Trichlorethylene in a content of less than 3% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 10,000 ppm, more preferably less than 7500 ppm, in particular less than 5000 ppm, more particularly less than 3500 ppm,

l, l, 2-trichloro-2-fluoroethane in an amount less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight, in particular less than 1% by weight,

1,1,2-trichloroethane in a content of less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight , in particular less than 1% by weight,

1,1,2,2-tetrachloro-l-fluoroethane in an amount less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner,

Tetrachlorethylene in a content of less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 1000 ppm, more particularly less than 500 ppm, preferred manner of less than 100 ppm,

1,1,2,2-tetrachloroethane in a content of less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm , in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner,

o 1,1,1,2,2-pentachloroethane in a content of less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less to 5000 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner, more preferred manner less than 50 ppm,

o tetrachloromethane in a content of less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 1000 ppm , more preferably less than 500 ppm, less than 100 ppm privileged manner, more preferred manner less than 50 ppm,

o 1,2,2-trichloro-l-fluoroethylene in an amount less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less to 5000 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner, more preferred manner less than 50 ppm,

o isomers of chloropropene in a content of less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than to 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner, more preferred manner less than 50 ppm; and

o optionally less than 500 ppm, preferably less than 400 ppm, preferably less than 300 ppm, in particular less than 100 ppm O h, more preferably less than 10 ppm of O h;

based on the total weight of the composition.

According to another particular embodiment, said composition may comprise 1-chloro-2,2-difluoroethane, trans-l, 2-dichloroethylene, cis-l, 2-dichloroethylene, l-chloro-2,2,2-trifluoroethane and at least one additional compound selected from the group consisting of 1,1-difluoroethylene, 1,1,1-trifluoroethane, chlorotrifluoroethylene, 1-chloro-l-fluoroethylene, 1,1-difluoroethane, trans-l-chloro-2-fluoroethylene , 1,1,2-trifluoroethane, l-chloro-1,2,2-trifluoroethane, cis-l-chloro-2-fluoroethylene, 2,2-dichloro-l, l, l-trifluoroethane, 1,1-dichloroethylene , l, 2-dichloro-l, l-difluoroethane, l, l-dichloro-2,2-difluoroethane, 1,2,2-trichloro-l, l-difluoroethane, 1,2-dichloro-l-fluoroethane, 1 , 1,2-trichloro-l-fluroethane, trichlorethylene, l, l, 2-trichloro-2-fluoroethane, 1,1,2-trichloroethane, 1,1,2,2-tetrachloro-l-fluoroethane, tetrachlorethylene, and 1 , 1,2,2-tetrachloroethane. Advantageously, said composition may comprise at least 40% by weight of l-chloro-2,2-difluoroethane, preferably at least 50% by weight, preferably at least 60% by weight; and a content by weight of trans-l, 2-dichloroethylene is less than 25%, preferably less than 20% by weight, preferably less than 15% by weight, more preferably less than 10% by weight, in particular less than 5 % by weight, more preferably less than 3% by weight, less than 10000 ppm privileged manner, more preferred less than 5000 ppm; a content by weight of cis-l, 2-dichloroethylene is less than 35%, preferably less than 30% by weight, preferably less than 20% by weight, more preferably less than 15% by weight, in particular less than 5% by weight, more particularly less than 1% by weight, less than 4000 ppm preferred manner; and a weight content of l-chloro-2,2-difluoroethane is less than 10%, preferably less than 5% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 2000 ppm; and less than 5% by weight, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight, in particular less than 1% by weight, more preferably less than 1000 ppm of said at least one additional compound selected from the group consisting of 1,1-difluoroethylene, 1,1,1-trifluoroethane, chlorotrifluoroethylene, 1-chloro-l-fluoroethylene, 1,1-difluoroethane, trans-l-chloro-2-fluoroethylene , 1,1,2-trifluoroethane, l-chloro-l, 2,2-trifluoroethane, cis-l-chloro-2-fluoroethylene, 2,2-dichloro-l, l, l-trifluoroethane, 1,1-dichloroethylene , l, 2-dichloro-l, l-difluoroethane, l, l-dichloro-2,2-difluoroethane, l, 2,2-trichloro-l, l-difluoroethane, 1,2-dichloro-l-fluoroethane, 1 , 1,2-trichloro-l-fluroethane, trichlorethylene, l, l, 2-trichloro-2-fluoroethane, 1,1,2-trichloroethane, 1,1,2,2-tetrachloro-l-fluoroethane, tetrachlorethylene, and 1 , 1,2,2-tetrachloroethane. Preferably said composition may comprise l-chloro-2,2

difluoroethane, trans-l, 2-dichloroethylene, cis-l, 2-dichloroethylene, l-chloro-2,2,2-trifluoroethane and at least one, two, three, four, five, six, seven, eight, nine, ten, eleven, twelve, thirteen, fourteen, fifteen, sixteen, seventeen, eighteen, nineteen, twenty, twenty to one or all of the selected additional compound (s) from the group consisting of 1.1 -difluoroethylene, 1,1,1-trifluoroethane, chlorotrifluoroethylene, 1-chloro-l-fluoroethylene, 1,1-difluoroethane, trans-l-chloro-2-fluoroethylene, 1,1,2-trifluoroethane, l-chloro-l , 2,2-trifluoroethane, cis-l-chloro-2-fluoroethylene, 2,2-dichloro-l, l, l-trifluoroethane, 1,1-dichloroethylene, l, 2-dichloro-l, l-difluoroethane, l , l-dichloro-2,2-difluoroethane, l, 2,2-trichloro-l, l-difluoroethane, 1,2-dichloro-l-fluoroethane, 1,1,2-trichloro-l-fluroethane, trichlorethylene, l , l, 2-trichloro-2-fluoroethane, 1,1,2-trichloroethane, 1,1,2,2-tetrachloro-l-fluoroethane, 1,1,2,2-tetrachlorethylene, and. More preferably, said composition may comprise at least 40% by weight of l-chloro-2,2-difluoroethane, preferably at least 50% by weight, preferably at least 60% by weight; and a content by weight of trans-l, 2-dichloroethylene is less than 25%, preferably less than 20% by weight, preferably less than 15% by weight, more preferably less than 10% by weight, in particular less than 5 % by weight, more preferably less than 3% by weight, less than 10000 ppm privileged manner, more preferred less than 5000 ppm; a content by weight of cis-1,2-dichloroethylene is less than 35%, preferably less than 30% by weight, preferably less than 20% by weight, more preferably less than 15% by weight, in particular less than 5% by weight, more particularly less than 1% by weight, less than 4000 ppm preferred manner; and a weight content of l-chloro-2,2-difluoroethane is less than 10%, preferably less than 5% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 2000 ppm; and less than 5% by weight, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight, in particular less than 1% by weight, more preferably less than 1000 ppm of said at least one, two, three, four, five, six, seven, eight, nine, ten, eleven, twelve, thirteen, fourteen, fifteen, sixteen, seventeen, eighteen, nineteen, twenty, twenty one or all of the selected additional compound (s) from the group consisting of 1,1-difluoroethylene, 1,1,1-trifluoroethane, chlorotrifluoroethylene, 1-chloro-l-fluoroethylene, 1,1-difluoroethane, trans- chloro-2-fluoroethylene, 1,1,2-trifluoroethane, l-chloro-1,2,2-trifluoroethane, cis-l-chloro-2-fluoroethylene, 2,2-dichloro-l, l, l-trifluoroethane , 1,1-dichloroethylene, l, 2-dichloro-l, l-difluoroethane, l, l-dichloro-2,2-difluoroethane, 1,2,2-trichloro-l, l-difluoroethane, 1,2-dichloro -l-fluoroethane, 1,1,2-trichloro-l-fluroethane,

trichloroethylène, l,l,2-trichloro-2-fluoroethane, 1,1,2-trichloroethane, 1,1,2,2-tetrachloro-l-fluoroethane, tetrachloroethylène et 1,1,2,2-tetrachloroethane.

Thus, said composition may comprise:

• at least 40% by weight of l-chloro-2,2-difluoroethane, preferably at least 50% by weight, preferably at least 60% by weight;

• a content by weight of trans-l, 2-dichloroethylene is less than 25%, preferably less than 20% by weight, preferably less than 15% by weight, more preferably less than 10% by weight, in particular less than 5 % by weight, more preferably less than 3% by weight, less than 10000 ppm privileged manner, more preferred less than 5000 ppm;

• a content by weight of cis-l, 2-dichloroethylene is less than 35%, preferably less than 30% by weight, preferably less than 20% by weight, more preferably less than 15% by weight, in particular less than 5 % by weight, more particularly less than 1% by weight, less than 4000 ppm preferred manner;

• a weight content of l-chloro-2,2-difluoroethane is less than 10%, preferably less than 5% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 2000 ppm, and

• at least one, two, three, four, five, six, seven, eight, nine, ten, eleven, twelve, thirteen, fourteen, fifteen, sixteen, seventeen, eighteen, nineteen, twenty, twenty -a or all of the additional compounds selected (s) from the group consisting of:

o 1,1-difluoroethylene in a content of less than 1% by weight based on the total weight of the composition, preferably less than 0.5% by weight, preferably less than 1000 ppm, more preferably less than 500ppm, especially less 250 ppm, more preferably less than 200 ppm, preferred manner less than 50 ppm, more preferred manner less than 10 ppm, still more preferred manner of less than 1 ppm, o 1,1,1-trifluoroethane in a lower content to 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 2% by weight, more preferably less than 1% by weight, in particular less than 250 ppm, more preferably less 200 ppm, in a privileged manner less than 50 ppm, more

preferred less than 10 ppm, still more preferred manner of less than 1 ppm,

o chlorotrifluoroethylene in a content less than 1000 ppm, preferably less than 500 ppm, preferably less than 250 ppm, more preferably less than 100 ppm, in particular less than 50 ppm,

o 1-chloro-l-fluoroethylene in an amount less than 1% by weight based on the total weight of the composition, preferably less than 5000 ppm, preferably less than 2500 ppm, more preferably less than 1000 ppm,

o 1,1-difluoroethane in a content of less than 1% by weight based on the total weight of the composition, preferably less than 5000 ppm, preferably less than 2500 ppm, more preferably less than 1000 ppm, in particular less than 500 ppm , more preferably less than 300 ppm o trans-l-chloro-2-fluoroethylene in an amount less than 2% by weight based on the total weight of the composition, preferably less than 1% by weight, preferably less than 8000 ppm , more preferably less than 5000 ppm, in particular less than 4000 ppm, more preferably less than 3000 ppm,

o 1,1,2-trifluoroethane in a content of less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight, in particular less than 1% by weight, more preferably less than 1000 ppm, less than 500 ppm privileged manner, more preferred way of less than 100 ppm, even more preferred less than 50 ppm.

o l-chloro-l, 2,2-trifluoroethane in a content of less than 1% by weight based on the total weight of the composition, preferably less than 5000 ppm, preferably less than 4000 ppm, more preferably less than 3000 ppm, in particular less than 2000 ppm, more preferably less than

1600 ppm,

o cis-l-chloro-2-fluoroethylene in an amount less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2 % by weight, in particular less than 1% by weight, more preferably less than 8000 ppm,

o 2,2-dichloro-l, l, l-trifluoroethane in a content of less than 1% by weight based on the total weight of the composition, preferably less than 5000 ppm, preferably less than 4000 ppm, more preferably less than 3000 ppm, in particular less than 2000 ppm, more preferably less than 1000 ppm,

o 1,1-dichloroethylene in a content of less than 2% by weight based on the total weight of the composition, preferably less than 1% by weight, preferably less than 0.5% by weight, more preferably less than lOOOppm, in especially less than 500 ppm, more preferably less than 100 ppm, less than 50 ppm preferred manner, more preferred manner less than 10 ppm, even more preferred less than 1 ppm,

ol, 2-dichloro-l, l-difluoroethane in a content of less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight, in particular less than 1% by weight, more preferably less than 5000 ppm, preferred manner less than

2500 ppm,

ol, l-dichloro-2,2-difluoroethane in a content of less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight, in particular less than 1% by weight,

ol, 2,2-trichloro-l, l-difluoroethane in a content of less than 2% by weight based on the total weight of the composition, preferably less than 1% by weight, preferably less than 5000 ppm, more preferably less than 2500 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner.

o 1,2-dichloro-l-fluoroethane in an amount less than 10% by weight based on the total weight of said composition, preferably less than 9 wt%, preferably less than 8% by weight, more preferably less than 7 % by weight, in particular less than 6% by weight, more particularly less than 5% by weight, preferred manner less than 4% by weight, o-trichloro-1,1,2-fluroethane in a content of less than 2 % by weight based on the total weight of the composition, preferably less than 1% by weight, preferably less than 5000 ppm, more preferably less than 2500 ppm, in particular less than 1000 ppm, more preferably less than

500 ppm, preferred manner of less than 100 ppm,

o Trichlorethylene in a less than 3% content by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 10,000 ppm, more preferably less than 7500 ppm, in particular less than 5000 ppm, more particularly less than

3500 ppm,

ol, l, 2-trichloro-2-fluoroethane in an amount less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight, in particular less than 1% by weight,

o 1,1,2-trichloroethane in a content of less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight, in particular less than 1% by weight,

o 1,1,2,2-tetrachloro-l-fluoroethane in an amount less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner,

o Tetrachlorethylene in a content of less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 1000 ppm , more particularly less than

500 ppm, preferred manner of less than 100 ppm,

o 1,1,2,2-tetrachloroethane in a content of less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner,

based on the total weight of the composition.

According to another particular embodiment, said composition may comprise 1-chloro-2,2-difluoroethane, trans-l, 2-dichloroethylene, cis-l, 2-dichloroethylene, l-chloro-2,2,2-trifluoroethane and at least one additional compound selected from the group consisting of 1,1-difluoroethylene, 1-chloro-l-fluoroethylene, trans-l-chloro-2-fluoroethylene, 1,1,2-trifluoroethane, l-chloro-2 , 2-trifluoroethane, cis-l-chloro-2-fluoroethylene, 1,1-dichloroethylene, l, 2-dichloro-l, l-difluoroethane, l, l-dichloro-2,2-difluoroethane, 1,2,2 trichloro-l, l-difluoroethane, 1,2-dichloro-l-fluoroethane, 1,1,2-trichloro-l-fluroethane, trichlorethylene, l, l, 2-trichloro-2-fluoroethane, 1,1,2 -Trichloroethane, 1,1,2,2-tetrachloro-l-fluoroethane, tetrachlorethylene 1,1,1,2,2-pentachloroethane and H2O. Advantageously, said composition may comprise at least 40% by weight of l-chloro-2,2-difluoroethane, preferably at least 50% by weight, preferably at least 60% by weight; and a content by weight of trans-l, 2-dichloroethylene is less than 25%, preferably less than 20% by weight, preferably less than 15% by weight, more preferably less than 10% by weight, in particular less than 5 % by weight, more preferably less than 3% by weight, less than 10000 ppm privileged manner, more preferred less than 5000 ppm; a content by weight of cis-l, 2-dichloroethylene is less than 35%, preferably less than 30% by weight, preferably less than 20% by weight, more preferably less than 15% by weight, in particular less than 5% by weight, more particularly less than 1% by weight, less than 4000 ppm preferred manner; and a weight content of l-chloro-2,2-difluoroethane is less than 10%, preferably less than 5% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 2000 ppm; and less than 5% by weight, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight, in particular less than 1% by weight, more preferably less than 1000 ppm of said at least one additional compound selected from the group consisting of 1,1-difluoroethylene, 1-chloro-1-fluoroethylene, trans-l-chloro-2-fluoroethylene, 1,1,2-trifluoroethane, l-chloro-1,2 , 2-trifluoroethane, cis-l-chloro-2-fluoroethylene, 1,1-dichloroethylene, l, 2-dichloro-l, l-difluoroethane, l, l-dichloro-2,2-difluoroethane, l, 2,2 trichloro-l, l-difluoroethane, 1,2-dichloro-l-fluoroethane, 1,1,2-trichloro-l-fluroethane, trichlorethylene, l, l, 2-trichloro-2-fluoroethane, 1,1,2 -Trichloroethane, 1,1,2,2-tetrachloro-l-fluoroethane, tetrachlorethylene 1,1,1,2,2-pentachloroethane and H2O. Preferably said composition may comprise 1-chloro-2,2-difluoroethane, trans-l, 2-dichloroethylene, cis-l, 2-dichloroethylene, l-chloro-2,2,2-trifluoroethane and at least one, two , three, four, five, six, seven, eight, nine, ten, eleven, twelve, thirteen, fourteen, fifteen, sixteen, seventeen, eighteen or all of the additional compounds selected (s) from the group consisting of 1,1-difluoroethylene, 1-chloro-l-fluoroethylene, trans-l-chloro-2-fluoroethylene, 1,1,2-trifluoroethane, l-chloro-l, 2,2-trifluoroethane, cis -1- chloro-2-fluoroethylene, 1,1-dichloroethylene, l, 2-dichloro-l, l-difluoroethane, 1,1-dichloro-2,2-difluoroethane, l, 2,2-trichloro-l, l-difluoroethane, 1,2-dichloro-l-fluoroethane, 1,1,2-trichloro-l-fluroethane, trichlorethylene, l, l, 2-trichloro-2-fluoroethane, 1,1,2-trichloroethane, 1,1,2, 2-tetrachloro-l-fluoroethane, tetrachlorethylene 1,1,1,2,2-pentachloroethane and H2O. More preferably, said composition may comprise at least 40% by weight of l-chloro-2,2-difluoroethane, preferably at least 50% by weight, preferably at least 60% by weight; and a content by weight of trans-l, 2-dichloroethylene is less than 25%, preferably less than 20% by weight, preferably less than 15% by weight, more preferably less than 10% by weight, in particular less than 5 % by weight, more preferably less than 3% by weight, less than 10000 ppm privileged manner, more preferred less than 5000 ppm; a content by weight of cis-1,2-dichloroethylene is less than 35%, preferably less than 30% by weight, preferably less than 20% by weight, more preferably less than 15% by weight, in particular less than 5% by weight, more particularly less than 1% by weight, less than 4000 ppm preferred manner; and a weight content of l-chloro-2,2-difluoroethane is less than 10%, preferably less than 5% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 2000 ppm; and less than 5% by weight, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight, in particular less than 1% by weight, more preferably less than 1000 ppm of said at least one, two, three, four, five, six, seven, eight, nine, ten, eleven, twelve, thirteen, fourteen, fifteen, sixteen, seventeen, eighteen or all of the selected additional compounds ( s) from the group consisting of 1,1-difluoroethylene, 1-chloro-l-fluoroethylene, trans-l-chloro-2-fluoroethylene, 1,1,2-trifluoroethane, l-chloro-1,2,2-trifluoroethane , cis-l-chloro-2-fluoroethylene, 1,1-dichloroethylene, l, 2-dichloro-l, l-difluoroethane, l, l-dichloro-2,2-difluoroethane, l, 2,2-trichloro- , l-difluoroethane, 1,2-dichloro-l-fluoroethane, 1,1,2-trichloro-l-fluroethane, trichlorethylene, l, l, 2-trichloro-2-fluoroethane, 1,1,2-trichloroethane, 1 , 1,2,2-tetrachloro-l-fluoroethane, tetrachlorethylene 1,1,1,2,2-pentachloroethane and H 2 0.

Thus, said composition may comprise:

• at least 40% by weight of l-chloro-2,2-difluoroethane, preferably at least 50% by weight, preferably at least 60% by weight;

• a content by weight of trans-l, 2-dichloroethylene is less than 25%, preferably less than 20% by weight, preferably less than 15% by weight, more preferably less than 10% by weight, in particular less than 5 % by weight, more preferably less than 3% by weight, less than 10000 ppm privileged manner, more preferred less than 5000 ppm;

• a content by weight of cis-l, 2-dichloroethylene is less than 35%, preferably less than 30% by weight, preferably less than 20% by weight, more preferably less than 15% by weight, in particular less than 5 % by weight, more particularly less than 1% by weight, less than 4000 ppm preferred manner;

• a weight content of l-chloro-2,2-difluoroethane is less than 10%, preferably less than 5% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 2000 ppm, and

• at least one, two, three, four, five, six, seven, eight, nine, ten, eleven, twelve, thirteen, fourteen, fifteen, sixteen, seventeen, eighteen, nineteen, twenty, twenty -a or all of the additional compounds selected (s) from the group consisting of:

o 1,1-difluoroethylene in a content of less than 1% by weight based on the total weight of the composition, preferably less than 0.5% by weight, preferably less than 1000 ppm, more preferably less than 500ppm, especially less 250 ppm, more preferably less than 200 ppm, less than 50 ppm preferred manner, more preferred manner less than 10 ppm, even more preferred less than 1 ppm, o 1-chloro-l-fluoroethylene in an amount less than to 1% by weight based on the total weight of the composition, preferably less than 5000 ppm, preferably less than 2500 ppm, more preferably less than 1000 ppm,

o trans-l-chloro-2-fluoroethylene in an amount less than 2% by weight based on the total weight of the composition, preferably less than 1% by

weight, preferably less than 8000 ppm, more preferably less than 5000 ppm, in particular less than 4000 ppm, more preferably less than 3000 ppm,

1,1,2-trifluoroethane in a content of less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight , in particular less than 1% by weight, more preferably less than 1000 ppm, less than 500 ppm privileged manner, more preferred way of less than 100 ppm, even more preferred less than 50 ppm.

l-chloro-l, 2,2-trifluoroethane in a less than 1% content by weight based on the total weight of the composition, preferably less than 5000 ppm, preferably less than 4000 ppm, more preferably less than 3000 ppm, especially less than 2000 ppm, more preferably less than 1600 ppm,

cis-l-chloro-2-fluoroethylene in an amount less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight, in particular less than 1% by weight, more preferably less than 8000 ppm,

1.1- dichloroethylene in a content of less than 2% by weight based on the total weight of the composition, preferably less than 1% by weight, preferably less than 0.5% by weight, more preferably less than lOOOppm, in particular less than 500 ppm, more preferably less than 100 ppm, less than 50 ppm preferred manner, more preferred manner less than 10 ppm, even more preferred less than 1 ppm,

1.2- dichloro-l, l-difluoroethane in a content of less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight, in particular less than 1% by weight, in particular less than 5000 ppm, less than 2500 ppm preferred manner,

ol, l-dichloro-2,2-difluoroethane in a content of less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight, in particular less than 1% by weight,

ol, 2,2-trichloro-l, l-difluoroethane in a content of less than 2% by weight based on the total weight of the composition, preferably less than 1% by weight, preferably less than 5000 ppm, more preferably less than 2500 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner.

o 1,2-dichloro-l-fluoroethane in an amount less than 10% by weight based on the total weight of said composition, preferably less than 9 wt%, preferably less than 8% by weight, more preferably less than 7 % by weight, in particular less than 6% by weight, more particularly less than 5% by weight, preferred manner less than 4% by weight, o-trichloro-1,1,2-fluroethane in a content of less than 2 % by weight based on the total weight of the composition, preferably less than 1% by weight, preferably less than 5000 ppm, more preferably less than 2500 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm preferred,

o Trichlorethylene in a less than 3% content by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 10,000 ppm, more preferably less than 7500 ppm, in particular less than 5000 ppm, more preferably less than 3500 ppm,

ol, l, 2-trichloro-2-fluoroethane in an amount less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight, in particular less than 1% by weight,

o 1,1,2-trichloroethane in a content of less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight, in particular less than 1% by weight,

o 1,1,2,2-tetrachloro-l-fluoroethane in an amount less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner,

o tetrachlorethylene in a content of less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 1000 ppm , more preferably less than 500 ppm, less than 100 ppm privileged manner,

o 1,1,1,2,2-pentachloroethane in a content of less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less to 5000 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner, more preferred manner less than 50 ppm,

o H2O in a less than 1% content by weight based on the total weight of the composition, preferably less than 5000 ppm, preferably less than 3000 ppm, more preferably less than 1000 ppm, in particular less than 750 ppm, more preferably less 500 ppm, less than 250 ppm privileged manner, more preferred way of less than 100 ppm, even more preferred less than 50 ppm, the most preferred manner of less than 10 ppm,

based on the total weight of the composition.

According to another aspect of the present invention, a composition comprising 1-chloro-2,2-difluoroethane and H2O is supplied. Said composition may comprise at least 40% by weight of l-chloro-2,2-difluoroethane based on the total weight of the composition, preferably at least 50% by weight of l-chloro-2,2-difluoroethane, preferably at least 60% by weight of l-chloro-2,2-difluoroethane, in particular at least 80% by weight of 1-chloro-2,2-difluoroethane, more particularly at least 90% by weight of l-chloro-2, 2-difluoroethane, preferentially at least 95% by weight of l-chloro-2,2-difluoroethane.

According to a preferred embodiment, the H2O content in the composition is less than 2000 ppm, preferably less than 1000 ppm, preferably less than 750 ppm, more preferably less than 550 ppm, in particular less than 100 ppm, more preferably less 10 h ppm O.

Thus, said composition may comprise at least 40% by weight, preferably at least 50% by weight, preferably at least 60% by weight, in particular at least 80% by weight, more preferably at least 90% by weight so as preferred at least 95% by weight of l-chloro-2,2-difluoroethane based on the total weight of the composition; and an H2O content of less than 2000 ppm, preferably less than 1000 ppm, preferably less than 750 ppm, more preferably less than 550 ppm, in particular less than 100 ppm, more preferably less than 10 ppm h O.

Said composition may comprise at least 80% by weight of l-chloro-2,2-difluoroethane based on the total weight of the composition; and an H2O content of less than 750 ppm.

En outre, ladite composition peut comprendre au moins un composé additionnel sélectionné parmi le groupe consistant en 1,1-difluoroethylene, 1,1,1-trifluoroethane, chlorotrifluoroethylene, 1-chloro-l-fluoroethylene, 1,1-difluoroethane, trans-l-chloro-2-fluoroethylene, 1,1,2-trifluoroethane, l-chloro-2,2,2-trifluoroethane, l-chloro-1,2,2-trifluoroethane, cis-l-chloro-2-fluoroethylene, 2,2-dichloro-l,l,l-trifluoroethane, 1,1-dichloro-1-fluorethane, 1,1-dichloroethylene, l-chloro-2,2-difluoroethane, 1,2-dichloro-l-fluoroethylene, l,l-dichloro-2-fluoroethylene, l,2-dichloro-l,l-difluoroethane, trans-1,2-dichloroethylene, l,l-dichloro-2,2-difluorethane, cis-l,2-dichloroethylene, l,2,2-trichloro-l,l-difluoroethane, 1,2-dichloro-l-fluoroethane, 1,1,1-trichloroethane, 1,1-dichloroethane, 1,1,2-trichloro-l-fluroethane, trichloroethylene, l,l,2-trichloro-2-fluoroethane, 1,1,2-trichloroethane, 1,1,2,2-tetrachloro-l-fluoroethane, tetrachloroethylene, 1,1,1,2-tetrachloroethane, 1,1,2,2-tetrachloroethane, 1,1,1,2,2-pentachloroethane, tetrachloromethane, 1,2,2-trichloro-l-fluoroethylene, les isomères du chloropropène, 1,2-dichloro-l-fluoroethylene, l-chloro-2-fluoroethane, 1-chloro-l-fluoroethane, l,l-chloro-2,2,2-trifluoroethane, l,l,l-trichloro-2,2-difluoroethane, 1-chloroethylene, 1,1-dichloroethylene et 1-fluoroethylene. De préférence, ladite composition comprend moins de 40% en poids dudit au moins un composé additionnel sur base du poids total de la composition, avantageusement moins de 35% en poids, de préférence moins de 30% en poids, plus préférentiellement moins de 25% en poids, en particulier moins de 20% en poids, plus particulièrement moins de 10% en poids dudit au moins un composé additionnel sur base du poids total de la composition. En particulier, ladite composition comprend moins de 5% en poids dudit au moins un composé additionnel sur base du poids total de la composition, avantageusement moins de 4% en poids dudit au moins un composé additionnel, de préférence moins de 3% en poids dudit au moins un composé additionnel, plus préférentiellement moins de 2% en poids dudit au moins un composé additionnel, en particulier moins de 1% en poids dudit au moins un composé additionnel, plus particulièrement moins de 1000 ppm dudit au moins un composé additionnel sur base du poids total de la composition.

Advantageously, said composition may comprise l-chloro-2,2-difluoroethane, H2O, trans-l, 2-dichloroethylene and 1,1-dichloroethylene. The composition may include:

• at least 40% by weight, preferably at least 50% by weight, preferably at least 60% by weight, in particular at least 80% by weight, more preferably at least 90% by weight, preferred at least 95% by weight of l-chloro-2,2-difluoroethane,

• a H 2 O content less than 2000 ppm, preferably less than 1000 ppm, preferably less than 750 ppm, more preferably less than 550ppm, especially less than 100 ppm H2O, more preferably less than 10 ppm of O h,

• a content of trans-l, 2-dichloroethylene less than 30% by weight based on the total weight of the composition, preferably less than 20% by weight, preferably less than 15% by weight, more preferably less than 10% by weight, in particular less than 5% by weight, more particularly less than 1% by weight, less than 7500 ppm preferred manner, more preferred manner of less than 5000 ppm,

• a content of 1,1-dichloroethylene less than 2% by weight based on the total weight of the composition, preferably less than 1% by weight, preferably less than 0.5% by weight, more preferably less than lOOOppm, in especially less than 500 ppm, more preferably less than 100 ppm, less than 50 ppm preferred manner, more preferred manner less than 10 ppm, even more preferred less than 1 ppm.

Said composition may also comprise cis-l, 2-dichloroethylene in a content of less than 40% by weight based on the total weight of the composition, preferably less than 30% by weight, preferably less than 20% by weight, more preferably less than 15% by weight, in particular less than 10% by weight, more particularly less than 5% by weight.

Said composition may also comprise 1,1,2-trifluoroethane in a content less than 5% by weight, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight, especially less than 1% by weight, more preferably less than 1000 ppm, less than 500 ppm privileged manner, more preferred manner less than 100 ppm, still more preferred manner of less than 50 ppm; and / or l-chloro-2,2,2-trifluoroethane in a content less than 5% by weight, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight , in particular less than 1% by weight, more preferably less than 1000 ppm, less than 500 ppm privileged manner, more preferred way of less than 100 ppm, even more preferred less than 60 ppm based on the total weight of the composition.

Said composition may also comprise at least one additional compound selected from the group consisting of 1,1-difluoroethylene, 1,1,1-trifluoroethane, chlorotrifluoroethylene, 1-chloro-l-fluoroethylene, 1,1-difluoroethane, trans-l- chloro-2-fluoroethylene, l-chloro-l, 2,2-trifluoroethane, cis-l-chloro-2-fluoroethylene, 2,2-dichloro-1,1,1-trifluoroethane, 1,1-dichloro-l- fluoroethane, 1,2-dichloro-l-fluoroethylene, 1,1-dichloro-2-fluoroethylene, l, 2-dichloro-l, l-difluoroethane, l, l-dichloro-2,2-difluoroethane, 1,2, 2-trichloro-l, l-difluoroethane, 1,2-dichloro-l-fluoroethane, 1,1,1-trichloroethane, 1,1-dichloroethane, 1,1,2-trichloro-l-fluroethane, trichlorethylene, l, l, 2-trichloro-2-fluoroethane, 1,1,2-trichloroethane, 1,1,2,2-tetrachloro-l-fluoroethane, tetrachlorethylene, 1,1,1,2-tetrachloroethane, 1,1,2, 2-tetrachloroethane, 1,1,1,2,2-pentachloroethane, tetrachloromethane, 1,2,2-trichloro-l-fluoroethylene, isomers of chloropropene, 1,2-dichloro-l-fluoroethylene, l- chloro-2-fluoroethane, 1-chloro-l-fluoroethane, l, l-chloro-2,2,2-trifluoroethane, l, l, l-trichloro-2,2-difluoroethane, 1-chloride-, 1,1- dichloroethylene and 1-fluoroethylene; preferably in a content of less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight, in particular less 1% by weight, in particular less than 1000 ppm of said at least one additional compound based on the total weight of the composition.

Advantageously, said additional compound may be selected from the group consisting of 1,1-difluoroethylene, 1,1,1-trifluoroethane, chlorotrifluoroethylene, 1-chloro-l- fluoroethylene, 1,1-difluoroethane, trans-l-chloro-2 -fluoroethylene, l-chloro-1,2,2-trifluoroethane, cis-l-chloro-2-fluoroethylene, 2,2-dichloro-l, l, l-trifluoroethane, 1,2-dichloro-1,1-difluoroethane , l, l-dichloro-2,2-difluoroethane, l, 2,2-trichloro-l, l-difluoroethane, 1,2-dichloro-l-fluoroethane, 1,1,2-trichloro-l-fluroethane, trichlorethylene , l, l, 2-trichloro-2-fluoroethane, 1,1,2-trichloroethane, 1,1,2,2-tetrachloro-l-fluoroethane, tetrachlorethylene, 1,1,2,2-tetrachloroethane, 1.1 , 1,2,2-pentachloroethane; preferably in a content of less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight, in particular less 1% by weight, in particular less than 1000 ppm of said at least one additional compound based on the total weight of the composition. Thus, said composition may comprise:

• at least 40% by weight, preferably at least 50% by weight, preferably at least 60% by weight, in particular at least 80% by weight, more preferably at least 90% by weight, preferred at least 95% by weight of l-chloro-2,2-difluoroethane,

• H 2 O in a content less than 2000 ppm, preferably less than 1000 ppm, preferably less than 750 ppm, more preferably less than 550ppm, especially less than 100 ppm H2O, more preferably less than 10 ppm of O h,

• trans-l, 2-dichloroethylene in a content of less than 30% by weight based on the total weight of the composition, preferably less than 20% by weight, preferably less than 15% by weight, more preferably less than 10% by weight, in particular less than 5% by weight, more particularly less than 1% by weight, less than 7500 ppm preferred manner, more preferred manner of less than 5000 ppm,

· 1,1-dichloroethylene in a content of less than 2% by weight based on the total weight of the composition, preferably less than 1% by weight, preferably less than 0.5% by weight, more preferably less than lOOOppm, in especially less than 500 ppm, more preferably less than 100 ppm, less than 50 ppm preferred manner, more preferred manner less than 10 ppm, even more preferred less than 1 ppm,

• cis-l, 2-dichloroethylene in a content of less than 40% by weight based on the total weight of the composition, preferably less than 30% by weight, preferably

less than 20% by weight, more preferably less than 15% by weight, in particular less than 10% by weight, more particularly less than 5% by weight 1,1,2-trifluoroethane in a content of less than 5% by weight , preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight, in particular less than 1% by weight, more preferably less than 1000 ppm, preferred manner of less than 500 ppm , more preferred less than 100 ppm, even more preferred less than 50 ppm; and / or l-chloro-2,2,2-trifluoroethane in a content less than 5% by weight, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight , in particular less than 1% by weight, more preferably less than 1000 ppm, less than 500 ppm privileged manner, more preferred way of less than 100 ppm, even more preferred less than 60 ppm, and

at least one, two, three, four, five, six, seven, eight, nine, ten, eleven, twelve, thirteen, fourteen, fifteen, sixteen, seventeen, eighteen, nineteen, twenty, twenty one or all of the additional compounds selected (s) from the group consisting of:

o 1,1-difluoroethylene in a content of less than 1% by weight based on the total weight of the composition, preferably less than 0.5% by weight, preferably less than 1000 ppm, more preferably less than 500ppm, especially less 250 ppm, more preferably less than 200 ppm, preferred manner less than 50 ppm, more preferred manner less than 10 ppm, still more preferred manner of less than 1 ppm, o 1,1,1-trifluoroethane in a lower content to 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 2% by weight, more preferably less than 1% by weight, in particular less than 250 ppm, more preferably less 200 ppm, less than 50 ppm preferred manner, more preferred manner less than 10 ppm, even more preferred less than 1 ppm,

o chlorotrifluoroethylene in a content less than 1000 ppm, preferably less than 500 ppm, preferably less than 250 ppm, more preferably less than 100 ppm, in particular less than 50 ppm,

o 1-chloro-l-fluoroethylene in an amount less than 1% by weight based on the total weight of the composition, preferably less than 5000 ppm, preferably less than 2500 ppm, more preferably less than 1000 ppm,

o 1,1-difluoroethane in a content of less than 1% by weight based on the total weight of the composition, preferably less than 5000 ppm, preferably less than 2500 ppm, more preferably less than 1000 ppm, in particular less than 500 ppm , more preferably less than 300 ppm o trans-l-chloro-2-fluoroethylene in an amount less than 2% by weight based on the total weight of the composition, preferably less than 1% by weight, preferably less than 8000 ppm , more preferably less than 5000 ppm, in particular less than 4000 ppm, more preferably less than 3000 ppm,

o l-chloro-l, 2,2-trifluoroethane in a content of less than 1% by weight based on the total weight of the composition, preferably less than 5000 ppm, preferably less than 4000 ppm, more preferably less than 3000 ppm, in particular less than 2000 ppm, more preferably less than 1600 ppm,

o cis-l-chloro-2-fluoroethylene in an amount less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2 % by weight, in particular less than 1% by weight, more preferably less than 8000 ppm,

o 2,2-dichloro-l, l, l-trifluoroethane in a content of less than 1% by weight based on the total weight of the composition, preferably less than 5000 ppm, preferably less than 4000 ppm, more preferably less than 3000 ppm, in particular less than 2000 ppm, more preferably less than 1000 ppm,

o 1,1,2-trichloro-l-fluroethane in a content of less than 2% by weight based on the total weight of the composition, preferably less than 1% by weight, preferably less than 5000 ppm, more preferably less than 2500 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner,

o trichlorethylene in a content of less than 3% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 10,000 ppm, more preferably less than 7500 ppm, in particular less than 5000 ppm, more preferably less than 3500 ppm,

o 1,1,2-trichloroethane in a content of less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight, in particular less than 1% by weight,

o 1,1,2,2-tetrachloro-l-fluoroethane in an amount less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner,

o 1,1,2,2-tetrachloroethane in a content of less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2 % by weight, in particular less than 1% by weight,

o 1,1,1,2,2-pentachloroethane in a content of less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less to 5000 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner, more preferred manner less than 50 ppm,

based on the total weight of the composition.

In particular, said additional compound may be selected from the group consisting of 1,1-difluoroethylene, 1-chloro-l-fluoroethylene, trans-l-chloro-2-fluoroethylene, l-chloro-l, 2,2-trifluoroethane, cis-l-chloro-2-fluoroethylene, l, 2-dichloro-l, l-difluoroethane, l, l-dichloro-2,2-difluoroethane, l, 2,2-trichloro-l, l-difluoroethane, 1, 2-dichloro-l-fluoroethane, 1,1,2-trichloro-l-fluroethane, trichlorethylene, l, l, 2-trichloro-2-fluoroethane, 1,1,2-trichloroethane, 1,1,2,2 tetrachloro-l-fluoroethane, tetrachlorethylene, 1,1,2,2-, 1,1,1,2,2-pentachloroethane; preferably in a content of less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight, in particular less 1% by weight, in particular less than 1000 ppm of said at least one additional compound based on the total weight of the composition. Thus, said composition may comprise:

• at least 40% by weight, preferably at least 50% by weight, preferably at least 60% by weight, in particular at least 80% by weight, more preferably at least 90% by weight, preferred at least 95% by weight of l-chloro-2,2-difluoroethane,

· H2O in a content less than 2000 ppm, preferably less than 1000 ppm, preferably less than 750 ppm, more preferably less than 550ppm, especially less than 100 ppm H2O, more preferably less than 10 ppm of O h,

• trans-l, 2-dichloroethylene in a content of less than 30% by weight based on the total weight of the composition, preferably less than 20% by weight, preferably less than 15% by weight, more preferably less than 10% by weight, in particular less than 5% by weight, more particularly less than 1% by weight, less than 7500 ppm preferred manner, more preferred manner of less than 5000 ppm,

• 1,1-dichloroethylene in a content of less than 2% by weight based on the total weight of the composition, preferably less than 1% by weight, preferably less than 0.5% by weight, more preferably less than lOOOppm, in especially less than 500 ppm, more preferably less than 100 ppm, less than 50 ppm preferred manner, more preferred manner less than 10 ppm, even more preferred less than 1 ppm,

· Cis-l, 2-dichloroethylene in a content of less than 40% by weight based on the total weight of the composition, preferably less than 30% by weight, preferably less than 20% by weight, more preferably less than 15% by weight, in particular less than 10% by weight, more particularly less than 5% by weight,

• 1,1,2-trifluoroethane in a content less than 5% by weight, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight, in particular less than 1% by weight, more preferably less than 1000 ppm, less than 500 ppm privileged manner, more preferred less than 100 ppm, still more preferred manner of less than 50 ppm; and / or l-chloro-2,2,2-trifluoroethane in a content less than 5% by weight, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight , in particular less than 1% by weight, more preferably less than 1000 ppm, less than 500 ppm privileged manner, more preferred way of less than 100 ppm, even more preferred less than 60 ppm, and

at least one, two, three, four, five, six, seven, eight, nine, ten, eleven, twelve, thirteen, fourteen, fifteen, sixteen or all of the additional compounds selected (s) from the group consisting of:

o 1,1-difluoroethylene in a content of less than 1% by weight based on the total weight of the composition, preferably less than 0.5% by weight, preferably less than 1000 ppm, more preferably less than 500ppm, especially less 250 ppm, more preferably less than 200 ppm, less than 50 ppm preferred manner, more preferred manner less than 10 ppm, even more preferred less than 1 ppm, o 1-chloro-l-fluoroethylene in an amount less than to 1% by weight based on the total weight of the composition, preferably less than 5000 ppm, preferably less than 2500 ppm, more preferably less than 1000 ppm,

o trans-l-chloro-2-fluoroethylene in an amount less than 2% by weight based on the total weight of the composition, preferably less than 1% by weight, preferably less than 8000 ppm, more preferably less than 5000 ppm, in particular less than 4000 ppm, more preferably less than 3000 ppm,

o l-chloro-l, 2,2-trifluoroethane in a content of less than 1% by weight based on the total weight of the composition, preferably less than 5000 ppm, preferably less than 4000 ppm, more preferably less than 3000 ppm, in particular less than 2000 ppm, more preferably less than 1600 ppm,

o cis-l-chloro-2-fluoroethylene in an amount less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2 % by weight, in particular less than 1% by weight, more preferably less than 8000 ppm,

o 1,1,2-trichloro-l-fluroethane in a content of less than 2% by weight based on the total weight of the composition, preferably less than 1% by weight, preferably less than 5000 ppm, more preferably less than 2500 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner,

o trichlorethylene in a content of less than 3% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 10,000 ppm, more preferably less than 7500 ppm, in particular less than 5000 ppm, more preferably less than 3500 ppm,

o 1,1,2-trichloroethane in a content of less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight, in particular less than 1% by weight,

o 1,1,2,2-tetrachloro-l-fluoroethane in an amount less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner,

o 1,1,2,2-tetrachloroethane in a content of less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2 % by weight, in particular less than 1% by weight,

o 1,1,1,2,2-pentachloroethane in a content of less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less to 5000 ppm, in particular less than 1000 ppm, more preferably less than

500 ppm, less than 100 ppm privileged manner, more preferred manner less than 50 ppm,

based on the total weight of the composition.

According to another preferred embodiment, said composition may mprendre:

• at least 40% by weight, preferably at least 50% by weight, preferably at least 60% by weight, in particular at least 80% by weight, more preferably at least 90% by weight, preferred at least 95% by weight of l-chloro-2,2-difluoroethane,

• H 2 O in a content less than 2000 ppm, preferably less than 1000 ppm, preferably less than 750 ppm, more preferably less than 550ppm, especially less than 100 ppm H2O, more preferably less than 10 ppm of O h,

• at least one, two, three, four, five, six, seven, eight, nine, ten, eleven, twelve, thirteen or all of the additional compounds selected (s) from the group consisting of: 1,1-difluoroethylene , 1-chloro-l-fluoroethylene, 1,1-difluoroethane, 1,1-dichloroethylene, 1,2-dichloro-l-fluoroethylene, l, 2-dichloro-l, l-difluoroethane, 1,1-dichloro-2 , 2-difluoroethane, 1,2-dichloro-l-fluoroethylene, l-chloro-2-fluoroethane, 1- chloro-l-fluoroethane, l, l-chloro-2,2,2-trifluoroethane, l, l, l trichloro-2,2-difluoroethane, 1-and chloride-1-fluoroethylene.

Preferably said composition may comprise:

• at least 40% by weight, preferably at least 50% by weight, preferably at least 60% by weight, in particular at least 80% by weight, more preferably at least 90% by weight, preferred at least 95% by weight of l-chloro-2,2-difluoroethane,

• H 2 O in a content less than 2000 ppm, preferably less than 1000 ppm, preferably less than 750 ppm, more preferably less than 550ppm, especially less than 100 ppm H2O,

• at least one, two, three, four, five, six, seven, eight, nine, ten, eleven, twelve, thirteen or all of the additional compounds selected (s) from the group consisting of: o 1,1 difluoroethylene in a content of less than 1% by weight based on the total weight of the composition, preferably less than 0.5% by weight, preferably less than 1000 ppm, more preferably less than 500ppm, especially less than 250 ppm, more particularly less than 200 ppm, less than 50 ppm preferred manner, more preferred manner less than 10 ppm, even more preferred less than 1 ppm.,

o 1-chloro-l-fluoroethylene in an amount less than 1% by weight based on the total weight of the composition, preferably less than 5000 ppm, preferably less than 2500 ppm, more preferably less than 1000 ppm,

o 1,1-difluoroethane in a content of less than 1% by weight based on the total weight of the composition, preferably less than 5000 ppm, preferably less than 2500 ppm, more preferably less than 1000 ppm, in particular less than 500 ppm , more preferably less than 300 ppm o 1,1-dichloroethylene in a content of less than 2% by weight based on the total weight of the composition, preferably less than 1% by weight, preferably less than 0.5% by weight , more preferably less than lOOOppm, in particular less than 500 ppm, more preferably less than 100 ppm, less than 50 ppm preferred manner, more preferred manner less than 10 ppm, even more preferred less than 1 ppm,

o 1,2-dichloro-l-fluoroethylene in an amount less than 1% by weight based on the total weight of the composition, preferably less than 5000 ppm, preferably less than 4000 ppm, more preferably less than 3000 ppm, in particular less than 2000 ppm, more preferably less than 1000 ppm,

ol, 2-dichloro-l, l-difluoroethane in a content of less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight, in particular less than 1% by weight, more preferably less than 5000 ppm, preferred manner less than

2500 ppm,

ol, l-dichloro-2,2-difluoroethane in a content of less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight, in particular less than 1% by weight,

o 1,2-dichloro-l-fluoroethylene in an amount less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner, more preferred manner less than 50 ppm,

o-chloro-2-fluoroethane in an amount less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner, more preferred manner less than 50 ppm,

o 1-chloro-l-fluoroethane in an amount less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner, more preferred manner less than 50 ppm,

ol, l-chloro-2,2,2-trifluoroethane in a content of less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner, more preferred manner less than 50 ppm,

ol, l, l-trichloro-2,2-difluoroethane in a content of less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner, more preferred manner less than 50 ppm,

o 1-chloride-in a content of less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner, more preferred manner less than 50 ppm, and

o 1-fluoroethylene in an amount less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner, more preferred less than 50 ppm;

based on the total weight of the composition.

According to another preferred embodiment, said composition may comprise:

· At least 40% by weight, preferably at least 50% by weight, preferably at least 60% by weight, in particular at least 80% by weight, more preferably at least 90% by weight, preferred at least 95% by weight of l-chloro-2,2-difluoroethane,

• H 2 O in a content less than 2000 ppm, preferably less than 1000 ppm, preferably less than 750 ppm, more preferably less than 550ppm, especially less than 100 ppm H2O, more preferably less than 10 ppm of O h,

• at least one, two, three, four, five, six, seven, eight, nine, ten or all of the additional compounds selected (s) from the group consisting of:

1,1,1-trifluoroethane, 1,1-difluoroethane, trans-l-chloro-2-fluoroethylene, 1,1,2- trifluoroethane, l-chloro-2,2,2-trifluoroethane, l-chloro-l,2,2-trifluoroethane, cis-1- chloro-2-fluoroethylene, 1,2-dichloro-l-fluoroethylene, l,l-dichloro-2-fluoroethylene, l-chloro-2-fluoroethane et 1-chloro-l-fluoroethane.

Preferably said composition may comprise:

• at least 40% by weight, preferably at least 50% by weight, preferably at least 60% by weight, in particular at least 80% by weight, more preferably at least 90% by weight, preferred at least 95% by weight of l-chloro-2,2-difluoroethane,

• H 2 O in a content less than 2000 ppm, preferably less than 1000 ppm, preferably less than 750 ppm, more preferably less than 550ppm, especially less than 100 ppm H2O, more preferably less than 10 ppm of O h,

• at least one, two, three, four, five, six, seven, eight, nine, ten or all of the additional compounds selected (s) from the group consisting of:

o 1,1,1-trifluoroethane in a content of less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 2% by weight, more preferably less than 1% by weight, in particular less than 250 ppm, more preferably less than 200 ppm, less than 50 ppm preferred manner, more preferred manner less than 10 ppm, even more preferred less than 1 ppm,

o 1,1-difluoroethane in a content of less than 1% by weight based on the total weight of the composition, preferably less than 5000 ppm, preferably less than 2500 ppm, more preferably less than 1000 ppm, in particular less than 500 ppm , more preferably less than 300 ppm o trans-l-chloro-2-fluoroethylene in an amount less than 2% by weight based on the total weight of the composition, preferably less than 1% by weight, preferably less than 8000 ppm , more preferably less than 5000 ppm, in particular less than 4000 ppm, more preferably less than 3000 ppm,

o 1,1,2-trifluoroethane in a content of less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight, in particular less than 1% by weight, more preferably less than

1000 ppm, less than 500 ppm privileged manner, more preferred way of less than 100 ppm, even more preferred less than 50 ppm,

o-chloro-2,2,2-trifluoroethane in a content of less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less to 2% by weight, in particular less than 1% by weight, more preferably less than 1000 ppm, less than 500 ppm privileged manner, more preferred way of less than 100 ppm, even more preferred less than 60 ppm,

o l-chloro-l, 2,2-trifluoroethane in a content of less than 1% by weight based on the total weight of the composition, preferably less than 5000 ppm, preferably less than 4000 ppm, more preferably less than 3000 ppm, in particular less than 2000 ppm, more preferably less than 1600 ppm,

o cis-l-chloro-2-fluoroethylene in an amount less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2 % by weight, in particular less than 1% by weight, more preferably less than 8000 ppm,

o 1,2-dichloro-l-fluoroethylene in an amount less than 1% by weight based on the total weight of the composition, preferably less than 5000 ppm, preferably less than 4000 ppm, more preferably less than 3000 ppm, in particular less than 2000 ppm, more preferably less than 1000 ppm,

ol, l-dichloro-2-fluoroethylene in an amount less than 1% by weight based on the total weight of the composition, preferably less than 5000 ppm, preferably less than 4000 ppm, more preferably less than 3000 ppm, in particular less than to 2000 ppm, more preferably less than 1000 ppm,

o-chloro-2-fluoroethane in an amount less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner, more preferred manner less than 50 ppm, and

o 1-chloro-l-fluoroethane in an amount less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner, more preferred manner less than 50 ppm;

based on the total weight of the composition.

According to another aspect of the present invention, a composition comprising 1-chloro-2,2-difluoroethane, l-chloro-2-fluoroethane and 1-chloro-l-fluoroethane is provided. Advantageously, said composition comprises at least 40% by weight, preferably at least 50% by weight, preferably at least 60% by weight, in particular at least 80% by weight, more preferably at least 90% by weight, in a privileged manner at least 95% by weight of l-chloro-2,2-difluoroethane; a content of l-chloro-2-fluoroethane less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, especially less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner, more preferred manner less than 50 ppm; and a content of 1-chloro-l-fluoroethane less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner, more preferred manner less than 50 ppm; based on the total weight of the composition.

According to a preferred embodiment, said composition may also comprise at least one additional compound selected from the group consisting of 1,1-difluoroethylene, 1,1,1-trifluoroethane, chlorotrifluoroethylene, 1-chloro-l-fluoroethylene, 1.1 difluoroethane, trans-l-chloro-2-fluoroethylene, l-chloro-l, 2,2-trifluoroethane, cis-l-chloro-2-fluoroethylene, 2,2-dichloro-l, l, l-trifluoroethane, 1 , 1-dichloro-l-fluoroethane, 1,2-dichloro-l-fluoroethylene, l, l-dichloro-2-fluoroethylene, l, 2-dichloro-l, l-difluoroethane, 1,1-dichloro-2,2 -difluorethane, cis-l, 2-dichloroethylene, l, 2,2-trichloro-l, l-difluoroethane, 1,2-dichloro-l-fluoroethane, 1,1,1-trichloroethane, 1,1-dichloroethane, 1 , 1,2-trichloro-l-fluroethane, trichlorethylene, l, l, 2-trichloro-2-fluoroethane, 1,1,2-trichloroethane, 1,1,2,2-tetrachloro-l-fluoroethane, tetrachlorethylene, 1 , 1,1,2-tetrachloroethane, 1,1,2,2-tetrachloroethane, 1,1,1,2,2-pentachloroethane, tetrachloromethane, 1,2,2-trichloroethane-l-fluoroethylene , Isomers of chloropropene, 1,2-dichloro-l-fluoroethylene, l, l-chloro-2,2,2-trifluoroethane, l, l, l-trichloro-2,2-difluoroethane, 1-chloride-, 1- fluoroethylene, H2O and HCl.

Advantageously, said at least one additional compound is selected from the group consisting of 1,1-difluoroethylene, 1-chloro-l-fluoroethylene, 1,1-difluoroethane, 1,1-dichloroethylene, 1,2-dichloro-l-fluoroethylene , l, 2-dichloro-l, l-difluoroethane, 1,1-dichloro-2,2-difluoroethane, 1,2-dichloro-l-fluoroethylene, l, l-chloro-2,2,2-trifluoroethane, 1 , 1,1-trichloro-2,2-difluoroethane, 1-and chloride-1-fluoroethylene.

Thus, said composition may comprise:

• at least 40% by weight, preferably at least 50% by weight, preferably at least 60% by weight, in particular at least 80% by weight, more preferably at

least 90% by weight, preferred at least 95% by weight of l-chloro-2,2-difluoroethane;

a content of l-chloro-2-fluoroethane less than 5% by weight, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 1000 ppm, more particularly less than 500 ppm, less than 100 ppm privileged manner, more preferred manner less than 50 ppm;

a content of 1-chloro-l-fluoroethane less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, especially less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner, more preferred manner less than 50 ppm;

at least one, two, three, four, five, six, seven, eight, nine, ten, eleven or all of the additional compounds selected (s) from the group consisting of:

o 1,1-difluoroethylene in a content of less than 1% by weight based on the total weight of the composition, preferably less than 0.5% by weight, preferably less than 1000 ppm, more preferably less than 500ppm, especially less 250 ppm, more preferably less than 200 ppm, less than 50 ppm preferred manner, more preferred manner less than 10 ppm, even more preferred less than 1 ppm., o 1-chloro-l-fluoroethylene in an amount less than 1% by weight based on the total weight of the composition, preferably less than 5000 ppm, preferably less than 2500 ppm, more preferably less than 1000 ppm,

o 1,1-difluoroethane in a content of less than 1% by weight based on the total weight of the composition, preferably less than 5000 ppm, preferably less than 2500 ppm, more preferably less than 1000 ppm, in particular less than 500 ppm , more preferably less than 300 ppm o 1,1-dichloroethylene in a content of less than 2% by weight based on the total weight of the composition, preferably less than 1% by weight, preferably less than 0.5% by weight , more preferably less than lOOOppm, in particular less than 500 ppm, more preferably less than 100 ppm, preferred manner less than 50 ppm, more

preferred less than 10 ppm, still more preferred manner of less than 1 ppm,

o 1,2-dichloro-l-fluoroethylene in an amount less than 1% by weight based on the total weight of the composition, preferably less than 5000 ppm, preferably less than 4000 ppm, more preferably less than 3000 ppm, in particular less than 2000 ppm, more preferably less than 1000 ppm,

ol, 2-dichloro-l, l-difluoroethane in a content of less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight, in particular less than 1% by weight, more preferably less than 5000 ppm, less than 2500 ppm preferred manner,

ol, l-dichloro-2,2-difluoroethane in a content of less than 5% by weight based on the total weight of the composition, preferably less than 4% by weight, preferably less than 3% by weight, more preferably less than 2% by weight, in particular less than 1% by weight,

o 1,2-dichloro-l-fluoroethylene in an amount less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner, more preferred manner less than 50 ppm,

ol, l-chloro-2,2,2-trifluoroethane in a content of less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner, more preferred manner less than 50 ppm,

ol, l, l-trichloro-2,2-difluoroethane in a content of less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 1000 ppm, more

particularly less than 500 ppm, less than 100 ppm privileged manner, more preferred manner less than 50 ppm,

o 1-chloride-in a content of less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner, more preferred manner less than 50 ppm, and

o 1-fluoroethylene in an amount less than 5% by weight based on the total weight of the composition, preferably less than 2% by weight, preferably less than 1% by weight, more preferably less than 5000 ppm, in particular less than 1000 ppm, more preferably less than 500 ppm, less than 100 ppm privileged manner, more preferred less than 50 ppm;

based on the total weight of the composition

Advantageously, said at least one additional compound may also be selected from the group consisting of 1,1,1-trifluoroethane, 1,1-difluoroethane, trans-1-chloro-2-fluoroethylene, 1,1,2-trifluoroethane, the chloro-l, 2,2-trifluoroethane, l-chloro-2,2,2-trifluoroethane, cis-l-chloro-2-fluoroethylene, 1,2-dichloro-l-fluoroethylene, and l, l-dichloro- 2-fluoroethylene.

Thus, said composition may comprise:

• at least 40% by weight, preferably at least 50% by weight, preferably at least 60% by weight, in particular at least 80% by weight, more preferably at least 90% by weight, preferred at least 95% by weight of l-chloro-2,2-difluoroethane;

claims
1. Composition comprenant l-chloro-2,2-difluoroethane et au moins un composé additionnel sélectionné parmi le groupe consistant en 1,1-difluoroethylene, 1,1,1-trifluoroethane, chlorotrifluoroethylene, 1-chloro-l-fluoroethylene, 1,1-difluoroethane, trans-l-chloro-2-fluoroethylene, l-chloro-2,2,2-trifluoroethane, l-chloro-l,2,2-trifluoroethane, cis-l-chloro-2-fluoroethylene, 2,2-dichloro-l,l,l-trifluoroethane, 1,1-dichloro-l-fluorethane, 1,1-dichloroethylene, 1,2-dichloro-l-fluoroethylene, l,l-dichloro-2-fluoroethylene, 1,2-dichloro-1,1-difluoroethane, l,l-dichloro-2,2-difluorethane, cis-l,2-dichloroethylene, 1,2,2-trichloro-1,1-difluoroethane, 1,1,1-trichloroethane, 1,1-dichloroethane, 1,1,2-trichloro-l-fluroethane, trichloroethylene, l,l,2-trichloro-2-fluoroethane, 1,1,2-trichloroethane, 1,1,2,2-tetrachloro-l-fluoroethane, tetrachloroethylene, 1,1,1,2-tetrachloroethane, 1,1,2,2-tetrachloroethane, 1,1,1,2,2-pentachloroethane, tetrachloromethane, 1,2,2-trichloro-l-fluoroethylene, les isomères du chloropropène, 1,2-dichloro-l-fluoroethylene, l-chloro-2-fluoroethane, 1-chloro-1-fluoroethane, l,l-chloro-2,2,2-trifluoroethane, l,l,l-trichloro-2,2-difluoroethane, 1-chloroethylene, 1-fluoroethylene, H2O et HCI ; ladite composition comprenant au moins 30% en poids de l-chloro-2,2-difluoroethane sur base du poids total de la composition.

2. Composition according to the preceding claim comprising l-chloro-2,2-difluoroethane and at least one additional compound selected from the group consisting of 1,1-difluoroethylene, chlorotrifluoroethylene, 1-chloro-l-fluoroethylene, 1,1-difluoroethane , trans-l-chloro-2-fluoroethylene, l-chloro-2,2,2-trifluoroethane, l-chloro-l, 2,2-trifluoroethane, cis-1-chloro-2-fluoroethylene, 2,2-dichloro -l, l, l-trifluoroethane, 1,1-dichloro-l-fluoroethane, 1,2-dichloro-l-fluoroethylene, l, l-dichloro-2-fluoroethylene, l, 2-dichloro-l, l-difluoroethane , 1,1-dichloro-2,2-difluoroethane, cis-l, 2-dichloroethylene, l, 2,2-trichloro-l, l-difluoroethane, 1,1,1-trichloroethane, 1,1-dichloroethane, 1 , 1,2-trichloro-l-fluroethane, trichlorethylene, 1,1,2-trichloro-2-fluoroethane, 1,1,2,2-tetrachloro-l-fluoroethane, tetrachlorethylene, 1,1,1,2-tetrachloroethane , 1,1,2,2-tetrachloroethane, 1,1,1,2,2-pentachloroethane, tetrachloromethane, 1,2,2-trichloro-l-fluoroethylene, isomers of chloropropene, 1.2 dichloro-l-fluoroethylene, l-chloro-2-fluoroethane, 1-chloro-l-fluoroethane, l, l-chloro-2,2,2-trifluoroethane, l, l, l-trichloro-2,2-difluoroethane , 1-chloride-, 1-fluoroethylene, H2O and HCl; said composition comprising at least 30% by weight of l-chloro-2,2-difluoroethane based on the total weight of the composition.

3. A composition according to any preceding claim characterized in that it comprises at least 40% by weight of l-chloro-2,2-difluoroethane based on the total weight of the composition, preferably at least 50% by weight l-chloro-2,2-difluoroethane, preferably at least 60% by weight of l-chloro-2,2-difluoroethane, in particular at least 80% by weight of l-chloro-2,2-difluoroethane, more preferably at least 90% by weight of 1-chloro-2,2-difluoroethane, preferentially at least 95% by weight of l-chloro-2,2-difluoroethane.

4. Composition according to any one of the preceding claims characterized in that it comprises less than 5% by weight of said at least one additional compound based on the total weight of the composition, preferably less than 4% by weight of said at least one compound additional, preferably less than 3% by weight of said at least one additional compound, more preferably less than 2% by weight of said at least one additional compound, in particular less than 1% by weight of said at least one additional compound, more particularly less than 1000 ppm of said at least one additional compound based on the total weight of the composition.

5. Composition according to any one of the preceding claims characterized in that it also comprises one of the compounds selected from the group consisting of trans-1,2-dichloroethylene, 1,1,2-trifluoroethane and 1,2-dichloro- l-fluoroethane.

6. Composition according to any one of the preceding claims characterized in that it comprises l-chloro-2,2-difluoroethane, 1,1-dichloroethylene and optionally or not at least one additional compound selected from the group consisting of 1, 1-difluoroethylene, 1,1,1-trifluoroethane, chlorotrifluoroethylene, 1-chloro-l-fluoroethylene, 1,1-difluoroethane, trans-l-chloro-2-fluoroethylene, 1,1,2-trifluoroethane, l-chloro- 2,2,2-trifluoroethane, l-chloro-l, 2,2-trifluoroethane, cis-l-chloro-2-fluoroethylene, 2,2-dichloro-1,1,1-trifluoroethane, 1,1-dichloro- l-fluoroethane, 1,2-dichloro-l-fluoroethylene, 1,1-dichloro-2-fluoroethylene, l, 2-dichloro-l, l-difluoroethane, trans-l, 2-dichloroethylene, l, l-dichloro- 2,2-difluoroethane, cis-l, 2-dichloroethylene, l, 2,2-trichloro-l, l-difluoroethane, 1,2-dichloro-l-fluoroethane, 1,1,1-trichloroethane, 1,1- dichloroethane, 1,1,2-trichloroethane-the-fluroethane,

trichloroethylene, l,l,2-trichloro-2-fluoroethane, 1,1,2-trichloroethane, 1,1,2,2-tetrachloro-l-fluoroethane, tetrachloroethylene, 1,1,1,2-tetrachloroethane, 1,1,2,2-tetrachloroethane, 1,1,1,2,2-pentachloroethane, tetrachloromethane, 1,2,2-trichloro-l-fluoroethylene, les isomères du chloropropène, 1,2-dichloro-l-fluoroethylene, l-chloro-2-fluoroethane, 1-chloro-1-fluoroethane, l,l-chloro-2,2,2-trifluoroethane, l,l,l-trichloro-2,2-difluoroethane, 1-chloroethylene, 1-fluoroethylene et H2O.

7. A composition according to any preceding claim characterized in that it comprises l-chloro-2,2-difluoroethane, 1,1-dichloroethylene, trans-1,2-dichloroethylene and optionally at least one additional compound selected from the group consisting of 1,1-difluoroethylene, 1,1,1-trifluoroethane, chlorotrifluoroethylene, 1-chloro-l-fluoroethylene, 1,1-difluoroethane, trans-l-chloro-2-fluoroethylene, 1,1,2 trifluoroethane, l-chloro-2,2,2-trifluoroethane, l-chloro-l, 2,2-trifluoroethane, cis-l-chloro-2-fluoroethylene, 2,2-dichloro-l, l, l-trifluoroethane, 1,1-dichloro-l-fluoroethane, l-chloro-2,2-difluoroethane, 1,2-dichloro-l-fluoroethylene, l, l-dichloro-2-fluoroethylene, l, 2-dichloro-l, l- difluoroethane, l, l-dichloro-2,2-difluoroethane, cis-l, 2-dichloroethylene, l, 2,2-trichloro-l, l-difluoroethane, 1,2-dichloro-l-fluoroethane, 1,1, 1-trichloroethane, 1,1-dichloroethane, 1,1,2-trichloro-l-fluroethane, trichlorethylene, l, l, 2-trichloro-2-fluoroethane, 1,1,2-trichlorethylene roethane, 1,1,2,2-tetrachloro-l-fluoroethane, tetrachlorethylene, 1,1,1,2-tetrachloroethane, 1,1,2,2-tetrachloroethane, 1,1,1,2,2-pentachloroethane, tetrachloromethane, 1,2,2-trichloro-l-fluoroethylene, isomers of chloropropene, 1,2-dichloro-l-fluoroethylene, l-chloro-2-fluoroethane, 1-chloro-l-fluoroethane, l, l-chloro -2,2,2-trifluoroethane, l, l, l-trichloro-2,2-difluoroethane, 1-chloride-, 1-fluoroethylene and H2O.

8. A composition according to any preceding claim characterized in that it comprises l-chloro-2,2-difluoroethane, 1,1-dichloroethylene, trans-1,2-dichloroethylene, l-chloro-2,2, 2-trifluoroethane and 1,1,2-trifluoroethane.

9. Composition according to the preceding claim characterized in that it comprises at least 99.5% by weight of l-chloro-2,2-difluoroethane, less than 50 ppm of 1,1,2-trifluoroethane, less than 100 ppm l-chloro-2,2,2-trifluoroethane and less than 5000 ppm of trans-1,2-dichloroethylene and less than 50 ppm of 1,1-dichloroethylene.

10. Composition according to the preceding claim characterized in that it comprises less than 500 ppm O h, preferably less than 400 ppm of h ^ O, preferably less than 300 ppm O h, especially less than 100 ppm h ^ O, more preferably less than 10 ppm h 2 0.

11. Use of a composition according to any preceding claim as a starting material for the synthesis of 2,2-difluoroethylamine.

12. A process for preparing a compound of formula CF2CH2N HCH2A (I) comprising the steps of:

(A) providing a composition according to any one of claims 1 to 10,

(b) reacting the composition from step (a) and an amine of formula H2 ACH2N (II) to obtain the compound of formula CF2CH2N HCH2A (I) wherein A is selected from the group consisting of pyrid-2 radical yl, pyrid-4-yl or pyrid-3-yl optionally substituted in 6-position by fluorine, chlorine, bromine, methyl, trifluoromethyl or trifluoromethoxy, or is a radical pyridazin-3-yl optionally substituted in position 6 with a chlorine atom or a methyl radical, or is a radical pyrazin-3-yl, 2-chloropyrazin-5-yl or l, 3-thiazol-5-yl optionally substituted in position 2 by a chlorine atom or a methyl, or is a radical pyrimidinyl, pyrazolyl, Thiophenyl, oxazolyl, isoxazolyl, 1,2,4-oxadiazolyl, isothiazolyl, 1,2,4-triazolyl or 1,2,5-thiadiazolyl optionally substituted by a fluorine atom, chlorine, bromine, cyano, nitro, Ci-C 4 alkyl optionally substituted with F and / or Cl, Ci-C3-alkylthio optiona llement substituted by F and / or Cl, C 1 -C 3 alkylsulphonyl optionally substituted with F and / or Cl, or is a pyrid-3-yl of the formula

wherein X is F, Cl, Br, I, C 1 alkyl-C6, Ci-C6-haloalkyl; and Y is

F, Cl, Br, I, C1-C6 alkyle, Ci-C6-halogénoalkyle, Ci-C6-halogénoalkoxy, -N3, -CN.

13. Use of the composition according to any one of claims 1 to 10 as reagents for the synthesis of vinylidene fluoride and / or 1,2-difluoroethylene.

14. Use of the composition according to any one of claims 1 to 10 as foam or as a refrigerant expansion agent.

15. Use of the composition according to any one of claims 1 to 10 as a reagent or a synthesis intermediate for the preparation of 2,2-difluoroethanol or for the preparation of compounds comprising a functional group sulfone, ether, ester, methacrylate or preparing the éthyldifluorobromoacétate.