1. A container for shipping or long-term containment of tetrafluoroethylene (TFE), said container comprising a mixture of TFE and hexafluoropropylene (HFP), wherein both TFE and HFP are present in a gaseous form.

2. The container as claimed in claim 1, wherein the container is devoid of TFE and HFP in a liquid form.

3. The container as claimed in claim 1, wherein the mixture comprises less than 64 mol % TFE and more than 36 mol % of HFP in a gaseous form.

4. The container as claimed in claim 1, wherein the mixture comprises at least one auto-polymerization inhibitor selected from a group comprising a hydrocarbon thiol, an ethylene unsaturated hydrocarbon, a terpene hydrocarbon, and an aminohydrocarbon.

5. The container as claimed in claim 1, wherein an oxygen concentration in the container is less than 20 ppm.

6. The container as claimed in claim 1, wherein the mixture comprises Vinylidene-di-fluoride (VDF).

7. A process for storing or shipping tetrafluoroethylene (TFE), comprising: filling a container with a mixture of TFE and hexafluoropropylene (HFP), wherein both TFE and HFP are present in a gaseous form inside the container; and storing or shipping the container with the mixture of TFE and HFP being are present in the gaseous form.

8. The process as claimed in claim 7, wherein an amount of the mixture of TFE and HFP filled inside the container is such that an inside pressure of the container is in the range of 0to 40 bar.

9. The process as claimed in claim 7, wherein during filling, storing or shipping, the container is exposed to a temperature in the range of 10° C to 55° C.

10. A system for filling a container with a mixture of TFE and HFP in the gaseous form under pressure in the range of 0 to 40 bar within the container.

Description:FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
[See section 10, Rule 13]

STORING OF TETRAFLUOROETHYLENE

GUJARAT FLUOROCHEMICALS LIMITED, an Indian company of INOXGFL Towers, 17, Sector -16A, Noida – 201301 (UP), INDIA

THE FOLLOWING SPECIFICATION PARTICULARLY DESCRIBES THE INVENTION AND THE MANNER IN WHICH IT IS TO BE PERFORMED.

FIELD OF THE INVENTION:
[01] The present invention relates to storing and optionally of tetrafluoroethylene (TFE) in the form of a gaseous mixture comprising TFE and hexafluoropropylene (HFP).
BACKGROUND OF THE INVENTION:
[02] Tetrafluoroethylene (TFE) is a monomer used for manufacturing Fluoropolymers e.g PTFE, PFA, FEP, FKM etc. During the process of manufacturing, there may arise a requirement for storing and transporting TFE. It is well known that TFE has a tendency to ignite due to a variety of reasons for example, including the TFE undergoing auto-polymerization, which may be initiated by trace amounts of oxygen. Due to auto-polymerization, a temperature of the stored TFE can increase beyond “Minimum Ignition Temperature for Decomposition” (“MIDT”) which could lead to ignition. Thus, there exists a need to reduce the chances of ignition, by prohibiting / restricting auto-polymerization of TFE during storing and transporting.

[03] U.S. Pat. No. 2737533 discloses storing TFE with polymerization inhibitors. The polymerization inhibitors mentioned are amongst others α-pinene, di-pentene, camphene, α-terpinene, D-limonene, etc. These inhibitors are added to prevent the auto-polymerization of TFE.

[04] Yet another mechanism for preventing auto-polymerization is by storing an azeotrope mixture of gaseous TFE with gaseous hydrochloride. While an azeotrope mixture of gaseous TFE with gaseous hydrochlorides safe with respect to the prevention of explosions due dilution/inhibition, removal of HCl from the mixture is complicated and cumbersome. Additionally, use of HCl is hazardous as HCL is toxic to human being. Additionally, special types of equipments have to be used for safely handling HCl.

[05] U.S. Pat. No. 5345013 discloses an azeotrope comprising TFE and carbon di oxide in which is substantially protected against ignition. While an azeotrope comprising TFE and carbon di oxide is better than an azeotrope comprising TFE and gaseous hydrochloride, the CO2 still has to be separated from the TFE so that the TFE can be used as a monomer for making a fluoropolymer or for other chemical reaction. Additionally, removal of CO2 from the TFE is also complicated.

[06] U.S. Pat. No. 5866727 discloses shipping or storing a mixture of tetrafluoroethylene and hexafluoropropylene (HFP) in the form of a liquid mixture and in the form of a vapor mixture in a container. Ideally, liquid mixture must contain 35 mol % to 65 mol % of hexafluoropropylene. While, it is possible to ensure that at the beginning the liquid mixture contains 35 mol % to 65 mol % of hexafluoropropylene and the vapor mixture (which is present above the liquid mixture in the container) contains 35 mol % to 65 mol % of hexafluoropropylene, the same cannot be ensured either during filling of the container or when container is being unloaded. As a combination of tetrafluoroethylene and hexafluoropropylene is not an azeotropic mixture, when the liquid mixture containing 35 mol % to 65 mol % of hexafluoropropylene is being withdrawn, some of the vapor mixture will come in contact with liquid phase which could lead to decrease in temperature and hence, selective precipitation of HFP. The selective precipitation of HFP from the vapor mixture of tetrafluoroethylene and hexafluoropropylene could lead to a scenario wherein liquid mixture contains more than 65 mol % of hexafluoropropylene as well as the vapor mixture contains less than 35 mol% of hexafluoropropylene. Also, filling a container with a liquid mixture comprising tetrafluoroethylene and hexafluoropropylene and a vapor mixture comprising tetrafluoroethylene and hexafluoropropylene and which is devoid of air poses substantial practical challenges.

[07] Thus, there exists a need to safely store or ship TFE that addresses one or more of the aforesaid disadvantages.

SUMMARY OF THE INVENTION:
[08] This Summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

[09] Accordingly, the present invention provides a container for shipping or long-term containment of tetrafluoroethylene (TFE), said container comprising a mixture of TFE and hexafluoropropylene (HFP), wherein both TFE and HFP are present in a gaseous form.

[10] In an embodiment of the invention the container is devoid of TFE and HFP in a liquid form.

[11] In another embodiment of the invention, the mixture comprises less than 64 mol % TFE and more than 36 mol % of HFP in a gaseous form.

[12] In yet another embodiment of the invention, the mixture comprises less than 64 mol% of HFP in a gaseous form.

[13] In still another embodiment of the invention, the mixture comprises at least one auto-polymerization inhibitor selected from a group comprising a hydrocarbon thiol, an ethylene unsaturated hydrocarbon, a terpene hydrocarbon, and an amino hydrocarbon.

[14] In a further embodiment of the invention, the at least one auto-polymerization inhibitor is a terpene hydrocarbon.

[15] In a furthermore embodiment of the invention, the at least one auto-polymerization inhibitor is in gaseous form.

[16] In an embodiment of the invention, the at least one auto-polymerization inhibitor is present in an amount in the range of 10 to 100 ppm.

[17] In another embodiment of the invention, the mixture comprises vinylidene-di-fluoride.

[18] In yet another embodiment of the invention, the vinylidene-di-fluoride is in gaseous form.

[19] In still another embodiment of the invention, the vinylidene-di-fluoride is present in an amount in the range of 30 to 65 mol%.

[20] In a further embodiment of the invention, the mixture has less than 30 ppm of oxygen.

[21] The invention furthermore provides a process for storing and/or shipping tetrafluoroethylene (TFE), comprising: filling a container with a mixture of TFE and hexafluoropropylene (HFP), wherein both TFE and HFP are present in a gaseous form inside the container; and storing or shipping the container with the mixture of TFE and HFP being are present in the gaseous form.

[22] In an embodiment of the invention, an amount of the mixture of TFE and HFP filled inside the container is such that an inside pressure of the container is in the range of 0to 40 bar.

[23] In another embodiment of the invention, during filling, storing or shipping, the container is exposed to a temperature in the range of 10° C to 55° C.

[24] In yet another embodiment of the invention the container is adapted to be exposed to an internal pressure of less than 10 bar.

[25] The invention furthermore provides a system for filling a container with a mixture of TFE and HFP, wherein both TFE and HFP are present in a gaseous form inside the container. The system comprises a filling unit for filling the gaseous mixture under pressure in the range of 0 to 40 bar within the container.

[26] To further clarify the advantages and features of the invention, a more particular description of the invention will be rendered by reference to specific embodiments thereof, which is illustrated in the appended drawings. It is appreciated that these drawings depict only typical embodiments of the invention and are therefore not to be considered limiting of its scope. The invention will be described and explained with additional specificity and detail with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS:
[27] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate several embodiments of the invention and together with the description, serve to explain the principles of the invention.

[28] Figure1 shows a system for filing a TFE/HFP mixture into a container.

[29] It may be noted that to the extent possible, like reference numerals have been used to represent like elements in the drawings. Further, skilled artisans will appreciate that elements in the drawings are illustrated for simplicity and may not have been necessarily been drawn to scale. For example, the dimensions of some of the elements in the drawings may be exaggerated relative to other elements to help to improve understanding of aspects of the present invention. Furthermore, one or more elements may have been represented in the drawings by conventional symbols, and the drawings may show only those specific details that are pertinent to understanding the embodiments of the present invention so as not to obscure the drawings with details that will be readily apparent to those of ordinary skill in the art having the benefit of the description herein.

DETAILED DESCRIPTION OF THE INVENTION:
[30] For the purpose of promoting an understanding of the principles of the invention, reference will now be made to the embodiment illustrated in the drawings and specific language will be used to describe the same. It will nevertheless be understood that no limitation of the scope of the invention is thereby intended, such alterations and further modifications in the illustrated device, and such further applications of the principles of the invention as illustrated therein being contemplated as would normally occur to one skilled in the art to which the invention relates.

[31] It will be understood by those skilled in the art that the foregoing general description and the following detailed description are explanatory of the invention and are not intended to be restrictive thereof.

[32] As used in the description herein and throughout the claims that follow, the meaning of “a,” “an,” and “the” includes plural reference unless the context clearly dictates otherwise. Also, as used in the description herein, the meaning of “in” includes “in” and “on” unless the context clearly dictates otherwise.

[33] Reference throughout this specification to “an aspect”, “another aspect” or similar language means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, appearances of the phrase “in an embodiment”, “in another embodiment”, and similar language throughout this specification may, but do not necessarily, all refer to the same embodiment.

[34] The terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that one or more devices or sub-systems or elements or structures or components proceeded by "comprises... a" does not, without more constraints, preclude the existence of other devices or other sub-systems or other elements or other structures or other components or additional devices or additional sub-systems or additional elements or additional structures or additional components.

[35] As used herein, and unless the context dictates otherwise, the terms "coupled to", “connected to”, “operably connected to”, and “operatively connected to” are intended to include both direct connection / coupling (in which two elements that are coupled / connected to each other contact each other) and indirect coupling / connection (in which at least one additional element is located between the two elements). Therefore, the terms "coupled to" and "coupled with" are used synonymously. Similarly, the terms “connected to” and “connected with” are used synonymously.

[36] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one ordinary skilled in the art to which this invention belongs. The device, methods, and examples provided herein are illustrative only and not intended to be limiting.

[37] The use of any and all examples, or exemplary language (e.g. “such as”) provided with respect to certain embodiments herein is intended merely to better illuminate the invention and does not pose a limitation on the scope of the invention otherwise claimed. No language in the specification should be construed as indicating any non-claimed element as being essential to the practice of the invention.

[38] Groupings of alternative elements or embodiments of the invention disclosed herein are not to be construed as limitations. Each group member can be referred to and claimed individually or in any combination with other members of the group or other elements found herein. One or more members of a group can be included in, or deleted from, a group for reasons of convenience and/or patentability. When any such inclusion or deletion occurs, the specification is herein deemed to contain the group as modified thus fulfilling the written description of all Markush groups used in the appended claims.

[39] Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

[40] To solve one or more problems associated with the prior art, the present invention provides a container for shipping or long-term containment of tetrafluoroethylene (TFE), said container comprising a mixture of TFE and hexafluoropropylene (HFP), wherein both TFE and HFP are present in a gaseous form.

[41] In an embodiment of the invention the container is devoid of TFE and HFP in a liquid form.

[42] In another embodiment of the invention, the mixture comprises less than 64 mol % TFE and more than 36 mol % of HFP in a gaseous form.

[43] In yet another embodiment of the invention, the mixture comprises less than ___ (64) mol % of HFP in a gaseous form.

[44] In still another embodiment of the invention, the mixture comprises at least one auto-polymerization inhibitor selected from a group comprising a hydrocarbon thiol, an ethylene unsaturated hydrocarbon, a terpene hydrocarbon, and an amino hydrocarbon.

[45] In a further embodiment of the invention, the at least one auto-polymerization inhibitor is a terpene hydrocarbon.

[46] In a furthermore embodiment of the invention, the at least one auto-polymerization inhibitor is in gaseous form.

[47] In an embodiment of the invention, the at least one auto-polymerization inhibitor is present in an amount in the range of 10 to 100 ppm.

[48] In another embodiment of the invention, the mixture comprises vinylidene fluoride.

[49] In yet another embodiment of the invention, the vinylidene fluoride is in gaseous form.

[50] In still another embodiment of the invention, the vinylidene fluoride is present in an amount in the range of 30 to 65 mol%.

[51] In a further embodiment of the invention, the mixture has less than 30 ppm of oxygen.

[52] TFE boils at -75.6° C. and HFP boils at -29.4°C at atmospheric pressure (760 mm Hg, 101.3 kPa, absolute). These compounds can be mixed together as gases to form a homogeneous gaseous mixture in which the two compounds are fully miscible with one another. The gaseous/vaporized mixture can be stored in container and then transferred from one location to another. It has been found that when TFE in gaseous form is mixed with 50 % of HFP in gaseous form and stored in a container even at a pressure of 20 bar, the gaseous mixture comprising 50 % of HFP and 50 % of TFE does not undergo decomposition.

[53] In another embodiment, the most common ignition source to which the container of gaseous/vaporized mixture will be exposed is a localized hot spot generated by such sources as localized overheating due to auto-polymerization, possible spark discharge due to the buildup of static electricity, or an external heat source. The ignition test (Ignition Test) disclosed in the US 5345013 is used to simulate this exposure and thus to qualify safety from ignition during storage or shipping within the temperature range that might be encountered during storage or shipping, i.e. 10° C to 55° C. The data at various temperatures and with the TFE/ HFP gaseous/vaporized mixture containing varying amounts of HFP, the TFE/HFP vapor gives the following Ignition Test results. Since TFE is more volatile than HFP, the Ignition Test is conducted with the Nichrome® wire positioned within the vapor mixture of TFE/HFP. In summary, electrical current is passed through this resistance wire to cause the wire to fuse, indicating a temperature of 1350° C. Exposure of the vapor mixture to the fused wire is carried out for about one sec (includes the time the electrical current is turned on), before the wire melts, breaking the electrical circuit. The temperature of the vapor mixture will be the temperature within the range of 10° C to 55° C selected for the test and the pressure will be the pressure that is expected for the particular composition being tested and at the temperature of the test. Ignition is indicated by an increase in pressure and temperature within the container in which the test is conducted.

 
Table 1:

S. NO. Temperature (°C.)
Mol % HFP Pressure (kg/cm2 abs) Ignition
1 55 36 40.1 No
2 55 35 40.5 Yes
3 55 34 40.9 Yes
4 45 36 33.9 No
5 45 35 34.3 Yes
6 45 34 34.7 Yes
7 35 36 27.9 No
8 35 35 28.2 No
9 35 34 28.6 No
9 35 25 31.5 Yes
10 5 36 14.1 No
11 5 34 14.4 No
12 5 27 15.5 Yes

[54] From the above table it can be clearly concluded that whenever the gaseous mixture of TFE and HFP comprises more than 36 mol% of HFP, the gaseous mixture does not ignite when the temperature is in the range of 10 to 55o C and when the pressure is simultaneously less than 10 bars.

[55] In another embodiment, the proportion of HFP present in the gaseous/vaporized mixture is selected so that sufficient HFP is present in the vapor phase in the storage or shipping container to prevent the TFE in the vapor phase from igniting if or when exposed to intense heat as in the ignition test. It has been found that more than 36 mol % HFP present in the gaseous mixture is desirable. The mole percents of HFP disclosed herein are based on the mole percents of the HFP and TFE totaling 100 mol %.

[56] In another embodiment, as the vapor pressure in the vapor space increases from increasing temperature, however, the proportion of HFP in the vapor space also increases, providing greater safety from ignition of the TFE in the vapor space. The proportion of HFP in the gaseous/vaporized mixture can be very high, e.g. up to 99 mol %, but results in the shipment or storage of a relatively small amount of TFE, whereby the proportion of HFP in the gaseous/vaporized mixture is preferably no greater than 65 mol %. Preferably, at least 40 mol % of the gaseous/vaporized mixture is HFP and more preferably, 45 to 55 mol % of the gaseous/vaporized is HFP. The proportion of HFP in the gaseous/vaporized within the limits of providing safety from ignition can be selected so as to provide the proportion of TFE and HFP desired for chemical interaction after shipping or storage to form a fluorochemical such as perfluoropentene. Alternatively, less HFP can be present than desired for the chemical interaction, but sufficient for safe storage and shipping, and the extra HFP can be added at the location where the mixture is to be used in a chemical reaction. At the temperatures encountered during shipping or storage, no chemical interaction occurs between the TFE and HFP components of the mixture. If separate use of the TFE and HFP components is desired after shipping or storage of the gaseous/vaporized mixture, the TFE and HFP can be separated from one another by using conventional separation methods such as distillation.

[57] In another embodiment, more than 36 mol % HFP should be present in the gaseous/vaporized mixture because the critical temperature of the TFE/HFP mixture at about 34 mol % HFP concentration is about 55° C, which is a foreseeable maximum temperature to which the contents of the container might be exposed under normal conditions during shipping or storage. The more than 36 mol % HFP in the gaseous/vaporized mixture gives some margin of safety.

[58] In another embodiment, contains an alternative way of filling the trailer without the use of compressors. As well as an alternative way of emptying the trailer including a compression process without the traditional membrane compressor.

[59] In another embodiment, a mixture of TFE and HFP may further comprise Vinylidene-di-fluoride (VDF). Since, TFE, HFP and Vinylidene-di-fluoride are required for formation of Fluoro elastomer (FKM), if the intention is to use the mixture of TFE and HFP as present in the container to form Fluoro elastomer (FKM), then Vinylidene-di-fluoride can be added to the mixture of TFE and HFP in the storage container itself (instead of adding the same afterwards).

[60] In another embodiment, the spontaneous polymerization of tetrafluoroethylene occurs because of the presence, in the tetrafluoroethylene, of small quantities of oxygen, which initiate the polymerization of tetrafluoroethylene. Oxygen reacts with TFE toform TFE-Peroxide. TFE-Peroxide is an instable molecule that can initiate polymerization. It can also decompose violently if exposed to mechanical forces, it is shock-sensitive. In another embodiment, Oxygen reacts with the TFE to form TFE-peroxides, which subsequently decomposes into 2 free radicals that can trigger the polymerization chain reaction. There are two different ways to avoid this problem. In the first option, an amount of oxygen can be maintained less than 30 ppm, preferably less than 20 ppm. In the second option, at least one inhibitor could be added to the TFE + HFP gaseous mixture. In another embodiment, a mixture of TFE and HFP may further comprise inhibitors to prevent the premature polymerization of tetrafluoroethylene and more particularly stabilizing tetrafluoro ethylene against polymerization by addition of inhibitor compounds.

[61] In another embodiment, a compound will stabilize monomeric tetrafluoro ethylene, if the prevalent oxygen will react with that compound in preference to tetrafluoroethylene. Unsaturated compounds will react with oxygen at fast rates. As hereinabove mentioned, most of the compounds that react at rates faster than tetrafluoroethylene with oxygen have the serious disadvantage that they themselves form polymerization products or degradation products which are capable of polymerizing under the prevailing conditions. Accordingly, one of the achievements of the present invention is also finding a composition in which the inhibitor is capable of reacting with oxygen faster than does the tetrafluoroethylene, but in doing so the inhibitor does not form undesirable gums, being inherently inert against further reaction with its own species or with tetrafluoroethylene.

[62] In another embodiment, compounds heretofore described as inhibitors fall in general into the classes of hydrocarbon thiols, ethylene unsaturated hydrocarbons, and amino hydrocarbons. The most outstanding and most effective of the inhibitors for this purpose have been certain terpene hydrocarbons. The minimum concentration of terpene should be at least 20 ppm. While there is no limit to the maximum concentration, for all practical purposes, the maximum concentration of terpene can be kept below 100 ppm.

[63] In another embodiment, terpenes used as a polymerization inhibitor in the present invention include unsaturated hydrocarbons of the formula of C10H16. Examples thereof are monocyclic terpenes such as di-pentene, limonene, phellandrene, etc., dicyclic terpenes such as carane, pinene, camphene, etc., and olefine terpenes such as myrcene, etc. These terpenes can be used alone or in admixture with one another. Preferable example thereof is di-pentene, Limonene, and Terpinolene.

[64] In another embodiment, the present invention provides a trailer-mounted tubes container system for storing and transporting tetrafluoroethylene. The invention particularly focuses on a trailer-mounted system with multiple tubes for safe, efficient, and mobile storage (MEGC).

[65] Now coming to the process of storing or shipping tetrafluoroethylene (TFE), said process comprises filling a container with a mixture of TFE and hexafluoropropylene (HFP), wherein both TFE and HFP are present in a gaseous form inside the container; and storing or shipping the container with the mixture of TFE and HFP being are present in the gaseous form.

[66] Now referring to Figure 1, there is illustrated a system (100) for filling a mixture comprising TFE, hexafluoropropylene (HFP) and optionally an inhibitor and optionally VDF into a container (200), such that both TFE and HFP are present in a gaseous form inside the container (200). The system (100) comprises a first source (102) for supplying TFE, a second source (104) for supplying HFP, optionally a third source (106) for supplying an inhibitor and optionally a fourth source (108) for supplying VDF to a mixing unit (110). The first source supplies TFE in gaseous form, the second source supplies HFP in gaseous form, the third source supplies inhibitor in gaseous form and the fourth source supplies VDF in gaseous form to the mixing unit (110). The mixing unit (110) creates a gaseous mixture comprising TFE, hexafluoropropylene (HFP) and optionally an inhibitor and optionally VDF. The system comprises a filling unit (112) that fills the container with the gaseous mixture this formed. In particular, the filling unit (112) fills the container with the gaseous mixture such that a pressure level of the gas within the container is in the range of 0 to 40 bar. By way of a non-limiting example, the filling unit (112) may be in the form of a compressor that fills the container (200) with the gaseous mixture such that a pressure level of the gas within the container is in the range of 0 to 40 bar.

[67] The system (100) may optionally comprise an evacuating mechanism (114) which is configured to evacuate contents of the container (200) prior to the filling unit (112) filling the container (200) with the gaseous mixture thus formed. By way of a non-limiting example, the evacuating mechanism (114) can be in the form of a vacuum applying device. The system (100) may optionally comprise an inert gas supplying mechanism (116) which is configured to supply an inert gas to the container (200) prior to the filling unit (112) filling the container (200) with the gaseous mixture thus formed.

[68] This written description discloses the embodiments, including the best mode, and to enable a person of ordinary skill in the art to practice the embodiments. The claims define the patentable scope of the disclosure.
, Claims:We claim:

1. A container for shipping or long-term containment of tetrafluoroethylene (TFE), said container comprising a mixture of TFE and hexafluoropropylene (HFP), wherein both TFE and HFP are present in a gaseous form.

2. The container as claimed in claim 1, wherein the container is devoid of TFE and HFP in a liquid form.

3. The container as claimed in claim 1, wherein the mixture comprises less than 64 mol % TFE and more than 36 mol % of HFP in a gaseous form.

4. The container as claimed in claim 1, wherein the mixture comprises at least one auto-polymerization inhibitor selected from a group comprising a hydrocarbon thiol, an ethylene unsaturated hydrocarbon, a terpene hydrocarbon, and an aminohydrocarbon.

5. The container as claimed in claim 1, wherein an oxygen concentration in the container is less than 20 ppm.

6. The container as claimed in claim 1, wherein the mixture comprises Vinylidene-di-fluoride (VDF).

7. A process for storing or shipping tetrafluoroethylene (TFE), comprising:
filling a container with a mixture of TFE and hexafluoropropylene (HFP), wherein both TFE and HFP are present in a gaseous form inside the container; and
storing or shipping the container with the mixture of TFE and HFP being are present in the gaseous form.

8. The process as claimed in claim 7, wherein an amount of the mixture of TFE and HFP filled inside the container is such that an inside pressure of the container is in the range of 0to 40 bar.

9. The process as claimed in claim 7, wherein during filling, storing or shipping, the container is exposed to a temperature in the range of 10° C to 55° C.

10. A system for filling a container with a mixture of TFE and HFP in the gaseous form under pressure in the range of 0 to 40 bar within the container.