Description:FIELD OF THE INVENTION
[0001] The present disclosure relates to a catalyst composition for decomposing sulfur species. The present disclosure also discloses a method for preparation of a catalyst composition for decomposing sulfur species that can not only act as a catalyst for decomposing polysulfide to hydrogen sulfide and elemental sulfur, but it can also act as scavenging material to irreversibly consume liberated H2S to purify molten sulfur stream generated in the Clause process. The present disclosure also relates to a method of preparation of a combination of organic compounds for catalyst cum scavenging material to de-odorize sulfur pit. The present disclosure also relates to the application of said prepared compositions in the sulfur pit of Sulfur Recovery Unit (SRU).

BACKGROUND OF THE INVENTION
[0002] In the refinery, sulfur recovery unit converts H2S to elemental sulfur through Claus process and produced sulfur is stored in sulfur pit. During this process molten sulfur/elemental sulfur absorbs some amount of H2S and form both bonded (polysulfide) and un-bonded form of hydrogen sulfide. Typically, 200-400 ppmw of both bonded and un-bonded hydrogen sulfide are contaminated into the molten sulfur in the sulfur pit. Bonded form, which is called polysulfide, release H2S back with varied reaction rates depending on its available environment. Thus, both bonded form and un-bonded from of sulfide cause smell, health hazard and fire hazard while transportation of sulfur and thus it has to reduce to 10 ppmw level before commencing sulfur transportation. It is noteworthy to mention that un-bonded hydrogen sulfide could easily remove from molten sulfur by stripping gases such as nitrogen and air while the bonded form (hydrogen polysulfide), which is formed in the forward direction could not be easily removed in the same way and thus needs special reactive chemical to consume residual sulfide concertation in sulfur pit. Therefore, several catalytic systems have been developed using heterocyclic nitrogen based compounds or Lewis Base compound or mixture of various hetero cyclic compounds that are soluble in liquid sulfur in the temperature range of 125 oC to 180 oC. Several processes have been developed to purify liquid sulfur by removing hydrogen sulfide and hydrogen polysulfide using degassing agent comprises nitrogen hetero-atomic Lewis Base and in combination with primary amine.
[0003] ES2019394B3 discloses a process and a composition for removal of the H2S present in the liquid sulfur in the simply dissolved state and in the combined state of hydrogens polysulfides, wherein the scavenging catalyst can be quinoline.
[0004] IN 944/DEL/2001 discloses a catalyst system comprising a synergistic mixture of quinoline and butylamine for the purification of liquid sulphur by the removal of hydrogen sulphide and hydrogen polysulphide present therein.
[0005] US6416729B1 discloses a process and system wherein hydrogen sulfide is removed from a gaseous stream, using a non-aqueous scrubbing liquor which can be an organic solvent for elemental sulfur such as a phenylxylyl ethane in which are dissolved sulfur and a reaction-promoting amine base such as a tertiary amine which can be tri-n-butylamine.
[0006] US6416729B1 discloses a method of reducing the hydrogen sulfide content of industrial waste gases with the aid of a small amount of a compound in fluid phase which can be aliphatic amines such as sec-butylamine and using p-dioxane as solvent.
[0007] WO1995006616A1 discloses the degassing of liquid sulfur to remove hydrogen sulfide and hydrogen polysulfides using a stripping gas, which may be steam or air, as small bubbles in the liquid sulfur, in the presence of a strong Bronsted-Lowry base catalyst which can be morpholine or an aliphatic amine. Based on the several disclosures, it can be attributed that heterocyclic nitrogen base is generally being used for catalyst to decompose hydrogen polysulfide to hydrogen sulfide which is then formed complex with aliphatic amine compounds. In this regard, it is noteworthy to mention that such aliphatic amine -H2S complex (Acid-base) complex is susceptible for regeneration of H2S at the storage temperature (>130 oC) of molten sulfur and thus regenerated H2S can further react to molten sulfur to make polysulfide. This reversible reaction can hamper aspect of catalytic decomposition of polysulfide in presence of heterocyclic nitrogen-based catalyst. Here the liquid catalyst may be injected directly into the vortex of liquid sulfur formed inside the shroud.
Table 1: Various catalyst formulation to purify molten sulfur.

S.No References H2S/
Polysulfide Scavenging Solid/ Liquid Composition Result in detail

1. NPL 1
Y Liquid -
2. ES2019394B3
Y Liquid -
3. IN944/DEL/2001
Y Reduction of the total hydrogen sulphide and hydrogen polysulphide concentration in the degassed liquid sulphur to less than 10 ppm
4. US6416729B1
Y Liquid Reduction of the H2S content of the inlet gas from 1800 ppm to approximately 25 ppm
5. US3071433A

Y Liquid H2S decreased by 7-34%
6. WO1995006616A1
Y Liquid Residual H2S and H2SX levels below 5 ppmw

[0008] Based on the literature study given in Table-1, it is apparent that heterocyclic nitrogen compounds such as morpholine and quinoline, aliphatic amine such as tri-n-butyl amine or combination are employed as catalyst for remove H2S after stripping through nitrogen or inert gas. In case of ineffective stripping, catalytic effect may hamper due to regeneration of H2S gas from alkyl amine complex and lead to build up of H2S in the sulfur pit or any other molten storage area and may cause safety concerns. Thus, the chemical which can irreversibly consume H2S generated while decomposition of polysulfide can be suitable formulation for purifying molten sulfur in the sulfur pit. Cyanuric chloride is such chemical which is known for its H2S scavenging property and it was introduced as scavenging application in hydrocarbon sweeting process and the same was published in SPE International Symposium on Oilfield Chemistry (paper number SPE-141286-MS). However, such chemical was not tested for purifying molten sulfur. Therefore, polysulfide decomposition catalyst in combination with irreversibly H2S scavenging chemical material can be the most suitable composition for purifying molten sulfur in the SRU process.

OBJECTS OF THE INVENTION
[0009] The main objective of the present invention is to provide a catalyst composition for decomposing sulfur species.
[0010] Another objective of the present invention is to provide method of preparation of a catalyst composition for decomposing sulfur species.
[0011] It is another important object of the present invention to provide a methodology for preparing composition that purify molten sulfur from H2S or polysulfide stream.
[0012] It is another object of the present invention to provide a method rapidly de-odorize sulfur pit in irreversible manner.
[0013] It is yet another object of the present invention to obtain catalyst composition that can effectively reduce sulfide/polyslufide composition to <5 ppmw from >400 ppmw.

SUMMARY OF THE INVENTION
[0014] This summary is provided to introduce a selection of concepts in a simplified form that are further described below in Detailed Description section. This summary is not intended to identify key features 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.
[0015] The present disclosure discloses a catalyst composition for decomposing sulfur species comprising: 50-70 w/w % of an aliphatic heterocyclic amine; 15-40 w/w % of an aromatic heterocyclic amine; 5-15 w/w % of an aliphatic amine; 5-10 w/w % of a cyclic ether; and 1-5 w/w % of a chlorinated compound.
[0016] The present disclosure also discloses a method of preparation of a catalyst composition for decomposing sulfur species comprising: contacting an aliphatic heterocyclic amine with an aromatic heterocyclic amine to obtain a solution A; contacting a chlorinated compound with an aliphatic amine and a cyclic ethers to obtain a solution B; and contacting the solution B with the solution A to obtain a catalyst composition, wherein the composition comprises: aliphatic heterocyclic amine in the range of 50-70 w/w %; the aromatic heterocyclic amine in the range of 15-40 w/w %; the aliphatic amine in the range of 5-15 w/w %; the cyclic ether in the range of 5-10 w/w % and the chlorinated compound in the range of 1-5 w/w %.
[0017] Various objects, features, aspects and advantages of the inventive subject matter will become more apparent from the following detailed description of preferred embodiments.

BRIEF DISCRIPTION OF THE DRAWINGS
[0018] FIG. 1 1H NMR spectra for catalyst composition after H2S exposure and before H2S exposure.

DETAILED DESCRIPTION OF THE INVENTION
[0019] The following is a detailed description of embodiments of the disclosure. The embodiments are in such detail as to clearly communicate the disclosure. However, the amount of detail offered is not intended to limit the anticipated variations of embodiments; on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the present disclosure as defined by the appended claims.
[0020] Unless the context requires otherwise, throughout the specification which follow, the word “comprise” and variations thereof, such as, “comprises” and “comprising” are to be construed in an open, inclusive sense that is as “including, but not limited to.”
[0021] As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” include plural referents unless the content clearly dictates otherwise. It should also be noted that the term “or” is generally employed in its sense including “and/or” unless the content clearly dictates otherwise.
[0022] In some embodiments, the numbers expressing quantities of ingredients, properties such as concentration, reaction conditions, and so forth, used to describe and claim certain embodiments of the invention are to be understood as being modified in some instances by the term “about.” Accordingly, in some embodiments, the numerical parameters set forth in the written description are approximations that can vary depending upon the desired properties sought to be obtained by a particular embodiment. In some embodiments, the numerical parameters should be construed in light of the number of reported significant digits and by applying ordinary rounding techniques. Notwithstanding that the numerical ranges and parameters setting forth the broad scope of some embodiments of the invention are approximations, the numerical values set forth in the specific examples are reported as precisely as practicable.
[0023] The recitation of ranges of values herein is merely intended to serve as a shorthand method of referring individually to each separate value falling within the range. Unless otherwise indicated herein, each individual value is incorporated into the specification as if it is individually recited herein.
[0024] All processes described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. 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 essential to the practice of the invention.
[0025] The headings and abstract of the invention provided herein are for convenience only and do not interpret the scope or meaning of the embodiments.
[0026] The following discussion provides many example embodiments of the inventive subject matter. Although each embodiment represents a single combination of inventive elements, the inventive subject matter is considered to include all possible combinations of the disclosed elements. Thus if one embodiment comprises elements A, B, and C, and a second embodiment comprises elements B and D, then the inventive subject matter is also considered to include other remaining combinations of A, B, C, or D, even if not explicitly disclosed.
[0027] All publications herein are incorporated by reference to the same extent as if each individual publication or patent application were specifically and individually indicated to be incorporated by reference. Where a definition or use of a term in an incorporated reference is inconsistent or contrary to the definition of that term provided herein, the definition of that term provided herein applies and the definition of that term in the reference does not apply.
[0028] 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 that follows, and the embodiments described herein, is provided by way of illustration of an example, or examples, of particular embodiments of the principles and aspects of the present disclosure. These examples are provided for the purposes of explanation, and not of limitation, of those principles and of the disclosure.
[0029] It should also be appreciated that the present invention can be implemented in numerous ways, including as a system, a method or a device. In this specification, these implementations, or any other form that the invention may take, may be referred to as processes. In general, the order of the steps of the disclosed processes may be altered within the scope of the invention.
[0030] Various terms as used herein are shown below. To the extent a term used in a claim is not defined below, it should be given the broadest definition persons in the pertinent art have given that term as reflected in printed publications and issued patents at the time of filing.
[0031] An embodiment of the present disclosure discloses a catalyst for decomposing sulfur species comprising: 50-70 w/w % of an aliphatic heterocyclic amine; 15-40 w/w % of an aromatic heterocyclic amine; 5-15 w/w % of an aliphatic amine; 5-10 w/w % of a cyclic ether; and 1-5 w/w % of a chlorinated compound.
[0032] Another embodiment of the present disclosure, the aliphatic heterocyclic amine selected from a group consisting of morpholine, pyrrolidine, piperidine and piperazine.
[0033] Another embodiment of the present disclosure, the aromatic heterocyclic amine selected from a group consisting of quinoline, pyridine, pyrazine, quinoline, isoquinoline, imidazole, purine and pyrimidine.
[0034] Another embodiment of the present disclosure, the aliphatic amine selected from a group consisting of n-butyl amine, n-pentyl amine, n-hexyl amine, n-heptyl amine, n-octyl amine, di-n-propyl amine, di-n-butyl amine, di-n-pentyl amine, tri-n-butyl amine and mixture thereof.
[0035] Another embodiment of the present disclosure, the cyclic ethers selected from a group consisting of 1,4-dioxane, tetrahydro furan, oxetane and oxirane.
[0036] Another embodiment of the present disclosure, the chlorinated compound selected from a group consisting of cyanuric chloride, trichloro-S-triazinetrione and mixture thereof.
[0037] Another embodiment of the present disclosure, the catalyst composition comprises 60- 65 w/w % of an aliphatic heterocyclic amine, 25-30 w/w % of an aromatic hetero-cyclic amine, 5-7 w/w % of an aliphatic amine, 5-7 w/w % of a cyclic ether and 1-5 w/w % of a chlorinated compound.
[0038] Another embodiment of the present disclosure, the sulfur species comprises H2S and polysulfide.
[0039] Yet another embodiment of the present disclosure discloses a method of preparation of a catalyst composition for decomposing sulfur species comprising: contacting an aliphatic heterocyclic amine with an aromatic heterocyclic amine to obtain a solution A; contacting a chlorinated compound with an aliphatic amine and a cyclic ethers to obtain a solution B; and contacting the solution B with the solution A to obtain a catalyst composition, wherein the composition comprises: aliphatic heterocyclic amine in the range of 50-70 w/w %; the aromatic heterocyclic amine in the range of 15-40 w/w %; the aliphatic amine in the range of 5-15 w/w %; the cyclic ether in the range of 5-10 w/w % and the chlorinated compound in the range of 1-5 w/w %.
[0040] Another embodiment of the present disclosure, the preparation of the catalyst composition is carried out at a temperature in the range of 20-35°C and atmospheric pressure.
[0041] An embodiment of the present disclosure relates to the method of preparing catalyst composition comprises hetero cyclic aromatic amines for polysulfide decomposition at higher temperature as these compounds are high boiling in nature, aliphatic hetero cyclic amine for poly sulfide decomposition relatively at low temperature, aliphatic amines for capturing un-bonded H2S in molten sulfur, cyclic ether solvent to solubilize molten sulfur and its corresponding polysulfide to increase the catalytic efficiency and finally irreversible scavenger such as cyanuric chloride & or trichloro-S-triazinetrione to increase catalytic efficiency further.
[0042] The present invention relates to provide method for liquid catalyst injection directly into the vortex of liquid sulfur formed inside the shroud to purify H2S in molten sulfur as this method is most suitable for purifying H2S in sulfur pit.
[0043] The present invention describes a method for preparation of liquid catalyst comprising various proportion of hetero cyclic aromatic/aliphatic amines, aliphatic amines, cyclic ether and cyanuric chloride & or trichloro-S-triazinetrione. Since the Pkb value of (6-7) heterocyclicaliphatic amine such as morpholine (Pkb ~ 6) is more suitable for polysulfide decomposition than heterocyclic aromatic amine such as quinoline higher percentage of aliphatic heterocyclic amine is used for this present invention. However, in order to be effective of such heterocyclic amines for polysulfide decomposition at faster rate <1 hour both aliphatic amines and irreversible scavengers are required as given in example 1-4.
[0044] The present invention provides a method for preparing catalyst composition comprising 50-70 w/w % of aliphatic heterocyclic amine, 15-40 w/w% aromatic heterocyclic amine, 5-15 w/w% of aliphatic amine, 5-10 w/w% of cyclic ethers and 1-5 w/w% of cyanuric chloride or trichloro-S-triazinetrione. Most preferable composition is made of 60-65 w/w% of aliphatic heterocyclic amine, 25-30 w/w% of aromatic hetero-cyclic amine, 5-7 w/w% of aliphatic amine, 5-7 w/w% of cyclic ether and 1-5 w/w% cyanuric chloride and ortrichloro-S-triazinetrione that can reduce H2S concentration from 510 ppmw to < 10ppmw in liquid sulfur by using 510 ppmw of catalyst solution as given in example 1-5.
[0045] The present invention also relates to provides a method to determine the catalytic efficiency of developed liquid catalyst compositions by adopting procedure given by Tari et al in Int. J. Environ. Sci. Technol. (2019) 16:1691–1700 liquid catalyst is employed instead of nano-silica and efficiency is determined at 130 oC-150 oC for 1 hour time duration.
[0046] The present invention also relates to demonstrate the importance of irreversible scavenger in polysulfide decomposition amine-catalyst by determining efficiency of various catalyst compositions comprising cyanuric chloride or excluding cyanuric chloride as per Table 2.
[0047] The present invention relates to characterize catalyst composition using 600 MHz 1H NMR spectroscopy and identify the characteristics peaks at different chemical shift of the spectrum to understand the effect of various amine components after and before exposing H2S in molten sulfur stream (Fig. 1)
[0048] The present invention relates to a method for preparing various composition of liquid catalyst sourcing from heterocyclic amines comprises at least one hetero cyclic aromatic/aliphatic amine or both; aliphatic amine compound comprises at least tertiary amine such as tri-n-butyl amine or mixture of primary, secondary and tertiary amines; irreversible H2S scavenger comprises cyanuric chloride and or trichloro-S-triazinetrione dissolved in cyclic ether solvents such tetrahydro furan, dioxane and so on.
[0049] In one embodiment the present invention relates to provide method for liquid catalyst injection directly into the vortex of liquid sulfur formed inside the shroud.
[0050] In still another embodiment the present invention provides a method for preparing a liquid catalyst composition comprises various proportions of heterocyclic aromatic or aliphatic amines, aliphatic tertiary amine or mixture of primary, secondary & tertiary amines and finally irreversible H2S scavenger solution made of different proportion of cyanuric chloride dissolved in cyclic ether solvents.
[0051] In another embodiment the present invention provides a method for preparing catalyst composition wherein weight percentage range of aromatic heterocyclic amine, aliphatic hetero cyclic amine, aliphatic amine, cyclic ethers and irreversible H2S scavenger such as cyanuric chloride or trichloro-S-triazinetrione remains as 50-70 w/w%, 15-40 w/w%, 5-15 w/w%, 5-10 w/w% and 1-5 w/w% respectively.
[0052] In still another embodiment the present invention provides a method for preparing catalyst composition that can reduce H2S concentration from 510 ppmw to <5 ppmw in liquid sulfur by using 510 ppmw of catalyst solution.
[0053] In another embodiment the present invention provides a method to determine the catalytic efficiency of developed liquid catalyst composition by adopting procedure given by Tari et al in Int. J. Environ. Sci. Technol. (2019) 16:1691–1700 wherein nano-silica was used for removal of H2S from Claus-derived molten sulfur. However, in this embodiment, liquid catalyst is employed instead of nano-silica.
[0054] In still another embodiment the present invention provides a method determining catalytic efficiency at 130 oC to 150 oC for 1 hour time duration.
[0055] In yet another embodiment the present invention relates to characterized catalyst composition after H2S exposure and before H2S exposure to understand the role of irreversible scavenger in H2S removal catalyst composition.
[0056] The following examples are provided to illustrate the invention and are not to be construed as limiting thereof.
[0057] While the foregoing describes various embodiments of the disclosure, other and further embodiments of the disclosure may be devised without departing from the basic scope thereof. The scope of the invention is determined by the claims that follow. The invention is not limited to the described embodiments, versions or examples, which are included to enable a person having ordinary skill in the art to make and use the invention when combined with information and knowledge available to the person having ordinary skill in the art.
[0058] While the foregoing describes various embodiments of the disclosure, other and further embodiments of the disclosure may be devised without departing from the basic scope thereof. The invention is not limited to the described embodiments, versions or examples, which are included to enable a person having ordinary skill in the art to make and use the invention when combined with information and knowledge available to the person having ordinary skill in the art.
EXAMPLES
[0059] The present invention is further explained in the form of following examples. However, it is to be understood that the following examples are merely illustrative and are not to be taken as limitations upon the scope of the invention.
Example 1:
[0060] Preparation of solution A: 60 w/w % of morpholine was taken into the container fitted with mechanical stirrer. Then 25 w/w% of quinoline was added with continuous stirring.
[0061] Preparation of Solution B: In a separate container 3 w/w % of cyanuric chloride (avoid water in the container as it may generate fumes) was taken and then 5 w/w % of 1,4-dioxane and 7 w/w % of tri-n-butyl amine were added with continuous stirring till clear solution was formed.
[0062] Final blend preparation: Prepared solution B was slowly added to the solution A with continuous stirring till the pale-yellow liquid solution was formed. This catalyst composition was labeled as Scat-1.
Example 2
[0063] Preparation of solution A: 63 w/w% of morpholine was taken into the container fitted with mechanical stirrer. Then 25 w/w% of quinoline was added with continuous stirring.
[0064] Preparation of Solution B: In a separate container 1 w/w% of cyanuric chloride (avoid water in the container as it may generate fumes) was taken and then 5 w/w % of 1,4-dioxane and 6 w/w % of equimolecular mixture of n-butyl amine, di-n-butyl amine & tri-n-butyl amine were added with continuous stirring till clear solution was formed.
[0065] Final blend preparation: Prepared solution B was slowly added to the solution A with continuous stirring till the pale-yellow liquid solution was formed. This catalyst composition was labeled as Scat-2.
Example 3
[0066] Preparation of solution A: 50 w/w % of morpholine was taken into the container fitted with mechanical stirrer. Then 30 w/w % of quinoline was added with continuous stirring.
[0067] Preparation of Solution B: In a separate container 5 w/w % of cyanuric chloride (avoid water in the container as it may generate fumes) was taken and then 7 w/w % of 1,4-dioxane and 8 w/w % of equimolar mixture of n-butyl amine, di-n-butyl amine and tri-n-butyl amine were added with continuous stirring till clear solution was formed.
[0068] Final blend preparation: Prepared solution B was slowly added to the solution A with continuous stirring till the pale-yellow liquid solution was formed. This catalyst composition was labeled as Scat-3.
Example 4
[0069] 60 w/w % of morpholine was taken into the container fitted with mechanical stirrer. Then 30 w/w % of quinoline was added with continuous stirring. Finally, 10 w/w % of equimolar mixture of n-butyl amine, di-n-butyl amine, and tri-n-butyl amine was added to the container to make final blend of pale-yellow color. This catalyst composition was labeled as Scat-4.
Example 5
[0070] 60 w/w % of morpholine was taken into the container fitted with mechanical stirrer. Then 30 w/w % of quinoline was added with continuous stirring. Finally, 5w/w % of equimolar mixture of n-butyl amine, di-n-butyl amine, and tri-n-butyl amine and 5 w/w % of dioxane were added to the container with continuous stirring till the clear pale-yellow solution was obtained. This catalyst composition was labeled as Scat-5.
Table 2: Catalytic efficiency of various compositions at plant mimic condition (testing was performed as per procedure given in by Tari et al in Int. J. Environ. Sci. Technol. (2019) 16:1691–1700). H2S has been analyzed using GC-SCD.

Example Catalyst H2S (ppmw)
Conc (Initial) Final H2S cocn (ppmw) Duration
in hour Temperature / oC
1 Scat-1 510 < 5 1 130
10 1 150
2 Scat-2 510 25 1 130
30 1 150
3 Scat-3 510 20 1 130
25 1 150
4 Scat-4 510 60 1 130
60 1 150
5 Scat-5 510 40 1 130
45 1 150

[0071] A skilled artisan will appreciate that the quantity and type of each ingredient can be used in different combinations or singly. All such variations and combinations would be falling within the scope of present disclosure.
[0072] The foregoing examples are merely illustrative and are not to be taken as limitations upon the scope of the invention. Various changes and modifications to the disclosed embodiments will be apparent to those skilled in the art. Such changes and modifications may be made without departing from the scope of the invention.
, Claims:1. A catalyst composition for decomposing sulfur species comprising:
50-70 w/w % of an aliphatic heterocyclic amine;
15-40 w/w % of an aromatic heterocyclic amine;
5-15 w/w % of an aliphatic amine;
5-10 w/w % of a cyclic ether; and
1-5 w/w % of a chlorinated compound.
2. The composition as claimed in claim 1, wherein the aliphatic heterocyclic amine selected from a group consisting of morpholine, pyrrolidine, piperidine and piperazine.
3. The composition as claimed in claim 1, wherein the aromatic heterocyclic amine selected from a group consisting of quinoline, pyridine, pyrazine, quinoline, isoquinoline, imidazole, purine and pyrimidine.
4. The composition as claimed in claim 1, wherein the aliphatic amine selected from a group consisting of n-butyl amine, n-pentyl amine, n-hexyl amine, n-heptyl amine, n-octyl amine, di-n-propyl amine, di-n-butyl amine, di-n-pentyl amine, tri-n-butyl amine and mixture thereof.
5. The composition as claimed in claim 1, wherein the cyclic ethers selected from a group consisting of 1,4-dioxane, tetrahydro furan, oxetane and oxirane.
6. The composition as claimed in claim 1, wherein the chlorinated compound selected from a group consisting of cyanuric chloride, trichloro-S-triazinetrione and mixture thereof.
7. The composition as claimed in claim 1, wherein the composition comprises 60- 65 w/w % of an aliphatic heterocyclic amine, 25-30 w/w % of an aromatic hetero-cyclic amine, 5 – 7 w/w % of an aliphatic amine, 5-7 w/w % of a cyclic ether and 1-5 w/w % of a chlorinated compound.
8. The composition as claimed in claim 1, wherein the sulfur species comprises H2S and polysulfide.
9. A method of preparation of a catalyst composition for decomposing sulfur species comprising:
contacting an aliphatic heterocyclic amine with an aromatic heterocyclic amine to obtain a solution A;
contacting a chlorinated compound with an aliphatic amine and a cyclic ethers to obtain a solution B; and
contacting the solution B with the solution A to obtain a catalyst composition,
wherein the composition comprises: aliphatic heterocyclic amine in the range of 50-70 w/w %; the aromatic heterocyclic amine in the range of 15-40 w/w %; the aliphatic amine in the range of 5-15 w/w %; the cyclic ether in the range of 5-10 w/w % and the chlorinated compound in the range of 1-5 w/w %.
10. The method as claimed in claim 9, wherein the preparation of the catalyst composition is carried out at a temperature in the range of 20-35°C and atmospheric pressure.