Process for the conversion of polysulfanes
The invention provides a process for the removal of polysulfanes from gas streams formed during H 2 S synthesis.
1. A process for obtaining a purified gas by removing polysulfanes from crude gas formed during the production of hydrogen sulfide, comprising:
a) passing said crude gas through a wash system where said crude gas is brought into contact with a wash solution comprising water or methanol; and
b) collecting said purified gas from the wash solution of step a).
2. The process of claim 1 , wherein said crude gas comprises 1-80% H 2 S by volume.
3. The process of claim 1 , wherein said crude gas comprises greater than 100 to 2000 vpm of polysulfanes of the formula H 2 S n , wherein n=2-8.
4. The process of claim 1 , wherein said crude gas is formed during the production of hydrogen sulfide from sulfur and hydrogen.
5. The process of claim 1 , wherein said wash system is a jet washer.
6. The process of claim 1 , further comprising a second wash step in which the purified gas produced in step a) is passed through a counter-current washer comprising an aqueous or methanolic solution.
7. The process of claim 1 , further comprising a second wash step in which the purified gas produced in step a) is passed through an adsorber bed.
8. The process of claim 1 , wherein relative to said crude gas, the polysulfanes in said purified gas have been reduced by 50-99.5%.
9. The process of claim 1 , wherein said process is carried out at a temperature of 0-150° C.
10. A process for obtaining a purified gas by removing polysulfanes from crude gas formed during the production of hydrogen sulfide, comprising:
a) passing said crude gas through a wash system comprising an aqueous or methanolic solution containing 0.5-20 wt% of an alkali or alkaline earth hydroxide or oxide; and
b) collecting said purified gas from the aqueous or methanolic solution of step a).
11. The process of claim 10 , wherein said crude gas comprises 1-80% H 2 S by volume.
12. The process of claim 10 , wherein said crude gas comprises greater than 100 to 2000 vpm of polysulfanes of the formula H 2 S n , wherein n=2-8.
13. The process of claim 10 , wherein said crude gas is formed during the production of hydrogen sulfide from sulfur and hydrogen.
14. The process of claim 10 , wherein relative to said crude gas, the polysulfanes in said purified gas have been reduced by 50-99.5%.
15. The process of claim 10 , wherein said wash system is a jet washer and said process further comprises a second wash step in which the purified gas of step a) is passed through either: a counter-current washer comprising an aqueous or methanolic solution; or an adsorber bed.
16. A process for obtaining a purified gas by removing polysulfanes from crude gas formed during the production of hydrogen sulfide, comprising:
a) passing said crude gas through a wash system comprising an aqueous or methanolic solution containing 1-20 wt% of a compound selected from the group consisting of:
i) a compound of the formula (C n H 2n+1 ) x NH y , where n =1-3, x =2 or 3, and y =0 or 1;
ii) a compound of formula (C n H 2n+1 O) x NH y , where n =1-3, x =2 or 3, and y =0 or 1; and
iii) ammonia;
b) collecting said purified gas from the aqueous or methanolic solution of step a).
17. The process of claim 16 , wherein said compound comprises the formula (C n H 2n+1 ) x NH y , where n =1-3, x =2 or 3, and y =0 or 1.
18. The process of claim 16 , wherein said crude gas comprises greater than 100 to 2000 vpm of polysulfanes of the formula H 2 S n, wherein n=2-8.
19. The process of claim 16 , wherein said compound is formula (C n H 2n+1 O) x NH y , where n =1-3, x =2 or 3, and y =0 or 1.
20. The process of claim 16 , wherein said compound is ammonia.
21. The process of claim 16 , wherein said crude gas is formed during the production of hydrogen sulfide from sulfur and hydrogen.
22. The process of claim 16 , wherein relative to said crude gas, the polysulfanes in said purified gas have been reduced by 50-99.5%
23. The process of claim 16 , wherein said wash system is a jet washer and said process further comprises a second wash step in which the purified gas of step a) is passed through either: a counter-current washer comprising an aqueous or methanolic solution; or an adsorber bed.