PROCESS TO PREPARE LOW CARBON DISULFIDE CONTAINING DIMETHYL SULFIDE

• US 20030205134A1
• Filed: 05/01/2002
• Published: 11/06/2003
• Est. Priority Date: 05/01/2002
• Status: Active Grant

• Current Assignee: Chevron Phillips Chemical Company LP (Chevron Corp.)
• Original Assignee: Chevron Phillips Chemical Company LP (Chevron Corp.)
• Inventors: Zisman, Stan A., Refvik, Mitchell D., Hasenberg, Dan M.
• Granted Patent: US 6,736,879 B2
• Time in Patent Office: Days
• US Class Current: 95/135
• CPC Class Codes: B01D 2253/104 Alumina
• CPC Class Codes: B01D 2253/106 Silica or silicates
• CPC Class Codes: B01D 2257/30 Sulfur compounds
• CPC Class Codes: B01D 2257/306 Organic sulfur compounds, e.g. mercaptans
• CPC Class Codes: B01D 2257/308 Carbonoxysulfide COS
• CPC Class Codes: B01D 2259/4009 using hot gas
• CPC Class Codes: B01D 53/02 by adsorption, e.g. preparative gas chromatography solid sorbent compositions B01J20/00, preparation of inorganic compounds or elements C01
• CPC Class Codes: B01D 53/04 with stationary adsorbents B01D53/025 takes precedence

Abstract

An adsorption method is disclosed for removal of acid gas from a sulfur compound stream. The method relates to a novel process to remove acid gas from a sulfur compound stream by adsorption on an adsorption media adsorbent followed by regeneration of the adsorption media after the adsorption capacity has been reached. The adsorption media comprises an activated alumina, which has been previously treated with one or more alkali metal compounds, one or more alkaline earth metal compounds, or a mixture thereof; and then regenerating the adsorbent after the adsorption capacity has been reached.

Claims

1. A process to remove acid gas from a sulfur compound stream, said process comprises adsorbing said acid gas in an adsorption zone to remove a portion of said acid gas from said sulfur compound stream to produce a low acid gas sulfur product.

2. A process according to claim 1 wherein a wet sulfur compound stream is dried in a drying zone to remove a portion of said moisture from said wet sulfur compound stream to produce said sulfur compound stream.

3. A process according to claim 1 wherein said sulfur compound stream is selected from the group consisting of sulfides, disulfides, and mercaptans.

4. A process according to claim 1 wherein said sulfur compound stream is selected from the group consisting of dimethylsulfide, diethylsulfide, dimethyldisulfide, methyl ethyl sulfide, methyl isopropyl sulfide, methyl mercaptan, and ethyl mercaptan.

5. A process according to claim 3 wherein said mercaptan compounds have a chemical formula of R—

S—

H, wherein R is a hydrocarbon radical having 1 to 12 carbon atoms.

6. A process according to claim 1 wherein said adsorption zone is regenerated with a hot gas to produce an acid gas rich stream.

7. A process according to claim 1 wherein said acid gas is at least one compound selected from the group consisting of H₂S, CO₂, COS, and CS₂.

8. A process according to claim 1 wherein said acid gas is CS₂.

9. A process to claim 5 wherein said regeneration temperature is in a range of about 200°

C. to about 300°

C.

10. A process according to claim 1 wherein said low acid gas sulfur product has an acid gas concentration of less than 10 ppmw.

11. A process according to claim 3 wherein said sulfur compound stream is selected from the group consisting of dimethylsulfide and methyl mercaptan.

12. A process according to claim 1 wherein said adsorption zone comprises an activated alumina adsorbent.

13. A process according to claim 12 wherein said activated alumina adsorbent has been previously treated with one or more alkali metal compounds, one or more alkaline earth metal compounds, or a mixture thereof.

14. A process according to claim 12 wherein said activated alumina has been previously treated with caustic.

15. A process according to claim 1 wherein said adsorption zone comprises silica adsorbents.

16. A process according to claim 1 wherein said adsorption zone comprises zinc oxides adsorbents.

17. A process according to claim 5 wherein said regenerating of said adsorption zone occurs when the adsorption capacity has been reached.

18. A process to remove CS₂ from a sulfur compound stream, said process comprising adsorbing said CS₂ in an adsorption zone to remove a portion of CS₂ from said sulfur compound stream to produce a low CS₂ sulfur product.

19. A process according to claim 18 wherein a wet sulfur compound stream is dried in a drying zone to remove a portion of said moisture from said wet sulfur compound stream to produce said sulfur compound stream.

20. A process according to claim 18 wherein said sulfur compound stream is selected from the group consisting of sulfides, disulfides, or thiols (mercaptans).

21. A process according to claim 18 wherein said sulfur compound stream is selected from the group consisting of DMS, DES, DMDS, MES, methyl isopropyl sulfide, methyl mercaptan, or ethyl mercaptan.

22. A process according to claim 20 wherein said mercaptan compounds have a chemical formula of R—

S—

H, wherein R is a hydrocarbon radical having 1 to 12 carbon atoms.

23. A process according to claim 18 wherein said adsorption zone is regenerated with a regeneration gas to produce a CS₂ rich stream wherein said regeneration gas is selected from the group consisting of nitrogen and natural gas.

24. A process according to claim 23 wherein said natural gas has an acid gas content of up to 0.5 wt %.

25. A process according to claim 23 wherein said regeneration temperature is in a range of about 200°

C. to about 300°

C.

26. A process according to claim 18 wherein said low CS₂ sulfur product has a CS₂ concentration of less than 0.25 wt %.

27. A process according to claim 20 wherein said sulfur compound stream is selected from the group consisting of dimethylsulfide and methyl mercaptan.

28. A process according to claim 18 wherein said adsorption zone comprises an activated alumina adsorbent.

29. A process according to claim 28 wherein said activated alumina has been previously treated with one or more alkali metal compounds, one or more alkaline earth metal compounds, or a mixture thereof.

30. A process according to claim 28 wherein said activated alumina adsorbent has been previously treated with caustic.

31. A process according to claim 18 wherein said adsorbent comprises silica adsorbents.

32. A process according to claim 18 wherein said adsorption zone comprises zinc oxides adsorbents.

33. A process according to claim 23 wherein said regenerating of said adsorbent occurs after said adsorption capacity has been reached.

34. A process according to claim 29 wherein said regenerating of said adsorbent occurs after said adsorption capacity has been reached.

35. A process to remove CS₂ from a dimethylsulfide stream, said process comprising adsorbing said CS₂ in an adsorption zone to remove a portion of said CS₂ from said dimethylsulfide to produce a low CS₂ dimethylsulfide product wherein said adsorption zone comprises an adsorber containing activated alumina adsorbent;

wherein said activated alumina has been previously treated with one or more alkali metal compounds, one or more alkaline earth metal compounds, or a mixture thereof.

36. A process to remove CS₂ from a dimethylsulfide stream, said process comprising adsorbing said CS₂ in an adsorption zone to remove a portion of said CS₂ from said dimethylsulfide stream to produce a low CS₂ dimethylsulfide product wherein said adsorption zone comprises an adsorber containing activated alumina adsorbent;

wherein said activated alumina has been previously treated with one or more alkali metal compounds, one or more alkaline earth metal compounds, or a mixture thereof;

wherein said adsorber is operated at a temperature in a range of −

25°

C. and 100°

C.;

wherein said adsorber is operated to its adsorption capacity and regenerated with nitrogen or natural gas at a temperature in a range of 235°

C. to 300°

C.