CA1334947C - Enzymatic coal desulfurization - Google Patents
Enzymatic coal desulfurizationInfo
- Publication number
- CA1334947C CA1334947C CA 609352 CA609352A CA1334947C CA 1334947 C CA1334947 C CA 1334947C CA 609352 CA609352 CA 609352 CA 609352 A CA609352 A CA 609352A CA 1334947 C CA1334947 C CA 1334947C
- Authority
- CA
- Canada
- Prior art keywords
- sulfatase
- fossil fuel
- contacting
- oxidizing agent
- parts
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
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- Enzymes And Modification Thereof (AREA)
Abstract
The invention relates to a method wherein coal is desulfurized by treatment with a hydrolase to convert organic sulfur moieties in the coal matrix to sulfates, and by treatment with a sulfatase to cleave the sulfates. In particular the invention provides a method for reducing the total sulfur content of a fossil fuel containing organic sulfur comprising the steps of: contacting the fossil fuel with a solution containing sulfatase to release organic sulfur as water-soluble free sulfate; recovering from the solution a fossil fuel having a reduced sulfur content.
Claims (36)
1. A method for reducing total sulfur content of a fossil fuel containing organic sulfur, comprising the steps of:
contacting the fossil fuel with a sulfatase to release sulfur; and recovering a fossil fuel having a reduced sulfur content.
contacting the fossil fuel with a sulfatase to release sulfur; and recovering a fossil fuel having a reduced sulfur content.
2. The method of claim 1, wherein the fossil fuel is coal, petroleum, or a process-derived product thereof.
3. The method of claim 1, wherein the organic sulfur is a thiophene, sulfide, thiol or a combination thereof.
4. The method of claim 1, further comprising the step of:
contacting said fossil fuel with an oxidizing agent.
contacting said fossil fuel with an oxidizing agent.
5. The method of claim 4, wherein said oxidizing agent is an alkali.
6. The method of claim 4, wherein said oxidizing agent is an acid.
7. The method of claim 4, wherein said oxidizing agent is an oxidation enzyme.
8. The method of claim 4, wherein the contact with said oxidizing agent and said sulfatase enzyme is consecutive.
9. The method of claim 4, wherein the contact with said oxidizing agent and said sulfatase enzyme is concurrent.
10. The method of claim 7, wherein said oxidation enzyme and said sulfatase are immobilized on packing during said step of contacting with said oxidation enzyme and said sulfatase.
11. The method of claim 7, wherein said oxidation enzyme is peroxidase or laccase.
12. The method of claim 7, wherein said oxidation enzyme is horseradish peroxidase.
13. The method of claim 12, wherein said contacting with said peroxidase is in the presence of excess oxygen, at a temperature from 0° to 80°C and a pH of from 5 to 9, and with an amount of the peroxidase ranging from 0.01 to 10 parts by weight per 100 parts by weight of the fossil fuel.
14. The method of claim 1, wherein said sulfatase is selected from the group consisting of Aerobacter species sulfatase, limpet sulfatase, abalone entrail sulfatase, and Helix species sulfatase.
15. The method of claim 14, wherein said sulfatase is Aerobacter aerogenes arylsulfatase.
16. The method of claim 15, wherein said contacting with said sulfatase is in the presence of excess water at a temperature from 0° to 80°C and a pH of from 5 to 9, and with an amount of the arylsulfatase ranging from 0.01 to 10 parts by weight per 100 parts by weight of fossil fuel.
17. The method of claim 16, wherein said contacting with said sulfatase is in the presence of from 0.1 to one parts by weight of water per 100 parts of weight of the fossil fuel.
18. The method of claim 1, further comprising the step of:
recovering from the solution a soluble sulfate by filtration, centrifugation or ion exchange adsorption.
recovering from the solution a soluble sulfate by filtration, centrifugation or ion exchange adsorption.
19. A method for reducing total sulfur content of a fossil fuel containing organic sulfur, comprising the steps of:
contacting the fossil fuel with a solution containing sulfatase to release organic sulfur as water-soluble free sulfate; and recovering from the solution a fossil fuel having a reduced sulfur content.
contacting the fossil fuel with a solution containing sulfatase to release organic sulfur as water-soluble free sulfate; and recovering from the solution a fossil fuel having a reduced sulfur content.
20. The method of claim 19, wherein the fossil fuel is coal, petroleum, or a process-derived product thereof.
21. The method of claim 19, wherein the organic sulfur is a thiophene, sulfide, thiol or a combination thereof.
22. The method of claim 19, further comprising the step of:
contacting said fossil fuel with an oxidizing agent.
contacting said fossil fuel with an oxidizing agent.
23. The method of claim 22, wherein said oxidizing agent is an alkali.
24. The method of claim 22, wherein said oxidizing agent is an acid.
25. The method of claim 22, wherein said oxidizing agent is an oxidation enzyme.
26. The method of claim 22, wherein the contact with said oxidizing agent and said sulfatase enzyme is consecutive.
27. The method of claim 22, wherein the contact with said oxidizing agent and said sulfatase enzyme is concurrent.
28. The method of claim 25, wherein said oxidation enzyme and said sulfatase are immobilized on packing during said step of contacting with said oxidation enzyme and said sulfatase.
29. The method of claim 25, wherein said oxidation enzyme is peroxidase or laccase.
30. The method of claim 25, wherein said oxidation enzyme is horseradish peroxidase.
31. The method of claim 30, wherein said contacting with said peroxidase is in the presence of excess oxygen, at a temperature from 0° to 80°C and a pH of from 5 to 9, and with an amount of the peroxidase ranging from 0.01 to 10 parts by weight per 100 parts by weight of the fossil fuel.
32. The method of claim 19, wherein said sulfatase is selected from the group consisting of Aerobacter species sulfatase, limpet sulfatase, abalone entrail sulfatase, and Helix species sulfatase.
33. The method of claim 32, wherein said sulfatase is Aerobacter aerogenes arylsulfatase.
34. The method of claim 33, wherein said contacting with said sulfatase is in the presence of excess water at a temperature from 0° to 80°C and a pH of from 5 to 9, and with an amount of the arylsulfatase ranging from 0.01 to 10 parts by weight per 100 parts by weight of fossil fuel.
35. The method of claim 34, wherein said contacting with said sulfatase is in the presence of from 0.1 to one parts by weight of water per 100 parts by weight of the fossil fuel.
36. The method of claim 19, further comprising the step of:
recovering from the solution a soluble sulfate by filtration, centrifugation or ion exchange adsorption.
recovering from the solution a soluble sulfate by filtration, centrifugation or ion exchange adsorption.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US17555788A | 1988-03-31 | 1988-03-31 | |
| US175,557 | 1988-03-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1334947C true CA1334947C (en) | 1995-03-28 |
Family
ID=22640709
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 609352 Expired - Fee Related CA1334947C (en) | 1988-03-31 | 1989-08-24 | Enzymatic coal desulfurization |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1334947C (en) |
-
1989
- 1989-08-24 CA CA 609352 patent/CA1334947C/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |