US4020149A
Expired / Lapsed
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Process for the production of sulfur
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1976-03-01
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Granted: 1977-04-26
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Expires: 1996-03-01
Abstract
Abstract Elemental sulfur is produced by reacting hydrogen sulfide and sulfur dioxide in a solvent reaction medium composed of liquid organic disulfides. The sulfur is separated from the disulfide solvent which may then be reused as the reaction medium.
Inventors
- 👤 David S. Bosniack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:02
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/14; B01D53/1493; B01D53/34; B01D53/46; B01D53/60
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
101 words
A process for producing elemental sulfur comprising: a. reacting hydrogen sulfide with sulfur dioxide in the presence of a liquid organic solvent in a reaction zone, said solvent comprising at least one compound of the formula R 1 -- S -- S -- R 2 wherein R 1 and R 2 are selected from the group consisting of straight and branched chain aliphatic radicals having from 1 to about 15 carbon atoms, cycloaliphatic radicals having from 3 to about 20 carbon atoms, and aryl radicals having from 6 to about 42 carbon atoms; and b. separating elemental sulfur from said solvent.
Claim 2
Dependent Claim
101 words
A process for producing elemental sulfur comprising: a. reacting hydrogen sulfide with sulfur dioxide in the presence of a liquid organic solvent in a reaction zone, said solvent comprising at least one compound of the formula R 1 -- S -- S -- R 2 wherein R 1 and R 2 are selected from the group consisting of straight and branched chain aliphatic radicals having from 1 to about 15 carbon atoms, cycloaliphatic radicals having from 3 to about 20 carbon atoms, and aryl radicals having from 6 to about 42 carbon atoms; and b. separating elemental sulfur from said solvent.
Claim 3
Dependent Claim
28 words
A process as defined in claim 1 wherein R 1 and R 2 are straight and branched chain alkyl radicals having from 1 to about 15 carbon atoms.
Claim 4
Dependent Claim
24 words
A process as defined in claim 1 wherein R 1 and R 2 are cycloalkyl radicals having from 3 to about 20 carbon atoms.
Claim 5
Dependent Claim
19 words
A process as defined in claim 1 wherein said solvent comprises a mixture of diaryl and alkyl aryl disulfides.
Claim 6
Dependent Claim
16 words
A process as defined in claim 1 wherein said solvent comprises a mixture of diaryl disulfides.
Claim 7
Dependent Claim
22 words
A process as defined in claim 5 wherein said diaryl disulfides contain from about 12 to about 30 carbon atoms per molecule.
Claim 8
Dependent Claim
13 words
A process as defined in claim 1 wherein said solvent comprises ditolyl disulfide.
Claim 9
Dependent Claim
59 words
A process for producing elemental sulfur comprising: a. reacting hydrogen sulfide with sulfur dioxide in the presence of a liquid organic solvent in a reaction zone, said solvent comprising a mixture of organic disulfides obtained by air blowing an alkaline solution produced by the treatment of mercaptan-containing hydrocarbons with a base; and b. separating elemental sulfur from said solvent.
Claim 10
Dependent Claim
59 words
A process for producing elemental sulfur comprising: a. reacting hydrogen sulfide with sulfur dioxide in the presence of a liquid organic solvent in a reaction zone, said solvent comprising a mixture of organic disulfides obtained by air blowing an alkaline solution produced by the treatment of mercaptan-containing hydrocarbons with a base; and b. separating elemental sulfur from said solvent.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-25 | 1980-10-25 | 1981-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-25 | 1984-10-25 | 1985-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-25 | 1988-10-25 | 1989-04-26 | $7700.00 | Window Closed / Lapsed |