US4005149A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mercaptans by hydrogen sulfide-cleavage of organic sulfides in presence of carbon disulfide
Assignee: Phillips Petroleum Co
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Filing: 1975-05-01
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Granted: 1977-01-25
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Expires: 1995-05-01
Abstract
Abstract In a process for preparing mercaptans by catalytic cleavage of organic sulfides with hydrogen sulfide in the presence of sulfactive catalysts a method is provided for increasing the total conversion of reactants to mercaptans by including carbon disulfide in the reaction mixture. In a preferred embodiment carbon disulfide is present in the reaction mixture of hydrogen sulfide and organic sulfides in an amount in the molar ratio of about 0.1/1 to about 50/1 organic sulfide to carbon disulfide.
Inventors
- 👤 Donald H. Kubicek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:12
CPC Classifications
C; C07; C07C; C07C319/00; C07C319/02; C07C319/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
67 words
In the preparation of mercaptans by catalytic cleavage of organic sulfides with hydrogen sulfide in the presence of a sulfactive catalyst a method for increasing the total conversion of reactants to mercaptans comprises conducting the reaction in the presence of carbon disulfide in a mole ratio of at most about 50/1 of organic sulfide/carbon disulfide and at a temperature and pressure sufficient for carrying out the reaction.
Claim 2
Dependent Claim
67 words
In the preparation of mercaptans by catalytic cleavage of organic sulfides with hydrogen sulfide in the presence of a sulfactive catalyst a method for increasing the total conversion of reactants to mercaptans comprises conducting the reaction in the presence of carbon disulfide in a mole ratio of at most about 50/1 of organic sulfide/carbon disulfide and at a temperature and pressure sufficient for carrying out the reaction.
Claim 3
Dependent Claim
32 words
The method of claim 1 wherein the carbon disulfide is added to the reaction mixture in a mole ratio in the range of about 0.1/1 to about 50/1 of organic sulfide/carbon disulfide.
Claim 4
Dependent Claim
80 words
The method of claim 2 wherein the organic sulfides are represented by the formula R--S--R; wherein the R groups are independently selected from the group consisting of alkyl, cycloalkyl and aryl radicals and combination radicals such as alkylcycloalkyl, aralkyl, alkaryl and the like; wherein the R groups are selected such that the useful sulfides generally contain from 2 to about 40 or more carbon atoms per molecule with a preferable range of carbon atoms being from 2 to about 16.
Claim 5
Dependent Claim
31 words
The method of claim 3 wherein the reaction is carried out at temperatures ranging from about 177° to about 371° C and pressures are from about 100 to about 5000 psig.
Claim 6
Dependent Claim
23 words
The method of claim 4 wherein the organic sulfide is chosen from among the group comprising dimethyl sulfide, di-n-butyl sulfide and di-n-octyl sulfide.
References Cited (Backward Citations)
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US2829171A
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US3081353A
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US3069472A
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US3488739A
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US3880933A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-25 | 1980-07-26 | 1981-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-25 | 1984-07-26 | 1985-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-25 | 1988-07-26 | 1989-01-25 | $7700.00 | Window Closed / Lapsed |