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US4876389A
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Process for the production of organic polysulphides and catalyst system for its use
Assignee: Societe Nationale Elf Aquitaine Production SA
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Filing: 1987-11-27
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Granted: 1989-10-24
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Expires: 2007-11-27
Abstract
Abstract Process for the production of organic polysulphides of the type R--S n --R, where R is a hydrocarbon group and n a number from 2 to 8, by heating one or more mercaptans with sulphur, in the presence of a catalyst; the catalyst consists of the combination of a mercaptan with an alkene oxide and an alkaline base.
Inventors
- 👤 Henri Gongora
- 👤 Yves Darche
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:03
CPC Classifications
C; C07; C07C; C07C321/00; C07C321/12; B; B01; B01J; B01J31/00; B01J31/26; B01J31/02; B01J31/0215; B01J31/0217; B01J31/04; C07C319/00; C07C319/22; C07C319/24
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
77 words
A process for the production of organic polysulphides of the type R--S n --R, where R is a hydrocarbon group and n a number from 2 to 8, by heating one or more mercaptans with sulphur, in the presence of a catalyst, said catalyst being obtained by condensing one molar equivalent of a mercaptan with 1 to 20 molar equivalents of an alkylene oxide in the presence of 0.01 to 1.5 molar equivalent of an alkaline base.
Claim 2
Dependent Claim
77 words
A process for the production of organic polysulphides of the type R--S n --R, where R is a hydrocarbon group and n a number from 2 to 8, by heating one or more mercaptans with sulphur, in the presence of a catalyst, said catalyst being obtained by condensing one molar equivalent of a mercaptan with 1 to 20 molar equivalents of an alkylene oxide in the presence of 0.01 to 1.5 molar equivalent of an alkaline base.
Claim 3
Dependent Claim
58 words
The process according to claim 1, wherein the catalyst corresponds to the formula : R-S(C m H 2m O) x H. (MOH) y wherein R denotes a hydrocarbon group, m is a number from 2 to 4, x a number from 1 to 20, y is a number from 0.01 to 1, and M denotes an alkali metal.
Claim 4
Dependent Claim
18 words
The process according to claim 2, wherein x is 4 to 12, while y is 0.1 to 0.5.
Claim 5
Dependent Claim
15 words
The process according to claim 2, wherein R is a C 1 -C 20 alkyl.
Claim 6
Dependent Claim
21 words
The process according to claim 2, wherein R is C 6 -C 18 alkyl, and the alkylene oxide is ethylene oxide.
Claim 7
Dependent Claim
11 words
The process according to claim 5, wherein the alkyl is branched.
Claim 8
Dependent Claim
13 words
The process according to claim 6, wherein the alkyl is a tertiry alkyl.
Claim 9
Dependent Claim
11 words
The process according to claim 6, wherein the alkyl is tert-nonyl.
Claim 10
Dependent Claim
11 words
The process according to claim 6, wherein the alkyl is tert-dodecyl.
Claim 11
Dependent Claim
19 words
The process according to claim 1, wherein the heating takes place at a temperature from 60° to 150° C.
Claim 12
Dependent Claim
20 words
The process according to claim 1, wherein the heating takes place at a temperature of between 70° and 140° C.
Claim 13
Dependent Claim
34 words
The process according to claim 10, wherein n has a value of 3 to 5, said heating operation being carried out at a temperature which is proportionately higher the lower the desired number n.
Claim 14
Dependent Claim
33 words
The process according to claim 1, wherein the heating of the mercaptan with sulphur and the catalyst is carried out in two stages, each being followed by a degassing of H 2 S.
Claim 15
Dependent Claim
22 words
The process according to claim 13, wherein said degassing of H 2 S is carried out by means of an inert gas.
Claim 16
Dependent Claim
17 words
The process according to claim 1, carried out at a relative pressure of 0.2 to 1 bar.
Claim 17
Dependent Claim
67 words
The process according to claim 1, wherein the catalyst is prepared by homogenizing one mole of mercaptan with αy moles (α=1 to 1.5) of alkaline base, preferably between 50° and 100° C., and then saturating the product obtained with alkylene oxide at a temperature of 80° to 120° C. at a relative pressure of 0.2 to 4 bars, followed by a degassing of the excess alkylene oxide.
Claim 18
Dependent Claim
23 words
The process according to claim 16, wherein said degassing of the excess alkylene oxide is carried out by means of an inert gas.
Claim 19
Dependent Claim
42 words
The process according to claim 16, wherein said mercaptan is C 6 -C 18 , said homogenization taking place between approximately 75° and 85° C. for 4 to 6 hours and the saturation with alkylene oxide at approximately 100° to 110° C.
Claim 20
Dependent Claim
13 words
The process according to claim 1, wherein the process is carried out continuously.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1992-10-23 | 1993-04-24 | 1993-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-23 | 1997-04-24 | 1997-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-23 | 2001-04-24 | 2001-10-24 | $7700.00 | Window Closed / Lapsed |