US5068445A
Expired / Lapsed
US
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Process for the preparation of organic disulphides and polysulphides
Assignee: Societe Nationale Elf Aquitaine Production SA
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Filing: 1989-04-03
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Granted: 1991-11-26
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Expires: 2009-04-03
Abstract
Abstract The invention relates to the preparation of organic disulphides and polysulphides by the action of sulphur on a mercaptan or on a polysulphide which is lower in sulphur, in the presence of a basic catalyst. In the process according to the invention, an anion exchange resin is used as catalyst.
Inventors
- 👤 Emmanuel Arretz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:52
CPC Classifications
C; C07; C07C; C07C319/00; C07C319/22; C07C319/24
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
54 words
A process for the preparation of organic disulphides and polysulphides comprising reacting sulphur with a mercaptan or a polysulphide which is lower in sulphur, in a liquid medium in the presence of a basic catalyst, said catalyst being an anion exchange resin consisting essentially of an organic polymer or copolymer having a basic function.
Claim 2
Dependent Claim
54 words
A process for the preparation of organic disulphides and polysulphides comprising reacting sulphur with a mercaptan or a polysulphide which is lower in sulphur, in a liquid medium in the presence of a basic catalyst, said catalyst being an anion exchange resin consisting essentially of an organic polymer or copolymer having a basic function.
Claim 3
Dependent Claim
25 words
The process according to claim 1, wherein the quantity of resin used is between 0.1% and 50% by weight in relation to the sulphur added.
Claim 4
Dependent Claim
23 words
The process according to claim 2, wherein the quantity of resin used is between 5% and 40% by weight of the sulphur added.
Claim 5
Dependent Claim
29 words
The process according to claim 1, wherein the reaction is carried out at a temperature between -10° C. and the temperature limit of thermal stability of the resin used.
Claim 6
Dependent Claim
13 words
The process according to claim 4, wherein the temperature is below 100° C.
Claim 7
Dependent Claim
24 words
The process according to claim 1, wherein the anion exchange resin is a resin having tertiary amine functional groups or quaternary ammonium functional groups.
Claim 8
Dependent Claim
20 words
The process according to claim 1, wherein the mercaptan is an alkyl mercaptan, cycloalkyl mercaptan, aryl mercaptan or aralkyl mercaptan.
Claim 9
Dependent Claim
19 words
The process according to claim 7, wherein the hydrocarbon radical of the mercaptan carries one or more functional groups.
Claim 10
Dependent Claim
16 words
The process according to claim 1, wherein the molar ratio mercaptan/sulphur is between 0.3 and 6.
Claim 11
Dependent Claim
19 words
The process according to claim 1 for preparing disulphides, wherein the molar ratio mercaptan/sulphur is between 2 and 6.
Claim 12
Dependent Claim
16 words
The process according to claim 10, wherein the molar ratio mercaptan/sulphur is between 3 an 5.
Claim 13
Dependent Claim
24 words
The process according to claim 1 for preparing polysulphides from primary or secondary mercaptans, wherein the molar ratio mercaptan/sulphur is between 0.3 and 1.
Claim 14
Dependent Claim
22 words
The process according to claim 1 for preparing polysulphides from tertiary mercaptans, wherein the molar ratio mercaptan/sulphur is between 0.3 and 3.
Claim 15
Dependent Claim
36 words
The process according to claim 1 for preparing polysulphides RS n R from polysulphides RS n 'R (2≦n'<n), wherein the molar ratio of the polysulphide RS n 'R to sulphur added is between 0.2 and 1.
Claim 16
Dependent Claim
21 words
The process according to claim 1, wherein the catalyst is a resin having tertiary amine or quaternary ammonium hydroxide function groups.
Claim 17
Dependent Claim
32 words
The process according to claim 15, wherein the catalyst is a resin based on polystyrene crosslinked with divinylbenzene, acrylic resins or phenylacrylic resins, acrylic resins crosslinked with divinylbenzene or resins of phenol-formaldehyde.
Claim 18
Dependent Claim
36 words
The process according to claim 1, wherein the catalyst is an epoxy-amine resin obtained by direct reaction of ammonia and epi-chlorohydrin, a polyvinylpyridine obtained by polymerizing 4-vinylpyridine or resins obtained by aminolysis of acrylates with polyamines.
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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) | 1994-11-25 | 1995-05-27 | 1995-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-25 | 1999-05-27 | 1999-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-25 | 2003-05-27 | 2003-11-26 | $7700.00 | Window Closed / Lapsed |