US4102931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of tertiary mercaptans using zeolite catalysts
Assignee: Arkema Inc
•
Filing: 1977-05-17
•
Granted: 1978-07-25
•
Expires: 1997-05-17
Abstract
Abstract Certain synthetic zeolites have been found to provide high conversion over extended periods when used as catalysts in the addition reaction of hydrogen sulfide with branched, unsymmetrical olefins to produce tertiary mercaptans.
Inventors
- 👤 Bernard Buchholz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:31
CPC Classifications
C; C07; C07C; C07C319/00; C07C319/02; C07C319/04
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
102 words
A method for preparing tertiary mercaptans having from 4 to 18 carbon atoms comprising reacting hydrogen sulfide with a branched, unsymmetrical olefin or oligomer thereof, said olefin having the formula R 1 R 2 C=CR 3 R 4 where R 1 and R 2 are the same or different alkyl radicals, and R 3 and R 4 are independently either hydrogen or the same or different alkyl radicals, in the presence of a catalytic amount of a synthetic zeolite of the X or Y type having an alkali metal content, expressed as Na 2 O, of less than 10 percent by weight.
Claim 2
Independent Claim
102 words
A method for preparing tertiary mercaptans having from 4 to 18 carbon atoms comprising reacting hydrogen sulfide with a branched, unsymmetrical olefin or oligomer thereof, said olefin having the formula R 1 R 2 C=CR 3 R 4 where R 1 and R 2 are the same or different alkyl radicals, and R 3 and R 4 are independently either hydrogen or the same or different alkyl radicals, in the presence of a catalytic amount of a synthetic zeolite of the X or Y type having an alkali metal content, expressed as Na 2 O, of less than 10 percent by weight.
Claim 3
Dependent Claim
41 words
The method of claim 1 wherein a molar excess of hydrogen sulfide and the olefin are continuously passed over said zeolite at a rate of from about 20 to about 250 gram-moles of olefin per day for each kilogram of zeolite.
Claim 4
Dependent Claim
24 words
The method of claim 2 wherein the reaction is carried out at superatmospheric pressure and temperatures ranging from about 20° to about 200° C.
Claim 5
Dependent Claim
25 words
The method of claim 3 wherein the reaction pressure ranges from about 20 to 1000 psig and the temperatures range from 50° - 150° C.
Claim 6
Dependent Claim
29 words
The method of claim 3 wherein the alkali metal content has been reduced to below 10 percent by exchanging the alkali metal ions with protons or catalytically active cations.
Claim 7
Dependent Claim
42 words
The method of claim 3 wherein the alkali metal content has been reduced to below 10 percent by exchanging the alkali metal ions with ammonium ions and thereafter the zeolite is calcined to remove at least a major proportion of the ammonia.
Claim 8
Dependent Claim
14 words
The process of claim 3 wherein the alkali metal content is below 5 percent.
Claim 9
Dependent Claim
13 words
The process of claim 6 wherein the catalyst is a Y type zeolite.
Claim 10
Dependent Claim
40 words
The process of claim 8 wherein the alkali metal content has been reduced to below 5 percent by exchanging sodium ions with ammonium ions, and thereafter the zeolite is calcined to remove at least a major proportion of the ammonia.
Claim 11
Dependent Claim
14 words
The process of claim 8 wherein the alkali metal content is below 2.5 percent.
Claim 12
Dependent Claim
10 words
The process of claim 9 wherein the olefin is isobutylene.
Claim 13
Dependent Claim
10 words
The process of claim 9 wherein the olefin is diisobutylene.
Claim 14
Dependent Claim
11 words
The process of claim 9 wherein the olefin is propylene trimer.
Claim 15
Dependent Claim
11 words
The process of claim 9 wherein the olefin is propylene tetramer.
References Cited (Backward Citations)
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Cited
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Cited
US3534106A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-24 | 1982-01-23 | 1982-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-24 | 1986-01-23 | 1986-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-24 | 1990-01-23 | 1990-07-25 | $7700.00 | Window Closed / Lapsed |