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US4568767A
Expired / Lapsed
US
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Process for the manufacture of dialkyl sulfides
Assignee: Arkema Inc
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Filing: 1981-12-23
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Granted: 1986-02-04
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Expires: 2001-12-23
Abstract
Abstract A process is provided for the preparation of dialkyl sulfides by reacting alkenes and hydrogen sulfide at elevated temperature in the presence of a Type X, Y or L zeolite containing from about 5 to 15 percent by weight of alkali metal, expresed as Me 2 O (where Me is an alkali metal).
Inventors
- 👤 Edward J. Dzierza
- 👤 Bernard Buchholz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:41
CPC Classifications
C; C07; C07C; C07C321/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
70 words
A continuous, vapor-phase reaction for preparing C 4 -C 24 dialkyl sulfides which comprises contacting a feed of C 2 -C 12 alkene and hydrogen sulfide at a temperature in the range of about 235° to about 400° C. with a Type X, Y or L zeolite containing from about 5 up to 15 percent by weight alkali metal, expressed as Me 2 O, where Me is an alkali metal.
Claim 2
Dependent Claim
70 words
A continuous, vapor-phase reaction for preparing C 4 -C 24 dialkyl sulfides which comprises contacting a feed of C 2 -C 12 alkene and hydrogen sulfide at a temperature in the range of about 235° to about 400° C. with a Type X, Y or L zeolite containing from about 5 up to 15 percent by weight alkali metal, expressed as Me 2 O, where Me is an alkali metal.
Claim 3
Dependent Claim
37 words
The process of claim 1 wherein the crude reaction product of said process comprises a mixture of alkyl mercaptan and the corresponding dialkyl sulfide, and said alkyl mercaptan is separated and recycled as part of said feed.
Claim 4
Dependent Claim
19 words
The process of claim 2 wherein the pressure of said reaction ranges from about atmospheric to about 600 psig.
Claim 5
Dependent Claim
25 words
The process of claim 2 wherein the molar ratio of hydrogen sulfide to alkene exclusive of recycled product is from about 5:1 to about 1:5.
Claim 6
Dependent Claim
32 words
The process of claim 2 wherein the rate at which the alkene contacts said zeolite ranges from about 20 to about 300 gram-moles of alkene per kilogram of zeolite per 24 hours.
Claim 7
Dependent Claim
28 words
The process of claim 2 wherein an inert gas is a part of said feed and is continuously recycled in the process to remove exothermic heat of reaction.
Claim 8
Dependent Claim
23 words
The process of claim 2 wherein the zeolite is Type Y containing from about 10 up to 15 percent by weight alkali metal.
Claim 9
Dependent Claim
13 words
The process of claim 7 wherein the alkali metal is sodium or potassium.
Claim 10
Dependent Claim
10 words
The process of claim 8 wherein the alkene is ethylene.
Claim 11
Dependent Claim
35 words
The process of claim 9 wherein the elevated temperature is in the range of from about 235° to about 350° C. and the pressure of said reaction ranges from about 50 to about 450 psig.
Claim 12
Dependent Claim
32 words
The process of claim 10 wherein the alkene contacts said zeolite at a rate in the range of from about 50 to about 200 gram-moles per kilogram of zeolite per 24 hours.
Claim 13
Dependent Claim
55 words
The process of claim 11 wherein the alkene and hydrogen sulfide are continuously fed to the reaction at a molar ratio, exclusive of recycled product, of about 2:1, and said crude reaction product, after separation of alkyl mercaptan, is continuously distilled to provide a dialkyl sulfide having a purity of at least about 95 percent.
Claim 14
Dependent Claim
30 words
The process of claim 11 or 12 wherein an inert gas is a part of said feed and is continuously recycled in the process to remove exothermic heat of reaction.
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) | 1989-02-03 | 1989-08-05 | 1990-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-03 | 1993-08-05 | 1994-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-03 | 1997-08-05 | 1998-02-04 | $7700.00 | Window Closed / Lapsed |