Patent US2045291A successfully refreshed from Google Patents.
Patent US4507518A successfully refreshed from Google Patents.
US4507518A
Expired / Lapsed
US
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Dehydration of 2,5-dimethyl-2,5-hexanediol
Assignee: BIO-UCLAF SA A CORP OF DELAWARE
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Filing: 1983-12-14
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Granted: 1985-03-26
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Expires: 2003-12-14
Abstract
Abstract This invention relates to an improved process for the dehydration of 2,5-dimethyl-2,5-hexanediol to give good yields of 2,5-dimethyl-2,4-hexadiene with a minimum of by-products. This is accomplished by heating 2,5-dimethyl-2,5-hexanediol with a montmorillonite clay catalyst, preferably in the presence of a lower aliphatic alcohol.
Inventors
- 👤 David V. Petrocine
- 👤 Ronald Harmetz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:58
CPC Classifications
C; C07; C07C; C07C1/00; C07C1/20; C07C1/24; C07C2521/00; C07C2521/16
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
30 words
A process for the conversion of 2,5-dimethyl-2,5-hexanediol into 2,5-dimethyl-2,4-hexadiene which comprises contacting 2,5-dimethyl-2,5-hexanediol with a montmorillonite clay catalyst at a temperature of from about 200° C. to about 300° C.
Claim 2
Dependent Claim
30 words
A process for the conversion of 2,5-dimethyl-2,5-hexanediol into 2,5-dimethyl-2,4-hexadiene which comprises contacting 2,5-dimethyl-2,5-hexanediol with a montmorillonite clay catalyst at a temperature of from about 200° C. to about 300° C.
Claim 3
Dependent Claim
19 words
The process of claim 1 wherein the process is carried out in the presence of a lower aliphatic alcohol.
Claim 4
Dependent Claim
12 words
The process of claim 2 wherein the lower aliphatic alcohol is methanol.
Claim 5
Dependent Claim
23 words
The process of claim 1 wherein the process is carried out at a temperature of from about 240° C. to about 275° C.
Claim 6
Dependent Claim
23 words
The process of claim 2 wherein the process is carried out at a temperature of from about 240° C. to about 275° C.
Claim 7
Dependent Claim
23 words
The process of claim 3 wherein the process is carried out at a temperature of from about 240° C. to about 275° C.
Claim 8
Dependent Claim
15 words
The process of claim 1 wherein the process is carried out in a continuous manner.
Claim 9
Dependent Claim
15 words
The process of claim 7 wherein the catalyst is in the form of spherical particles.
Claim 10
Dependent Claim
39 words
A continuous process for the conversion of 2,5-dimethyl-2,5-hexanediol into 2,5-dimethyl-2,4-hexadiene which comprises passing a mixture of 2,5-dimethyl-2,5-hexanediol and a lower aliphatic alcohol over a montmorillonite clay catalyst at a temperature of from about 200° C. to about 300° C.
Claim 11
Dependent Claim
39 words
A continuous process for the conversion of 2,5-dimethyl-2,5-hexanediol into 2,5-dimethyl-2,4-hexadiene which comprises passing a mixture of 2,5-dimethyl-2,5-hexanediol and a lower aliphatic alcohol over a montmorillonite clay catalyst at a temperature of from about 200° C. to about 300° C.
Claim 12
Dependent Claim
23 words
The process of claim 9 wherein the process is carried out at a temperature of from about 240° C. to about 275° C.
Claim 13
Dependent Claim
12 words
The process of claim 9 wherein the lower aliphatic alcohol is methanol.
Claim 14
Dependent Claim
12 words
The process of claim 10 wherein the lower aliphatic alcohol is methanol.
Claim 15
Dependent Claim
15 words
The process of claim 9 wherein the catalyst is in the form of spherical particles.
Claim 16
Dependent Claim
15 words
The process of claim 10 wherein the catalyst is in the form of spherical particles.
Claim 17
Dependent Claim
15 words
The process of claim 12 wherein the catalyst is in the form of spherical particles.
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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) | 1988-03-25 | 1988-09-24 | 1989-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-25 | 1992-09-24 | 1993-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-25 | 1996-09-24 | 1997-03-26 | $7700.00 | Window Closed / Lapsed |