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Dehydration of diols using lithium phosphate catalyst
Assignee: Compagnie Francaise de Raffinage SA
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Filing: 1972-04-20
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Granted: 1973-09-11
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Expires: 1992-04-20
Abstract
Abstract As a new dehydration catalyst for epoxides or diols, lithium phosphate having a ratio of the numbers of Li to P atoms between 2,2 and 3; a process for preparing the catalyst and its uses have also been disclosed.
Inventors
- 👤 J Maurin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:25
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/26; C01B25/30; B; B01; B01J; B01J27/00; B01J27/14; B01J27/16; B01J27/18; B01J27/1802; B01J27/1806; C01B25/301; C07; C07C; C07C1/00; C07C1/20; C07C1/24; C07C2527/00; C07C2527/14; C07C2527/16; C07C2527/167
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
15 words
The method according to claim 1 and wherein the diol is methyl butane diol -2,3.
Claim 2
Dependent Claim
83 words
The method according to claim 1 and wherein the catalyst is prepared by reacting phosphoric acid and lithium hydroxide with each other in a reaction solution, said reaction solution is cooled, further reacting the cooled reaction solution with an additional amount of cooled lithium hydroxide to obtain a lithium phosphate such that the ratio of the number of Li/P atoms of the amounts of lithium hydroxide and phosphoric acid used in the reaction mixture is between 2.2 and 3, and recovering the catalyst.
References Cited (Backward Citations)
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US2986585A
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US3325245A
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US3290403A
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US3391214A
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US3510537A
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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) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |