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US3758612A
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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 19:52
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)
US1841055A
Cited
US2347955A
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US2986585A
Cited
US3325245A
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US3290403A
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US3391214A
Cited
US3510537A
Cited
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 |