US3893946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dehydration catalysts, particularly for the dehydration of diols
Assignee: Compagnie Francaise de Raffinage SA
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Filing: 1973-09-11
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Granted: 1975-07-08
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Expires: 1993-09-11
Abstract
Abstract Dehydration catalysts for vicinal diols prepared by forming an intimate mixture of finely divided solid particles of at least one pyrophosphate and at least one acid orthophosphate of at least one metal belonging to the group consisting of lithium, sodium, strontium and barium into a formed mass which is thereafter calcined to transform the acid orthophosphate into pyrophosphate resulting in a catalyst having superior mechanical properties.
Inventors
- 👤 Joseph Edouard Weisang
- 👤 Georges Szabo
- 👤 Jean Maurin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:14
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/14; B01J27/16; B01J27/18; B01J27/1802; B01J27/1806; B01J37/00; B01J37/0009; B01J37/0018; C; C07; C07C; C07C1/00; C07C1/20; C07C1/24; C07C2527/00; C07C2527/14; C07C2527/16; C07C2527/167; Y; Y10; Y10S; Y10S585/00; Y10S585/8995; Y10S585/906
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
62 words
A DEHYDRATION CATALYST FOR VIVINAL DIOLS PREPARED BY A METHOD CONSISTING ESSENTIALLY OF FORMING AN INTIMATE MIXTURE OF FINELY DIVIDED SOLID PARTICLES OF AT LEAST ONE PYROPHOSPHATE AND AT LEAST ONE ACID ORTHOPOSPHATE OF AT LEAST ONE METAL BELONGING TO THE GROUP CONSISTING OF LITHIUM, SODIUM, STRONTIUM. AMD BARIUM INTO A FORMED MASS AND CALCINATING SAID MASS TO TRANSFORM SAID ACID ORTHOPHOSPHATE.
Claim 2
Dependent Claim
62 words
A DEHYDRATION CATALYST FOR VIVINAL DIOLS PREPARED BY A METHOD CONSISTING ESSENTIALLY OF FORMING AN INTIMATE MIXTURE OF FINELY DIVIDED SOLID PARTICLES OF AT LEAST ONE PYROPHOSPHATE AND AT LEAST ONE ACID ORTHOPOSPHATE OF AT LEAST ONE METAL BELONGING TO THE GROUP CONSISTING OF LITHIUM, SODIUM, STRONTIUM. AMD BARIUM INTO A FORMED MASS AND CALCINATING SAID MASS TO TRANSFORM SAID ACID ORTHOPHOSPHATE.
Claim 3
Dependent Claim
24 words
A catalyst according to claim 1 wherein said phosphates are mixed in powdered form, wetted to form a paste, extruded, dried, and finally calcinated.
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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) | 1978-07-07 | 1979-01-06 | 1979-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-07 | 1983-01-06 | 1983-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-07 | 1987-01-06 | 1987-07-08 | $7700.00 | Window Closed / Lapsed |