US3917673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic process for the manufacture of unsaturated acids and esters
Assignee: Eastman Kodak Co
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Filing: 1973-10-26
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Granted: 1975-11-04
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Expires: 1993-10-26
Abstract
Abstract Lower aliphatic acids, e.g., isobutyric acid, and esters, e.g., methyl isobutyrate, are dehydrogenated in the presence of oxygen and a solid heterogeneous dehydrogenation catalyst at temperatures in the range of from about 250* to about 600*C. The catalyst is the calcined residue of a mixture of bismuth oxynitrate, iron phosphate, and lead phosphate.
Inventors
- 👤 Windell C Watkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:08
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/347; C07C51/377; B; B01; B01J; B01J27/00; B01J27/14; B01J27/185; B01J27/1853; B01J27/24
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
16 words
A PROCESS FOR MAKING UNSATURATED ACIDS AND ESTERS BY DEHYDROGENATION OF ACOMPOUND DEFINED BY THE FORMULA
Claim 2
Dependent Claim
16 words
A PROCESS FOR MAKING UNSATURATED ACIDS AND ESTERS BY DEHYDROGENATION OF ACOMPOUND DEFINED BY THE FORMULA
Claim 3
Dependent Claim
38 words
A process according to claim 1 wherein the atomic ratio of the bismuth to iron is from about 1.5:1 to about 3:1 and the atomic ratio of the lead to iron is from about 0.1:1 to about 10:
Claim 4
Dependent Claim
12 words
diluting said nitric acid with water so as to precipitate bismuth oxynitrate,
Claim 5
Dependent Claim
12 words
diluting said nitric acid with water so as to precipitate bismuth oxynitrate,
Claim 6
Dependent Claim
17 words
adding dibasic ammonium phosphate to the remaining solution so as to precipitate ferric phosphate and lead phosphate,
Claim 7
Dependent Claim
17 words
adding dibasic ammonium phosphate to the remaining solution so as to precipitate ferric phosphate and lead phosphate,
Claim 8
Dependent Claim
21 words
A process according to claim 1 wherein the process is conducted at a tempErature of from about 350* to about 500*C.
Claim 9
Dependent Claim
21 words
A process according to claim 1 wherein the process is conducted at a temperature of from about 400* to about 450*C.
Claim 10
Dependent Claim
5 words
washing the resultant mixed precipitate,
Claim 11
Dependent Claim
5 words
washing the resultant mixed precipitate,
Claim 12
Dependent Claim
3 words
drying said precipitate,
Claim 13
Dependent Claim
3 words
drying said precipitate,
Claim 14
Dependent Claim
15 words
A process according to claim 1 wherein the catalyst is prepared by the steps of
Claim 15
Dependent Claim
16 words
adjusting the size and shape of the precipitate particles to that desired for process use, and
Claim 16
Dependent Claim
16 words
adjusting the size and shape of the precipitate particles to that desired for process use, and
Claim 17
Dependent Claim
30 words
A process according to claim 5 wherein the initial solution of salts of bismuth, iron and lead in nitric acid has a ph of from about 0 to about 1.7.
Claim 18
Dependent Claim
28 words
A process according to claim 5 wherein the bismuth oxynitrate is precipitated by diluting the nitric acid solution to a pH of from about 2 to about 4.
Claim 19
Dependent Claim
10 words
calcining said adjusted catalyst particles at a temperature above 500*C.
Claim 20
Dependent Claim
10 words
calcining said adjusted catalyst particles at a temperature above 500*C.
Claim 21
Dependent Claim
27 words
A process according to claim 5 wherein the pH of the solution following the addition of the dibasic ammonium phosphate is from about 5 to about 7.
References Cited (Backward Citations)
US356887A
Cited
US3855279A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |