US3855279A
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: 1974-12-17
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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*C. to about 600*C. The catalyst is the calcined residue of the mixed phosphates of iron and lead.
Inventors
- 👤 W Watkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:57
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/835; B01J27/00; B01J27/14; B01J27/16; B01J27/18; B01J27/1802; C; C07; C07C; C07C51/00; C07C51/347; C07C51/377
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
17 words
A PROCESS FOR MAKING UNSATURATED ACIDS AND ESTERS BY DEHYDROGENATION OF A COMPOUND DEFINED BY THE FORMULA
Claim 2
Dependent Claim
17 words
A PROCESS FOR MAKING UNSATURATED ACIDS AND ESTERS BY DEHYDROGENATION OF A COMPOUND DEFINED BY THE FORMULA
Claim 3
Dependent Claim
18 words
A process according to claim 1 wherein x has a valve of from about 0.5 to about 1.5.
Claim 4
Dependent Claim
12 words
precipitating from said solution a mixture of ferric phosphate and lead phosphate,
Claim 5
Dependent Claim
12 words
precipitating from said solution a mixture of ferric phosphate and lead phosphate,
Claim 6
Dependent Claim
3 words
washing said precipitate,
Claim 7
Dependent Claim
3 words
washing said precipitate,
Claim 8
Dependent Claim
21 words
A process according to claim 1 wherein the process is conducted at a temperature of from about 350*C. to about 500*C.
Claim 9
Dependent Claim
21 words
A process according to claim 3 wherein the process is conducted at a temperature of from about 400*C. to about 450*C.
Claim 10
Dependent Claim
3 words
drying said precipitate,
Claim 11
Dependent Claim
3 words
drying said precipitate,
Claim 12
Dependent Claim
16 words
adjusting the size and shape of the catalyst particles to that desired for process use, and
Claim 13
Dependent Claim
16 words
adjusting the size and shape of the catalyst particles to that desired for process use, and
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
14 words
calcining said adjusted particles at a temperature of from about 400*C. to about 600*C.
Claim 16
Dependent Claim
14 words
calcining said adjusted particles at a temperature of from about 400*C. to about 600*C.
Claim 17
Dependent Claim
25 words
A process according to claiam 5 wherein the solution of salts of iron and lead has a pH of from about 0.5 to about 4.0.
Claim 18
Dependent Claim
25 words
A process according to claiam 5 wherein the solution of salts of iron and lead has a pH of from about 0.5 to about 4.0.
Claim 19
Dependent Claim
26 words
A process according to claim 6 wherein the said solution of salts of iron and lead has a pH of from about 2 to about 2.5.
Claim 20
Dependent Claim
30 words
A process according to claim 5 wherein the pH of the solution following precipitation of ferric phosphate and lead phosphate has a pH of from about 5 to about 7.
Claim 21
Dependent Claim
23 words
A process according to claim 5 wherein the precipitation of the ferric phosphate and the lead phosphate is accomplished with dibasic ammonium phosphate.
Claim 22
Dependent Claim
13 words
A process according to claim 1 wherein water is present during the reaction.
Claim 23
Dependent Claim
30 words
A process according to claim 10 wherein the water is present to the extent of from about 0.5 moles to about 20 moles per mole of feed acid or ester.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |