US4070397A
Expired / Lapsed
US
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Process for the preparation of methacrylic acid from the corresponding aldehyde
Assignee: Standard Oil Co
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Filing: 1975-03-27
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Granted: 1978-01-24
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Expires: 1995-03-27
Abstract
Abstract Catalysts containing tungsten, phosphorus, vanadium and molybdenum have been found to be especially effective for the oxidation of unsaturated aldehydes to form the corresponding unsaturated acid. These catalysts may optionally contain one or more of tin, antimony, arsenic, copper, cerium, boron, chromium, iron, nickel, cobalt, uranium, manganese, strontium, silver, rubidium, rhodium, cadmium, bismuth, indium, zinc and lanthanum.
Inventors
- 👤 James F. White
- 👤 James R. Rege
- 👤 Robert K. Grasselli
- 👤 Dev. D. Suresh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:42
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J23/88; B01J23/887; B01J23/8878; B01J23/002; B01J23/16; B01J23/24; B01J23/28; B01J23/30; B01J23/31; B01J23/8877; B01J23/888; B01J23/8885; B01J27/00; B01J27/14; B01J27/186; B01J27/195; B01J27/198; B01J27/199; C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/25; C07C51/252; B01J2523/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
106 words
In the process for the production of methacrylic acid comprising reacting methacrolein with molecular oxygen in the vapor phase at a temperature of 200° to 600° C. in the presence of a catalyst and optionally in the presence of steam, the improvement comprising using a catalyst consisting essentially of Sb, W, P, V, Mo and oxygen, said catalyst having the formula Sb.sub.z W.sub.a P.sub.b V.sub.c Mo.sub.12 O.sub.x wherein z is 0.1-6; a and c are about 0.1 to about 12; b is a positive number less than about 6; and x is the number of oxygens required by the valence states of the other elements present.
Claim 2
Dependent Claim
106 words
In the process for the production of methacrylic acid comprising reacting methacrolein with molecular oxygen in the vapor phase at a temperature of 200° to 600° C. in the presence of a catalyst and optionally in the presence of steam, the improvement comprising using a catalyst consisting essentially of Sb, W, P, V, Mo and oxygen, said catalyst having the formula Sb.sub.z W.sub.a P.sub.b V.sub.c Mo.sub.12 O.sub.x wherein z is 0.1-6; a and c are about 0.1 to about 12; b is a positive number less than about 6; and x is the number of oxygens required by the valence states of the other elements present.
Claim 3
Dependent Claim
13 words
The process of claim 1 wherein b is about 0.5 to about 3.
References Cited (Backward Citations)
JPS4744U
Cited
US3875220A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-23 | 1981-07-25 | 1982-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-23 | 1985-07-25 | 1986-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-23 | 1989-07-25 | 1990-01-24 | $7700.00 | Window Closed / Lapsed |