US3875220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of methacrylic acid from methacrolein
Assignee: Standard Oil Co
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Filing: 1973-10-11
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Granted: 1975-04-01
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Expires: 1993-10-11
Abstract
Abstract Catalysts containing phosphorus, vanadium and molybdenum have been found to be especially effective for the oxidation of methacrolein with molecular oxygen to obtain methacrylic acid. The catalysts may be optionally promoted with Bi, As, B, Ce, Cr, Ag, Fe, W, Pb, Mn, Tl, Te, Ni, Nb, B, Sn and/or Cu.
Inventors
- 👤 James F White
- 👤 James R Rege
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:48
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: 8
Claim 1
Independent Claim
58 words
IN THE PROCESS FOR THE PREPARATION OF METHACRYLIC ACID FROM METHACROLEIN BY REACTING METHACROLEIN WITH MOLECULAR OXYGEN AT A TEMPERATURE OF ABOUT 200* TO ABOUT 500*C. IN THE PRESENCE OF A CATALYST AND OPTIONALLY IN THE PRESENCE OF STEAM, THE IMPROVEMENT COMPRISING USING A CATALYST CONSISTING ESSENTIALY OF PHOSPHOROUS, VANADIUM MOLYBDENUM AND OXYGEN, SAID CATALYST HAVING THE FORMULA
Claim 2
Dependent Claim
58 words
IN THE PROCESS FOR THE PREPARATION OF METHACRYLIC ACID FROM METHACROLEIN BY REACTING METHACROLEIN WITH MOLECULAR OXYGEN AT A TEMPERATURE OF ABOUT 200* TO ABOUT 500*C. IN THE PRESENCE OF A CATALYST AND OPTIONALLY IN THE PRESENCE OF STEAM, THE IMPROVEMENT COMPRISING USING A CATALYST CONSISTING ESSENTIALY OF PHOSPHOROUS, VANADIUM MOLYBDENUM AND OXYGEN, SAID CATALYST HAVING THE FORMULA
Claim 3
Dependent Claim
29 words
The process of claim 1 wherein the molybdenum in the catalyst is hexavalent molybdenum which has been reduced to lose about 2 to about 20% of its positive valance.
Claim 4
Dependent Claim
20 words
The process of claim 1 wherein the catalyst is prepared by refluxing an aqueous mixture containing at least molybdenum trioxide.
Claim 5
Dependent Claim
13 words
The process of claim 1 wherein a is about 0.5 to about 3.
Claim 6
Dependent Claim
13 words
The process of claim 1 wherein b is about 1 to about 6.
Claim 7
Dependent Claim
22 words
The process of claim 1 wherein the catalyst contains one or more of bismuth, arsenic, cerium, chromium, tin, tungsten, nickel or niobium.
Claim 8
Dependent Claim
11 words
The process of claim 1 conducted in the presence of steam.
References Cited (Backward Citations)
US3435069A
Cited
US3230248A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |