US4487962A
Expired / Lapsed
US
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Preparation of methacrylic acid by gas phase oxidation of methacrolein
Assignee: BASF SE
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Filing: 1982-09-27
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Granted: 1984-12-11
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Expires: 2002-09-27
Abstract
Abstract An oxidation catalyst wherein the catalytically active component has the general formula Mo.sub.12 P.sub.a Rh.sub.b Cu.sub.c V.sub.d Cs.sub.e X.sub.f Y.sub.g Z h O x , where X is Cr and/or Fe, Y is Nb, Z is Na, Li, K and/or Rb, a is 0.1-4, b is 0.001-1, c is 0.05-2, d is 0.05-4, e is 0.1-5, f is 0-2, g is 0-3 and h is 0-2, and x is the number of oxygen atoms required to saturate the valencies of the other constituents, is very suitable for the preparation of methacrylic acid by gas phase oxidation of methacrolein with an oxygen-containing and steam-containing gas mixture.
Inventors
- 👤 Richard Krabetz
- 👤 Franz Merger
- 👤 Matthias Schwarzmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:34
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/002; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J23/88; B01J23/887; B01J23/8877; B01J23/89; B01J23/8933; B01J23/8993; 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: 2
Claim 1
Independent Claim
101 words
A process for the preparation of methacrylic acid by gas phase oxidation of methacrolein with a gas mixture containing oxygen and steam over an oxidation catalyst wherein the catalytically active component has the formula Mo.sub.12 P.sub.a Rh.sub.b Cu.sub.c V.sub.d Cs.sub.e X.sub.f Y.sub.g Z.sub.h O.sub.x where X is Cr and/or Fe; Y is Nb; Z is Na, Li, K and/or Rb; a is 0.1-4; b is 0.001-1; c is 0.05-2; d is 0.05-4; e is 0.1-5; f is 0-2; g is 0-3; h is 0-2; and x is the number of oxygen atoms required to saturate the valencies of the other constituents.
Claim 2
Dependent Claim
101 words
A process for the preparation of methacrylic acid by gas phase oxidation of methacrolein with a gas mixture containing oxygen and steam over an oxidation catalyst wherein the catalytically active component has the formula Mo.sub.12 P.sub.a Rh.sub.b Cu.sub.c V.sub.d Cs.sub.e X.sub.f Y.sub.g Z.sub.h O.sub.x where X is Cr and/or Fe; Y is Nb; Z is Na, Li, K and/or Rb; a is 0.1-4; b is 0.001-1; c is 0.05-2; d is 0.05-4; e is 0.1-5; f is 0-2; g is 0-3; h is 0-2; and x is the number of oxygen atoms required to saturate the valencies of the other constituents.
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) | 1987-12-11 | 1988-06-11 | 1988-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-11 | 1992-06-11 | 1992-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-11 | 1996-06-11 | 1996-12-11 | $7700.00 | Window Closed / Lapsed |