US3976688A
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Process for preparing unsaturated carboxylic acids
Assignee: Nippon Shokubai Co Ltd
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Filing: 1974-11-14
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Granted: 1976-08-24
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Expires: 1994-11-14
Abstract
Abstract A process for the preparation of an unsaturated carboxylic acid which comprises reacting an unsaturated aldehyde with molecular oxygen in the vapor phase in the presence of an oxidation catalyst composition having the following empirical formula Mo.sub.a P.sub.b L.sub.c T.sub.d O.sub.e wherein L is at least one element selected from the group consisting of Rb, Cs and K; T is at least one element selected from the group consisting of Ba, Cd, W, Bi, Nb, B, Pb and Pd; and a, b, c, d, and e each represent the number of atoms of each element; the atomic ratio of a:b:c:d is 12:0.1-8:0.1-8:0.1-8 and e is the number of oxygen atoms determined by the valence requirement of the other elements present.
Inventors
- 👤 Shinichi Akiyama
- 👤 Haruhisa Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:15
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/14; B01J27/186; B01J23/00; B01J23/16; B01J23/24; B01J23/28; B01J23/31; C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/25; C07C51/252
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
171 words
A process for the preparation of an unsaturated carboxylic acid which comprises reacting an unsaturated aldehyde selected from acrolein and methacrolein with molecular oxygen in the vapor phase in the presence of an oxidation catalyst composition consisting essentially of a catalytic oxide of molybdenum, phosphorus, at least one element selected from the group consisting of rubidium, cesium and potassium, and at least one element selected from the group consisting of barium, cadmium, tungsten, bismuth, niobium, boron, lead and palladium, the catalyst composition having the following empirical formula Mo.sub.a P.sub.b L.sub.c T.sub.d O.sub.e wherein L is at least one element selected from the group consisting of Rb, Cs and K; T is at least one element selected from the group consisting of Ba, Cd, W, Bi, Nb, B, Pb and Pd; and a, b, c, d and e each represent the number of atoms of each element: the atomic ratio of a:b:c:d is 12:0.1-8:0.1-8:0.1-8 and e is the number of oxygen atoms determined by the valence requirement of the other elements present.
Claim 2
Dependent Claim
171 words
A process for the preparation of an unsaturated carboxylic acid which comprises reacting an unsaturated aldehyde selected from acrolein and methacrolein with molecular oxygen in the vapor phase in the presence of an oxidation catalyst composition consisting essentially of a catalytic oxide of molybdenum, phosphorus, at least one element selected from the group consisting of rubidium, cesium and potassium, and at least one element selected from the group consisting of barium, cadmium, tungsten, bismuth, niobium, boron, lead and palladium, the catalyst composition having the following empirical formula Mo.sub.a P.sub.b L.sub.c T.sub.d O.sub.e wherein L is at least one element selected from the group consisting of Rb, Cs and K; T is at least one element selected from the group consisting of Ba, Cd, W, Bi, Nb, B, Pb and Pd; and a, b, c, d and e each represent the number of atoms of each element: the atomic ratio of a:b:c:d is 12:0.1-8:0.1-8:0.1-8 and e is the number of oxygen atoms determined by the valence requirement of the other elements present.
Claim 3
Dependent Claim
11 words
The process of claim 1, wherein the unsaturated aldehyde is acrolein.
Claim 4
Dependent Claim
11 words
The process of claim 1, wherein the unsaturated aldehyde is methacrolein.
Claim 5
Dependent Claim
13 words
The process of claim 1, wherein the reaction temperature is 300° to 500°C.
Claim 6
Dependent Claim
13 words
The process of claim 1, wherein the source of molecular oxygen is air.
Claim 7
Dependent Claim
16 words
The process of claim 1, wherein an inert diluent gas is introduced into the reaction zone.
Claim 8
Dependent Claim
20 words
The process of claim 1, wherein the catalyst is diluted with an inert diluent or supported on an inert carrier.
Claim 9
Dependent Claim
13 words
The process of claim 1, wherein the atomic ratio of a:b:c:d is 12:0.3-5:0.3-5:0.3-5.
Claim 10
Dependent Claim
9 words
The process of claim 1, wherein L is Rb.
Claim 11
Dependent Claim
9 words
The process of claim 1, wherein L is Cs.
Claim 12
Dependent Claim
9 words
The process of claim 1, wherein L is K.
Claim 13
Dependent Claim
9 words
The process of claim 1 wherein T is Ba.
Claim 14
Dependent Claim
9 words
The process of claim 1 wherein T is Cd.
Claim 15
Dependent Claim
9 words
The process of claim 1 wherein T is Pd.
Claim 16
Dependent Claim
17 words
The process of claim 1 wherein said catalyst contains both Rb and Cs and T is Cd.
Claim 17
Dependent Claim
16 words
The process of claim 1 wherein said catalyst contains Ba and Cd and L is Rb.
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) | 1979-08-24 | 1980-02-23 | 1980-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-24 | 1984-02-23 | 1984-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-24 | 1988-02-23 | 1988-08-24 | $7700.00 | Window Closed / Lapsed |