US4042623A
Expired / Lapsed
US
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Method of manufacturing methacrylic acid and an oxidation catalyst
Assignee: Nippon Kayaku Co Ltd
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Filing: 1975-09-16
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Granted: 1977-08-16
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Expires: 1995-09-16
Abstract
Abstract A catalyst for the oxidation of methacrolein into methylacrylic acid in the presence of steam having the composition: Pd.sub.a P.sub.b Sb.sub.c X.sub.d O.sub.e wherein, Pd, P, Sb and O denote palladium, phosphorus, antimony and oxygen respectively, X denotes at least one element selected from the group consisting of bismuth, lead, chromium, iron, nickel, cobalt, manganese, tin, uranium and barium, the subscripts a, b, c, d and e denote the numbers of the Pd, P, Sb, X and O atoms, with the proviso that the elements are present in a ratio so that when a is 1, b is 1 to 42, c is 0.1 to 15, d is 0 to 15 and e is a value which is automatically determined from the valencies of the other elements.
Inventors
- 👤 Masanobu Ogawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:29
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/14; B01J27/186; B01J27/185; B01J27/1856; C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/25; C07C51/252
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
112 words
A catalyst having the following composition: Pd.sub.a P.sub.b Sb.sub.c X.sub.d O.sub.e wherein, Pd, P, Sb and O denote palladium, phosphorus, antimony and oxygen, respectively, X denotes at least one element selected from the group consisting of bismuth, lead, chromium, iron, nickel, cobalt, manganese, tin, uranium and barium, the subscripts a, b, c, d and e denote the numbers of the Pd, P, Sb, X and O atoms with the proviso that the elements are present in a ratio so that when a is 1, then b is 1 to 42, c is 0.1 to 15, d is 0 to 15 and e is automatically determined from the valencies of the other elements.
Claim 2
Dependent Claim
112 words
A catalyst having the following composition: Pd.sub.a P.sub.b Sb.sub.c X.sub.d O.sub.e wherein, Pd, P, Sb and O denote palladium, phosphorus, antimony and oxygen, respectively, X denotes at least one element selected from the group consisting of bismuth, lead, chromium, iron, nickel, cobalt, manganese, tin, uranium and barium, the subscripts a, b, c, d and e denote the numbers of the Pd, P, Sb, X and O atoms with the proviso that the elements are present in a ratio so that when a is 1, then b is 1 to 42, c is 0.1 to 15, d is 0 to 15 and e is automatically determined from the valencies of the other elements.
Claim 3
Dependent Claim
33 words
The catalyst according to claim 1, wherein b is from 1 to 28, c is 0.3 to 10, d is 0 to 10 and e is 5 to 85 when a is 1.
Claim 4
Dependent Claim
10 words
The catalyst according to claim 1, wherein X is bismuth.
Claim 5
Dependent Claim
10 words
The catalyst according to claim 1, wherein X is lead.
Claim 6
Dependent Claim
10 words
The catalyst according to claim 1 wherein X is barium.
Claim 7
Independent Claim
146 words
A method of manufacturing methacrylic acid by the oxidation of methacrolein with molecular oxygen or a gas containing molecular oxygen in the presence of steam, which method is characterized by using a catalyst having the following composition: Pd.sub.a P.sub.b Sb.sub.c X.sub.d O.sub.e wherein, Pd, P, Sb and O denote palladium, phosphorus, antimony and oxygen respectively, X denotes at least one element selected from the group consisting of bismuth, lead, chromium, iron, nickel, cobalt, manganese, tin, uranium and barium, the subscripts a, b, c, d and e denote the numbers of the pd, P, Sb, X and O atoms, with the proviso that the elements are present in a ratio so that when a is 1, b is 1 to 42, c is 0.1 to 15, d is 0 to 15 and e is a value which is automatically determined from the valencies of the other elements.
Claim 8
Independent Claim
146 words
A method of manufacturing methacrylic acid by the oxidation of methacrolein with molecular oxygen or a gas containing molecular oxygen in the presence of steam, which method is characterized by using a catalyst having the following composition: Pd.sub.a P.sub.b Sb.sub.c X.sub.d O.sub.e wherein, Pd, P, Sb and O denote palladium, phosphorus, antimony and oxygen respectively, X denotes at least one element selected from the group consisting of bismuth, lead, chromium, iron, nickel, cobalt, manganese, tin, uranium and barium, the subscripts a, b, c, d and e denote the numbers of the pd, P, Sb, X and O atoms, with the proviso that the elements are present in a ratio so that when a is 1, b is 1 to 42, c is 0.1 to 15, d is 0 to 15 and e is a value which is automatically determined from the valencies of the other elements.
Claim 9
Dependent Claim
32 words
The method according to claim 6, wherein b is 1 to 28, c is 0.3 to 10, d is 0 to 10 and e is 5 to 85 when a is 1.
Claim 10
Dependent Claim
10 words
The method according to claim 6, wherein X is bismuth.
Claim 11
Dependent Claim
10 words
The method according to claim 6, wherein X is lead.
Claim 12
Dependent Claim
10 words
The method according to claim 6, wherein X is barium.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-15 | 1981-02-14 | 1981-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-15 | 1985-02-14 | 1985-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-15 | 1989-02-14 | 1989-08-16 | $7700.00 | Window Closed / Lapsed |