US4174459A
Expired / Lapsed
US
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Process for producing methacrylic acid
Assignee: Tosoh Corp
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Filing: 1977-01-04
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Granted: 1979-11-13
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Expires: 1997-01-04
Abstract
Abstract Methacrylic acid is produced by the vapor phase oxidation of methacrolein in the presence of a complex oxide catalyst having the formula: MoaVbPcCedCueXfOg wherein X represents at least one of the elements selected from the group of Mn, Fe, Co, Sn and Te and a, b, c, d, e, f and g represent atomic ratios wherein a=12; b=0.01 to 2; c=0.1 to 3; d=0.01 to 2; e=0.01 to 2; f=0 to 2 and g is determined by the valences of the non-oxygen components of the catalyst and is usually in a range of 38 to 50. The catalyst can be optionally reduced by subjecting the metal oxide mixture to at least one reducing organic material selected from the group consisting of dibasic carboxylic acids, oxycarboxylic acids, and polyols.
Inventors
- 👤 Teruhisa Sakamoto
- 👤 Taketoshi Nagahama
- 👤 Shigeo Nakamura
- 👤 Keiichi Kihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:07
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J23/88; B01J23/887; B01J23/8871; B01J23/002; B01J23/8875; 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: 12
Claim 1
Independent Claim
110 words
A process for producing methacrylic acid, which comprises: reacting methacrolein with molecular oxygen or a molecular oxygen-containing gas in the vapor phase in the presence of a complex oxide catalyst having the formula: Mo.sub.a V.sub.b P.sub.c Ce.sub.d Cu.sub.e X.sub.f O.sub.g wherein X represents at least one element selected from the group consisting of manganese, iron, cobalt, tin and tellurium and wherein a, b, c, d, e and f represent atomic ratios such that when a=12; b=0.01 to 2; c=0.1 to 3; d=0.01 to 2; e=0.01 to 2; f=0 to 2 and g assumes a value depending upon the valences of the other components in the range of 38 to 50.
Claim 2
Dependent Claim
110 words
A process for producing methacrylic acid, which comprises: reacting methacrolein with molecular oxygen or a molecular oxygen-containing gas in the vapor phase in the presence of a complex oxide catalyst having the formula: Mo.sub.a V.sub.b P.sub.c Ce.sub.d Cu.sub.e X.sub.f O.sub.g wherein X represents at least one element selected from the group consisting of manganese, iron, cobalt, tin and tellurium and wherein a, b, c, d, e and f represent atomic ratios such that when a=12; b=0.01 to 2; c=0.1 to 3; d=0.01 to 2; e=0.01 to 2; f=0 to 2 and g assumes a value depending upon the valences of the other components in the range of 38 to 50.
Claim 3
Dependent Claim
51 words
The process of claim 1, wherein the elemental atomic ratios of said empirical formula are a=12, b=0.1 to 1.0, c=1.0 to 2.5, d=0.02 to 0.8, e=0.1 to 1.0; f=0.1 to 1.0 and g assumes a value depending upon the valences of the other components in the range of 38 to 50.
Claim 4
Dependent Claim
40 words
The process of claim 1, wherein the catalyst is prepared by the addition of a reducing organic material to the components from which said catalyst is formed selected from the group consisting of dibasic carboxylic acids, oxycarboxylic acids and polyols.
Claim 5
Dependent Claim
30 words
The process of claim 3, wherein said reducing organic material is selected from the group consisting of oxalic acid, succinic acid, tartaric acid, citric acid, lactic acid, mannitol and pyrogallol.
Claim 6
Dependent Claim
13 words
The process of claim 1, wherein the catalyst is supported on a carrier.
Claim 7
Dependent Claim
21 words
The process of claim 1, wherein the catalyst is calcined at a temperature in the range of 300° to 450° C.
Claim 8
Dependent Claim
23 words
The process of claim 1, wherein said oxidation of methacrolein is conducted at a temperature in the range of 240° to 380° C.
Claim 9
Dependent Claim
25 words
The process of claim 1, wherein said oxidation of methacrolein is conducted at an apparent contact time in the range of 1 to 4 seconds.
Claim 10
Dependent Claim
20 words
The process according to claim 1, wherein molecular oxygen or molecular oxygen-containing gas is supplied in the form of air.
Claim 11
Dependent Claim
19 words
The process according to claim 1, wherein the feed gas comprises a reaction gas mixture prepared by oxidizing isobutylene.
Claim 12
Dependent Claim
34 words
The process according to claim 1, wherein said oxidation of methacrolein is conducted in the presence of an inert gaseous diluent which is selected from the group consisting of steam, nitrogen and carbon dioxide.
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) | 1982-11-12 | 1983-05-14 | 1983-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-12 | 1987-05-14 | 1987-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-12 | 1991-05-14 | 1991-11-13 | $7700.00 | Window Closed / Lapsed |