US4045478A
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Method for the preparation of methacrylic acid
Assignee: Ube Corp
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Filing: 1976-02-18
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Granted: 1977-08-30
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Expires: 1996-02-18
Abstract
Abstract Methacrylic acid can be produced from methacrolein with a high reaction percentage of methacrolein and a high selectivity percentage of methacrylic acid, by bringing a reaction feed containing methacrolein and molecular oxygen into contact with an oxidation catalyst at a temperature of 200 to 450° C, the oxidation catalyst comprising oxides of molybdenum, phosphorus, calcium, at least one element selected from the group consisting of arsenic, bismuth, tin, titanium, tantalum and boron and, optionally, at least one element selected from the group consisting of antimony, niobium and magnesium.
Inventors
- 👤 Sumio Umemura
- 👤 Kyoji Ohdan
- 👤 Kenichi Suzuki
- 👤 Fumio Adachi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:11
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/14; B01J27/186; B01J23/00; B01J23/16; B01J23/24; B01J23/28; C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/25; C07C51/252
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
138 words
A method for the preparation of methacrylic acid by oxidation of methacrolein, comprising bringing a reaction feed containing methacrolein in vapor phase and molecular oxygen into contact at a temperature of 200°-450° C with an oxidation catalyst consisting of an oxide composition of the formula (I): [mo.sub.a P.sub.b Ca.sub.c X.sub.d O.sub.e ] Mo.sub.a P.sub.b Ca.sub.c As.sub.d O.sub.e (I) wherein the subscripts a, b, c and d respectively denote the numbers of the respective element atoms, said numbers being within the ranges, a-5 to 15, b = 1 to 3,c = 0.1 to 3, d = 0.1 to 3, and the subscript e represents the number of oxygen atoms which corresponds to the oxides formed from the above mentioned elements and satisfies the average valency of the elements, said number e being within the range of 16 to 60.
Claim 2
Independent Claim
138 words
A method for the preparation of methacrylic acid by oxidation of methacrolein, comprising bringing a reaction feed containing methacrolein in vapor phase and molecular oxygen into contact at a temperature of 200°-450° C with an oxidation catalyst consisting of an oxide composition of the formula (I): [mo.sub.a P.sub.b Ca.sub.c X.sub.d O.sub.e ] Mo.sub.a P.sub.b Ca.sub.c As.sub.d O.sub.e (I) wherein the subscripts a, b, c and d respectively denote the numbers of the respective element atoms, said numbers being within the ranges, a-5 to 15, b = 1 to 3,c = 0.1 to 3, d = 0.1 to 3, and the subscript e represents the number of oxygen atoms which corresponds to the oxides formed from the above mentioned elements and satisfies the average valency of the elements, said number e being within the range of 16 to 60.
Claim 3
Dependent Claim
52 words
A method according to claim 1, wherein said oxidation catalyst is prepared by providing an aqueous liquid containing therein a molybdenum-containing compound, a phosphorus-containing compound, a calcium-containing compound and an arsenic compound liquid to form a solid material, and; calcining the dried solid material at a temperature of 300° to 500° C.
Claim 4
Dependent Claim
32 words
A method according to claim 1, wherein said oxidation catalyst is supported on a carrier selected from the group consisting of diatomaceous earth, silica, alumina, silicon carbide, silica-alumina and water-soluble silica sol.
Claim 5
Dependent Claim
15 words
A method according to claim 1, wherein said oxidation catalyst is in a fixed bed.
Claim 6
Independent Claim
167 words
A method for the preparation of methacrylic acid by oxidation of methacrolein, comprising bringing a reaction feed containing methacrolein in vapor phase and molecular oxygen into contact at a temperature of 200°-450° C with an oxidation catalyst consisting of an oxide composition of the formula (II): [mo.sub.a P.sub.b Ca.sub.c X.sub.f Y.sub.g O.sub.e ] Mo.sub.a P.sub.b Ca.sub.c As.sub.f Y.sub.g O.sub.e (II) wherein Y represents at least one member selected from the group consisting of antimony, niobium and magnesium atoms, the subscripts a, b, c, f and g respectively denote the numbers of the respective element atoms, said numbers being within the ranges, a = 5 to 15, b, = 1 to 3, c = 0.1 to 3, f = 0.1 to 3 and g = 0.1 to 3, and the subscript e represents the number of oxygen atoms which corresponds to the oxides formed from the above mentioned elements and satisfies the average valency of the elements, said number e being within a range of 16 to 68.
Claim 7
Independent Claim
167 words
A method for the preparation of methacrylic acid by oxidation of methacrolein, comprising bringing a reaction feed containing methacrolein in vapor phase and molecular oxygen into contact at a temperature of 200°-450° C with an oxidation catalyst consisting of an oxide composition of the formula (II): [mo.sub.a P.sub.b Ca.sub.c X.sub.f Y.sub.g O.sub.e ] Mo.sub.a P.sub.b Ca.sub.c As.sub.f Y.sub.g O.sub.e (II) wherein Y represents at least one member selected from the group consisting of antimony, niobium and magnesium atoms, the subscripts a, b, c, f and g respectively denote the numbers of the respective element atoms, said numbers being within the ranges, a = 5 to 15, b, = 1 to 3, c = 0.1 to 3, f = 0.1 to 3 and g = 0.1 to 3, and the subscript e represents the number of oxygen atoms which corresponds to the oxides formed from the above mentioned elements and satisfies the average valency of the elements, said number e being within a range of 16 to 68.
Claim 8
Dependent Claim
71 words
A method according to claim 5, wherein said oxidation catalyst is prepared by providing an aqueous liquid containing therein a molybdenum-containing compound, a phosphorus-containing compound, a calcium containing compound, an arsenic compound and at least one compound selected from the group consisting of antimony-, niobium- and magnesium-containing compounds; evaporating the aqueous liquid to form a solid material and; calcining the dried solid material at a temperature of 300° to 500° C.
Claim 9
Independent Claim
159 words
A method for the preparation of methacrylic acid by oxidation of methacrolein, comprising bringing a reaction feed containing methacrolein in vapor phase and molecular oxygen into contact at a temperature of 200°- 450° C with an oxidation catalyst consisting of an oxide composition of the formula (III): mo.sub.a P.sub.b Ca.sub.c As.sub.h Z.sub.i O.sub.e (III) wherein Z represents at least one member selected from the group consisting of bismuth, tin, titanium, tantalum, boron, antimony, niobium and magnesium atoms, the subscripts a, b, c, h and i respectively represent the numbers of the respective element atoms, said numbers being within the following ranges, a=5 to 15, b=1 to 3, c=0.1 to 3, h=0.1 to 3, and i =0.1 to 3, and the subscript e represents the number of oxygen atoms which correspond to the oxides formed from the above mentioned elements and satisfies the average valency of the elements involved, the number e being within a range of 16 to 68.
Claim 10
Independent Claim
159 words
A method for the preparation of methacrylic acid by oxidation of methacrolein, comprising bringing a reaction feed containing methacrolein in vapor phase and molecular oxygen into contact at a temperature of 200°- 450° C with an oxidation catalyst consisting of an oxide composition of the formula (III): mo.sub.a P.sub.b Ca.sub.c As.sub.h Z.sub.i O.sub.e (III) wherein Z represents at least one member selected from the group consisting of bismuth, tin, titanium, tantalum, boron, antimony, niobium and magnesium atoms, the subscripts a, b, c, h and i respectively represent the numbers of the respective element atoms, said numbers being within the following ranges, a=5 to 15, b=1 to 3, c=0.1 to 3, h=0.1 to 3, and i =0.1 to 3, and the subscript e represents the number of oxygen atoms which correspond to the oxides formed from the above mentioned elements and satisfies the average valency of the elements involved, the number e being within a range of 16 to 68.
Claim 11
Dependent Claim
75 words
A method according to claim 7, wherein said oxidation catalyst is prepared by providing an aqueous liquid containing therein a molybdenum-containing compound, a phosphorus-containing compound, a calcium-containing compound, an arsenic-containing compond and at least one compound selected from the group consisting of bisumth-, tin-, titanium-, tantalum-, boron-, antimony-, niobium- and magnesium-containing compounds; evaporating said aqueous solution to form a solid material and; calcining the dried solid material at a temperature of 300° to 500° C.
Claim 12
Dependent Claim
17 words
A method according to claim 7, wherein said Z in the formula (III) is a boron atom.
Claim 13
Dependent Claim
17 words
A method according to claim 7, wherein said Z in the formula (III) is an antimony atom.
References Cited (Backward Citations)
US3686294A
Cited
US3865873A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-29 | 1981-02-28 | 1981-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-29 | 1985-02-28 | 1985-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-29 | 1989-02-28 | 1989-08-30 | $7700.00 | Window Closed / Lapsed |