Patent DE666465C successfully refreshed from Google Patents.
Patent US4021427A successfully refreshed from Google Patents.
US4021427A
Expired / Lapsed
US
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Oxidation of 1,3-butadiene to maleic anhydride using a catalyst containing Mo, Sb, V and either one or both of Li and Ce
Assignee: Standard Oil Co
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Filing: 1975-12-15
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Granted: 1977-05-03
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Expires: 1995-12-15
Abstract
Abstract Maleic anhydride and acrylic acid are produced by the oxidation of 1,3-butadiene, n-butylenes, crotonaldehyde and furan with molecular oxygen in the vapor phase in the presence of a catalytic oxide of antimony, molybdenum, vanadium and lithium, cerium, or mixture thereof, wherein one element selected from the group consisting of calcium, iron, tungsten, magnesium, aluminum and nickel is optionally added as a reducing agent. The oxidation of 1,3-butadiene in the presence of a catalyst wherein tungsten metal is used as a reducing agent gives especially desirable high yields to maleic anhydride.
Inventors
- 👤 Serge R. Dolhyj
- 👤 Ernest C. Milberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:37
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/25; C07C51/252; B; B01; B01J; B01J23/00; B01J23/002; B01J23/16; B01J23/18; B01J23/20; B01J23/22; B01J23/24; B01J23/28; B01J2523/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
126 words
In the process for the synthesis of maleic anhydride by contacting 1,3-butadiene and molecular oxygen with an oxidation catalyst at a temperaure of about 250° C. to about 600° C. the improvement comprising using as the oxidation catalyst a catalyst containing Y.sub.a Sb.sub.b Mo.sub.c V.sub.d Z.sub.e O.sub.x wherein Y is lithium, cerium or a mixture thereof; Z ia a metal selected from the group consisting of tungsten, magnesium, aluminum and nickel or an oxide of tungsten, magnesium, aluminum and nickel; and wherein a and d are numbers from about 0.01 to about 1.0; b and c are numbers from about 1 to about 9; e is a number from 0 to 1; x is a number which satisfies the valence requirements of the other elements present.
Claim 2
Dependent Claim
126 words
In the process for the synthesis of maleic anhydride by contacting 1,3-butadiene and molecular oxygen with an oxidation catalyst at a temperaure of about 250° C. to about 600° C. the improvement comprising using as the oxidation catalyst a catalyst containing Y.sub.a Sb.sub.b Mo.sub.c V.sub.d Z.sub.e O.sub.x wherein Y is lithium, cerium or a mixture thereof; Z ia a metal selected from the group consisting of tungsten, magnesium, aluminum and nickel or an oxide of tungsten, magnesium, aluminum and nickel; and wherein a and d are numbers from about 0.01 to about 1.0; b and c are numbers from about 1 to about 9; e is a number from 0 to 1; x is a number which satisfies the valence requirements of the other elements present.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein a is 0.1 to about 0.9.
Claim 4
Dependent Claim
13 words
The process of claim 1 wherein d is about 0.01 to about 0.5
Claim 5
Dependent Claim
13 words
The process of claim 1 wherein the temperature is 325° to 480° C.
Claim 6
Dependent Claim
15 words
The process of claim 1 wherein Z is added to the catalyst as tungten metal.
Claim 7
Dependent Claim
24 words
The process of claim 5 wherein b and c are numbers of about 2.0 to about 8.0 and e is 0.001 to about 0.2.
Claim 8
Dependent Claim
22 words
The process of claim 6 wherein the catalyst is Li 0 .1 SbMo 3 V 0 .1 O x +W° 0 .6
Claim 9
Dependent Claim
22 words
The process of claim 6 wherein the catalyst is Ce 0 .1 SbMo 3 V 0 .1 O x +W° 0 .06.
References Cited (Backward Citations)
US2206377A
Cited
US3156706A
Cited
FR1291659A
Cited
FR1601955A
Cited
SU385957A1
Cited
US3904653A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-02 | 1980-11-01 | 1981-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-02 | 1984-11-01 | 1985-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-02 | 1988-11-01 | 1989-05-03 | $7700.00 | Window Closed / Lapsed |