US3904653A
Expired / Lapsed
US
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Synthesis of maleic anhydride
Assignee: Standard Oil Co
•
Filing: 1972-05-05
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Granted: 1975-09-09
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Expires: 1992-05-05
Abstract
Abstract Catalysts containing antimony and molybdenum are promoted by the addition of iron or vanadium or mixture thereof to give very desirable catalysts for the preparation of maleic anhydride from 1,3-butadiene, n-butylenes, crotonaldehyde and furan.
Inventors
- 👤 Ernest C Milberger
- 👤 Serge R Dolhyj
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:54
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J23/88; B01J23/887; B01J23/8876; B01J23/16; B01J23/24; B01J23/28; B01J23/30; B01J23/8877; C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/23; C07C51/25; C07C51/252; C07C51/31; C07C51/313; B01J2523/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
34 words
IN THE PROCESS FOR PREPARING MALEIC ANHYDRIDE BY CONTACTING 1,3-BUTADIENE AND MOLECULAR OXYGEN WITH AN OXIDATION CATALYST A TEMPERATURE OF ABOUT 250* TO ABOUT 600*C, THE IMPROVEMENT COMPRISING: USING AS THE OXIDATION CATALYST CONTAINING
Claim 2
Dependent Claim
34 words
IN THE PROCESS FOR PREPARING MALEIC ANHYDRIDE BY CONTACTING 1,3-BUTADIENE AND MOLECULAR OXYGEN WITH AN OXIDATION CATALYST A TEMPERATURE OF ABOUT 250* TO ABOUT 600*C, THE IMPROVEMENT COMPRISING: USING AS THE OXIDATION CATALYST CONTAINING
Claim 3
Dependent Claim
13 words
The process of claim 1 wherein c is about 0.01 to about 0.5.
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
18 words
The process of claim 1 wherein both c and d are numbers of about 0.01 to about 0.5.
Claim 6
Dependent Claim
17 words
The process of claim 1 wherein Z is added to the catalyst as molybdenum or tungsten metal.
Claim 7
Dependent Claim
24 words
The process of claim 5 wherein a and b are numbers of about 2 to about 8 and e is 0.001 to about 0.2.
Claim 8
Dependent Claim
18 words
The process of claim 6 wherein both c and d are numbers of about 0.01 to about 0.5.
Claim 9
Dependent Claim
14 words
The process of claim 1 wherein the temperature is about 325* to about 450*C.
Claim 10
Dependent Claim
69 words
The process of claim 1 wherein the catalyst is prepared by a. reacting an aqueous slurry containing at least molybdenum oxide with a reducing agent capable of reducing Mo 6 to obtain a slurry having a bluish color; b. reacting the product of step (a) with antimony oxide to obtain a slurry having a darker color; and c. recovering a solid catalyst from the mixture formed in step (b).
Claim 11
Dependent Claim
22 words
The process of claim 1 wherein at least some of the molybdenum in the catalyst is in a valence state below +6.
References Cited (Backward Citations)
US3702868A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |