US4171316A
Expired / Lapsed
US
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Preparation of maleic anhydride using a crystalline vanadium(IV)bis(metaphosphate) catalyst
Assignee: Atlantic Richfield Co
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Filing: 1978-03-24
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Granted: 1979-10-16
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Expires: 1998-03-24
Abstract
Abstract A process for the preparation of maleic anhydride in high yield and selectivity which comprises partially oxidizing an unsaturated aliphatic hydrocarbon selected from 1-butene, 2-butene and 1,3-butadiene or mixtures thereof in the vapor phase at elevated temperatures with oxygen or an oxygen-containing gas in the presence of a single phase vanadium(IV)bis(metaphosphate) catalyst having the formula VO(PO3)2. Preferably the reaction is carried out in the presence of steam to enhance the selectivity to maleic anhydride.
Inventors
- 👤 S. Erik Pedersen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:40
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/14; B01J27/186; B01J27/195; B01J27/198; B01J23/00; B01J23/16; B01J23/20; B01J23/22; C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/25; C07C51/252
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
84 words
A process for the preparation of maleic anhydride which comprises oxidizing an unsaturated aliphatic hydrocarbon selected from the group consisting of 1-butene, 2-butene and 1,3-butadiene or mixtures thereof in the vapor phase at temperatures in the range of about 300° C. to 600° C. and pressure of from about ambient pressures to 1000 psig with oxygen or an oxygen containing gas in the presence of a single phase crystalline vanadium(IV)bis(metaphosphate) catalyst having a surface area of from about 0.30 to 0.50 m 2 /g.
Claim 2
Dependent Claim
84 words
A process for the preparation of maleic anhydride which comprises oxidizing an unsaturated aliphatic hydrocarbon selected from the group consisting of 1-butene, 2-butene and 1,3-butadiene or mixtures thereof in the vapor phase at temperatures in the range of about 300° C. to 600° C. and pressure of from about ambient pressures to 1000 psig with oxygen or an oxygen containing gas in the presence of a single phase crystalline vanadium(IV)bis(metaphosphate) catalyst having a surface area of from about 0.30 to 0.50 m 2 /g.
Claim 3
Dependent Claim
12 words
A process according to claim 1 wherein the unsaturated hydrocarbon is n-butene.
Claim 4
Dependent Claim
28 words
A process according to claim 1 wherein the reaction is carried out in the presence of up to 50 volume percent steam added to the reactant feed stream.
Claim 5
Dependent Claim
22 words
A process according to claim 3 wherein from about 2 to 20 volume percent steam is added to the reactant feed stream.
Claim 6
Dependent Claim
20 words
A process according to claim 1 wherein the temperature is in the range of about 400° C. to 500° C.
Claim 7
Dependent Claim
12 words
A process according to claim 1 wherein the oxygen-containing gas is air.
Claim 8
Dependent Claim
78 words
A process for the preparation of maleic anhydride which comprises contacting a gaseous feed stream of from about 0.2 to 2 percent n-butene in air and from about 2 to 20 volume percent steam at a temperature of 400° C. to 500° C. with an activated single phase crystalline vanadium(IV)bis(metaphosphate) catalyst having a surface area of from about 0.30 to 0.50 m 2 /g. at an apparent contact time over the catalyst of from 0.5 to 10 seconds.
Claim 9
Dependent Claim
78 words
A process for the preparation of maleic anhydride which comprises contacting a gaseous feed stream of from about 0.2 to 2 percent n-butene in air and from about 2 to 20 volume percent steam at a temperature of 400° C. to 500° C. with an activated single phase crystalline vanadium(IV)bis(metaphosphate) catalyst having a surface area of from about 0.30 to 0.50 m 2 /g. at an apparent contact time over the catalyst of from 0.5 to 10 seconds.
Claim 10
Dependent Claim
33 words
A process according to claim 7 wherein the feed stream contains from about 1 to 1.5 percent n-butene in air and the contact time over the catalyst is from 1.5 to 4 seconds.
Claim 11
Dependent Claim
78 words
A process for the preparation of maleic anhydride which comprises contacting a gaseous feed stream of from about 0.2 to 2 percent 1,3-butadiene in air and from about 2 to 20 volume percent steam at a temperature of 400° C. to 500° C. with an activated single phase crystalline vanadium(IV)bis(metaphosphate) catalyst having a surface area of from about 0.30 to 0.50 m 2 /g. at an apparent contact time over the catalyst of from 0.5 to 10 seconds.
Claim 12
Dependent Claim
78 words
A process for the preparation of maleic anhydride which comprises contacting a gaseous feed stream of from about 0.2 to 2 percent 1,3-butadiene in air and from about 2 to 20 volume percent steam at a temperature of 400° C. to 500° C. with an activated single phase crystalline vanadium(IV)bis(metaphosphate) catalyst having a surface area of from about 0.30 to 0.50 m 2 /g. at an apparent contact time over the catalyst of from 0.5 to 10 seconds.
Claim 13
Dependent Claim
33 words
A process according to claim 9 wherein the feed stream contains from about 1 to 1.5 percent n-butene in air and the contact time over the catalyst is from 1.5 to 4 seconds.
References Cited (Backward Citations)
US3255211A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-10-15 | 1983-04-16 | 1983-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-15 | 1987-04-16 | 1987-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-15 | 1991-04-16 | 1991-10-16 | $7700.00 | Window Closed / Lapsed |