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US4435521A
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Heterogeneous process for preparing vanadium phosphorus oxygen containing catalyst composition
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1982-05-24
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Granted: 1984-03-06
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Expires: 2002-05-24
Abstract
Abstract A heterogeneous process for preparing a vanadium-phosphorus-oxygen containing catalyst for use in the preparation of carboxylic anhydrides is disclosed. This process employs an activation procedure in an air-hydrocarbon atmosphere.
Inventors
- 👤 Tai-Cheng Yang
- 👤 Krishna K. Rao
- 👤 I-Der Huang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:40
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/255; C07C51/265; B; B01; B01J; B01J23/00; B01J23/002; B01J27/00; B01J27/14; B01J27/186; B01J27/195; B01J27/198; B01J37/00; B01J37/08; C07C51/215; C07C51/25; C07C51/252; B01J2523/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
167 words
A process for preparing a catalyst composition comprising vanadium, phosphorus and oxygen capable of catalyzing the oxidation of hydrocarbons which comprises: (a) admixing to form a heterogeneous suspension at least one pentavalent vanadium compound with at least one organic alcohol in a manner and under conditions sufficient to condition said vanadium compound and reduce at least a portion of the pentavalent vanadium to a +4 valence state; (b) admixing at least one organic alcohol, said conditioned vanadium compound, and at least one phosphorus containing compound, in a manner and under conditions sufficient to form a heterogeneous suspension of a vanadium-phosphorus-oxygen containing catalyst precursor composition having a vanadium valence of from about 3.9 to about 4.7, and a phosphorus to vanadium atomic ratio of from about 0.5:1 to about 2:1; (c) separating said catalyst precursor composition from said admixture; and (d) activating said catalyst precursor composition in the absence of air alone by contacting it with an atmosphere comprising a mixture of air and at least one hydrocarbon.
Claim 2
Dependent Claim
167 words
A process for preparing a catalyst composition comprising vanadium, phosphorus and oxygen capable of catalyzing the oxidation of hydrocarbons which comprises: (a) admixing to form a heterogeneous suspension at least one pentavalent vanadium compound with at least one organic alcohol in a manner and under conditions sufficient to condition said vanadium compound and reduce at least a portion of the pentavalent vanadium to a +4 valence state; (b) admixing at least one organic alcohol, said conditioned vanadium compound, and at least one phosphorus containing compound, in a manner and under conditions sufficient to form a heterogeneous suspension of a vanadium-phosphorus-oxygen containing catalyst precursor composition having a vanadium valence of from about 3.9 to about 4.7, and a phosphorus to vanadium atomic ratio of from about 0.5:1 to about 2:1; (c) separating said catalyst precursor composition from said admixture; and (d) activating said catalyst precursor composition in the absence of air alone by contacting it with an atmosphere comprising a mixture of air and at least one hydrocarbon.
Claim 3
Dependent Claim
55 words
The process of claim 1 wherein the organic alcohol is isobutanol, the pentavalent vanadium compound is V 2 O 5 , the phosphorus containing compound is phosphoric acid, and the activation atmosphere is a non-explosive mixture of air and at least one hydrocarbon selected from the group consisting of methane, butane, butene, butadiene, and pentane.
Claim 4
Dependent Claim
78 words
The process of claim 2 wherein the vanadium pentoxide is conditioned by refluxing in isobutanol for a period of from about 1 to about 50 hours; the catalyst precursor composition is prepared by refluxing a heterogeneous suspension of the conditioned vanadium pentoxide in a liquid mixture comprising phosphoric acid and isobutanol for a period of from about 1 to about 50 hours; and the catalyst precursor composition is activated in a non-explosive gaseous mixture of air and butane.
Claim 5
Dependent Claim
19 words
The process of claim 1 wherein activation is conducted at temperatures of from about 300° to about 410° C.
Claim 6
Dependent Claim
19 words
The process of claim 1 wherein activation is conducted at temperatures of from about 350° to about 410° C.
Claim 7
Dependent Claim
19 words
The process of claim 1 wherein said activation atmosphere consists essentially of a gaseous mixture of air and hydrocarbon.
Claim 8
Dependent Claim
33 words
The process of claim 5 wherein activation is conducted in a non-explosive gaseous mixture comprising air and a hydrocarbon selected from the group consisting of methane, butane, butene, butadiene, pentane and mixtures thereof.
Claim 9
Dependent Claim
39 words
The process of claim 1 wherein activation is conducted in a gaseous mixture comprising air and from about 0.1 to about 1.8 mole % butane based on the total number of moles of the components in the gaseous mixture.
Claim 10
Dependent Claim
16 words
The process of claim 1 wherein the catalyst precursor is shaped into structures prior to activation.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-06 | 1987-09-05 | 1988-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-06 | 1991-09-05 | 1992-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-06 | 1995-09-05 | 1996-03-06 | $7700.00 | Window Closed / Lapsed |