Patent US2065352A successfully refreshed from Google Patents.
Patent US4097501A successfully refreshed from Google Patents.
US4097501A
Expired / Lapsed
US
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Use of coated catalysts in the preparation of maleic anhydride
Assignee: Standard Oil Co
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Filing: 1976-05-19
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Granted: 1978-06-27
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Expires: 1996-05-19
Abstract
Abstract Very desirable temperature control and selectivity are obtained in the oxidation of benzene to maleic anhydride using an oxidation catalyst of an essentially inert support of at least 20 microns containing on its outer surface a coating of a catalytically active oxide material or a catalytically active oxide material and an oxide support.
Inventors
- 👤 Serge R. Dolhyj
- 👤 Ernest C. Milberger
- 👤 Sandra R. Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:43
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/02; B01J37/0215; B01J37/0221; C; C07; C07C; C07C51/00; C07C51/16; C07C51/31; C07C51/313; B01J23/00; B01J23/16; B01J23/20; B01J23/22; B01J23/24; B01J23/28; B01J27/00; B01J27/14; B01J27/186; B01J27/195; B01J27/198; B01J27/199
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
208 words
In a process for the preparation of maleic anhydride by the reaction of benzene with air, and optionally steam, in the presence of an oxide catalyst which is useful in a fixed-bed reactor, the improvement comprising: using a catalyst consisting of (a) an essentially inert, at least partially porous support having a particle size of at least 20 microns, wherein said support has an outer surface, said support being selected from the group consisting of silica, alumina, silicon carbide, alumina-silica, titania and zirconia; and (b) a coating consisting essentially of a catalytically active oxide material on said outer surface of said support which strongly adheres to said outer surface of said support, wherein said catalytically active oxide material contains at least an oxide of vanadium or an oxide of molybdenum, and wherein said catalyst is prepared by (1) contacting the support with a liquid to produce a partially wet support, said partially wet support being one that does not have the appearance of having liquid on the outer surface of said support; and (2) contacting said partially wet support with a powder of a catalytically active material to produce a support having a strongly adherent coating of said catalytically active material on the outer surface of said support.
Claim 2
Dependent Claim
208 words
In a process for the preparation of maleic anhydride by the reaction of benzene with air, and optionally steam, in the presence of an oxide catalyst which is useful in a fixed-bed reactor, the improvement comprising: using a catalyst consisting of (a) an essentially inert, at least partially porous support having a particle size of at least 20 microns, wherein said support has an outer surface, said support being selected from the group consisting of silica, alumina, silicon carbide, alumina-silica, titania and zirconia; and (b) a coating consisting essentially of a catalytically active oxide material on said outer surface of said support which strongly adheres to said outer surface of said support, wherein said catalytically active oxide material contains at least an oxide of vanadium or an oxide of molybdenum, and wherein said catalyst is prepared by (1) contacting the support with a liquid to produce a partially wet support, said partially wet support being one that does not have the appearance of having liquid on the outer surface of said support; and (2) contacting said partially wet support with a powder of a catalytically active material to produce a support having a strongly adherent coating of said catalytically active material on the outer surface of said support.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein the coating is about 10 to about 100 percent by weight of the inert support.
Claim 4
Dependent Claim
42 words
The process of claim 1 wherein said inert support is capable of absorbing at least 1% by weight water based upon the weight of the support, but does not have the appearance of having water on the outer surface of the support.
Claim 5
Dependent Claim
20 words
The process of claim 1 wherein the active catalytic oxide material contains at least the oxides of V and Mo.
Claim 6
Dependent Claim
46 words
The process of claim 1 wherein the catalytically active oxide material additionally contains one or more members of the group consisting of oxides of alkali metals, alkaline earth metals, chromium, tungsten, manganese, iron, cobalt, nickel, copper, zinc, indium, tellurium, antimony, tin, bismuth, silver, arsenic and phosphorus.
Claim 7
Dependent Claim
22 words
The process of claim 1 wherein the active catalytic oxide material contains at least the oxides of Mo, V, Sn, and P.
Claim 8
Dependent Claim
18 words
The process of claim 5 wherein the catalytically active oxide material does not contain an oxide of phosphorus.
Claim 9
Dependent Claim
15 words
The process of claim 1 wherein the reaction is conducted in the presence of steam.
Claim 10
Dependent Claim
12 words
The process of claim 1 wherein the inert support is essentially spherical.
References Cited (Backward Citations)
US2954385A
Cited
US3464930A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-26 | 1981-12-26 | 1982-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-26 | 1985-12-26 | 1986-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-26 | 1989-12-26 | 1990-06-27 | $7700.00 | Window Closed / Lapsed |