US4154703A
Expired / Lapsed
US
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Process for the preparation of maleic anhydride catalyst
Assignee: Ube Corp
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Filing: 1977-07-29
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Granted: 1979-05-15
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Expires: 1997-07-29
Abstract
Abstract Maleic anhydride is prepared by the catalytic oxidation of unsaturated hydrocarbons having 4 to 6 carbon atoms, at a temperature of from 350 DEG to 500 DEG C., in the presence of a catalyst which is produced by a method wherein a mixture of a titanium oxide and a vanadium compound in an atomic ratio of from 1 to 15 is calcined at a temperature of from 630 DEG to 1000 DEG C. to prepare a precursory catalyst, and wherein a gas mixture containing an organic phosphorus compound and a carrier gas is brought into contact with a mass of the percursory catalyst at a supply rate of the phosphorus compound being from 0.01 to 10 millimoles/hr per 1 ml of the mass of the percursory catalyst and at a temperature of from 350 DEG to 600 DEG C. during when a total amount of from 0.3 to 30 millimoles of the phosphorus compound per 1 ml of the mass of the precursory catalyst passes through the mass of the precursory catalyst.
Inventors
- 👤 Sumio Umemura
- 👤 Kyoji Ohdan
- 👤 Fumihiko Sakai
- 👤 Yasuo Bando
- 👤 Masataka Fuzinaga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:08
CPC Classifications
B; B01; B01J; B01J31/00; B01J31/02; B01J31/0234; B01J31/0255; B01J31/0257; B01J31/0258; B01J23/00; B01J23/16; B01J23/20; B01J23/22; B01J31/0259; B01J31/0267; B01J31/26; B01J31/36; B01J31/38; C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/25; C07C51/252; B01J2231/00; B01J2231/70; B01J31/16; B01J31/24
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
188 words
A method for producing a catalyst usable for the preparation of maleic anhydride by catalytic oxidation of unsaturated hydrocarbon having 4 to 6 carbon atoms, comprising mixing a titanium oxide and a vanadium compound, in an atomic ratio of Ti to V of from 1 to 15, said vanadium compound being selected from the group consisting of vanadium oxides, vanadium halides, metavanadic acid, ammonium vanadate and vanadium oxychlorides, calcining said mixture at a temperature of from 630° to 1000° C. to form a precursory catalyst, and bringing a gas mixture containing an organic phosphorus compound selected from the group consisting of phosphines, trialkyl phosphates and trialkyl phosphites, and a carrier gas into contact with a mass of said precursory catalyst at a temperature of from 350° to 600° C. and at a supply rate of said phosphorus compound of from 0.01 to 10 millimoles/hr. per 1 ml. of the mass of said precursory catalyst during when a total amount of from 0.3 to 30 millimoles, of said organic phosphorus compound per 1 ml. of the mass of said precursory catalyst passes through the mass of said precursory catalyst.
Claim 2
Independent Claim
188 words
A method for producing a catalyst usable for the preparation of maleic anhydride by catalytic oxidation of unsaturated hydrocarbon having 4 to 6 carbon atoms, comprising mixing a titanium oxide and a vanadium compound, in an atomic ratio of Ti to V of from 1 to 15, said vanadium compound being selected from the group consisting of vanadium oxides, vanadium halides, metavanadic acid, ammonium vanadate and vanadium oxychlorides, calcining said mixture at a temperature of from 630° to 1000° C. to form a precursory catalyst, and bringing a gas mixture containing an organic phosphorus compound selected from the group consisting of phosphines, trialkyl phosphates and trialkyl phosphites, and a carrier gas into contact with a mass of said precursory catalyst at a temperature of from 350° to 600° C. and at a supply rate of said phosphorus compound of from 0.01 to 10 millimoles/hr. per 1 ml. of the mass of said precursory catalyst during when a total amount of from 0.3 to 30 millimoles, of said organic phosphorus compound per 1 ml. of the mass of said precursory catalyst passes through the mass of said precursory catalyst.
Claim 3
Dependent Claim
27 words
A method as claimed in claim 1, wherein said precursory catalyst is granulated into granules each having a volume of from 0.01 to 2 cm 3 .
Claim 4
Dependent Claim
23 words
A method as claimed in claim 1, wherein said titanium oxide is either a rutile type or an anatase type of titanium dioxides.
Claim 5
Dependent Claim
27 words
A method as claimed in claim 1, wherein said carrier gas is selected from air, steam, nitrogen and mixtures of two or more of the above-mentioned gases.
Claim 6
Dependent Claim
29 words
A method as claimed in claim 1, wherein said organic phosphorus compound is contained in an amount of from 0.01 to 1% by gas volume in said gas mixture.
Claim 7
Dependent Claim
20 words
A method as claimed in claim 1, wherein said vanadium compound is either a vanadium oxide or an ammonium metavanadate.
Claim 8
Dependent Claim
24 words
A method as claimed in claim 1, wherein each of the alkyl groups in said organic phosphorus compound has 1 to 5 carbon atoms.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-05-14 | 1982-11-13 | 1983-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-14 | 1986-11-13 | 1987-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-14 | 1990-11-13 | 1991-05-15 | $7700.00 | Window Closed / Lapsed |