Compositions – Preservative agents – Anti-oxidants or chemical change inhibitants
Patent
1976-10-04
1977-12-20
Garvin, Patrick P.
Compositions
Preservative agents
Anti-oxidants or chemical change inhibitants
252437, 26034675, B01J 2714
Patent
active
040640701
ABSTRACT:
A process for producing maleic anhydride which comprises partially oxidizing a hydrocarbon feed at a temperature in the range 300.degree.-600.degree. C by contacting said feed and an oxygen-containing gas with a catalyst comprising vanadium, phosphorus and silicon oxides prepared by steps comprising coprecipitating vanadium oxide and silica or a silica precursor. Preferably an organic silicon compound, especially an alkyl orthosilicate, is used to form the silica precipitate. Preferably the organic silicon compound is added so as to coprecipitate both during the reduction of the vanadium from a +5 oxidation state to a 3.5-4.6 oxidation state and also is added or is present so as to precipitate silica or a silica precursor simultaneously with the reaction of phosphoric acid with the reduced vanadium.
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patent: 2738336 (1956-03-01), Mavity
patent: 3156706 (1964-11-01), Kerr
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patent: 3915892 (1975-10-01), Harrison
patent: 3985775 (1976-10-01), Harrison
patent: 3987063 (1976-10-01), Lemal et al.
Chevron Research Company
Garvin Patrick P.
Newell D. A.
Stoner, Jr. John
Turner W. Keith
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