Preparation of maleic anhydride

Details Preparation of maleic anhydride Preparation of maleic anhydride

1981-04-29

1982-09-21

Jiles, Henry R.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D30760

Patent

active

043506399

ABSTRACT:
The present invention provides improved oxidation catalysts containing mixed oxides of vanadium and phosphorus and the method for the preparation thereof, which catalysts are particularly effective in the oxidation of n-butane, n-butenes, 1,3-butadiene or a mixture thereof with molecular oxygen or an oxygen-containing gas in the vapor phase to produce excellent yields of maleic anhydride with very good selectivity. At least one vanadium compound, a substantial portion of which is in the pentavalent state, and at least one phosphorus-containing compound is added to an organic liquid medium capable of reducing at least a portion of the vanadium to a +4 valence state, to form a reaction mixture. Partial reduction of the vanadium is effected in the presence of the phosphorus-containing compound and a highly ordered and uniform mixed vanadium phosphorus oxide-containing catalyst precursor is formed.

REFERENCES:
patent: 3985775 (1976-10-01), Harrison
patent: 4016105 (1977-04-01), Kerr
patent: 4043943 (1977-08-01), Schneider
patent: 4132670 (1979-01-01), Katsumoto et al.
patent: 4149992 (1979-04-01), Mount et al.

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