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US 4,400,522 AGranted
Preparation of maleic anhydride
AssigneeThe Standard Oil Company
InventorsMichael F. Lemanski, Gregory G. Spitnale, Ernest C. Milberger
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AssigneeThe Standard Oil Company
InventorsMichael F. Lemanski, Gregory G. Spitnale, Ernest C. Milberger
Estimating the term…
The present invention provides a method for the preparation of oxidation catalysts containing mixed oxides of vanadium and phosphorus, 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 high yields of maleic anhydride with good selectivity. Vanadium phosphorus mixed oxide catalyst precursors prepared in solution in organic media are extracted from the organic media with water, with subsequent drying down to recover a precursor solid, or impregnation of a support with the aqueous solution.
A process for the production of maleic anhydride by the oxidation of n-butane, n-butene, 1,3 butadiene or a mixture thereof with molecular oxygen or oxygen-containing gas in the vapor phase at a reaction temperature of 250.degree. C.-600.degree. C. in the presence of a catalyst containing the mixed oxides of vanadium and phosphorus, wherein the average valence state of the vanadium is about +3.5 to about +4.6 and wherein said catalyst is prepared in an organic liquid medium, including the step of extracting the solubilized catalyst precursor from the organic liquid with water to form a solubilized catalyst precursor-containing aqueous solution.
A process for the production of maleic anhydride by the oxidation of n-butane, n-butene, 1,3 butadiene or a mixture thereof with molecular oxygen or oxygen-containing gas in the vapor phase at a reaction temperature of 250.degree. C.-600.degree. C. in the presence of a catalyst containing the mixed oxides of vanadium and phosphorus, wherein said catalyst is prepared by
Dependencies are inferred from the claim text.