Patent ID: 6194588
Filing Date: 2001-02-27
Classification: C07C

Abstract:
A method for the production of maleic anhydride by the catalytic gas phase oxidation of a raw material gas containing an aliphatic hydrocarbon of not less than 4 carbon atoms and molecular oxygen with a vanadium-phosphorus oxide catalyst, characterized by said raw material gas allowing presence therein of nitrogen and an inert gas possessing a thermal conductivity of not less than 800 (10.sup.-4 Wm.sup.-1 K.sup.-1) at 700 K wherein the total concentration of said nitrogen gas and said inert gas in said raw material gas is in the range of 60-94.5% by volume and wherein the ratio of nitrogen gas to said inert gas is in the range of 0.05/1-1/1.