Method for producing heteropoly acid compound, heteropoly acid compound and method for producing methacrylic acid

摘要

Problem to be solved: to provide a method of producing a heteropoly acid compound capable of producing a heteropoly acid compound capable of obtaining both a conversion ratio and a selectivity in the case of using a catalyst in a gas phase catalytic oxidation reaction and capable of obtaining a product at a higher yield.Manufacturing method of heteropoly acid compound containing phosphorus, molybdenum and copper including the following process (1) and the following process (2):[step (1)] an aqueous mixture containing nitric acid and phosphorus compound (a) and an aqueous mixture containing a molybdenum compound (b) to obtain an aqueous slurry (c) by mixing the molar of 12 mol of molybdenum into 1.2 to 2.0 mole;[step (2)] an aqueous slurry (E) is obtained by mixing the aqueous slurry (c) and an aqueous mixture (d) containing a copper compound to the molar of molybdenum from 0.01 to 0.20 mole.No selection