CATALYST FOR PRODUCTION OF METHACRYLIC ACID AND PRODUCTION OF METHACRYLIC ACID

摘要

PROBLEM TO BE SOLVED: To oxidize methacrolein by vapor phase catalytic oxidation with molecular oxygen and to produce methacrylic acid in a high yield by using a catalyst produced while specifying the amount of ammonium radicals in one solution in a specified mixed solution and the amount of ammonium radicals in the mixed solution. SOLUTION: The catalyst used in the production of methacrylic acid by the vapor phase catalytic oxidation of methacrolein with molecular oxygen has a composition of the formula PaMobVcCudXeYfZgOh and is produced by mixing a solution (A) containing at least molybdenum, phosphorus and vanadium with a solution (B) containing an ammonia compound and further mixing the resulting mixed solution (AB) with a solution (C) containing the element Z. The amount of ammonium radicals in the solution A is <=1.5 mol based 12 mol molybdenum atoms in the solution A and the amount of ammonium radicals in the solution AB is 6-17 mols based 12 mol molybdenum atoms in the solution AB.