PROCESS FOR PREPARING METHACRYLIC ACID

摘要

Methacrylic acid is prepared by reacting methacrolein with molecular oxygen in the vapor phase at a temperature of from 230 DEG C. to 450 DEG C. in the presence of a catalyst having the formula Mo12P alpha 'X beta 'Y gamma 'O delta ' wherein X is at least one member of the group consisting of Cs and Tl:Y is at least one member of the group consisting of Cs and Tl; Y is at least one member of the group consisting of V, Zr, Nb, Ni, Ta and Fe; alpha '=0.1-3; beta '=0.2-9; gamma '=0.1-7; delta '=36-100.