PRODUCTION OF UNSATURATED CARBOXYLIC ACID

摘要

PROBLEM TO BE SOLVED: To obtain the objective unsaturated carboxylic acid such as acrylic acid and methacrylic acid in increased space-time yield without lowering the selectivity of the objective compound by using a saturated hydrocarbon such as propane and isobutane as a raw material. SOLUTION: An unsaturated carboxylic acid is produced by the vapor-phase catalytic oxidation of a 3-8C saturated hydrocarbon in the presence of molecular oxygen and a catalyst. The catalytic reaction is carried out under a reaction pressure of >=152 Kpa while keeping the contact time to <=10 sec.