Acrolein and acetic anhydride prodn - by catalytic cleavage of diacetoxypropene

摘要

Cleavage of diacetoxypropene is effected at 50-300 degrees C in the presence of acid catalysts of catalysts contg. halides of Gp. 2-8 metals. A suitable catalyst is ZnCl2 supported on silica. In this process, chemically linked acetic acid in the diacetoxypropene is recovered as acetic anhydride. Acrolein is obtained in highly pure anhydrous form. The diacetoxypropene may be obtained by reacting first propylene, oxygen and acetic acid in the presence of noble metal catalysts to obtain allyl acetate which is then reacted with O2 and acetic acid in the presence of these noble metal catalysts.