This is intended to reduce the formation of dimers during the production of compounds lower by hydrolysis of a corresponding carboxylic ester

摘要

Brief description of the drawings for the production of compounds polyhydroxyl 2 has 6c from their carboxylates lower. / p & & p & the initial mixture containing the carboxylate inferior, is hydrolyzed with water at 6 in the presence of a catalyst, which gives, at 18, a product, containing the composed polyhydroxyl, the carboxylic acid, water and of the fragments of catalyst, and which is distilled at 20 in order to give a first product of the head 22 containing the water and a first product of the shank 35 containing the composed polyhydroxyl and the carboxylic acid; this product is distilled, 35, 36, to give a second product of the head 38 containing the carboxylic acid, and a second end 46 containing the product comprises polyhydroxyl and which is treated, 80, in order to extract the composed polyhydroxyl. / p & & p & application: obtaining ethylene - or propylene - glycol practically free of products in - dimers.