METHOD OF PURIFYING GLYOXYLIC ESTERS AND DISTILLATION EQUIPMENT FOR PURIFYING GLYOXYLIC ESTERS

摘要

A method for purifying glyoxylates includes (1) a coarse distillation process in which a crude glyoxylate in which water coexists is, in a film form, continuously subjected to coarse distillation, and (2) an azeotropic dehydration process in which the crude glyoxylate purified through the coarse distillation process is subjected to azeotropic dehydration in the presence of an azeotropic agent such as propyl acetate. By this method, high-purity glyoxylates can be efficiently and easily obtained at lower costs. <IMAGE>