Patent ID: 6794478
Filing Date: 2004-09-21
Classification: C08G

Abstract:
A process for preparing an epoxy resin by reacting a polyhydric phenol compound with epihalohydrin in a water-soluble organic solvent in the presence of an alkali reactive catalyst, which comprises the steps of:(1) continuously distilling a distilled component from a crude reaction product obtained by the reaction to recover a first recovered fraction containing the water-soluble organic solvent, an unreacted epihalohydrin, and a by-product glycidol in an amount of 0.01 parts by weight or less based on 1 part by weight of the unreacted epihalohydrin; (2) continuously distilling a distilled component to recover a second recovered fraction containing the by-product glycidol, the unreacted epihalohydrin, and the water-soluble organic solvent in an amount of 0.1 parts by weight or less based on 1 part by weight of the unreacted epihalohydrin; (3) recovering the epihalohydrin by washing the second recovered fraction with water to remove the water-soluble organic solvent and the by-product glycidol from the second recovered fraction; and (4) reusing the first recovered fraction and the recovered epihalohydrin as a raw material of the reaction.