Process for the preparation of polyglycidyl ethers of polyhydric phenols and polyglycidyl ethers so prepared
申请人:SHELL INTERNATIONALE RESEARCH
MAATSCHAPPIJ B.V.
公开号:EP0018040A1
公开(公告)日:1980-10-29
Liquid polyglycidyl ethers of polyhydric phenols are prepared by (A) reacting the polyhydric phenol and an excess of epichlorohydrin in the presence of a condensation catalyst with formation of chlorohydrin ethers by addition reactions and glycidyl ethers and dichlorohydrin by transepoxidation reactions, until at least 95% of the phenolic groups have reacted, (B) distilling off epichlorohydrin and dichlorohydrin, with addition of supplementary dichlorohydrin, at temperatures at which glycidyl ethers are reconverted into chlorohydrin ethers by reaction with dichlorohydrin, (C) dissolving the residue after removal of volatile components in organic solvent and dehydrohalogenating with aqueous alkali metal hydroxide with separation of the aqueous alkali chloride solution, and isolating the polyglycidyl ether.
多氢酚液体聚缩水甘油醚的制备方法是:(A)在缩合催化剂存在下,使多氢酚和过量环氧氯丙烷反应,通过加成反应生成氯醇醚,通过瞬时氧化反应生成缩水甘油醚和二氯丙醇,直到至少 95%的酚基团发生反应;(B)蒸馏掉环氧氯丙烷和二氯丙醇,同时加入补充的二氯丙醇,在此温度下,缩水甘油醚通过与二氯丙醇反应重新转化为氯醇醚;(C)溶解残留物、(C) 将除去挥发性成分后的残留物溶解在有机溶剂中,并用碱金属氢氧化物水溶液脱氢,分离出氯化碱水溶液,分离出聚缩水甘油醚。