酸催化二甘醇脱水环化反应研究  

Study on Dehydration Reaction of DEG over Acid Catalysts

作　　者：李肇凯[1] 

机构地区：[1]中国石化上海石油化工股份有限公司化工部,200540

出　　处：《金山油化纤》2006年第1期8-12,共5页Petrochemical Technology in Jinshan

摘　　要：以硫酸、磷钨酸、ZRP-5分子筛为催化剂,研究了二甘醇(DEG)脱水环化的反应规律。结果表明,DEG发生分子内脱水环化反应,生成1,4-二氧六环(DOX),DEG分子间脱水不仅可以生成四甘醇、六甘醇等,同时可生成三甘醇、五甘醇等一系列的多甘醇(PEG)。不仅DEG可以脱水环化生成DOX,在反应中生成的PEG也同样可以进行生成DOX的反应。对于二甘醇(DEG)脱水环化反应,硫酸是性能优良的催化剂,反应可以在较低的温度下进行,馏出产物中DOX选择性大于95％。In this paper, the main reaction and by -reaction were studied for the synthesis of 1,4 -dioxane by cyclodehydration of DEG over H2SO4 ,H3PW12040and ZRP- 5 catalysts. Result showed that triethylene glycol,pentaethylene glycol etc were also synthesized by intermolecular dehydration of DEG besides tetraethylene glycol, hexaethylene glycol etc. It suggested that DOX could also be synthesized from PEG produced herefrom with a relatively low selectivity. Sulfuric acid is a good catalyst in this reaction with a low reaction temperature and high selectivity over 95% for DOX.

关 键 词：二甘醇 1 4-二氧六环 多甘醇 酸催化剂 脱水反应 

分 类 号：TQ655[化学工程—精细化工] TQ330.63