改性分子筛催化乳酸甲酯的脱水反应  

Dehydration of methyl lactate catalyzed by modified zeolites

作　　者：王桂兰[1] 施海峰[1] 胡耀池[2] 汪洋[1] 黄和[1] 

机构地区：[1]南京工业大学制药与生命科学学院,江苏南京210009 [2]湖南科技大学化学化工学院,湖南湘潭411201

出　　处：《化学工程与装备》2007年第1期4-8,共5页Chemical Engineering & Equipment

基　　金：中国石油化工股份有限公司科技开发项目(205085)资助

摘　　要：通过生物基路线制备丙烯酸及酯具有潜在的经济效益,同时对化石资源的绿色替代具有重要意义。考察了X.Y,ZSM-5等沸石分子筛经过钾、钙、钴等金属离子交换改性后,在乳酸甲酯脱水制备生物基丙烯酸甲酯过程中的催化性能。试验结果表明K离子改性Y沸石分子筛对产物的选择性高,而ZSM-5类具有较高的转化率,但是选择性低。分析结果说明:Y分于筛催化剂的高选择性与其特有的骨架结构相关。沸石分子筛催化剂需要通过金属离子的交换才能调整到适当的酸碱性实现最佳催化的效果。在上述结论的基础上,以钾离子改性的NaY分子筛为催化剂,对反应温度,反应空速等反应条件进行了优化,得到了较高的丙烯酸甲酯得率。Acrylates,important organic intermediates,were needed in increasingly huge amounts.However,the pressing supply situation of petroleum challenged the conventional petrobased process of acrylate production and made the biobased process potentially feasible in economy. This paper investigated the catalytic performances of zeolites X,Y and ZSM-5 after ion exchange treatment in the dehydration of methyl lactate to methyl acrylate.The ion exchanged Y had much higher selectivity compared to ion exchanged ZSM-5,though the modified ZSM-5 had higher activity.The relatively high selectivity of zeolite Y might have correlation with its big-pore structure.Zeolite NaY was exchanged with K+ to tune the acidity of NaY.This modified zeolite showed best performance among other modified zeolite catalysts.The reaction temperature,LHSV and oth- er conditions were optimized for the potassium exchanged zeolite NaY.and the yield of methyl acrylate was elevated.

关 键 词：丙烯酸甲酯 乳酸甲酯 分子筛 离子交换 

分 类 号：O643.32[理学—物理化学]