Cs/SiO2催化丙酸甲酯合成甲基丙烯酸甲酯工艺  

SYNTHESIS PROCESS OF METHYL METHACRYLATE FROM METHYL PROPIONATE OVER Cs/SiO2

作　　者：杨小林[1] 冯裕发 周鹏鹏[1] Yang Xiaolin;Feng Yufa;Zhou Pengpeng(College of Chemical & Materials Engineering, Changzhou Vocational Institute of Engineering, Changzhou 213164, Jiangsu, China)

机构地区：[1]常州工程职业技术学院化学与材料工程学院,江苏常州213164

出　　处：《精细石油化工》2020年第2期5-10,共6页Speciality Petrochemicals

基　　金：江苏省教育厅2015年度江苏省品牌专业建设一期项目(PPZY2015B78);常州市科技支撑计划(CE20180010)。

摘　　要：制备了系列Cs负载于SiO2的碱性催化剂,研究了其催化丙酸甲酯与三聚甲醛反应合成甲基丙烯酸甲酯工艺。考察了反应温度、Cs负载量、原料摩尔比及催化剂焙烧温度等条件对反应的影响,结果表明:以20%的丙酸甲酯的甲醇溶液为原料,15%Cs浸渍的SiO2为催化剂,焙烧温度为600℃,反应温度为320℃,n(MP)/n(HCHO)为1∶1,液时空速为1.5 h^-1,丙酸甲酯的转化率达42.1%,甲基丙烯酸甲酯的选择性为91.4%。CO2-TPD的分析结果表明,催化剂表面的弱碱性位有利于目标产物甲基丙烯酸甲酯选择性的提高。A series of SiO2 supported Cs catalysts have been prepared.Using these catalysts,the catalytic process for the synthesis of methyl methacrylate from methyl propionate(MP)and trioxymethylene has been studied.Under the optimized reaction conditions:20%methyl propionate in methanol solution as raw material,15%Cs impregnated SiO2 calcined under 600℃as the catalyst,reaction temperature 320℃,the ratio of n(MP)/n(HCHO)1∶1,liquid hourly space velocity 1.5 h^-1,the conversion of methyl propionate reached 42.1%,and the selectivity of methyl methacrylate was 91.4%.The CO2-TPD analysis indicated that the surface weak basic site is beneficial to the increasement of the target product methyl methacrylate.

关 键 词：甲基丙烯酸甲酯 Cs/SiO2 羟醛缩合 丙酸甲酯 焙烧 

分 类 号：TQ426.81[化学工程]