Cs/SiO2催化合成MMA工艺及宏观动力学研究
Synthesis process for methyl methacrylate over Cs/SiO2 and its macro-kinetics
贾鑫 1张伟 1王兴永 2张胜红 1傅送保 2姚志龙1
作者信息
- 1. 北京石油化工学院新材料与化工学院,北京 102617;恩泽生物质精细化工北京市重点实验室,北京 102617
- 2. 中海油化工与新材料科学研究院(北京)有限公司,北京 102209
- 折叠
摘要
采用浸渍法制备了不同Cs质量分数的Cs/SiO2 催化剂,并利用XRD、氮气物理吸附、CO2-TPD和NH3-TPD等技术对其进行表征.在固定床反应器中,优化了Cs/SiO2 催化丙酸甲酯与甲醛缩合制备甲基丙烯酸甲酯(MMA)的反应条件,并初步进行了动力学分析.结果表明,Cs质量分数为 10%的Cs/SiO2 催化剂性能最优,在反应温度为 370℃、反应空速为 1.2 h-1、酯醛摩尔比为1∶1的优化条件下,丙酸甲酯的转化率为 46.3%,MMA的选择性接近100%.动力学分析显示丙酸甲酯与甲醛缩合制备MMA的表观活化能为39.1 kJ/mol,非常接近理论值.
Abstract
Cs/SiO2 catalysts with different Cs contents are prepared via the impregnation method,and characterized by means of XRD,nitrogen physical adsorption,CO2-TPD and NH3-TPD.The reaction conditions for the Cs/SiO2-catalyzed condensation between methyl propionate and formaldehyde to methyl methacrylate(MMA)are optimized in a fixed-bed reactor,and the reaction kinetics is also briefly explored.It is proved that the Cs/SiO2 catalyst with a Cs content of 10 wt%is the optimal for the condensation,over which the conversion of methyl propionate reaches 46.3%and the selectivity of MMA reaches nearly 100%under the optimized conditions as follows:the reaction temperature is 370℃,n(MP)/n(HCHO)= 1/1,and WHSV=1.2 h-1.It is shown from additional kinetic analysis that the apparent activation energy for the reaction is 39.1 kJ·mol-1,close to the theoretical value.
关键词
甲基丙烯酸甲酯/羟醛缩合/丙酸甲酯/宏观动力学Key words
methyl methacrylate/aldol condensation/methyl propionate/macro-kinetics引用本文复制引用
出版年
2024
NETL
NSTL
万方数据