Cs/SiO_(2)催化合成MMA工艺及宏观动力学研究  

Synthesis process for methyl methacrylate over Cs/SiO_(2)and its macro-kinetics

作　　者：贾鑫 张伟 王兴永 张胜红[1,2] 傅送保 姚志龙 JIA Xin;ZHANG Wei;WANG Xing-yong;ZHANG Sheng-hong;FU Song-bao;YAO Zhi-long(College of New Materials and Chemical Engineering,Beijing Institute of Petrochemical Technology,Beijing 102617,China;Beijing Key Laboratory of Enze Biomass Fine Chemicals,Beijing 102617,China;CNOOC Institute of Chemicals&Advanced Materials Sciences(Beijing)Co.,Ltd.,Beijing 102209,China)

机构地区：[1]北京石油化工学院新材料与化工学院,北京102617 [2]恩泽生物质精细化工北京市重点实验室,北京102617 [3]中海油化工与新材料科学研究院(北京)有限公司,北京102209

出　　处：《现代化工》2024年第1期210-215,220,共7页Modern Chemical Industry

摘　　要：采用浸渍法制备了不同Cs质量分数的Cs/SiO_(2)催化剂,并利用XRD､氮气物理吸附､CO_(2)-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/SiO_(2)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/SiO_(2)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。Cs/SiO_(2)catalysts with different Cs contents are prepared via the impregnation method,and characterized by means of XRD,nitrogen physical adsorption,CO_(2)-TPD and NH3-TPD.The reaction conditions for the Cs/SiO_(2)-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/SiO_(2)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 

分 类 号：TQ426.94[化学工程]