异丁烯二步法制备甲基丙烯酸甲酯的研究

制备了用于异丁烯选择性氧化制备甲基丙烯醛（MAL）和MAL氧化酯化制备甲基丙烯酸甲酯（MMA）的复合氧化物和负载贵金属催化剂，开发了异丁烯二步法制备MMA新工艺。在异丁烯氧化制备MAL反应过程中，反应温度为380 ℃，反应压力为0.03 MPa，异丁烯平均转化率达到93.7%，MAL平均选择性达到92.3%。在MAL氧化酯化制备MMA反应过程中，反应温度为90 ℃，反应压力为0.27 MPa，对于间歇反应，MAL平均转化率为93.35%，MMA平均选择性为83.50%；对于双程连续反应，MAL平均转化率为93.24%，MMA平均选择性为80.06%。

A STUDY OF TWO-STEP SYNTHFSIS OF METHYL METHACRYLATE FROM ISOBUTENE

Compound oxide catalyst for isobutene selective oxidation to methacrolein(MAL) and supported noble metal catalyst for MAL oxidative esterification to methyl methacrylate(MMA) were prepared,and a new process for two-step synthesis of MMA from isobutene was developed.For isobutene to MAL process,under a reaction temperature of 380 ℃ and a reaction pressure of 0.03 MPa,the average conversion of isobutene and the average selectivity of MAL reached 93.7% and 92.3%,respectively.For MAL to MMA process,under a reaction temperature of 90 ℃ and a reaction pressure of 0.27 MPa,in batch reaction mode,the MAL average conversion and the average selectivity of MMA was 93.35% and 83.50%,respectively;under two-stage continuous operation mode,the MAL average conversion and the average selectivity of MMA was 93.24% and 80.06%,respectively.