环氧丙烷、二氧化碳和甲醇催化合成碳酸二甲酯  

Direct Synthesis of Dimethyl Carbonate from Propylene Oxide, Carbon Dioxide and Methanol over Solid Catalysts

作　　者：王新[1] 李渊[1] 赵新强[1] 王延吉[1] 

机构地区：[1]河北工业大学化工学院绿色化工研究所,天津300130

出　　处：《化学反应工程与工艺》2004年第1期15-19,共5页Chemical Reaction Engineering and Technology

基　　金：天津市自然科学基金资助项目(033603311)。

摘　　要：　在KI/γ-Al2O3催化剂基础上,制备了负载型固体碱催化剂并对其催化环氧丙烷(PO),CO2和甲醇直接合成碳酸二甲酯(DMC)反应的活性进行了评价,发现K2O/4A分子筛的活性最好,碳酸二甲酯的收率达18.4%,高于现有文献值。实验表明,产物DMC是由PO和CO2生成的碳酸丙烯酯(PC)与甲醇进行酯交换所生成的,甲醇对PO和CO2合成PC反应具有助催化作用。Catalytic activity of KI/γ-Al_2O_3, KI-Ti(OH)_4/γ-Al_2O_3 and some solid alkali for direct synthesis of dimethyl carbonate (DMC) from propylene oxide, carbon dioxide and methanol has been evaluated. Among the above solid catalysts, the activity of KI-Ti(OH)_4/γ-Al_2O_3 was better than that of KI/γ-Al_2O_3. And K_2O/4A molecular sieve showed the highest activity; yield of DMC reached 18.4%, which is higher than that in the literatures so for. In addition, the investigation to reaction mechanism illustrated that DMC is formed from the esterification of methanol and propylene carbonate (PC) resulted from PO and carbon dioxide. Furthermore, methanol plays role of a promoter for the synthesis of PC from PO and carbon dioxide.

关 键 词：环氧丙烷 二氧化碳 甲醇 催化合成工艺 碳酸二甲酯 催化剂 DMC 碳酸丙烯醇 

分 类 号：TQ225.245[化学工程—有机化工]