Mg(Al)O催化环氧丙烷一步法合成碳酸二甲酯的研究

One-Step Catalytic Synthesis of Dimethyl Carbonate Using Magnesium-Aluminum Oxide

由水滑石焙烧制得镁-铝氧化物,使用镁-铝氧化物催化剂以环氧丙烷(PO)、二氧化碳和甲醇为原料一步催化合成了碳酸二甲酯(DM C)并联产碳酸丙烯酯(PC)和丙二醇(PG).实验表明,n(M g)/n(A l)=8的水滑石经773 K焙烧后得到的催化剂对一步合成具有最佳的催化性能.在反应温度433 K和压力6 M Pa下,使用镁-铝氧化物催化剂反应10 h后PO转化率达到100%,DM C选择性为20.2%.

Magnesium-aluminum oxide was obtained from the calcination of magnesium-aluminum hydrotalcite. Magnesium-aluminum oxide thus obtained was used as the catalyst for one-step synthesis of dimethyl carbonate （DMC）, propylene carbonate （PC） and propylene glycol （PG）, from the reaction of propylene oxide （PO）, carbon dioxide and methanol. Calcination temperature of 773 K and a Mg/Al molar ratio of 8 gave the best catalyst for this reaction. Under the reaction conditions of T=433 K, p=6 MPa, 10 h, the PO conversion reached 100% and DMC selectivity reached 20.20%.