类水滑石催化剂催化合成碳酸二丙酯

Synthesis of dipropyl carbonate from dimethyl carbonate and propanol catalyzed by hydrotalcite-like catalyst

采用共沉淀法,在500℃烘干焙烧制备了类水滑石催化剂,采用X射线衍射(XRD)、红外光谱(FT-IR)、BET分析对催化剂进行了表征。将类水滑石催化剂应用于碳酸二甲酯(DMC)与正丙醇酯交换合成碳酸二丙酯(DPC)。研究结果表明:镁铝摩尔比为2∶1,在500℃焙烧后,类水滑石对反应有较高的催化活性;当丙醇∶DMC=3∶1(摩尔比)、催化剂用量为反应物总质量的1%、反应温度为90℃、反应时间为5 h时,DPC的收率为46.87%。

The catalytic behavior of hydrotalcite-like catalysts for the synthesis of dipropyl carbonates（DPC） by the transesterification of dimethyl carbonate（DMC） with propanol was investigated.The catalysts were characterized by X-ray diffraction（XRD）,FT-IR spectroscopy,and nitrogen adsorption–desorption isotherms（BET）.Effects of the molar ratio of Mg to Al,calcinatory temperature,catalyst dosage and reaction conditions on the catalytic activity were investigated in detail and the optimized reaction condition was found.With the conditions of the molar ratio of Mg to Al 2∶1,the calcinatory temperature 500 ℃,the reaction temperature 90 ℃,the reaction time 5 h,molar ratio of DMC to propanol 1∶3 and catalyst content 1%,the yield of DPC 46.87% was achieved.