KF/MgO催化碳酸二甲酯与月桂醇酯交换合成碳酸二月桂酯

Transesterification of Dimethyl Carbonate with Dodecanol to Didodecyl Carbonate over KF/MgO Catalyst

研究了KF/MgO催化剂对碳酸二甲酯(DMC)与月桂醇酯交换反应制备碳酸二月桂酯(DDC)的催化性能.考察了催化剂KF负载量及焙烧温度对反应的影响,并采用X射线衍射、傅里叶变换红外光谱、扫描电镜和N2吸附-脱附等对催化剂进行了表征.结果表明,催化剂KF/MgO在空气中较高温度焙烧后生成新相K2MgF4和K2CO3,它们为催化剂的主要活性组分.催化性能测试结果表明,该催化剂具有良好的催化活性,KF的最佳负载量为30%,催化剂的最佳焙烧温度为873K.还考察了反应条件对KF/MgO催化剂性能的影响.当在反应物月桂醇:DMC摩尔比=4,催化剂用量为反应物总质量的0.75%,反应时间为4h的条件下,反应性能最佳,DMC转化率和DDC收率分别为86.7%和86.2%.

The catalytic activity of KF/MgO for the synthesis of didodecyl carbonate （DDC） by transesterification of dimethyl carbonate （DMC） with dodecanol （DoOH） was studied. The effects of KF loading and calcination temperature were investigated. The catalysts were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, and N2 adsorption-desorption. The results indicated that new phases K2MgF4 and K2CO3 were formed when KF/MgO was calcined in air at high temperature. K2MgF4 and K2CO3 were the main catalytic sites in this reaction. KF/MgO was an effective catalyst in this transesterification reaction and the optimized KF loading and calcination temperature were 30% and 873 K, respectively. The optimized reaction conditions were as follows： n（DoOH）：n（DMC） = 4, catalyst amount 0.75%, reaction time 4 h. Under these conditions, the conversion of DMC and the yield of DDC were 86.7% and 86.2%, respectively.