KF/γ-Al2O3催化甘油酯交换合成碳酸甘油酯

Synthesis of glycerol carbonate by transesterification of glycerol with dimethyl carbonate over KF/γ- Al2O3 catalyst

摘要:

采用等体积浸渍法制备了一系列氧化铝负载碱金属氟化物固体碱催化剂，用于甘油（丙三醇）与碳酸二甲酯酯反应合成碳酸甘油酯，其中KF/γ-Al2O3催化剂能够更好地促进碳酸甘油酯的生成。进一步考察了KF/γ-Al2O3催化剂的制备条件、反应条件对甘油与碳酸二甲酯酯交换反应的影响，KF负载量、催化剂焙烧温度、反应条件等对甘油的转化和碳酸甘油酯的选择性有显著影响。当KF的负载量为15wt.%，400℃焙烧5h，n(碳酸二甲酯):n(甘油)=3:1，80℃反应1.5h，甘油的转化率达到96.1%，碳酸甘油酯选择性和收率分别达到98.1%和94.3%。

Abstract:

Series of Alumina supported alkali metal fluoride solid base catalysts were prepared by an impregnation method and applied to the synthesis of glycerol carbonate (GC) via transesterification of glycerol with dimethyl carbonate(DMC). Among these catalysts, KF/γ-Al2O3 could promote the transformation of glycerol into GC more efficiently than other catalysts. The effects of preparation conditions of KF/γ-Al2O3 and reaction conditions on transesterification of glycerol with DMC were investigated. The results proved that the loading amount of KF over KF/γ-Al2O3, calcination temperature and time of catalysts and reaction conditions had significant impacts on the conversion of glycerol and the selectivity of GC. With the molar ratio of DMC to glycerol 3:1, reacted at 80℃ for 1.5h, the conversion of glycerol, selectivity and yield of GC attained 96.1%, 98.1% and 94.3%, respectively, over KF/γ-Al2O3 catalyst with 15wt.% KF loading amount and calcined at 400℃ for 5h.