尿素与甘油反应制甘油碳酸酯的绿色合成工艺

Investigation on a green synthetic approach for glycerol carbonate:The reaction of glycerol with urea

以甘油和尿素为原料,探讨了低甘油含量的甘油碳酸酯环境友好的合成工艺。考察了催化剂的结构、反应条件等因素对甘油转化率的影响,结果表明在390℃煅烧3 h的硫酸锌催化效果最好。采用甘油与尿素反应后再与碳酸酯反应的偶合反应方式,所得甘油碳酸酯中甘油的含量仅为0.6%,降低了合成成本。

An environmentally friendly synthesis approach of glycerol carbonate with low glycerol residue was evaluated by using glycerol and urea as raw materials.The effects of catalyst structure and reaction condition on the conversion of glycerol were investigated.The results showed that the zinc sulfate calcined at 390 ℃ for 3 h had the highest activity.The glycerol content in product can be reduced by the combination of batch reaction of glycerol with urea and then with dimethylcarbonate,by which the glycerol content in the glycerol carbonate is lower to 0.6%,and the synthesis cost of glycerol carbonate is reduced as well.