CaO催化制备碳酸甘油酯

Synthesis of Glycerol Carbonate Catalyzed by CaO

摘要:

以甘油和碳酸二甲酯为原料，CaO为催化剂合成了碳酸甘油酯。通过正交实验及单因素实验考察了反应温度、回流温度、碳酸二甲酯用量、催化剂用量、反应时间对反应的影响，确定了优化工艺条件：反应温度75 ℃，回流温度60 ℃，碳酸二甲酯与甘油摩尔比为2.5:1，催化剂质量分数0.8%，反应时间2 h；甘油转化率及碳酸甘油酯收率分别可达97.89%和96.78%。CaO的存储稳定性及重复利用性实验结果表明，CaO虽具有较佳的存储稳定性，但其重复利用性较差，使用一次后活性即显著降低。

Abstract:

Glycerol carbonate was synthesized by glycerol and dimethyl carbonate with CaO as catalyst. The effects of reaction temperature, reflux temperature, reactant molar ratio, catalyst dosage, and time on the reaction were studied by orthogonal experiment and single-factor test. The optimal reaction conditions were obtained as follows: reaction temperature 75 ℃, reflux temperature 60 ℃, n(dimethyl carbonate): n(glycerin) = 2.5:1, catalyst dosage = 0.8%, reaction time = 2 h；the conversion of glycerol and the yield of glycerol carbonate reached 97.89% and 96.78%, respectively. Finally, The storage stability and reusability of CaO were also evaluated, indicating that although CaO was of relatively good storage stability, its reusability was so poor that it lost its activity after the first cycle of use.