碳酸二甲酯与乙醇酯交换反应体系的热力学分析  

Thermodynamic analysis of transesterification between dimethyl carbonate and ethanol

作　　者：王丽苹[1] 

机构地区：[1]曲靖师范学院化学化工学院,曲靖655011

出　　处：《天然气化工—C1化学与化工》2012年第5期23-26,共4页Natural Gas Chemical Industry

摘　　要：采用Benson和Joback基团贡献法对碳酸二甲酯(DMC)与乙醇酯交换合成碳酸二乙酯(DEC)反应体系进行了热力学分析,计算了反应的焓变、熵变、吉布斯自由能变及平衡常数。结果表明,该酯交换反应为放热反应,升高温度不利于DEC的合成。与碳酸甲乙酯(EMC)歧化反应的平衡常数相比,EMC与乙醇酯交换反应的平衡常数较大,反应更易进行。The enthalpy, entropy and Gibbs free energy changes as well as the equilibrium constants of the reactions for the synthesis of diethyl carbonate （DEC） by transesterification of dimethyl carbonate （DMC） with ethanol were calculated by Benson and Jobaek group contribution methods. The results showed that the transesterification reaction is exothermic, so the higher temperature is unfavorable for DEC synthesis. The equilibrium constant of the transesterification reaction between ethyl methyl carbonate （EMC） and ethanol is larger than that of EMC dismutation reaction.

关 键 词：碳酸二甲酯 乙醇 酯交换 碳酸二乙酯 热力学 

分 类 号：TQ013.1[化学工程]