碳酸二甲酯-碳酸二乙酯二元体系汽液平衡数据的测定与关联

采用双循环汽液平衡釜测定了101.33 kPa下碳酸二甲酯-碳酸二乙酯二元体系在363.3—398.9 K的汽液平衡数据。实验数据经面积积分法检验符合热力学一致性。分别采用Wilson和NRTL模型对该实验数据进行了关联,利用关联出的模型参数计算相应的汽相组成,并与实验值比较,其平均偏差小于0.004 6,表明二者符合良好,这为建立碳酸二甲酯和碳酸二乙酯的精馏分离数学模型提供了基础数据。

Measurement and correlation for vapor-liquid equilibrium of binary system for dimethyl carbonate-diethyl carbonate

Vapor-liquid equilibrium(VLE) data of binary system for dimethyl carbonate(DMC)+diethyl carbonate(DEC) were measured by double circulating vapor-liquid equilibrium caldron at 101.33 kPa and 363.3-398.9 K.The experimental results were checked by Herington method and were in full consistence with thermodynamics.The Wilson and NRTL modes were used to correlate the VLE data of the binary system to obtain the binary parameters.With the parameters,vapor compositions were calculated and compared with the corresponding experimental data.The average deviation in vapor phase was less than 0.004 6.The agreement between calculated and experimental data was satisfactory.These data can be used for building the mathematical model of separating DMC and DEC.