化工学报2019，Vol.70Issue(9)：3228-3237,10.DOI:10.11949/0438-1157.20181314
CO2-C2H6共沸物分离的立方型状态方程选取
Selection of cubic equations of state for separation of CO2-C2H6 azeotrope
摘要
Abstract
Accurate selection of vapor-liquid equilibrium thermodynamic model is essential to the design and operation of CO2-C2H6 azeotrope separation process. On the basis of collected experimental data, the reliabilities of four types of cubic equations of state including vdW, RK, SRK and PR combined with vdW, Margles and CVD mixing rules for predicting vapor-liquid equilibrium properties of CO2 pure substance, CO2-C2H6 azeotrope and n-C5H12-CO2-C2H6 ternary system are evaluated according to the principle of vapor-liquid fugacity equilibrium. In addition, average absolute deviation is adopted to select cubic state equations. The results show that the SRK equation of state calculates the vapor-liquid equilibrium property of CO2 pure material with the highest precision. The PR equation of state combined with Margles mixing rule can accurately calculate the vapor-liquid equilibrium characteristics of CO2-C2H6 azeotrope system. However, for n-C5H12-CO2-C2H6 ternary system, the calculating accuracy of SRK combined with Margles mixing rule is obviously better than that of vdW, RK and PR. Furthermore, binary interaction parameters have obvious effects on the calculating accuracy of cubic equations of state for the mixture system. In order to improve the calculation accuracy, the binary interaction parameter is calibrated for all of the studied EOSs regarding CO2-C2H6 azeotropic system and n-C5H12-CO2-C2H6 ternary system.关键词
CO2-C2H6共沸物/立方型状态方程/逸度平衡/混合规则/二元交互作用参数/平均绝对误差Key words
CO2-C2H6 azeotrope/cubic equation of state/fugacity equilibrium/mixing rule/binary interaction parameters/average absolute deviation分类
能源科技引用本文复制引用
王海琴,范明龙,张足斌..CO2-C2H6共沸物分离的立方型状态方程选取[J].化工学报,2019,70(9):3228-3237,10.基金项目
国家自然科学基金项目(51306210) （51306210）
