High Pressure Vapor-Liquid Equilibrium of Supercritical Carbon Dioxide + n-Hexane System
Vapor-liquid equilibrium data of supercritical carbon dioxide + n-hexane system were measured at 313.15 K,333.15 K,353.15 K,and 373.15 K and their molar volumes and densities were measured both in the subcritical and supercritical regions ranging from 2.15 to 12.63 MPa using a variable-volume autoclave.The thermodynamic properties including mole fractions,densities,and molar volumes of the system were calculated with an equation of state by Heilig and Franck,in which a repulsion term and a square-well potential attraction term for intermolecular interaction was used.The pairwise combination rule was used to calculate the square-well molecular interaction potential and three adjustable parameters (ω,kε,kσ) were obtained.The Heilig-Franck equation of state is found to have good correlation with binary vapor-liquid equilibrium data of the carbon dioxide + n-hexane system.
作 者： YU Jinglin TIAN Yiling ZHU Rongjiao LIU Zhihua 作者单位： School of Science,Tianjin University,Tianjin 300072,China 刊 名： 天津大学学报（英文版） EI 英文刊名： TRANSACTIONS OF TIANJIN UNIVERSITY 年，卷(期)： 2006 12(6) 分类号： O6 关键词： carbon dioxide n-hexane molar fraction density molar volume