【摘要】 开发了迅速测定超临界流体－聚合物混合物系中的无限稀释气液平衡比 率（以下简称气液平衡比率）的系统．该系统由气液分配色谱与石英压电法两 套实验装置构成．应用该系统在温度３１３．２、３３３．２Ｋ，压力８ ＭＰａ以下的条件 下测定了苯与甲苯在二氧化碳－聚醋酸乙烯酯（ＰＶＡｃ）混合物系中的气液平 衡比率．两温度下的实验值都呈现极小值，并在压力８ ＭＰａ附近有大小交替 趋势．使用Ｓａｎｃｈｅｚ－Ｌａｃｏｍｂｅ状态方程对气液平衡比进行了推算，推算中使 用的各二元混合物系的相互作用参数是通过关联各物系的气液平衡实验值 获得的.推算值与实验值良好一致．更多还原

【Abstract】 A new system was developed for rapidly measuring vapor-liquid equilibrium ratios of solutes at infinite dilution state (K-value) in a supercritical fluid + polymer system by combining the vapor-liquid partition chromatography with a piezo-electric-quartz sorption method. The K-values for benzene and toluene in the CO2 + polyvinyl acetate system were measured by using the above system at 313. 2 and 333. 2 K and up to 8 MPa. It was found that both isotherms for the K-values exhibited a minimum and intersect at a pressure -range around 8 MPa. Furthermore, the K-values were predicted by Sanchez and Lacombe’ s EQS with binary parameters evaluated by the correlation of phase-equilibrium data for binary systems. Agreement between measured and predicted values is good.更多还原