置换法测定汽液平衡

Equal Volume Exchange Method for VLE Determination

本文提出一种不分析组成测定汽液平衡的新方法.它的基本原理建立在流动体系稳态物料守恒关系的基础上,通过配制溶液与汽液平衡测定仪的平衡汽相(或液相)浓度区溶液的等量置换,测定已知浓度所对应的露点(或泡点)温度.本工作导出了该方法的置换量方程,探讨了置换法的实现问题,给出适于该方法的仪器,并测定了一些体系的稀溶液泡点、端值和露点线;数据与平行方法的测定结果比较,一致性良好,由此初步验证了方法的可行性.

A new method for vapor liquid equlibrium determination without analytical determination of concentration is proposed.Based on the relation of material balance in a steady flow system, the method consists in measuring the dew point or bubble point temperature of a solution with gravimetrically determined concentration z by equal volume exchange of y region or x region inside the VLE still into a steady state where z equals to y or x. The equation of equal volume exchange method is deduced from the relation of material balance of the steady state. The technique of the application are discussed in detail. Two newly designed ebulliometers were used successfully. The bubble point of dilute solution and dew point line of some system were measured with good agreement with parallel measurement and thermodynamic consistecy test also gave good results.