Calculation of Vapor-Liquid Equilibrium Data from Excess Thermodynamic Properties(Ⅱ) ——from Excess Volume

郑炽; 汤沛民

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Calculation of Vapor-Liquid Equilibrium Data from Excess Thermodynamic Properties(Ⅱ) ——from Excess Volume

更新时间：2025-12-16

- Calculation of Vapor-Liquid Equilibrium Data from Excess Thermodynamic Properties(Ⅱ) ——from Excess Volume
- CIESC Journal Issue 4, (1981)
- 作者机构：
  
  上海医药设计院,华东化工学院
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Online First：25 December 1981，
  
  Published：25 December 1981
- 稿件说明：
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郑炽, 汤沛民. Calculation of Vapor-Liquid Equilibrium Data from Excess Thermodynamic Properties(Ⅱ) ——from Excess Volume[J]. CIESC Journal, 1981, (4).
DOI：

郑炽, 汤沛民. Calculation of Vapor-Liquid Equilibrium Data from Excess Thermodynamic Properties(Ⅱ) ——from Excess Volume[J]. CIESC Journal, 1981, (4). DOI：

摘要

从两组或两组以上不同温度的过量体积数据出发

基于“虚拟二液理论”

提出了一套计算汽液平衡数据的程序:（1）求纯组分的特性参数V_i~*

P_i~*和T_i~*（2）求虚拟组分的特性参数V_(im)~*

P_(im)和T_(im)~*（3）求过量焓H~E;（4）求Gibbs过量自由能G~E或其函数Q;（5）求泡点;（6）求汽液平衡数据。对苯-环己烷、苯-正己烷、苯-正庚烷、苯-正辛烷、四氯化碳-苯、四氯化碳-环己烷及四氯化碳-正庚烷的计算结果

与相应的汽液平衡实验数据比较

并与直接从过量焓求汽液平衡数据的计算结果进行对比

比较满意。因此

本计算程序也可适用于低压下的非极性或弱极性二元系统。

Abstract

Starting from isothermal excess volume data (two or more than two sets)

and based on the "pseudo-2-fluid theory"

a computation procedure of vapor-liquid equilibrium data is proposed: (1) Calculation of characteristic parameters of pure components:Vi

Pi and Ti; (2) Calculation of characteristic parameters of pseudocomponents:Vim

Pim and Tim;(3) Calculation of excess enthalpy H; (4) Calculation of Gibbs free energy G or its Q function; (5) Calculation of bubble point; ( 6 ) Calculation of vapor-liquid equilibrium data. The computation results for benzene-cyclohexane

benzene-n-hexane

ben-zene-n-heptane

benzene-n-octane

carbon tetra chloride-benzene

carbon te-trachloride-cyclohexane and carbon tetrachloride-n-heptane

compared with the corresponding vapor-liquid equilibrium experimental data and the data calculated directly from excess enthalpy

are satisfactory. Therefore

the proposed computation procedure is also appropriate to non-polar and slightly polar binary systems under relatively low pressures.

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