Two Proposed Vapor-Pressure Equations——Investigation on Applicability to High-Pressures

Zhang Jianhou (Chien-Hou Chang); Ma Peisheng and Xu Ming(Department of Chemical Engineering; Tianjin University)

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Two Proposed Vapor-Pressure Equations——Investigation on Applicability to High-Pressures

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- Two Proposed Vapor-Pressure Equations——Investigation on Applicability to High-Pressures
- CIESC Journal Issue 1, (1986)
- 作者机构：
  
  天津大学化工系,天津大学化工系,天津大学化工系
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Online First：25 March 1986，
  
  Published：25 March 1986
- 稿件说明：
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Zhang Jianhou (Chien-Hou Chang), Ma Peisheng and Xu Ming(Department of Chemical Engineering, Tianjin University). Two Proposed Vapor-Pressure Equations——Investigation on Applicability to High-Pressures[J]. CIESC Journal, 1986, (1).
DOI：

Zhang Jianhou (Chien-Hou Chang), Ma Peisheng and Xu Ming(Department of Chemical Engineering, Tianjin University). Two Proposed Vapor-Pressure Equations——Investigation on Applicability to High-Pressures[J]. CIESC Journal, 1986, (1). DOI：

摘要

提出了液体蒸汽压的半理论关联方程式(Ⅰ)logP=A-B/T~N和经验性改进的Antoine方程式(Ⅱ)logP=A-B/T-C+DT~M.用(Ⅰ)、(Ⅱ)、Antoine方程式(Ⅲ)logP=A-B/T-C和Thodos等的方程式(Ⅳ)lohP=A-B/T~N+CT~M对68种物质的近期(1962年一1982年)“高压范围”的1631数据点分别进行拟合

结果表明

它们都能适用于直到临界点的压力范围.总平均百分误差ε_(nv)对三常数方程式约为0.4

对四常数方程式改为0.2.对于四常数方程式

M值的影响不明显

一般可用M=1.列出了68种物质的方程式(Ⅰ)和(Ⅱ)的常数值.对于一般计算

上述两个三常数方程式(Ⅰ)和(Ⅲ)可以满足要求

在数学处理上(Ⅰ)较方便.

Abstract

A semitheoretical equation

log P=A- (B/TN) (I)

and an empiricallymodified Antoine equation

logP= A-(B/T-C)+DTM(Ⅱ)

are proposed for cor- relating liquid pressure with temperature. These two equations together with the regular Antoine equation

logP=A-(B/T-C) (Ⅲ)

and the equation

logP = A-(B/TN) + CTM (Ⅳ)

proposed by Thodos et al.

have been used to fit the high-pressure data of 1631 points for 68 substances

published since 1962 through 1982. The results show that all these four equations are applicable up to the critical points. The grand average deviations between the calculated and experimental values are about 0.4% for the three-constant equations ( I ) and (Ⅲ)

and about 0.2% for the four-constant equations(Ⅱ) and (Ⅳ). The effect of adopting different values of M in equations (Ⅱ) and (IV) is not significant

and M=l is therefore suggested. The values obtained for the parameters of equations ( I ) and ( Ⅱ) are presented for the 68 substances. The three-constant equations ( I ) and (Ⅲ) are recommended for general use

equation (I) being more convenient than (Ⅲ) for mathematical treatment.

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