Calculation of Critical Loci of Mixtures by MH Equation of State with DDLC Mixing Rule

胡望明; 侯虞钧; 郭锡平

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Calculation of Critical Loci of Mixtures by MH Equation of State with DDLC Mixing Rule

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- Calculation of Critical Loci of Mixtures by MH Equation of State with DDLC Mixing Rule
- CIESC Journal Issue 4, (1991)
- 作者机构：
  
  浙江大学化工系,浙江大学化工系,杭州家用电器公司 ,杭州,杭州
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Online First：25 August 1991，
  
  Published：25 August 1991
- 稿件说明：
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胡望明, 侯虞钧, 郭锡平. Calculation of Critical Loci of Mixtures by MH Equation of State with DDLC Mixing Rule[J]. CIESC Journal, 1991, (4).
DOI：

胡望明, 侯虞钧, 郭锡平. Calculation of Critical Loci of Mixtures by MH Equation of State with DDLC Mixing Rule[J]. CIESC Journal, 1991, (4). DOI：

摘要

一、引言状态方程能否精确地描述流体混合物热力学性质

建立合适的混合规则是一个重要因素.近十年来

许多研究者把局部组成概念引入立方型状态方程

建立了与密度有关的局部组成(DDLC)混合规则

将两类重要的热力学模型——状态方程和活度系数方程联系起来

大大地改善了状态方程应用于高密度区时的柔软性

改进了状态方程描述极性一非极性、含超临界组分等高度非对称体系的精确度.作者将局部组成概念引入多参数的MH状态方程

椎导了MH方程的DDLC混合规则

用于计算高压汽液平衡和二元混合物临界轨迹.本文将介绍后者的计算情况.

Abstract

The DDLC mixing rule has been developed for MH equation of state on the basis of two-fluid theory and the local mole fraction expression of a generalized NRTL model. It can be used to correlate the properties of most fluids under high pressure. The critical loci of 7 binary hydrocarbon mixtures and 17 typical binary systems

including polar-polar and nonpolar-polar system

are calculated by using the new mixing rule and the criteria for the critical point of a mixture suggested by Heidemann and Khalil. The accuracy is better than or comparable to commonly used cubic equation of state

and the improvement of evaluating Vc is most remarkable.

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