Analysis and Comparison of the Alpha Functions of SRK Equation of State

罗明检; 胡冰; 姜涛; 夏淑倩; 马沛生

doi:10.1016/S1004-9541(08)60153-6

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Analysis and Comparison of the Alpha Functions of SRK Equation of State

Updated：2026-01-06

- Analysis and Comparison of the Alpha Functions of SRK Equation of State
- Chinese Journal of Chemical Engineering Vol. 16, Issue 5, Pages: 766-771(2008)
- Affiliations：
  
  1. School of Chemistry and Chemical Engineering, Daqing Petroleum Institute,Daqing,China,163318
  2. Key Laboratory for Green Chemical Technology, School of Chemical Engineering and Technology, Tianjin University,Tianjin,China,300072
- Author bio：
- Funds：
- DOI：10.1016/S1004-9541(08)60153-6
  CLC：
- Published：2008
- Accepted：
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LUO Mingjian, HU Bing, JIANG Tao, XIA Shuqian, MA Peisheng. Analysis and Comparison of the Alpha Functions of SRK Equation of State[J]. , 2008, 16(5): 766-771.
DOI：

LUO Mingjian, HU Bing, JIANG Tao, XIA Shuqian, MA Peisheng. Analysis and Comparison of the Alpha Functions of SRK Equation of State[J]. , 2008, 16(5): 766-771. DOI： 10.1016/S1004-9541(08)60153-6.

摘要

Abstract

Alpha functions of Soave-Redlich-Kwong(SRK)equation of state proposed by Soave

Twu

and Luo were different in mathematic tendency.They were compared in modeling methane-alkanes equilibria with van der Waals mixing rule and Modified Huron-Vidal(MHV1)mixing rule

respectively.Results showed that Luo's alpha function was a little more accurate than Soave's

and Twu's alpha function lacked accuracy in modeling methane-alkanes equilibrium.SRK equation of state was expanded as virial form

and then the equivalent terms were contrasted with terms of virial equation of state.Results showed that Soave's and Luo's alpha functions matched the tendency of virial coefficient better than Twu's

and Luo's alpha function matched better than Soave's in wide temperature range

which sustained the conclusions of phase equilibria calculation.Luo's alpha function keeps decreasing when

1 and becomes negative at sufficient high temperature

thus the conventional cubic equation of state expressed pressure as the sum of repulsion pressure

(0)

and attraction pressure

(0)could be improved to be the sum of hard-sphere repulsion pressure

(0)and intermolecular force pressure pI(pI0 at low temperature and

0 at sufficient high temperature).

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