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《中国化学工程学报(英文版)》 2008-05
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Analysis and Comparison of the Alpha Functions of SRK Equation of State

LUO Mingjian 1,HU Bing 1 ,JIANG Tao 1 ,XIA Shuqian 2 and MA Peisheng2 1 School of Chemistry and Chemical Engineering,Daqing Petroleum Institute,Daqing 163318,China 2Key Laboratory for Green Chemical Technology,School of Chemical Engineering and Technology,Tianjin Uni- versity,Tianjin 300072,China  
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 meth- ane-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 tem- perature range,which sustained the conclusions of phase equilibria calculation.Luo’s alpha function keeps de- creasing when Tr1 and becomes negative at sufficient high temperature,thus the conventional cubic equation of state expressed pressure as the sum of repulsion pressure pR(0),and attraction pressure pA(0)could be im- proved to be the sum of hard-sphere repulsion pressure pH(0)and intermolecular force pressure pI(pI0 at low temperature and pI0 at sufficient high temperature).
【CateGory Index】: O621.1
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【References】
Chinese Journal Full-text Database 1 Hits
1 YANG Quan 1,,ZHU Shenlin 2 and LI Yigui 2 1Key Laboratory of Energy Resources & Chemical Engineering,Ningxia University,Yinchuan 750021,China 2Department of Chemical Engineering,Tsinghua University,Beijing 100084,China;Prediction of Critical Endpoints Based on the PR Equation of State[J];中国化学工程学报(英文版);2009-05
【Co-references】
Chinese Journal Full-text Database 1 Hits
1 CHEN Zhen-hua1, CAO Kun1,2, YAO Zhen1, HUANG Zhi-ming1 (1. State Key Laboratory of Chemical Engineering (zju), Institute of Polymer Engineering, Department of Chemical and Biochemical Engineering, Zhejiang University, Hangzhou 310027, China; 2. State Key Laboratory of Chemical Engineering(ECUST) UNLIAB Research Center of Chemical Reaction Engineering, , School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China);Comparison of Different Mixing Rules in the Calculation of Critical Properties for Binary Mixtures Based on PR Equation of State[J];Journal of Chemical Engineering of Chinese Universities;2008-03
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