摘要：A new modified EOS-G(E) model is developed for the highly asymmetric paraffinic systems, where the volume translated Peng-Robinson EOS is adopted coupled with the LCVM mixing rule. In the new modified EOS-G(E) model, the original UNIFAC is replaced by a newly established UNIFAC where the nonlinear calculation of the segment fractions of molecules in gamma(C) (the combinatorial activity coefficient) is introduced to modify the traditional assumption that "all groups are isotropic in solution". A total of 956 vapor-liquid experimental bubble points in highly asymmetric paraffinic systems including binary systems, ternary systems, quaternary systems and multiple systems are used to test the new developed EOS-GE model. Results show that the original UNIFAC and the improved UNIFAC both perform well if the molefractions of light components (CH4 or C2H6) are low; however, with the increase of the light components, the improved UNIFAC is remarkably superior to the original UNIFAC.

关键字：Thermodynamics Vapor-liquid equilibrium Asymmetric paraffinic system EOS-G(E) UNIFAC Activity coefficient

ISSN号：0920-4105

卷、期、页：卷: 159 页: 810-817

发表日期：2017-11-01

期刊分区（SCI为中科院分区）：三区

收录情况：SCI（科学引文索引印刷版）,ESI（基本科学指标数据库）,EI（工程索引）,SCIE（科学引文索引网络版）

发表期刊名称：JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING

参与作者：李清平,姚海元

通讯作者：杨居衡,石国赟,黄辉荣,王丹

第一作者：宫敬,王玮,史博会

论文类型：期刊论文

论文概要：杨居衡,宫敬,石国赟,黄辉荣,王丹,王玮,李清平,史博会,姚海元，Prediction of vapor-liquid equilibrium in highly asymmetric paraffinic systems with new modified EOS-G(E) model，JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING，2017，卷: 159 页: 810-817

论文题目：Prediction of vapor-liquid equilibrium in highly asymmetric paraffinic systems with new modified EOS-G(E) model