气体与长链烃类体系的相平衡模型研究  

Vapor-Liquid Equilibria Calculation for Gas-Long Chain Alkane Systems

作　　者：李留定[1] 高军[2] 朱兆友[1] 汝绍刚[1] 

机构地区：[1]青岛科技大学化工学院,青岛266042 [2]山东科技大学化学与环境工程学院,青岛266510

出　　处：《天然气化工—C1化学与化工》2004年第3期65-69,共5页Natural Gas Chemical Industry

摘　　要：基于气体与长链烃类非对称物系的结构与大小不同的特点,及在压力无穷大时,状态方程的引力项可以忽略的情况下,假定AE∞(等于零,结合Patel Teja状态方程,给出了一个能够较好的描述该类物系相平衡的的热力学模型。本文对乙烯,CO2和甲烷气体与长链烃类的相平衡实验数据进行了关联计算,并与MHV1、LCVM和vanderWaals(vdW)等模型的计算结果进行了比较,并考核了气体与烃类的三元物系CO2 C15H32 C16H34、和CH4 C2H6 C22H46,结果表明本模型的计算结果优于MHV1,LVCM和vdW模型。A new mixture rule for van der Waals-type three parameter cubic equation of state (PT EOS) was proposed, which based on the assumption that the contribution of the attractive term to pressure can be neglected and the excess Helmholtz free energy at infinite pressure is zero, and was tested with various binary and ternary asymmetric systems, such as C_2H_4-alkane, CO_2-alkane, CH_4-alkane, etc. Meanwhile, the calculated results of this model were compared to those of MHV1, LVCM, which is liner combination of MHV1 and Michelsen mixing rule, and van der Waals (vdW) models. It's shown that the accuracy of this model was improved greatly than MHV1 model and better than LCVM and vdW models.

关 键 词：PT状态方程 混合规则 非对称物系 相平衡 

分 类 号：TQ013.1[化学工程]