用PR状态方程和WS混合规则预测均相共沸  

PREDICTION OF THE HOMOGENEOUS AZEOTROPES USING THE PR EQUATION OF STATE AND WS MIXING RULE

作　　者：董学强[1,2] 公茂琼[1] 张宇 刘军胜[1,2] 吴剑峰[1] 

机构地区：[1]中国科学院理化技术研究所低温工程学重点实验室,北京100190 [2]中国科学院研究生院,北京100049 [3]国家节能中心,北京100045

出　　处：《工程热物理学报》2010年第9期1461-1464,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.50890183)

摘　　要：本文提供了一种二元均相共沸混合物的预测方法。本方法通过UNIFAC基团贡献方法获得WS混合规则所需的二元相互作用系数,然后通过PR状态方程进行相平衡计算以求得平衡压力,再用牛顿迭代法求得使压力对浓度的一阶导数为零的根,从而获得共沸组分,并判断共沸混合物的类型。实例计算显示,预测结果与实验数据具有良好的一致性。A method was presented to predict the binary homogeneous azeotropes. In this method, the UNIFAC model was used to calculate the binary interaction parameters of the WS mixing rule, and then the PR equation of state was used to obtain the pressure of the mixture. Newton＇s method was used to compute the root which makes the first derivative of the pressure with respect to the composition equal to zero. The root is the azeotropic composition for the azeotropic mixture. The type of the azeotropes can also be determined. This method was verified by the experimental data, and good agreement was obtained.

关 键 词：均相共沸物 PR状态方程 WS混合规则 牛顿迭代法 

分 类 号：TK123[动力工程及工程热物理—工程热物理]