Abstract—In this research, the prediction of vapor-liquid equilibrium (VLE) of the binary mixture of propylene+propane from the combined use of the Peng-Robinson equation of state (PR-EOS) and the COSMO-RS model is examined. Following the Van der Waals mixing rule (VdW), the average deviations in both the pressure and vapor phase composition from the method are no more than 0.32% and 0.57%, respectively. Based on the results, it has been shown that PR-EOS+VdW+COSMO-RS is a promising approach for propylene+propane VLE predictions over a wide range of temperatures. This method introduces only one adjustable parameter. Assuming the adjustable parameter as a function of temperature, this method is used as a straight forward process without any iteration to estimate VLE data.
Index Terms—COSMO-RS, Peng-Robinson equation of state, propane, propylene, vapor-liquid equilibrium.
The authors are with with the China University of Petroleum, Beijing, 102249, China (Corresponding author: Yansheng Liu; e-mail: wsuper@cup.edu.cn, zhoushan1987@hotmail.com, 634660245@qq.com).
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Cite: Xinyun Pu, Lehuan Wu, and Yansheng Liu, "Prediction of Vapor-Liquid Equilibrium Properties for the Mixture of Propylene+Propane from the Combined Use of Peng-Robinson Equation of State and COSMO-RS Model," International Journal of Chemical Engineering and Applications vol. 8, no. 2, pp. 92-96, 2017.
