Implementation of PC-SAFT and SAFT + Cubic for modeling thermodynamic properties of eight 1-alkenes and their mixtures

Abstract

In the current study the widely used theoretically based model PC-SAFT and the recently proposed SAFT+Cubic have been implemented for correlating and predicting various thermodynamic properties of 1-Hexene, 1-Heptene, 1-Octene, 1-Nonene, 1-Decene, 1-Dodecene, 1-Tetradecene, and 1-Hexadecene, and the available high pressure data on their mixtures. Unlike PC-SAFT, SAFT+Cubic is capable of correlating the critical and subcritical pure compound data simultaneously. In addition, SAFT+Cubic is advantageous in predicting the isothermal compressibility factors and sound velocities. It is also superior in correlating the complex phase behavior in the asymmetric systems {Methane(1)+1-Hexene(2)} and {Methane(1)+1-Heptene(2)}. Overestimation of critical temperatures and pressures affects the accuracy of PC-SAFT in predicting VLE in the system {n-Hexane(1)+1-Hexadecene(2)}. At the same time, this disadvantage of PC-SAFT possibly turns into advantage while modeling the VLE data of {Carbon Dioxide(1)+1-Hexene(2)}. As seems, both of them are capable of only rough estimation of the heat capacity data.