“…In this work, a recent perturbation model of Perturbed Chain Polar -Statistical Associating Fluid Theory (PCP-SAFT EoS) [15,25] is also applied that the dimensionless residual Helmholtz free energy (a ୰ୣୱ ) consists of the three terms as a reference hard-chain contribution [46,47] (a ୦ୡ ), a perturbation contribution [48] (a ୢ୧ୱ୮ ) and a quadrupole-quadrupole contribution [25] (a ).…”