“…Peng-Robinson equation of state (PR EoS) has been applied successfully for the modeling of properties of different types of binary and ternary systems. − The relationship between absolute pressure ( P ), absolute temperature ( T ), and molar volume ( V ) is given by eq : P = R T V − b − a V false( V + b false) + b false( V − b false) where a represents the cohesive parameter and b represents the repulsive parameter, which are given by eqs and , respectively, a i = 045724 ( R T c , i ) 2 p c , i α i b i = 0.07780 R T c , i p c , i where α i , P c,i , and T c,i are the thermal cohesion function, the critical absolute pressure, and critical temperature for the pure fluid, respectively. We use the thermal cohesion function that is given by the equation proposed by Sheng and Lu, which is defined according to eq : α i = 1 + ...…”