The applicability of the Ohta approach to vapour-liquid equilibria and liquid excess enthalpy calculations using the PRSV EOS with the Wong-Sandler mixing rules

The Peng-Robinson-Stryjek-Vera equation of state (PRSV EOS), coupled with the Wong-Sandler mixing rules (WS), was employed to correlate the vapour-liquid equilibria (VLB) and liquid molar excess enthalpy (H^E) data of ten binary systems exhibiting various complexities (asymmetric systems, systems with polar and associated components, etc.). In the WS mixing rule the NRTL qeuation was incorporated, vhereby the nonrandomness parameter α₁₂ and the second virial coefficient binary interaction parameter k₁₂ were treated as constants. The Ohta approach was used for the generation of the parameters Τ₁₂ and t₂₁ in the VLE and H^E calculations. The obtained VLE results can, in most cases, be considered very good, whereas the H^E results may be generally regarded as acceptable.