Modeling Vapor-liquid Phase Equilibrium of Mixtures Containing Aromatic and N-formyl Morpholine by CPA Equation of State

In this study, at first, by using the experimental vapor pressure and saturated liquid volume of N-formyl morpholine, the parameters of cubic plus association (CPA) equation of state for NFM are evaluated. In this work, five association schemes (1A, 2A, 3B, 4B, and 4C) are used for NFM and the parameters of CPA equation of state are evaluated for these association schemes. Then, bubble point calculation is used for vapor-liquid equilibrium calculation in these mixtures. For this purpose, aromatics were considered as two types; in the first type, aromatics cannot cross associate with NFM and in the second type aromatics can cross association with NFM. Binary interaction parameters between aromatics and NFM were obtained and the modeling results were compared to experimental data and the best association scheme for NFM was obtained. The results show that 4C and 4B association schemes give the best results for correlating vapor-liquid equilibrium of mixtures containing aromatics and NFM.