Isobaric Vapor-Liquid Equilibria for the Formic Acid- N-methyl-2-pyrrolidone Binary System at 50, 20, and 10 kPa and Modeling Using the NRTL-HOC and PC-SAFT Models

Abstract

Isobaric vapor-liquid equilibrium (VLE) data for a binary system of formic acid and N-methyl-2-pyrrolidone were measured at 50, 20, and 10 kPa in a dynamic equilibrium cell. The VLE data were validated for their thermodynamic consistency by applying the Redlich-Kister area tests. Furthermore, the density data were determined using a densimeter over the entire concentration range. The experimental VLE data were then correlated using the nonrandom two-liquid Hayden and O'Connell activity coefficient model and the perturbed chain-statistical associating fluid theory equation of state. The results are consistent with the experimental data based on absolute deviation, root-mean-square deviation, and the average absolute deviation for the temperature and mole fraction of the vapor phase for the two models. ？ 2021 American Chemical Society.