Measurement and correlation of solid-liquid phase equilibria for binary and ternary systems consisting of N-vinylpyrrolidone, 2-pyrrolidone and water

doi:10.1016/j.cjche.2017.09.012

Abstract

Abstract: The solid-liquid equilibria (SLE) for binary and ternary systems consisting of N-Vinylpyrrolidone (NVP), 2-Pyrrolidone (2-P) and water are measured. The phase diagrams of NVP (1) + 2-P (2), NVP (1) + water (2), NVP (1) + 2-P (2) + 1 wt% water (3) and NVP (1) + 2-P (2) + 2 wt% water (3) are identified as simple eutectic type with the eutectic points at 263.75 K (x_1E=0.5427), 251.65 K (x_1E=0.3722), 260.25 K (x_1E=0.5031) and 256.55 K (x_1E=0.4684), respectively. The phase diagram of 2-P (1) + water (2) has two eutectic points (x_1E=0.1236, T_E=259.15 K and x_1E=0.7831, T_E=286.15 K) and one congruent melting point (x_1C=0.4997, T_C=303.55 K) because of the generation of a congruently melting addition compound:2-P·H₂O. The ideal solubility and the UNIFAC models were applied to predict the SLE, while the Wilson and NRTL models were employed in correlating the experimental data. The best correlation of the SLE data has been obtained by the Wilson model for the binary system of NVP + 2-P. The UNIFAC model gives more satisfactory predictions than the ideal solubility model.

Key words: Phase equilibria, Thermodynamics, Model, N-vinylpyrrolidone, 2-Pyrrolidone, Water

摘要： The solid-liquid equilibria (SLE) for binary and ternary systems consisting of N-Vinylpyrrolidone (NVP), 2-Pyrrolidone (2-P) and water are measured. The phase diagrams of NVP (1) + 2-P (2), NVP (1) + water (2), NVP (1) + 2-P (2) + 1 wt% water (3) and NVP (1) + 2-P (2) + 2 wt% water (3) are identified as simple eutectic type with the eutectic points at 263.75 K (x_1E=0.5427), 251.65 K (x_1E=0.3722), 260.25 K (x_1E=0.5031) and 256.55 K (x_1E=0.4684), respectively. The phase diagram of 2-P (1) + water (2) has two eutectic points (x_1E=0.1236, T_E=259.15 K and x_1E=0.7831, T_E=286.15 K) and one congruent melting point (x_1C=0.4997, T_C=303.55 K) because of the generation of a congruently melting addition compound:2-P·H₂O. The ideal solubility and the UNIFAC models were applied to predict the SLE, while the Wilson and NRTL models were employed in correlating the experimental data. The best correlation of the SLE data has been obtained by the Wilson model for the binary system of NVP + 2-P. The UNIFAC model gives more satisfactory predictions than the ideal solubility model.

关键词: Phase equilibria, Thermodynamics, Model, N-vinylpyrrolidone, 2-Pyrrolidone, Water

Ao Su, Sifang Li. Measurement and correlation of solid-liquid phase equilibria for binary and ternary systems consisting of N-vinylpyrrolidone, 2-pyrrolidone and water[J]. Chin.J.Chem.Eng., 2018, 26(4): 806-811.

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