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Salt Effect on the Isobaric Vapor-Liquid Equilibrium Study of Binary Mixtures H2O-NMP (N-Methyl-2-pyrrolidone)
Baorong Wang1, Hongliang Qian2, Ziya Gao1
1Department of Chemical Engineering, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China.
Abstract:
To study the salt effect of recovering N-methyl-2-pyrrolidone (NMP) from the waste liquid produced in the polyphenylene sulfide (PPS) synthesis process, this study presents vapor-liquid equilibrium (VLE) measurement and correlation for water + NMP, water + NMP + lithium chloride, and water + NMP + sodium chloride at p = 101.3 kPa. The salt effect is discussed and the salts follow the order of lithium chloride > sodium chloride. The NRTL model was used for the correlation with binary parameters of water + NMP, water + NMP + lithium chloride, and water + NMP + sodium chloride. The correlation showed good agreement with experimental data; root-mean-square deviations are less than 0.48 K for the equilibrium temperature and 0.005 for the vapor-phase mole fraction of water.
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