Measurement and Correlation of the Phase Equilibrium of Aqueous Two-Phase Systems Composed of Polyethylene(glycol) 1500 or 4000 + Sodium Sulfite + Water at Different Temperatures

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• 作者：Bruno G. Alvarenga ; Luciano S. Virtuoso ; Nelson H. T. Lemes ; Luis A. da Silva ; Anderson F. Mesquita ; Kelany S. Nascimento ; Maria C. Hespanhol da Silva ; Luis H. Mendes da Silva
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2014
• 出版时间：February 13, 2014
• 年：2014
• 卷：59
• 期：2
• 页码：382-390
• 全文大小：341K
• ISSN：1520-5134

文摘

The equilibrium behaviors of two-phase liquid鈥搇iquid systems composed of poly(ethylene glycol) (PEG) 1500 or 4000 + sodium sulfite + water were experimentally determined at temperatures of (288.15, 298.15, 308.15, and 318.15) K. The effects of the molecular weight of PEG and the temperature on the phase separation were studied. The binodal curves were fitted to an empirical equation that correlates the concentrations of PEG 1500 or 4000 and sodium sulfite, and the coefficients for the different temperatures were estimated. The tie-line compositions were estimated and correlated using the Othmer鈥揟obias and Bancroft equations, and the parameters are reported. The liquid鈥搇iquid equilibrium (LLE) experimental data obtained were well-correlated to the activity coefficients of the non-random two-liquid (NRTL) and UNIversal QUAsiChemical (UNIQUAC) models, and the mean deviations were less than 0.36 % and 0.31%, respectively.