Liquid−Liquid Equilibrium of Poly(ethylene glycol) 4000 + Diammonium Hydrogen Phosphate + Water at Different Temperatures

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• 作者：Samuthira Pandian Amaresh ; Shreela Murugesan ; Iyyaswami Regupathi ; Thanapalan Murugesan
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2008
• 出版时间：July 2008
• 年：2008
• 卷：53
• 期：7
• 页码：1574 - 1578
• 全文大小：106K
• 年卷期：v.53,no.7(July 2008)
• ISSN：1520-5134

文摘

Liquid−liquid equilibrium for an aqueous two-phase system containing poly(ethylene glycol) 4000 + diammonium hydrogen phosphate + water was studied at four different temperatures of (25, 30, 35, and 45) °C. The binodal curve was fitted to three different empirical equations relating the concentrations of PEG 4000 and diammonium hydrogen phosphate, and the coefficients were estimated for the respective temperatures for all three equations. The effective excluded volume values were obtained from the binodal model for the present system, and salting-out ability of the salt was discussed. Tie line compositions were correlated using the Othmer−Tobias and Bancroft equations, and the parameters are also reported. Further, the experimental binodal data of the poly(ethylene glycol) 4000 + diammonium hydrogen phosphate + water system were compared to poly(ethylene glycol) 6000 + diammonium hydrogen phosphate + water for (25, 35, and 45) °C.