Measurement and Correlation of the Phase Diagram Data for PPG400 + (K3PO4, K2CO3, and K2HPO4) + H2O Aqueous Two-

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• 作者：Xueqiao Xie ; Juan Han ; Yun Wang ; Yongsheng Yan ; Guowu Yin ; Weisheng Guan
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2010
• 出版时间：November 11, 2010
• 年：2010
• 卷：55
• 期：11
• 页码：4741-4745
• 全文大小：154K
• 年卷期：v.55,no.11(November 11, 2010)
• ISSN：1520-5134

文摘

Experimental liquid−liquid equilibrium (LLE) binodal curves, tie-lines, and plait points were obtained for the PPG₄₀₀ + salt (K₃PO₄, K₂CO₃, and K₂HPO₄) + H₂O systems at T = 298.15 K. The Merchuk equation was used to correlate the binodal data of the investigated systems. Also, the effect of salt on the phase-forming ability has been studied based on the effective excluded volume (EEV) values from fitting the binodal data to the binodal model developed by Guan, and the salting-out abilities of the anions are in the order of PO₄³⁻ > HPO₄²⁻ > CO₃²⁻, which may be related to the Gibbs free energy of hydration of the ions (Δ_hydG). Furthermore, tie-line compositions were correlated using the Setschenow-type, Othmer−Tobias, and Bancroft equations, and the parameters are reported.