On extension of UNIQUAC-NRF model to study the phase behavior of aqueous two phase polymer-salt systems

被引：32
作者：
Haghtalab, A [1 ]
Mokhtarani, B [1 ]
机构：
[1] Tarbiat Modarres Univ, Dept Chem Engn, Tehran, Iran
来源：
FLUID PHASE EQUILIBRIA | 2001年 / 180卷 / 1-2期
关键词：
activity coefficient; gibbs excess energy; aqueous two phase system; salt; UNIQUAC-NRF; liquid-liquid equilibria; polyethylene glycol;
D O I：
10.1016/S0378-3812(00)00518-5
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
The UNIQUAC-NRF model for aqueous two-phase polymer-polymer systems is extended to correlate liquid-liquid equilibria of aqueous polymer-salt two-phase systems. The systems investigated are polyethylene glycol + ammonium sulfate + water and polyethylene glycol + potassium monohydrogen phosphate (K2HPO4) + water for five molecular weights of PEG. In this model, the nonrandom state is selected as a reference state. The model has six binary adjustable parameters that were determined by an optimization program. The Debye-Huckel equation based on Fowller-Guggenheim equation is used to calculate the long-range electrostatic interaction of the ions. The results obtained by this model are in good agreement with experimental data. (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：139 / 149
页数：11
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