Liquid-Liquid Equilibrium and Physical Properties of Aqueous Mixtures of Poly (Ethylene Glycol) 3000 with Tri-Potassium Citrate at Different pH: Experiment, Correlation and Thermodynamic Modeling

Journal of the Korean Chemical Society

article

Mahnam Ketabi¹  Mohsen Pirdashti¹  Poorya Mobalegholeslam¹ 

[1] Chemical Engineering Department, Faculty of Engineering, Shomal University

关键词: Liquid-liquid equilibrium data;    Density;    Poly(ethylene glycol);    Tri-potassium citrate;    UNIQUAC-FV;   

DOI  :  10.5012/jkcs.2019.63.1.12

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

The new experimental data of liquid-liquid equilibrium (LLE) of aqueous two-phase system (ATPS) consisting of poly(ethylene glycol) 3000 + tri-potassium citrate at different pH were presented. It was found that an increase in pH resulted in the expansion of the two-phase region. The TLL and STL increased with increasing the pH values. The Merchuk equation can be appropriately employed to correlate the binodal curves and also the tie-line compositions were adjusted to both the Othmer-Tobias and Bancroft equations. In order to calculate the compositions of the phase and the ends of the tie-lines, density and refractive indices as two physical properties were used. Finally, the extended UNIQUAC, UNIFAC, Virial-(Mobalegholeslam & Bakhshi) and modified UNIQUAC-FV were used to measure the phase equilibria at different pH. The results of the models suggested that it can be used quite well to correlate the LLE in an aqueous solution of polymer–salt.

【 授权许可】

Unknown