Aqueous two-phase systems of polyoxyethylene lauryl ether and potassium gluconate/potassium oxalate/potassium citrate at different temperature- experimental results and modeling of (liquid plus liquid) equilibrium data

作者：Lu, Yang; Hao, Tongfan; Zhou, Yan; Han, Juan; Tan, Zhenjiang; Yan, Yongsheng^*

来源：Journal of Chemical Thermodynamics, 2014, 71: 137-147.

DOI：10.1016/j.jct.2013.12.005

• Aqueous two-phase system
• Polyoxyethylene lauryl ether
• Potassium gluconate
• Potassium oxalate
• Potassium citrate
• (Liquid plus liquid) equilibrium

The binodal data for the systems containing the POELE10 and KC6H11O7/K2C2O4/K3C6H5O7 were determined at the T = (288.15, 298.15, 308.15) K. The three experiential equations were used to fit the binodal data and they achieved the satisfactory fitting effect. The effect of salt type on the phase-seperation ability of salt was studied. It was found that the phase-seperation ability of the salt with the higher valence anion is stronger than that with lower valence anion, namely, the order of the phase-seperation ability for the investigated salts is potassium citrate > potassium oxalate > potassium gluconate, which is also validated by the effective excluded volume (EEV). The (liquid + liquid) equilibrium data for the studied systems were determined and correlated by using the Pitzer-Debye-Huckel equation and Chen-NRTL model along with the Flory-Huggins equation, and good agreement was obtained with using these thermodynamic models.

• 出版日期2014-4
• 单位吉林师范大学; 江苏大学