SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2020, Vol. 28 ›› Issue (12): 3079-3085.DOI: 10.1016/j.cjche.2020.07.002

• Chemical Engineering Thermodynamics • Previous Articles     Next Articles

The effect of temperature on phase equilibria of polyethylene glycol (PEG8000)-K2SO4-H2O at T=(288.15, 298.15, 308.15) K

Shuai Chen, Niancu Chen, Hong Zheng, Xudong Yu, Ying Zeng   

  1. College of Materials and Chemistry & Chemical Engineering, Mineral Resources Chemistry Key Laboratory of Sichuan Higher Education Institution, Chengdu University of Technology, Chengdu 610059, China
  • Received:2020-02-20 Revised:2020-06-17 Online:2021-01-11 Published:2020-12-28
  • Contact: Xudong Yu
  • Supported by:
    This work was financially supported by the National Natural Science Foundation of China (U1507111).

The effect of temperature on phase equilibria of polyethylene glycol (PEG8000)-K2SO4-H2O at T=(288.15, 298.15, 308.15) K

Shuai Chen, Niancu Chen, Hong Zheng, Xudong Yu, Ying Zeng   

  1. College of Materials and Chemistry & Chemical Engineering, Mineral Resources Chemistry Key Laboratory of Sichuan Higher Education Institution, Chengdu University of Technology, Chengdu 610059, China
  • 通讯作者: Xudong Yu
  • 基金资助:
    This work was financially supported by the National Natural Science Foundation of China (U1507111).

Abstract: The phase behavior of potassium sulfate (K2SO4) in polyethylene glycol with molecular weight 8000 (PEG8000) and water (H2O) mixed solvent at 288.15, 298.15, and 308.15 K were determined. According to the results, when the temperature are 288.15 and 298.15 K, there is only a solid-liquid phase equilibrium relationship in the system, and the phase diagrams are both divided into three parts which respectively are the regions of unsaturated homogeneous liquid (L), one liquid and one solid K2SO4 (L + S) and one liquid and two solids K2SO4 and PEG8000 (L + 2S). The solubility of K2SO4 in PEG8000-H2O mixed solvent decreased with the addition of the PEG8000 in the solution. Comparing the diagrams of 288.15 and 298.15 K, the sizes of regions of (L) and (L + S) increased and that of (L + 2S) decreased with the increase of temperature. While at 308.15 K, solid-liquid and liquid-liquid equilibrium coexist, and there are six parts in the complete phase diagram at 308.15 K, adding the areas of one liquid and one solid K2SO4 (L + S), two liquids (2 L), two liquids and one solid K2SO4 (2 L + S). The equations developed by Merchuk, Hu, and Jayapal were used to fit the binodal curves data of the system at 308.15 K, meanwhile, the experimental tie-line data of the system at 308.15 K were correlated by Othmer-Tobias equation and Bancroft equation.

Key words: K2SO4, Phase diagram, Solubility, Mixed solvent, Multitemperature

摘要: The phase behavior of potassium sulfate (K2SO4) in polyethylene glycol with molecular weight 8000 (PEG8000) and water (H2O) mixed solvent at 288.15, 298.15, and 308.15 K were determined. According to the results, when the temperature are 288.15 and 298.15 K, there is only a solid-liquid phase equilibrium relationship in the system, and the phase diagrams are both divided into three parts which respectively are the regions of unsaturated homogeneous liquid (L), one liquid and one solid K2SO4 (L + S) and one liquid and two solids K2SO4 and PEG8000 (L + 2S). The solubility of K2SO4 in PEG8000-H2O mixed solvent decreased with the addition of the PEG8000 in the solution. Comparing the diagrams of 288.15 and 298.15 K, the sizes of regions of (L) and (L + S) increased and that of (L + 2S) decreased with the increase of temperature. While at 308.15 K, solid-liquid and liquid-liquid equilibrium coexist, and there are six parts in the complete phase diagram at 308.15 K, adding the areas of one liquid and one solid K2SO4 (L + S), two liquids (2 L), two liquids and one solid K2SO4 (2 L + S). The equations developed by Merchuk, Hu, and Jayapal were used to fit the binodal curves data of the system at 308.15 K, meanwhile, the experimental tie-line data of the system at 308.15 K were correlated by Othmer-Tobias equation and Bancroft equation.

关键词: K2SO4, Phase diagram, Solubility, Mixed solvent, Multitemperature