CIESC Journal ›› 2019, Vol. 70 ›› Issue (3): 830-839.doi: 10.11949/j.issn.0438-1157.20181154

• Thermodynamics • Previous Articles     Next Articles

Measurements and simulation for ternary system KCl-PEG4000-H2O at 288, 298 and 308 K

Xudong YU1,2,3(),Qin HUANG1,Lin WANG1,Maolan LI1,Hong ZHENG1,Ying ZENG1,3   

  1. 1. College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, Sichuan, China
    2. Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
    3. Center of Panxi Strategic Mineral Resources Multi-Purpose Utilization, Chengdu 610059, Sichuan, China
  • Received:2018-10-08 Revised:2018-12-18 Online:2019-03-05 Published:2018-12-26
  • Contact: Xudong YU


The phase equilibrium relationship of the ternary system KCl-PEG4000-H2O at 288, 298 and 308 K was studied by isothermal dissolution equilibrium method. The corresponding phase diagram, density-composition diagram and refractive index-composition diagram were drawn. The results show that over the entire PEG 4000 composition rang studied only one liquid phase is obtained, without the biphase region formed at 288, 298 and 308 K. The phase diagram of system KCl-PEG4000-H2O consists of one homogeneous area with unsaturated liquid (L), an equilibrium area containing the solid phase of KCl and saturated liquid phase (S+L), one area with one liquid phase and two solid phases(2S+L). The area of (2S+L) decrease with the increasing of temperature, while the areas of (L) and (S+L) increase with the increasing of temperature. The solubility of KCl decreases with the addition of PEG 4000 at 288, 298 and 308 K. When wPEG4000 in the solution is less than 0.50, the temperature has little effect on the salting-out ratio of the system, while when wPEG4000 is higher than 0.50, the salting-out ratio of the system decreases with the increasing of temperature. The thermodynamics calculation of equilibrium data of system KCl-PEG4000-H2O at 288, 298 and 308 K was carried out by using the modified Pitzer equation, it can be seen from the comparison of experimental and calculation diagrams that the predictive solubilities agree well with the experimental values.

Key words: phase equilibria, thermodynamic properties, solubility, mixed solvents, Pitzer equation

CLC Number: 

  • O 642


Solubility for KCl in pure water at 288,298 and 308 K: ●,▲,■ solubility for KCl at 288,298 and 308 K by this work,○,Δ,□ solubility for KCl at 288,298 and 308 K from literatures[23,24,25,26,27,28]"

Table 1

Solubility of KCl in pure water at 288,298 and 308 K"

T/KSolubility/(g/g)Relative deviation(RD)
This workRef.














Refractive index,nDComposition of equilibrated solutionRComposition of wet solid phase


solid phase

T=288 K
T=298 K
T=308 K


Phase diagram of KCl-PEG4000-H2O at 288,298 and 308 K"


Salting-out ratio(R) for KCl-PEG4000-H2O at 288,298 and 308 K"


Phase diagram of KCl-PEG4000-H2O at 288,298 and 308 K"


Comparison of phase diagrams of Ref.[16] and experimental for KCl-PEG4000-H2O at 298 K"


Diagrams of density vs composition and refractive index vs composition for system KCl-PEG4000-H2O at 288,298 and 308 K"

Table 3

Binary parameters and cross parameters for ternary system KCl-PEG4000-H2O at 288,298 and 308 K"



Experimental and calculation phase diagram of KCl-PEG4000-H2O at 288,298 and 308 K"

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