Solubility of Potassium Acetate in Water, 2,2,2-Trifluoroethanol, Ethanol and Their Binary Mixtures at 288.15–333.15 K

The potassium acetate solutions are new potential working fluids for the closed-type reverse electrodialysis(RED) power generation system driven by thermal energy. In this paper, the solubilities of potassium acetate in water, 2,2,2-trifluoroethanol, ethanol and their binary mixtures were measured by using the laser dynamic method over the temperature range of 288.15 to 333.15 K under atmospheric pressure. The results indicate that the solubility of potassium acetate solution is influenced by both the solvent components and solution temperature evidently. Besides, it is found that the measured solubility data of the potassium acetate-water-2,2,2-trifluoroethanol solutions as per the laser dynamic method are slightly larger than that of the data obtained as per the static method. Finally, five correlation models, including the Van’t Hoff model, Modified Apelblat model, Yaws model, λh model and Modified Apelblat-Jouyban-Acree model, were used to correlate the measured solubility data of those potassium acetate solutions, with the relative standard deviations within 0.23% to 1.58%.