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A Simple Densimetric Method to Determine Saturation Temperature of Aqueous Potassium Chloride Solution

Wojciech Bogacz, Mohsen H Al-Rashed, Marcin Lemanowicz, Janusz Wójcik
Journal of Solution Chemistry 2016, 45: 1071-1076
The precise control of crystallization is a key issue in providing a high quality crystalline product. It has to be achieved by, among other means, a proper choice of the solution processing temperature, which is determined on the basis of the metastable zone width and type of solubility curve. In this article experimental data for potassium chloride solution density, as a function of temperature and its correlation in the range from under- to supersaturation, are reported for solution concentrations between 24.62 % w/w and 31.84 % w/w. As could be expected in the case of undersaturated solutions and low supersaturation, the temperature dependence of density for solutions of different saturation may be described by a linear equation within the investigated range of concentrations. It was also proved that for the undersaturation range there exists a pole point, which allows calculation of the saturation temperature, based on the density measured at any temperature.


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