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Food grade (K 2 CO 3  wt.%&gt;99.0%, GB/T 25588-2010) potassium carbonate (K 2 CO 3 ) has been extracted from low concentration [K + ] solutions of K 2 CO 3 -Na 2 CO 3 -H 2 O, which refers to a subsystem of brine water in the Lop Nor Lake in West China. Procedures of the isothermal evaporation, crystallization, CO 2  acidification, filtration, and calcination were employed to prepare the K 2 CO 3 . This research focuses on the phase study of metastable equilibria between K 2 CO 3 -Na 2 CO 3 -H 2 O and KHCO 3 -NaHCO 3 -H 2 O. The solubility, density, conductivity, and pH values were determined. Phase diagrams were plotted at temperatures of 298.2 and 313.2 K. At 298.2 K the ternary system of K 2 CO 3 -Na 2 CO 3 -H 2 O was found to have double salts in form of solid solutions Na 2 CO 3 ·K 2 CO 3 ·(6–12)H 2 O, which would hinder the process of getting pure K 2 CO 3  by the means of isothermal evaporation. In this protocol the high-pressure CO 2  was charged to the ternary carbonate solution, and the K 2 CO 3 -Na 2 CO 3 -H 2 O was moved to bicarbonate system KHCO 3 -NaHCO 3 -H 2 O. This quaternary system is of a simple co-saturation type of diagram, in which a solid solution (KHCO 3 ·NaHCO 3 ) was found to be greatly affected by temperatures. This finding affords efficient separation of KHCO 3  from the KHCO 3 -NaHCO 3 -H 2 O solutions.

zeitschrift für physikalische chemie

Extraction of K 2 CO 3  from Low Concentration [K + ] Solutions with the Aid of CO 2 : A Study on the Metastable Phase Equilibrium of K 2 CO 3 -Na 2 CO 3 -H 2 O Ternary System