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Citation: SANG Shi-Hua, TANG Ming-Lin, YIN Hui-An, ZENG Ying. A Study on the Phase Equilibrium of the Quaternary System K₂CO₃-Na₂CO₃-Li₂CO₃-H₂O at 288 K[J]. Chinese Journal of Applied Chemistry, ;2004, 21(5): 509-511. shu

A Study on the Phase Equilibrium of the Quaternary System K₂CO₃-Na₂CO₃-Li₂CO₃-H₂O at 288 K

1.
College of Materials and Bioengineering, Chengdu Univerisity of Technology, Chengdu 610059

Corresponding author: SANG Shi-Hua,
Received Date: 30 July 2003
Available Online: 1 December 2003
Fund Project: 国家自然科学基金(49773200)资助课题 (49773200)

The solubilities and properties such as density, electrical conductivity and pH of the solutions in the quaternary system K₂CO₃-Na₂CO₃-Li₂CO₃-H₂O at 288 K have been studied by isothermal equilibrium method. Based on the solubility data, the phase diagram of the system was obtained, which comprises two invariant points E and F and five uninvariant curves E3E, E4E, E1F, E2F and EF. The four stationary phases in crystallization regions are K₂CO₃·3/2H₂O, Na₂CO₃·10H₂O, NaKCO₃·6H₂O and Li₂CO₃. The composition of the solution corresponding to E is ω(K₂CO₃)=51.34%, ω(Na₂CO₃)=2.94%, ω(Li₂CO₃)=0.21% and the equilibrium solids are K₂CO₃· 3/2H₂O+NaKCO₃·6H₂O+Li₂CO₃. The composition of the solution for F is ω(K₂CO₃)=15.19%, ω(Na₂CO₃)=13.62%, ω(Li₂CO₃)=0.70% and the equilibrium solids are Na₂CO₃· 10H₂O+NaKCO₃·6H₂O+Li₂CO₃. Potassium carbonate has strong salting-out effect on Na₂CO₃ and Li₂CO₃. The physico-chemical properties of the system have been discussed briefly.
- salt-water system,
- phase equilibrium,
- alkali-metal carbonate,
- solubility,
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A Study on the Phase Equilibrium of the Quaternary System K₂CO₃-Na₂CO₃-Li₂CO₃-H₂O at 288 K