ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Liquid-solid equilibrium for the NaCl-NaHCO₃-Na₂CO₃-H₂O system at 45°C. Validation of mixed solvent electrolyte model

Zdzisław Jaworski and Małgorzata Czernuszewicz

Department of Chemical Engineering, West Pomeranian University of Technology, Szczecin, Al. Piastów 42, 71 - 065, Szczecin, Poland

E-mail: Zdzislaw.Jaworski@zut.edu.pl

Abstract: The main objective of this work was to verify the mixed solvent electrolyte (MSE) thermodynamic model for the prediction of the liquid-solid equilibrium in the soda system. The full quaternary system NaCl-NaHCO₃-Na₂CO₃-H₂O and its three subsystems were considered. Validation of the thermodynamic model was based on experimental data from literature. Phase diagrams for the soda system are plotted for isotherms of 45°C. Good agreement of the MSE results with those from experiments was found at 45°C. Similar phase diagrams for other temperature levels can be constructed based on the validated MSE model.

Keywords: soda system – solubility diagram – MSE model – validation

Full paper is available at www.springerlink.com.

DOI: 10.2478/s11696-013-0364-2

Chemical Papers 67 (9) 1181–1187 (2013)