Solubility and Solid-Phase Composition in Na2CO3-Na2SO4 Solutions at Boiling Temperature: A Modeling Approach
Artikel i vetenskaplig tidskrift, 2008

Scaling caused by Na2CO3-Na2SO4 double salts constitutes a severe problem in black liquor evaporators. The ability to predict the solubility and solid-phase composition of these species would be conclusive in minimizing the adverse effects of scaling. Experimental solubility data for (sodium sulfate) dicarbonate, a carbonate-rich double salt identified in Na2CO3-Na2SO4 precipitates, were generated and used for fitting an empirical solubility model. A thermodynamically based approach for predicting the solubility and solidphase composition, previously used for burkeite precipitates, was applied to solid solutions of dicarbonate.


double salt


(sodium sulfate) dicarbonate

sodium carbonate

solid solution

sodium sulfate


Marta Anna Bialik

Chalmers, Kemi- och bioteknik, Skogsindustriell kemiteknik

Hans Theliander

Chalmers, Kemi- och bioteknik, Skogsindustriell kemiteknik

Maria Sedin

Chalmers, Kemi- och bioteknik, Skogsindustriell kemiteknik

Christopher L Verrill

Nikolai DeMartini

Institute of Paper Science and Technology

Industrial & Engineering Chemistry Research

0888-5885 (ISSN) 1520-5045 (eISSN)

Vol. 47 9 3233-3238