Abstract
AbstractA thermodynamics solution model has been developed for concentrated trona brines over temperatures ranging from about 0°C to 200°C. The model was constructed by regressing on solubility data for the temperature‐dependent parameters in Pitzer's activity coefficient model. In addition, the model incorporates published thermochemical data for the solid salts and aqueous species. In some cases it was necessary to estimate solid salt heat capacities, but otherwise no adjustments were made in the thermochemical parameters. With one exception, the model provided an excellent fit to the data. The existence of a high‐temperature trona phase reported earlier cannot be reconciled with the model and is believed to be in error. The phase‐equilibrium diagram generated by the model appears suitable for design purposes.
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