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The separation of highly saline waters under various conditions is carried out using a nonconventional partial-desalting process. The method utilizes a series of chemical reactions involving the conversion of sodium chloride, the major constituent in saline waters, into sodium bicarbonate, which precipitates under the experimental conditions, and ammonium chloride, which can be separated by crystallization. Experiments of absorption of carbon dioxide in an ammoniated brine have demonstrated the efficiency of the method. Interpretations using conversion parameters such as temperature, initial concentrations of ammonia, sodium chloride, and the ratio of NH3/NaCl are discussed.

The reactions and equilibrium relationships underlying the absorption process of CO2 gas in ammoniated brine solutions as proposed in part 1 are described first. A numerical solution of a set of nonlinear equations developed in the form of an algorithm, to calculate the concentration of unreacted ammonia, is obtained next. Calculated values are compared with experimental data for the system under investigation. The instantaneous absorption rate is evaluated by using the approximate approach (film model) and the exact solution (penetration theory).