Mutual solubility of NH4HCO3 and NaHCO3 in aqueous solutions over a temperature range 293 K to 323 K has been measured. On the basis of these results, a polytherm section for the NH4HCO3 + NaHCO3 + H2O system has been drawn. In addition, a correlation between the solution densities and both salt concentrations has been found.

The solubilities of ammonium vanadate and ammonium nitrate in the NH4VO3−NH4NO3−H2O system were investigated at 293, 303, 313, and 323 K by the method of isothermal saturation of solutions. A section of the solubility isotherm for the investigated system was plotted based on the obtained data. Knowledge of that dependence is necessary for developing the new method of using the postfiltration liquor from the soda−chlorine−saltpeter (SCS) method of sodium carbonate production, based on an equilibrium plot for the quaternary system of pairs of the exchange salts NH4NO3−NaVO3−H2O.

The mutual solubility of salts in the ternary system NH4NO3 + NaNO3 + H2O was investigated in the temperature range 293−323 K by the method of isothermal saturation of solutions. The data obtained were used for plotting the section of the solubility polytherm for the system investigated. Knowledge of the course of the solubility polytherm is necessary for developing a new method of utilization of the post-filtration lye from the soda−chlorine−saltpeter method (SCS) of soda production.

The influence of temperature, time, and excess of KCl in a reaction mixture on the yield of KVO3 synthesis based on KCl and V2O5 in the presence of steam was determined. The reaction temperature was varied between 673 and 823K, and the time ranged from 4 to 6 h. The required optimum excess of KCl in the reaction mixture and time of processing were identified. The results are implemented in a database to determine an alternative, nonwaste method of potassium carbonate production.

No abstract