GAS-LIQUID EQUILIBRIA IN THE SYSTEM SO2-AQUEOUS SOLUTIONS OF NAHSO3/NA2SO3/NA2SO4

摘要

Using two independent measurement techniques the gas-liquid equilibria in the system sulphur dioxide-aqueous solutions of sodium sulphites are determined for the range of temperatures 308-373 K and concentrations of sodium ions 1.1-5.8 mol/kg of H2O. The effect of sodium sulphate on partial pressures of SO2 over the sodium sulphite-bisulphite solutions is evaluated at the ratios of the inactive (i.e. originating from sulphates) to active (originating from sulphites) sodium ions covering the range of 0.08-0.16. A correlation equation is derived which relates partial pressures of SO2 to the composition of the liquid phase and temperature. The results obtained differ from those presented by Johnstone et al. The correlations can be employed in the design and optimization calculations of chemical plants. [References: 17]