Dilute SO2 Absorption Equilibria in Aqueous HCl and NaCl Solutions at 298.15 KClick to copy article linkArticle link copied!
Abstract
The solubility of dilute SO2 in aqueous HCl and NaCl solutions was determined at 298.15 K as a function of ionic strength up to 3 mol·L-1, in the partial pressure range between (0.075 and 1.8) kPa. Measurements were carried out by a saturation method using a laboratory batch reactor. Equations to correlate the apparent Henry's law constant, Hm, and the apparent first dissociation constant, Km1, were obtained as a function of ionic strength. Comparisons between experimental results and theoretical predictions were also made. A model based on the classical Sechenov equation was tested, and a new value for the SO2 gas-specific parameter was obtained to calculate Hm. Two different models were considered for calculating the activity coefficients to determine Km1. An extended version of the Debye−Hückel theory described the experimental results for ionic strengths below 0.1 mol·L-1. The Pitzer model was in good agreement with the experimental data in the ionic strength range between (0 and 3) mol·L-1. The close fit between measured and calculated data showed that the selected models can be successfully used for estimating the solubility of SO2 in salt solutions at low partial pressures.
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