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Solubility of Sulfur Dioxide in Sulfuric Acid of High Concentration

1998; American Chemical Society; Volume: 37; Issue: 3 Linguagem: Inglês

10.1021/ie9706119

1520-5045

Qinglin Zhang, Hui Wang, I. G. Dalla Lana, Karl T. Chuang,

Phase Equilibria and Thermodynamics

The solubility of sulfur dioxide (SO2) in concentrated aqueous sulfuric acid (60−96 wt %) was measured at different SO2 partial pressures and at temperatures of 298, 383, and 393 K. A correlation is derived relating the SO2 solubility in aqueous sulfuric acid solution with different SO2 partial pressures. Further simplifications for high concentrations of the sulfuric acid solution allow the direct determination of a Henry's law constant and its dependence on temperature using the measured solubility data and the correlation. A comparison of the correlation with limited literature data is also presented. The correlation well represents both the experimental data of this work and the data reported in the literature. The overall heats of solution of SO2 in 79.01 and 95.91 wt % sulfuric acid solutions were also estimated using a van't Hoff type dependence of Henry's law constant on temperature.