SO₂ Solubility in 50 wt % H₂SO₄ at Elevated Temperatures and Pressures

Abstract

The SO 2 solubility at various temperatures and pressures was evaluated to determine the SO 2 content in a 50 wt % H 2 SO 4 acid solution adding new experimental solubility data for the SO 2 −H 2 SO 4 binary system currently available in literature. A setup was designed and commissioned to measure the SO 2 solubility at temperatures ranging from 30 °C to 80 °C and pressures up to 1000 kPa in 50 wt % H 2 SO 4 . SO 2 solubility measurements in water were used to benchmark the accuracy of the setup. According to the results, the solubility of SO 2 in 50 wt % H 2 SO 4 decreased with increasing temperature despite the increase in the system pressure found at higher temperatures. The highest amount of SO 2 soluble in 50 wt % H 2 SO 4 was attained at 30 °C and 3.658 kPa with 13.11 g of SO 2 per 100 g of H 2 SO 4 solution. A heat of solution of −36 kJ•mol −1 (uncertainty u(ΔH) = 5 kJ•mol −1 ) was determined.

Various operating methods and parameters for SO2 electrolysis

“…This was however not the case when the SO 2 was dissolved in H 2 SO 4 , which can probably be ascribed to the solubility of SO 2 in H 2 SO 4 . It has been shown [28,29] that the solubility of SO 2 gas in 30 wt% decreases with increasing temperature at a constant pressure thereby reducing the amount of SO 2 gas available for the reaction resulting in an increased operating voltage. The presence of the relatively high over potential (compared to using SO 2 anode feed -see Fig.…”

Vapor–Liquid Equilibrium of Ethanol + Sulfur Dioxide and Ethanol + Water + Sulfur Dioxide at Six Temperatures

“…The binary SO 2 and water high-pressure VLE was measured at temperatures from 293.15 to 413.15 K by Rumpf and Maurer and from 298 to 573 K by Spall but presented only graphically. Atmospheric pressure VLE was measured at 303.15 and 353.15 K by Rabe and Harris and from 283.15 to 313.15 K by Tokunaga, and solubility of SO 2 in water was measured at the temperature from 293.15 to 308.15 K by Li et al, from 296.39 to 386.18 K by Beuschlein and Simenson, from 293.19 to 299.79 K by Parkison, from 293.15 to 308.15 K by Li et al, and at 313.15 K by Kruger et al The literature data of binary VLE of ethanol and water selected in this work were measured by Kurihara et al, Arango and Villa, and Herraiz et al …”

Equilibrium Solubility of Sodium 1-Naphthalenesulfonate in Binary NaCl + Water, Na2SO4 + Water, and C2H5OH + Water Solvent Mixtures from (278.15 to 323.15) K

“…The results of solubility data of sodium 1-naphthalenesulfonate in binary NaCl + water, Na 2 SO 4 + water, and C 2 H 5 OH + water solvent mixtures is enormous significance to the crystallization process. But so far, there has been no literature reporting on the solubility of sodium 1-naphthalenesulfonate. − So this work focuses on a systematic measurement of the solubility of sodium 1-naphthalenesulfonate in binary NaCl + water, Na 2 SO 4 + water, and C 2 H 5 OH + water solvent mixtures was determined by steady-state method from (278.15 to 323.15) K. − The experimental data were correlated by a modified Apelblat equation.…”