Absorption of Dilute Sulfur Dioxide in Aqueous Poly-Ethylene Glycol 200 Solutions at 298.15 K and 122.60 kPa

Abstract

In present work, isothermal gas-liquid equilibrium (GLE) data are measured for the absorption of dilute SO₂ in various aqueous poly-ethylene glycol 200 (PEG) solutions at 298.15 K and 122.60 kPa and SO₂ partial pressures in the range of (0.8-127) Pa. Measurements were carried out by a saturation method using a glass absorption apparatus, which were controlled at constant temperature using a thermostatic circulation bath with a Beckmann thermometer. The gas-liquid equilibrium data were measured with relative uncertainties within ± 0.02 K for temperature, ± 0.133 kPa for total pressures, ± 0.6 % for SO₂ concentration in the liquid phase and ± 3.5 % for SO₂ volume fraction in the gas phase. The measurement showed that the solubility of SO₂ in the system PEG (1) + water (2) increased with increasing PEG concentration in the mass fraction range of w₁ = (0.60-1.00) and the solubility of SO₂ in the PEG (1) + water (2) system presented a minimum at the mass fraction of w₁ = 0.60 of 101 mg dm^-3 when SO₂ in the gas phase is designed at F_SO2 = 5 × 10^-4. The peculiarity of this work is used to provide important gas-liquid equilibrium data for the design and operation of the absorption and desorption processes in flue gas desulfurization with potential industrial application of various aqueous solutions of poly-ethylene glycol 200.