Abstract
This study investigates the effect of sulfur dioxide (SO 2) on the removal of carbon dioxide (CO 2) from a typical power station flue gas stream using an aqueous potassium carbonate (K 2CO 3) solvent. The influence of SO 2 on the solubility of CO 2 into a 30 wt% K 2CO 3 solution was measured using a dynamic vapour–liquid equilibrium apparatus at temperatures of 90 °C and 100 °C. The study was conducted at various loadings (moles CO 2 absorbed/moles K 2CO 3) at atmospheric pressure using N 2 as the carrier gas. It was found that SO 2 preferentially reacts with K 2CO 3, displacing an equivalent molal quantity of CO 2 into the vapor phase. An experimental analysis of the absorbed SO 2 in the K 2CO 3 solution showed that sulfite was the major species present. Further analysis showed that the absorption of SO 2 into K 2CO 3 solutions is a non-reversible reaction at 100 °C and hence sulfur would accumulate in the solvent and consequently over time reduce the capacity of the solvent to absorb CO 2.
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