Abstract
A novel absorbent sodium lactate (NaLa) aqueous solution (aq) for SO2 absorption is reported. SO2 in simulated flue gas is reversibly absorbed in NaLa aq. The absorption capacity of SO2 in the absorbent increases with increasing NaLa content and SO2 concentration, and decreasing temperature. Compared with the absorbents reported in the literature, the absorption capacity of SO2 in NaLa aq. is much high, for example, 50 wt % NaLa aqueous solution can absorb 0.130 g SO2 / g absorbent at a SO2 concentration of 2.5 vol % and 40 oC. Importantly, NaLa (aq) exhibits high reversibility and long-term stability, indicating a promise for the desulfurization of flue gas. The absorption mechanism is proposed to be the replacement of lactic acid (HLa) by sulfurous acid (H2SO3), which is generated by dissolving SO2 in water.
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