Beenackers, A.A C M

Dagaonkar, M.V.

Pangarkar, V.G.

Chemical absorption of pure SO2 into aqueous slurries of fine and reactive Ca(OH)2 and Mg(OH)2 was studied in a stirred vessel at at realistically high mass transfer coefficients. The absorption process was theoretically analyzed using two different models. For the SO2–Ca(OH)2 system, a single-reaction plane model was used and for the SO2–Mg(OH)2 system, a two-reaction plane model incorporating the solids dissolution promoted by the reactions with the absorbed SO2 in the liquid film was employed. A correct procedure was adopted to estimate the contribution of the suspended particles to the enhancement of gas absorption. Theoretical enhancement factors thus obtained compared well with the experimental data. The extra enhancement observed for the SO2–Mg(OH)2 system could be explained from the reaction between SO2 and the dissolved [SO3]2−

Absorption of sulfur dioxide into aqueous reactive slurries of calcium and magnesium hydroxide in a stirred cell

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