Process for the removal of so2 from gases of air

Details Process for the removal of so2 from gases of air Process for the removal of so2 from gases of air

B - Operations, Transporting

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B01D 53/34 (2006.01) B01D 53/14 (2006.01)

Patent

CA 1050734

ABSTRACT OF THE DISCLOSURE The disclosure describes a process for removal of sulphur dioxide from an effluent gas by treating the gas in at least two successive stages with an absorbing solution selected from the group consisting of an alkali sulphite solution and an alkali sulphite and bisulphite solution. Part of the absorbing solution has been pretreated with air or with a gas that is inert with respect to the solution to reduce the SO2 partial pressure of the absorbing solution. The pretreatment of part of the absorbing solution is accomplished as a partial solution regeneration step in a cyclic process in which the pretreated absorbing solution is repeatedly circulated through an absorption stage and a regeneration stage, SO2 absorbed by the solution in the absorption stage being partially stripped from the solution in the regeneration stage and reabsorbed by the solution concurrently with the absorption by the solution of SO2 from the SO2 - containing gas, whereby the SO2 content in the effluent gas is reduced to 50 ppm or less.

219046

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