ES428840A1 - Procedure for deodorizing waste gases. (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Procedure for deodorizing the waste gases, preferably those containing CO2, in at least two washing stages, with the contribution of active chlorine, according to the method that comprises subjecting, in a first stage of washing with chlorine, a stream of the residual gas that it has to be deodorized to the action of a washing liquid that contains active chlorine and, in a subsequent chlorine wash, to the action of a washing liquid that also contains active chlorine, but with an alkaline pH, characterized in that: a) the waste gases are treated by washing with an active chlorine-bearing washing liquid practically free of chlorine peroxide, b) in at least one of the washing steps, a content of at least 0.02 g of active chlorine per liter of washing liquid is maintained, c) in the first of the washing stages run by the residual gases, the pH of the washing liquid is kept between 4 and 9, d) in the following washing stage, the pH of the washing liquid is kept between 7 and 11, and in the following washing stage, at 0.3 to 4 above the pH of the first stage, and e) in a consecutive washing step, active alkali is added in an amount approximately stoichiometric with respect to the active chlorine supplied in total. (Machine-translation by Google Translate, not legally binding)