Process for desulphurizing flue gases

Details Process for desulphurizing flue gases Process for desulphurizing flue gases

C - Chemistry, Metallurgy

01

B

23/349

C01B 17/775 (2006.01) B01D 53/68 (2006.01) B01D 53/86 (2006.01)

Patent

CA 1245831

A process for desulphurizing flue gases ABSTRACT In the desulphurizing of SO2- and hydrogen halide- containing flue gases by catalytically oxidizing the sulphur dioxide on moist active carbon at a temperature of from 45 to 70°C with the formation of 3 to 20% dilute sulphuric acid, the improvement which comprises contacting the dilute sulphuric acid with the hot flue gases to be desulphurized so as to evaporate water resulting sulphuric acid of a concentration of from 60 to 85%, and removing by evaporation the hydrogen chloride and hydrogen fluoride dissolved in the dilute sulphuric acid. Advantageously evaporation is carried out in two scrubbing stages, the hydrogen chloride and hydrogen fluoride being removed, by vacuum evaporation or by stripping with air or flue gas, from a mixture of the dilute sulphuric acid from the second scrubbing stage with the concentrated sulphuric acid from the first scrubbing stage, the mixture having an H2SO4 concentration of from 40 to 70%.

491703

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