Process for desulphurizing flue gases

Details Process for desulphurizing flue gases Process for desulphurizing flue gases

1985-09-12

1987-06-02

Doll, John

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Halogenous component

423522, 423531, B01D 5314, C01B 17775, C01B 1790

Patent

active

046702350

ABSTRACT:
In the desulphurizing of SO.sub.2 - and hydrogen halide-containing flue gases by catalytically oxidizing the sulphur dioxide on moist active carbon at a temperature of from 45.degree. to 70.degree. 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 the H.sub.2 SO.sub.4 concentration of from 40 to 70%.

REFERENCES:
patent: 940595 (1909-11-01), Herreshoff
patent: 1764593 (1930-06-01), Adamson
patent: 3862295 (1975-01-01), Tolles
patent: 3907970 (1975-09-01), Boening
patent: 4495162 (1985-01-01), Jons et al.

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