Process for the purification of flue and other waste gas

Details Process for the purification of flue and other waste gas Process for the purification of flue and other waste gas

1975-08-22

1978-03-21

Vertiz, O. R.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Sulfur or sulfur containing component

423243, 423166, C01B 1700, C01F 140

Patent

active

040804283

ABSTRACT:
The invention is concerned with improved process and apparatus for the removal of sulphur dioxide from flue gas or other waste gas of the kind in which the waste gas is scrubbed by a circulating wash liquid containing lime suspensions, i.e. suspensions of calcium oxide, hydroxide or carbonate, the calcium/sulphur compounds so formed being oxidized and removed from the circulation, the improvements of the present invention comprising primarily the freeing of the wash liquid from solid matter before contact with the waste gas and then the control of pH values of the wash liquid at different stages of the circulation to facilitate, for example, the oxidation of the particular calcium/sulphur compound, formed in the scrubbing process, to calcium sulphate, the apparatus also being designed to improve the oxidation step.

REFERENCES:
patent: 2021548 (1935-11-01), Goodeve
patent: 2021936 (1935-11-01), Johnstone
patent: 3556722 (1971-01-01), Owati
patent: 3632306 (1972-01-01), Villiers-Fisher et al.
patent: 3808321 (1974-04-01), Fukui et al.
patent: 3876750 (1975-04-01), Hauser
patent: 3920794 (1975-11-01), La Mantia et al.

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