Process for removing SO.sub.2 from gases which contain it, with

Details Process for removing SO.sub.2 from gases which contain it, with Process for removing SO.sub.2 from gases which contain it, with

1996-02-21

1997-04-08

Straub, Gary P.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Sulfur or sulfur containing component

4235663, 423571, 4235742, B01D 5350

Patent

active

056185073

ABSTRACT:
A wet process of regenerative type for removing SO.sub.2 contained in combustion gases in which SO.sub.2 is caused to be absorbed by a diluted aqueous solution of BaS, with a mixed precipitate of elemental S, BaSO.sub.3 and BaSO.sub.4 being formed by the consequent reactions. Sulfur is extracted from the precipitate--recovered by filtration--by using a solution of (NH.sub.4).sub.2 S; the resulting polysulfide is distilled, with pure elemental S and the solution of (NH.sub.4).sub.2 S to be recycled, being obtained. The residual mixture of BaSO.sub.3 and BaSO.sub.4 remaining after sulfur extraction is reduced with coal in a high temperature furnace, in order to obtain BaS to be recycled, as an aqueous solution, to the SO.sub.2 absorption step.

REFERENCES:
patent: 3784680 (1974-01-01), Strong et al.
patent: 4078048 (1978-03-01), Nadkami
patent: 4100260 (1978-07-01), Elston
patent: 4937057 (1990-06-01), Talonen et al.

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