Process for removing sulfur dioxide contained in a gas

Details Process for removing sulfur dioxide contained in a gas Process for removing sulfur dioxide contained in a gas

1974-10-22

1976-08-10

Vertiz, Oscar R.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Sulfur or sulfur containing component

423356, 423155, 423539, C01B 1700

Patent

active

039742571

ABSTRACT:
A SO.sub.2 containing gas, for example a stack gas, is purified according to a multi-step process, which comprises washing said gas with an aqueous ammonia solution, treating the resulting solution with hydrochloric acid, whereby SO.sub.2 and an aqueous ammonium chloride solution are obtained and separated. The ammonium chloride solution is then reacted with magnesium oxide to recovery ammonia and the resulting magnesium chloride is cracked to produce hydrochloric acid and magnesium oxide, the ammonia, hydrochloric acid and magnesium oxide being recycled to the process.

REFERENCES:
patent: 3226192 (1965-12-01), Atsukawa et al.
patent: 3579296 (1971-05-01), Cann
patent: 3792153 (1974-02-01), Lynn et al.

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