Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Sulfur or sulfur containing component
Patent
1995-03-16
1997-01-14
Baxter, Janet C.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Sulfur or sulfur containing component
C01B 1700
Patent
active
055936512
ABSTRACT:
Gaseous effluents containing oxygen and no greater than 2% by volume of sulfur dioxide, SO.sub.2, for example those emanating from facilities for the industrial-scale production of sulfuric acid, are converted into useful solutions of ammonium or of alkali or alkaline earth metal bisulfites, by first absorbing such gaseous effluent in a solution of ammonium or of an alkali or alkaline earth metal sulfite and bisulfite, at a pH ranging from 5 to 7, and, secondly, contacting the solution thus produced with an acidic reagent, advantageously a gaseous feedstream containing oxygen and greater than 2% by volume of sulfur dioxide, the O.sub.2 / SO.sub.2 ratio by volume thereof being less than 5.
REFERENCES:
patent: 3644087 (1972-02-01), Urban
patent: 4201755 (1980-05-01), Nofal
patent: 4834959 (1989-05-01), Kent et al.
Chane-Ching Jean-Yves
Hustache Gerard
Sabot Jean-Louis
Baxter Janet C.
Harding Amy M.
Rhone-Poulenc Chimie
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