Conversion of SO.sub.2 gaseous effluents into solutions of ammonium or alkali/alkaline earth metal bisulfites
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United States of America Patent
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Jan 14, 1997
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N/A
app pub date -
Mar 16, 1995
filing date -
Mar 16, 1994
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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.
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