Process for the desulfurization of sulfur dioxide-containing gases
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United States of America Patent
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Feb 29, 2000
Issued Date -
N/A
app pub date -
May 10, 1994
filing date -
May 7, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The process of invention provides a simplified conversion of sulfur dioxide gas into hydrogen sulfide gas. First, sulfur dioxide gas is absorbed into an aqueous sulfide solution to form sulfite and bisulfide ions. Second, additional sulfur dioxide gas is absorbed into the aqueous solution to form hydrogen sulfide. Third, another portion of the sulfur dioxide is absorbed and reacts in the aqueous solution to form bisulfite. Most advantageously, the bisulfite is decomposed into sulfur dioxide and sulfite. The sulfite is then reduced to sulfide and returned for use in the absorption process. The hydrogen sulfide may then be reacted with SO.sub.2 via the Claus reaction to form elemental sulfur.
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