Process for removing sulfur compounds out of a gas
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United States of America Patent
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Sep 5, 2000
Grant Date -
N/A
app pub date -
Dec 16, 1998
filing date -
Apr 24, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for removing the sulphur compounds H.sub.2 S, SO.sub.2 and at least one of COS and CS.sub.2 contained in a waste gas is provided. In this method, the waste gas is catalytically hydrolyzed to form a hydrolyzed gas containing H.sub.2 S and SO.sub.2, which is free of COS and CS.sub.2. After cooling, the hydrolyzed gas is introduced in one of two Claus catalytic zones mounted in parallel, while the other catalytic zone is regenerated and cooled. The regeneration is carried out with a gas stream drawn from the hydrolyzed gas before it is cooled, the regeneration gas effluent from the Claus catalytic zone is re-injected into the hydrolyzed gas between the drawing of the regeneration gas stream and the cooling of the hydrolyzed gas. The cooling of the Claus catalytic zones is carried out with a portion of unhydrolyzed gas drawn from the waste gas, the cooling gas effluent from the Claus catalytic zone is re-introduced into the waste gas between the drawing of the unhydrolyzed gas portion and a heating of the waste gas before hydrolysis.
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