Methods and apparatus for sulfur recovery from acid gases
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United States of America Patent
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May 21, 2013
Grant Date -
Nov 3, 2011
app pub date -
Apr 30, 2010
filing date -
Apr 30, 2010
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Abstract
Apparatus and methods for recovering sulfur from acid gases. Acid gases containing relatively high amounts of carbonyl sulfide and/or one or more types of mercaptans can be treated in a sulfur recovery system employing an acid gas enrichment zone and a tail gas treatment zone, where partially-loaded sulfur absorbing solvent from the tail gas treatment zone is employed for sulfur absorption in the acid gas enrichment zone. Off-gas from the acid gas enrichment zone can be combined and hydrogenated with a sulfur recovery unit tail gas thereby increasing the total amount of sulfur recovery from the initial acid gas.
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