Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Sulfur or sulfur containing component
Reexamination Certificate
2005-11-08
2005-11-08
Cooke, Colleen P. (Department: 1754)
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Sulfur or sulfur containing component
C423S574100
Reexamination Certificate
active
06962680
ABSTRACT:
A method for removing sulfur compounds including transferring the impurity gas to a concentration process in which the impurity gas is separated into a concentrated gas containing hydrogen sulfide and a residual gas containing carbon dioxide, mercaptans and aromatic hydrocarbons: transferring the concentrated gas to a Claus reaction process in which hydrogen sulfide is recovered as an elementary sulfur, and an off-gas discharged from the Claus reaction process is heated to a temperature between the discharge temperature and 700° C.; introducing the heated off-gas into a mixing unit provided downstream of the heating means to be mixed with the residual gas; transferring a resultant mixed gas to a hydrogenation reaction process in which sulfur compounds are converted into hydrogen sulfide under the presence of a reduction catalyst; and separating the converted hydrogen sulfide and returning the separated hydrogen sulfide to the Claus reaction process.
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Machine Translation of JP 08-290904 (corresponding original foreign document cited on PTO-1449).
Machine Translation of JP 09-255974 (corresponding original foreign document cited on PTO-1449).
Machine Translation of JP 10-028837 (corresponding original foreign document cited on PTO-1449).
Ishigaki Shinya
Kida Mitsuru
Sasaki Takashi
Cooke Colleen P.
Darby & Darby
JGC Corporation
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