Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Sulfur or sulfur containing component
Reexamination Certificate
2004-05-28
2010-02-02
Vanoy, Timothy C (Department: 1793)
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Sulfur or sulfur containing component
C423S244010, C423S236000, C423S573100, C423SDIG017, C423S576800, C423S237000, C435S266000
Reexamination Certificate
active
07655205
ABSTRACT:
Disclosed is a process for the removal of sulfur from a gas stream containing sulfur dioxide, hydrogen cyanide and hydrogen sulfide. The process includes a hydrogenation step, a hydrolysis step, an ammonia removal step and a hydrogen sulfide removal step. An aqueous alkaline washing liquid is used in the hydrogen sulfide removal step and with the spent sulfide containing washing liquid being regenerated using an oxidation bioreactor that utilizes sulfide oxidizing bacteria such as autotropic aerobic cultures ofThiobacillusandThiomicrospira.
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International Search Report dated Sep. 14, 2004.
Intl Preliminary Examination Report (PCT/EP2004/050955) dated Sep. 6, 2005.
Kijlstra Wiebe Sjoerd
Roos Inge
Smit Cornelis Jacobus
Van Grinsven Petrus Franciscus Antonius
Shell Oil Company
Stewart Charles W.
Vanoy Timothy C
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