Process for the removal of SO 2 , HCN and H 2 S and...

Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Sulfur or sulfur containing component

Reexamination Certificate

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Details

C423S244010, C423S236000, C423S573100, C423SDIG017, C423S576800, C423S237000, C435S266000

Reexamination Certificate

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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.

REFERENCES:
patent: 5976868 (1999-11-01), Buisman
patent: 6107353 (2000-08-01), Koveal et al.
patent: 6156205 (2000-12-01), Buisman et al.
patent: 7485275 (2009-02-01), Asprion et al.
patent: 0140191 (1985-05-01), None
patent: 0324526 (1989-07-01), None
patent: 96/19281 (1996-06-01), None
patent: 98/07502 (1998-02-01), None
International Search Report dated Sep. 14, 2004.
Intl Preliminary Examination Report (PCT/EP2004/050955) dated Sep. 6, 2005.

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