Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Carbon dioxide or hydrogen sulfide component
Reexamination Certificate
2006-08-31
2009-10-27
Marcheschi, Michael A (Department: 1793)
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Carbon dioxide or hydrogen sulfide component
C423S210000, C423S220000, C423S573100, C423S576400, C423S576500
Reexamination Certificate
active
07608231
ABSTRACT:
Process for the removal in continuous of hydrogen sulfide from gaseous streams containing it, comprising: a) putting a gas containing H2S in contact with an oxidizing acid aqueous solution of ferric nitrate and containing a heteropolyacid having redox properties; b) filtrating and separating the sulfur produced by the redox reaction; c) oxidizing the ferrous nitrate to ferric nitrate with air; d) recycling the solution containing ferric nitrate and heteropolyacid to the oxidation step (a); e) subjecting the gaseous stream leaving the oxidation reactor (c) to washing with the reduced solution; and f) discharging the gaseous stream.
REFERENCES:
patent: 2007/0178033 (2007-08-01), De Angelis et al.
patent: 2008/0207951 (2008-08-01), De Angelis et al.
patent: 2005 075351 (2005-08-01), None
patent: WO 2005/075351 (2005-08-01), None
Bellussi Giuseppe
De Angelis Alberto
Milli Marcello
Pollesel Paolo
ENI S.p.A.
Marcheschi Michael A
Micali Joseph V
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
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