Chemistry of inorganic compounds – Sulfur or compound thereof – Elemental sulfur
Reexamination Certificate
2003-12-04
2008-10-21
Vanoy, Timothy C (Department: 1793)
Chemistry of inorganic compounds
Sulfur or compound thereof
Elemental sulfur
C423S576400, C423S576500, C423SDIG017
Reexamination Certificate
active
07438886
ABSTRACT:
The present application relates to a process for removing hydrogen sulfide H2S from a gas (1) by contacting said gas with a liquid solution (2) containing ferric sulfate in an absorption column (RC). Ferric sulfate and H2S react at room temperature and at a pressure ranging from 1 to 1.2 atm. Ferric ions being reduced to two-valent iron and sulfide oxidised to elemental sulfur. The liquid (4) coming out of the absorption column is filtered in two steps, the retentate (6, 8) comprising elemental sulfur, the filtrate (5, 7) containing the iron ions. The filtrate is sent to a bioreactor (RB) for regeneration, i.e. oxidation of iron to Fe3+by means ofthiobacillus ferroxidansand air injection (10). The regenerated solution is reused in the absorption column (RC). The process faces the problems relating to the alignment between the chemical step and the biological step in order to obtain a process which can stably run continuously.
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Barberini Umberto
Crescenzi Francesco
Gianna Roberto
Robertiello Andrea
Valdiserri Mario Galileo
Enitechnologie S.p.A.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Vanoy Timothy C
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