The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 21, 2008
Filed:
Dec. 04, 2003
Roberto Gianna, Rome, IT;
Umberto Barberini, Rome, IT;
Mario Galileo Valdiserri, Rome, IT;
Francesco Crescenzi, Rome, IT;
Andrea Robertiello, Rome, IT;
Roberto Gianna, Rome, IT;
Umberto Barberini, Rome, IT;
Mario Galileo Valdiserri, Rome, IT;
Francesco Crescenzi, Rome, IT;
Andrea Robertiello, Rome, IT;
Enitechnologie S.p.A., San Donato Milanese, IT;
Abstract
The present application relates to a process for removing hydrogen sulfide HS from a gas () by contacting said gas with a liquid solution () containing ferric sulfate in an absorption column (RC). Ferric sulfate and HS 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 () coming out of the absorption column is filtered in two steps, the retentate () comprising elemental sulfur, the filtrate () containing the iron ions. The filtrate is sent to a bioreactor (RB) for regeneration, i.e. oxidation of iron to Feby means ofand air injection (). 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.