Enitechnologie S.p.a.

Mario Galileo Valdiserri

Andrea Robertiello

Roberto Gianna

Francesco Crescenzi

Umberto Barberini

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.

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Rome, Italy

Mario Galileo Valdiserri