PROCESS FOR THE REOXIDATION, WITHOUT THE FORMATION OF NITROGEN OXIDES, OF FERROUS SOLUTIONS COMING FROM THE REMOVAL PROCESS IN CONTINUOUS OF HYDROGEN SULFIDE FROM GASEOUS STREAMS BY MEANS OF THE REDOX METHOD

摘要

Process for the reoxidation, without the formation of ni¬ trogen oxides, of ferrous solutions used in the removal process in continuous of hydrogen sulfide from gaseous streams containing them, comprising: a) putting a gas containing H?S in contact with an oxidiz¬ ing acid aqueous solution of ferric nitrate and containing a heteropolyacid having rjedox properties; b) filtrating and separating the sulfur produced; c) reoxidizing the ferrous nitrate to ferric nitrate with air as such or enriched in oxygen at a pressure higher than atmospheric pressure; d) recycling the solution containing ferric nitrate and the heteropolyacid to the oxidation step (a); and e) discharging the air.