Process for the removal in continuous of hydrogen sulfide...

C - Chemistry – Metallurgy – 10 – L

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C10L 3/10 (2006.01) B01D 53/14 (2006.01) B01D 53/52 (2006.01) C01B 17/05 (2006.01)

Patent

CA 2620241

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.

Cette invention concerne un procédé d'élimination en continu de sulfure d'hydrogène de courants gazeux contenant le sulfure d'hydrogène, lequel procédé consiste: a) à mettre un gaz contenant H2S en contact avec une solution aqueuse acide oxydante de nitrate ferrique et contenant un hétéropolyacide présentant des propriétés d'oxydoréduction; b) à filtrer et à séparer le soufre produit par la réaction d'oxydoréduction; c) à oxyder le nitrate ferreux en nitrate ferrique avec de l'air; d) à recycler la solution contenant le nitrate ferreux et l'hétéropolyacide vers l'étape d'oxydation (a); e) à soumettre le courant gazeux sortant du réacteur d'oxydation (c) à un rinçage avec la solution réduite; et f) à décharger le courant gazeux.

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