Bipolar process for removal of sulfur dioxide from waste gases

C - Chemistry – Metallurgy – 25 – B

Patent

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Details

C25B 1/02 (2006.01) B01D 53/32 (2006.01) B01D 53/50 (2006.01) C25B 1/22 (2006.01)

Patent

CA 2163771

A process for removing sulfur dioxide (SO2) from a waste gas stream and recovering the sulfur values as sulfuric acid. The sources of the waste gas stream include effluent vent, flue or exhaust gases from power plants, sulfuric acid plants, ore roasters and solid waste incinerators. The gas is conducted through an apparatus having a column (10) containing a scrubbing packing material (20a) that is electrically conductive. Electrical contacts (32, 34) in contact with the packing material (20a) provide for the electrochemical reaction between the liquid phase and gas phase to absorb and react the SO2. The arrangement provides economy of operation, a useful byproduct and minimal environmental pollution.

Procédé d'extraction de dioxyde de soufre (SO2) d'un courant de gaz de combustion, et de récupération des valeurs sulfurées sous forme d'acide sulfurique. Les sources du courant de gaz de combustion sont par exemple des gaz d'échappement, des gaz brûlés et des effluents gazeux provenant de centrales de production d'énergie, d'installations de production d'acide sulfurique, d'installations de grillage de minerais et d'incinérateurs de déchets solides. Le gaz est conduit à travers un dispositif comprenant une colonne (10) contenant un matériau (20a) de remplissage et de lavage électroconducteur. Des contacts électriques (32, 34) mis en contact avec le matériau de remplissage (20a) produisent une réaction électrochimique entre la phase liquide et la phase gazeuse afin d'absorber et de faire réagir le SO2. L'agencement permet d'obtenir un fonctionnement économique, un sous-produit utile et une pollution environnementale minimale.

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