Patent ID: 9248396
Filing Date: 2016-02-02
CPC Classification: B01D,B01J,C25C

Claim Text:
1. A method of capturing SO2 present in gases originating from cells for the industrial production of aluminium by igneous electrolysis, comprising the steps of: injecting a sorption agent into a gas stream of gases originating from cells for the industrial production of aluminium by igneous electrolysis, the gas stream with the sorption agent passing into and then through a group of at least two reactors, the gas stream passing being passed through the group of at least two reactors in a parallel manner with a first part of the gas stream containing the sorption agent passing through a first reactor of the group of at least two reactors at a same time as a second part of the gas stream containing the sorption agent is passed through a second reactor of the group of at least two reactors, wherein the sorption agent is a powder material, wherein in passing the gas stream through the first and second reactors, the sorption agent in the first and second parts of the gas stream adsorb effluents present in said gas stream; after the sorption agent has adsorbed the effluents, using a collecting means, collecting said sorption agent in the first and second parts of the gas stream and, using a discharge means, discharging the collected sorption agent to a SO2 desorption unit; using the SO2 desorbing unit, desorbing SO2 in collected sorption agent to form fresh sorption agent; via an injecting means, injecting the fresh sorption agent into a third part of part of the gas stream passing into and through at least a third one of said reactors.