Process for the removal of chlorine from off-gases

Details Process for the removal of chlorine from off-gases Process for the removal of chlorine from off-gases

C - Chemistry, Metallurgy

01

G

53/156, 23/257,

C01G 23/07 (2006.01) B01D 53/14 (2006.01) B01D 53/68 (2006.01) C22B 34/12 (2006.01)

Patent

CA 2013624

The invention relates to a process for the removal of chlorine from off-gases which continuously or sporadically contain small amounts of chlorine, through scrubbing them with a ferrous chloride-containing aqueous solution in a scrubbing system. The solution used is obtained in dissolving a solids mixture which results from the chlorination of a titaniferous and ferriferous feedstock material and essentially contains-ferrous chloride. This solution is used in particular for the scrubbing of off-gases formed in the production of titanium dioxide by the chlorination of titaniferous and ferriferous feedstock material, thus generating titanium tetrachloride and ferrous chloride, and by the reaction of the titanium tetrachloride with oxygen-containing gases. It is preferably the solids mixture separated in this process from the chlorination mixture in a condensation step that is dissolved in the process of the invention, and at least part of the resulting solution is used for the scrubbing of the off-gas. Known devices can be used for scrubbing, e.g. packed columns.

Méthode pour éliminer le chlore dans les gaz d'échappement renfermant continuellement ou sporadiquement de petites quantités de chlore; elle consiste à les purifier à l'aide d'une solution aqueuse de chlorure ferreux dans un système d'épuration. La solution employée est obtenue par dissolution d'un mélange de solides, résultant de la chloration d'une alimentation titanifère et ferrifère; elle renferme principalement du chlorure ferreux. Cette solution sert notamment pour la purification des gaz libérés lors de la production de dioxyde de titane par chloration d'une l'alimentation titanifère et ferrifère, formant du tétrachlorure de titane et du chlorure ferreux, et par réaction du tétrachlorure de titane avec des gaz oxygénés. C'est de préférence le mélange de solides, séparé ici du mélange de chloration lors d'une étape de condensation, qui est dissous dans le procédé de l'invention, et au moins une partie de la solution résultante sert à purifier les gaz. Des dispositifs classiques, comme les colonnes garnies, peuvent servir au lavage.

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