Method for acidification of soap with sodium bisulphite...

C - Chemistry – Metallurgy – 11 – B

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C11B 13/02 (2006.01) D21C 11/00 (2006.01) D21C 11/04 (2006.01) D21C 11/06 (2006.01)

Patent

CA 2148232

The invention relates to acidification of soap, wherein the acidification is performed with a sodium bisulphite solution produced by absorbing the SO2 entrained in the flue gases obtained from the combustion of odour gases derived from a chemical pulp mill into an alkaline sodium solution which is NaOH or oxidized white liquor, or which is NaHSO3-containing mother liquid obtained from SO2 or NaHSO3 acidification of soap. The acidification can be conducted in one or more steps and by the cross-current and/or counter-current method by recycling the Na2SO3 mother liquid obtained from the acidification.

L'invention se rapporte à l'acidification de savon, cette acidification étant effectuée au moyen d'une solution de bisulfite de sodium qu'on produit en absorbant le SO2 entraîné dans les gaz de fumée dus à la combustion des gaz odorants dérivés d'une installation de traitement de pâte chimique, le SO2 absorbé se transformant en une solution de sodium alcalin qui est constituée d'une liqueur blanche oxydée ou de NaOH ou qui est constituée par une eau-mère contenant du NaHSO3 obtenue à partir de l'acidification de savon par SO2 ou par NaHSO3. Cette opération d'acidification peut être effectuée en une ou plusieurs étapes et par la technique à courant transversal et/ou à contre-courant par recyclage de l'eau-mère au Na2SO3 obtenue à partir de l'acidification.

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