Process for bleaching
AssigneeEka Nobel AB
InventorInge Mansson
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Abstract
Process for bleaching of materials, at which an aqueous solution of borohydride containing borohydride corresponding to from 15 to 35 percent by weight of sodium borohydride and hydroxylic ions corresponding to not more than 10 percent by weight of NaOH is brought to react with a bisulfite solution, after which the dithionite solution thus obtained is added to the material to be treated. This process gives a simple and economic preparation of dithionite bleaching solution in situ, in connection with the bleaching.
Claims16
Process for bleaching of materials with a dithionite solution, characterised in that an aqueous borohydride solution containing borohydride corresponding to from 15 to 35 percent by weight of sodium borohydride and containing hydroxylic ions corresponding to not more than 10 percent by weight of NaOH is brought to react with a bisulfite solution, after which the dithionite solution thus obtained is added to the material to be treated.
Dependencies are inferred from the claim text.