Manganic ion bleaching process

Details Manganic ion bleaching process Manganic ion bleaching process

D - Textiles, Paper

21

C

8/78.1, 9/16.5

D21C 9/10 (2006.01)

Patent

CA 1079457

MANGANIC ION BLEACHING PROCESS Abstract of the Disclosure A process for delignifying lignocellulosic pulps, which comprises the steps of (a) impregnating a lignocellulosic pulp slurry with a water-soluble manganous salt having a manganous ion concentration of from about 1% to about 10%, by weight of oven- dried pulp; (b) mixing the impregnated pulp slurry with suf- ficient alkali to precipitate the soluble manganous ion as insol- uble manganous hydroxide; (c) contacting the pulp slurry with an oxygen-containing gas for a period of time sufficient to oxid- ize substantially all of the manganous hydroxide to manganic hydroxide; (d) treating the pulp slurry with sufficient acid to lower the slurry pH to at least about 3, thus releasing soluble manganic ions to oxidize the pulp lignins; (e) separating the effluent containing manganous ions from the pulp slurry with a non-alkaline wash; and then (f) extracting the oxidized lignins from the pulp slurry with an alkaline solution.

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