Bleaching of kraft pulp with hydrosulfite

Details Bleaching of kraft pulp with hydrosulfite Bleaching of kraft pulp with hydrosulfite

D - Textiles, Paper

21

C

D21C 9/10 (2006.01) D21C 5/02 (2006.01)

Patent

CA 2128814

ABSTRACT A method of strengthening oxidatively bleached kraft pulps (including recycled pulps) is taught wherein the pulp is treated with hydrosulfite, formamidine sulfinic acid or a selected sulfoxylate at specified pH, temperature and retention times. Further strengthening is obtained by the addition of a selected quaternary ammonium compound or alkoxylated amine.

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