Method of bleaching paper pulp

Details Method of bleaching paper pulp Method of bleaching paper pulp

D - Textiles, Paper

21

C

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

Patent

CA 2098661

Paper pulp, especially recycled paper pulp which has been deinked, is bleached in a synergistic two-stage process first with sodium bisulfite and then with sodium borohydride. The borohydride is preferably added in an aqueous mixture with sodium hydroxide. A weak acid such as acetic acid may be added to the pulp to advance further the brightness gain.

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