Method of whitening lignin-containing pulp during manufacture

Details Method of whitening lignin-containing pulp during manufacture Method of whitening lignin-containing pulp during manufacture

D - Textiles, Paper

21

H

D21H 21/30 (2006.01) D21C 9/00 (2006.01) D21C 9/10 (2006.01)

Patent

CA 2245966

A process to increase the whiteness of a lignin-containing pulp is disclosed which comprises adding to an aqueous slurry comprising a lignin-containing pulp, during pulp manufacture, a fluorescent whitening agent and optionally a chelating agent.

Cette invention concerne un procédé destiné à aviver la blancheur des pâtes renfermant de la lignine par ajout à une suspension aqueuse renfermant de la lignine, en cours de fabrication de la pâte à papier, d'un agent de blanchiment fluorescent et, facultativement, d'un chélateur.

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