Pre-treatment of sulfite pulp before bleaching with oxygen...

Details Pre-treatment of sulfite pulp before bleaching with oxygen... Pre-treatment of sulfite pulp before bleaching with oxygen...

D - Textiles, Paper

21

C

D21C 9/00 (2006.01) D21C 1/06 (2006.01) D21C 1/08 (2006.01) D21C 9/147 (2006.01) D21C 9/16 (2006.01)

Patent

CA 2121969

This invention relates to the pre-treatment of sulfite pulp. More particularly, this invention relates to a novel process for caustic extraction of unbleached sulfite pulp to reduce metallic impurities in the pulp. The process of reducing metallic impurities in unbleached sulfite pulp comprises subjecting the pulp to caustic extraction.

Cette invention concerne un procédé de pré-traitement de pâte au bisulfite. Plus précisément, elle concerne un procédé nouveau de traitement en milieu alcalin de la pâte non blanchie en vue d'en extraire les impuretés métalliques.

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