Bleaching of lignin and process for producing paper

Details Bleaching of lignin and process for producing paper Bleaching of lignin and process for producing paper

D - Textiles, Paper

21

C

D21C 9/10 (2006.01) D21C 9/00 (2006.01) D21H 17/65 (2006.01) D21H 21/32 (2006.01) D21H 23/04 (2006.01)

Patent

CA 2374904

The present invention relates to the bleaching of lignin present in pulp fibers in an aqueous environment such as a pulp suspension. The invention also relates to a process for producing paper or board from pulp containing such bleached lignin. According to the invention carbon dioxide is used for the bleaching of lignin.

La présente invention concerne le blanchiment de la lignine présente dans les fibres de pâte à papier se trouvant dans un environnement acqueux tel qu'une suspension de pâte. L'invention concerne également un procédé permettant de produire du papier ou du carton à partir de pâte à papier contenant de la lignine blanchie. Selon l'invention, on utilise du dioxyde de carbone pour blanchir la lignine.

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