Method of producing pulp using single-stage cooking with...

Details Method of producing pulp using single-stage cooking with... Method of producing pulp using single-stage cooking with...

D - Textiles, Paper

21

C

D21C 3/04 (2006.01) D21C 9/16 (2006.01)

Patent

CA 2270524

The invention relates to a method of producing pulp with a high brightness using single-stage cooking with formic acid, washing with performic acid and bleaching with oxidizing bleaching chemicals. In performic acid washing, the rapid formation and rapid reactions of performic acid (HCOOOH) are utilized for modification of residual lignin. The method of the invention provides an ISO brightness exceeding 90 % without chlorine chemicals. The method can be applied to both herbaceous plants and wood.

L'invention a pour objet un procédé de fabrication de pulpe ayant un degré de blancheur élevé, ledit procédé consistant en une cuisson à l'acide formique effectuée en une seule opération, en un lavage à l'acide performique et en un blanchiment par produits chimiques de blanchiment oxydants. Lors du lavage à l'acide performique, la formation et les réactions rapides de l'acide performique (HCOOOH) sont utilisées pour modifier la lignine résiduaire. Ledit procédé fournit un degré de blancheur ISO supérieur à 90 %, sans produits chimiques chlorés. Ledit procédé peut être appliqué aux plantes herbacées et au bois.

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