T12-019

Pulps. Degree of delignification during bleeding.

Le présent fascicule de documentation décrit une méthode volumétrique permettant de chiffrer l'efficacité d'une phase quelconque de délignification. Exemple: stades du blanchiment, délignification au chlorite. La méthode est utilisable lorsque l'indice de dureté KAPPA (NF T 12-018) ne l'est plusen raison de la faible teneuren lignine résiduelle des pâtesde cellulose. Il ne s'agit pas ici de doser la vraie lignine résiduelle d'une pâte en cours de délignification, puisque la composition chimique de la lignine est profondément modifiée au cours des phases de blanchiment.

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