Use of ethyleneamines in the removal of lignin

D - Textiles – Paper – 21 – C

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D21C 9/02 (2006.01)

Patent

CA 2210637

Ethyleneamines are used in washing pulp to remove lignin. A process for washing a cellulose pulp mixture containing lignin to remove at least a portion of the lignin therefrom comprises use of a washing composition with at least 100 ppm of an ethyleneamine. The process includes an improvement in a washing process for a cellulose pulp mixture containing lignin wherein a washing composition is used to remove at least a portion of the lignin, the improvement comprising use of at least 100 ppm of an ethyleneamine with the washing composition and/or using an amount of ethyleneamine at least equivalent to 100 ppm based on the washing composition with the washing composition. The washing composition is also novel and includes a washing composition for washing kraft pulp comprising water and at least 100 ppm of an ethyleneamine.

Les éthylèneamines s'emploient dans le lavage de la pâte de cellulose pour éliminer la lignine. Un procédé selon l'invention, destiné au lavage d'un mélange de pâte de cellulose contenant de la lignine pour en éliminer au moins une partie de cette dernière, comporte l'utilisation d'une composition de lavage contenant au moins 100 ppm d'une éthylèneamine. Ce procédé comprend une amélioration d'un processus de lavage d'un mélange de pâte de cellulose contenant de la lignine, dans lequel on utilise une composition de lavage pour éliminer au moins une partie de la lignine, l'amélioration comprenant l'emploi d'au moins 100 ppm d'une éthylèneamine avec la composition de lavage et/ou l'emploi d'une quantité d'éthylèneamine équivalant au moins à 100 ppm, sur la base de la composition de lavage, avec la composition de lavage. La composition de lavage est une nouvelle composition également destinée au lavage de pâte kraft comprenant de l'eau et au moins 100 ppm d'une éthylèneamine.

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