Impact of temperature and alkali charge on pulp brightness

Details Impact of temperature and alkali charge on pulp brightness Impact of temperature and alkali charge on pulp brightness

D - Textiles, Paper

21

C

D21C 3/22 (2006.01) D21C 1/06 (2006.01) D21C 11/00 (2006.01)

Patent

CA 2184706

A method for improving pulp brightness utilizes a combination of a distributed total white liquor charge during the warm fill, hot fill and cooking stages of a batch cooking process and low cooking temperatures during the cooking stage. The high total white liquor charge ranges between 15 % AA ? 35 % AA, while the cooking temperatures range between 150 ? 168 °C.

Procédé d'amélioration de la brillance de la pâte à papier mettant en oeuvre la combinaison d'une charge répartie de la liqueur blanche totale au cours des étapes de remplissage à température moyenne, de remplissage à chaud et de cuisson, dans le cadre d'un processus de cuisson par fournées, et de températures de cuisson faibles au cours de l'étape de cuisson. L'alcalinité active de la charge totale supérieure de liqueur blanche est de l'ordre de 15 à 35 %, tandis que les températures de cuisson sont comprises entre 150 et 168 ~C.

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