Production of prehydrolyzed pulp

Details Production of prehydrolyzed pulp Production of prehydrolyzed pulp

D - Textiles, Paper

21

C

D21C 3/26 (2006.01) D21C 1/00 (2006.01) D21C 1/04 (2006.01) D21C 3/02 (2006.01)

Patent

CA 2179914

Process for preparing pulp from ligning-containing cellulosic material are disclosed including a prehydrolysis step followed by neutralizing hydrolysate and the prehydrolyzed cellulosic material in the reactor with alkaline neutralizing liquor, removing the neutralized hydrolysate from the reactor and delignifying the neutralized prehydrolyzed cellulosic material with alkaline cooking liquor containing sodium sulfide and sodium hydroxide.

Procédé de préparation de pâte à partir d'une matière cellulosique renfermant de la lignine, consistant à procéder à une étape de préhydrolyse, à neutraliser dans un réacteur l'hydrolysat et la matière cellulosique préhydrolysée, au moyen d'une liqueur alcaline de neutralisation, à extraire l'hydrolysat neutralisé du réacteur, et à délignifier la matière cellulosique préhydrolysée neutralisée, au moyen d'une liqueur alcaline de cuisson renfermant du sulfure de sodium et de l'hydroxyde de sodium.

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