Process for pulping lignocellulosic material

Details Process for pulping lignocellulosic material Process for pulping lignocellulosic material

D - Textiles, Paper

21

C

9/17

D21C 3/02 (2006.01) D21C 3/22 (2006.01)

Patent

CA 1110413

- 33 - PROCESS FOR PULPING LIGNOCELLULOSIC MATERIAL ABSTRACT OF THE DISCLOSURE Lignocellulosic material is pulped with an alkaline sulfide cooking liquor which is characterized by containing a combination of a delignification-accelerating additive consisting of a quinone compound, hydroquinone compound, 9,10-diketohydroanthracene compound or 9,10-dihydroxy- hydroanthracene compound, and a reducing additive consisting of a sulfite, hydrogen sulfite, thiosulfate or formate.

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