Process for pulping lignocellulosic material with an alkaline su

Details Process for pulping lignocellulosic material with an alkaline su Process for pulping lignocellulosic material with an alkaline su

1980-03-13

1982-12-14

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Treatment with particular chemical

162 83, D21C 302, D21C 320

Patent

active

043637000

ABSTRACT:
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-dihydroxyhydroanthracene compound, and a reducing additive consisting of a sulfite, hydrogen sulfite, thiosulfate or formate.

REFERENCES:
patent: 4012280 (1977-03-01), Holton
patent: 4178861 (1979-12-01), Vanderhock
patent: 4181565 (1980-01-01), Nakamura et al.
patent: 4213821 (1980-07-01), Vanderhock
Rydholm, "Pulping Processes", pp. 583-585, Interscience Publishers, N.Y. 1967.

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