Process for pulping lignocellulosic material

Details Process for pulping lignocellulosic material Process for pulping lignocellulosic material

1982-08-23

1984-09-25

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Treatment with particular chemical

162 76, 162 82, 162 83, D21C 302, D21C 304, D21C 320

Patent

active

044734395

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: 4094735 (1978-06-01), Holgersson
patent: 4178861 (1979-12-01), Vanderhoek
patent: 4181565 (1980-01-01), Nakamura et al.
patent: 4213821 (1980-07-01), Vanderhoek
Rydholm, "Pulping Processes", pp. 583-585, Interscience Publishers, N.Y. 1967.

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