Method of delignifying wood chips with oxygen by adding cooking

Details Method of delignifying wood chips with oxygen by adding cooking Method of delignifying wood chips with oxygen by adding cooking

1978-04-25

1979-10-23

Bashore, S. Leon

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Gas, vapor or mist contact

162 50, 162 76, 162 90, D21C 108, D21C 302, D21C 304

Patent

active

041720067

ABSTRACT:
A one-stage oxygen delignification system in which wood chips are first pressurized with oxygen and the oxygen allowed to reach equilibrium within the chips before the addition of cooking liquor. Cooking liquor is added to the chips while they are maintained under the pressurized oxygen. After the addition of cooking liquor under pressure, the oxygen pressure may be further raised. The cooking liquor may be at cooking temperature when added, or the slurry may be raised to cooking temperature after the liquor is added or after the additional pressure has been applied. The pressure may be pulsed by lowering and raising it during cooking.

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Solano, "A Study of Oxygen-Soda Pulping on Eucalyptus Globulus"; Masters Thesis; Syracuse Univ., 6-1972.
Hata et al., "Oxygen-Alkali Semichemical Pulping of Wood Chips", TAPPI, vol. 58, No. 2, 2-1975.
Osawa et al., "The Action of Gaseous Reagents on Cellulosic Materials II", TAPPI, vol. 46, No. 2, Feb. 1963.
Makkonen et al., "Preliminary Studies of Peroxides and Oxygen Pretreatment in Alkaline Pulping", a paper presented at the 25th TAPPI Alkaline Pulping Conference of 1971.

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