Process for the delignification of lignocellulosic material by m

Details Process for the delignification of lignocellulosic material by m Process for the delignification of lignocellulosic material by m

1975-06-11

1977-09-27

Bashore, S. Leon

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With regeneration, reclamation, reuse, recycling or...

162 40, 162 60, 162 63, 162 65, 162 79, D21C 302, D21C 902, D21C 914, D21C 1106

Patent

active

040509818

ABSTRACT:
Process for improving the selectivity of delignification of lignocellulosic material in the presence of oxygen gas and alkali by maintaining a carbon monoxide content in the gas phase within the range from about 1% to about 12% by volume. The carbon monoxide concentration is maintained by withdrawing carbon monoxide and oxygen gas from the delignification, and separating and recycling withdrawn oxygen gas.

REFERENCES:
patent: 1790260 (1931-01-01), Cable
patent: 2811518 (1957-10-01), Mitchell et al.
patent: 3525665 (1970-08-01), Gessner
patent: 3764464 (1973-10-01), Samuelson
patent: 3790637 (1974-02-01), Yam
Kratzl et al., "Model Experiments on Oxygen Bleaching of Pulp (1) Formation of Carbon Monoxide from Carbohydrates, Sugar Alcohols, and Phenols", Holzforshung 28, No. 3, 77-81, June 1974, ABIPC vol. 45, No. 8.
Larducci et al, "Influence of Transition Metals in Oxygen Pulping", TAPPI, vol. 50, No. 2, Feb. 1975, 162-165.

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