Process for the oxidative delignification of demethylated chemic

Details Process for the oxidative delignification of demethylated chemic Process for the oxidative delignification of demethylated chemic

1985-12-19

1988-03-08

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Gas, vapor or mist contact

162 78, 162 79, 162 80, 162 84, 162 85, 162 88, D21C 900, D21C 914, D21C 9147, D21C 916

Patent

active

047298170

ABSTRACT:
The extent of delignification of chemical pulps by oxygen-containing chemicals, preferably hydrogen peroxide, is enhanced by demethylating the pulp prior to such oxidative delignification, to a degree of demethylation of at least about 30%, preferably at least about 50%. Demethylation may be achieved by chemical treatment of the already-formed pulp or by modification to the pulping process to result in demethylated pulp.

REFERENCES:
patent: 2882965 (1959-04-01), Weyman et al.
patent: 4152197 (1979-05-01), Lindahl et al.

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