Two stage process for the oxygen delignification of lignocellulo

Details Two stage process for the oxygen delignification of lignocellulo Two stage process for the oxygen delignification of lignocellulo

1989-05-19

1991-04-30

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With squeezing, compression, rubbing, kneading

162 65, 162 78, D21C 9147, D21C 916, D21C 918

Patent

active

050115723

ABSTRACT:
A process is provided for a two-stage oxygen delignification of chemical pulp in which 0.01% to 1% hydrogen peroxide is incorporated into the first and, optionally the second stage. The invention is particularly suitable when the pulp is subsequently bleached with at least one chlorine dioxide stage and at least one hydrogen peroxide stage.

REFERENCES:
patent: 3719552 (1973-03-01), Farley
patent: 3874992 (1975-04-01), Liebergott
patent: 4087318 (1978-05-01), Samuelson et al.
patent: 4259150 (1981-03-01), Prough
patent: 4298427 (1981-11-01), Bentvelzen et al.
patent: 4568420 (1986-02-01), Nonni
patent: 4806203 (1989-02-01), Elton

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