Delignification and bleaching of a cellulose pulp with an alkali

Details Delignification and bleaching of a cellulose pulp with an alkali Delignification and bleaching of a cellulose pulp with an alkali

1985-05-24

1987-04-14

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Gas, vapor or mist contact

162 89, D21C 912, D21C 914, D21C 9147

Patent

active

046576339

ABSTRACT:
An improved process for bleaching and delignifying cellulose pulp. The process comprises subjecting the pulp to a bleaching stage followed by washing, and thereafter extracting the bleached pulp as received from the bleaching stage in a caustic extraction stage in the presence of oxygen and hypochlorite. The preferred embodiment is a sequential treatment of the bleached pulp with oxygen and hypochlorite without a pulp washing step between chemical additions. The process is characterized by enhanced delignification with high brightness and high viscosity. The process is further characterized by extraction stage filtrates of improved environmental characteristics.

REFERENCES:
patent: 4008120 (1977-02-01), Carles et al.
patent: 4081317 (1978-03-01), Gall et al.
patent: 4586420 (1986-02-01), Nonni
Chan et al "Modified Bleaching Sequences" Pulp & Paper Canada, 86: 1(1985) paper presented 1-31-83-2-4-83.

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