Process for oxygen bleaching using two vertical reactors

Details Process for oxygen bleaching using two vertical reactors Process for oxygen bleaching using two vertical reactors

1992-03-24

1993-06-08

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Gas, vapor or mist contact

162 19, 162 57, 162 68, D21C 9147

Patent

active

052175758

ABSTRACT:
A process for oxygen bleaching fibrous cellulose pulp is described in which the pulp passes a first delignification zone with a predetermined low temperature and a second delignification zone with a predetermined high temperature which is higher than that in the first delignification zone. The pulp is fed through a first vertical reactor containing said first delignification zone with low temperature, and thereafter through a second vertical reactor containing said second delignification zone with high temperature. The temperature in the first delignification zone is either maintained at the temperature that the pulp entering for bleaching has acquired during a previous treatment before the oxygen bleaching, or as required is adjusted by the controlled supply of steam to a mixer disposed in the pipe before the first reactor. The temperature in the second delignification zone is adjusted by the controlled supply of steam to a mixer disposed in the pipe between the two reactors.

REFERENCES:
patent: 3944463 (1976-03-01), Samuelson et al.
patent: 4806203 (1989-02-01), Elton
patent: 4834837 (1989-05-01), Loquenz
patent: 4886577 (1989-12-01), Wiley
Hsu et al, "Oxygen Bleaching Kinetics at Ultra-Low Consistency", Dec., 1987 TAPPI Journal, pp. 107-111.
Courchene et al, "Improvement of Medium Consistency . . . Control", Nov. 15-16, 1984, Oxygen Delignification Symposium, TAPPI Press, pp. 11-15.
Sunds Defibrator "Oxygen Delignification" brochure.

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