Method and bleaching line with a main conduit for wash liquor

Details Method and bleaching line with a main conduit for wash liquor Method and bleaching line with a main conduit for wash liquor

2006-07-18

2006-07-18

Walls, Dionne A. (Department: 1731)

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Treatment with particular chemical

C162S060000, C162S232000, C162S089000, C008S156000, C068S175000, C068S18100D, C068S184000

Reexamination Certificate

active

07077931

ABSTRACT:
The method is for bleaching cellulose pulp in a bleach line that has at least two bleaching steps. The filtrate distribution is led up through the bleaching line counter-currently to the flow of cellulose pulp established in the bleaching line. A single joint main conduit is used for the bleaching steps. Wash filtrates obtained from the wash steps, used after or before the bleaching step, are led in conduits to branch locations on the train conduit that are positioned downstream of the branch location for drawing off of wash and/or dilution liquor for the wash step in question. All branch points in the joint main conduit are in fluid communication with one another along the main conduit.

REFERENCES:
patent: 3698995 (1972-10-01), Rapson
patent: 4104114 (1978-08-01), Rowlandson et al.
patent: 4762146 (1988-08-01), Ewbank et al.
patent: 5403441 (1995-04-01), McDonald
patent: 5853535 (1998-12-01), Maples et al.
patent: 6106667 (2000-08-01), Henricson
patent: 1443144 (2004-08-01), None

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