Method of bleaching cellulose pulp with a main conduit for...

Details Method of bleaching cellulose pulp with a main conduit for... Method of bleaching cellulose pulp with a main conduit for...

2008-05-20

2008-05-20

Hug, Eric (Department: 1731)

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Treatment with particular chemical

C162S017000, C162S019000, C162S029000, C162S037000, C162S043000, C162S052000, C162S060000, C162S065000, C162S088000, C162S089000, C162S190000, C068S175000, C068S18100D

Reexamination Certificate

active

07374637

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 main 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: 4104114 (1978-08-01), Rowlandson et al.
patent: 6106667 (2000-08-01), Henricson
patent: 6569284 (2003-05-01), Yin et al.

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