Method of treating pulp

Details Method of treating pulp Method of treating pulp

1998-01-27

2000-07-11

Chin, Peter

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With washing

68 27, D21C 902

Patent

active

060867132

ABSTRACT:
A method is provided by which it possible to intensify a cellulose pulp wash without requiring the purchase of additional equipment. In a washing system having a plurality of stages with a filtrate from each stage, the stages in sequence being N, N+1, etc., and each stage including filtrates F.sub.N and F.sub.N+1, etc., part of the filtrate F.sub.N (e.g. about 5-30 %) is combined with all or part of the filtrate for F.sub.N+1 to produce a combined filtrate, and the combined filtrate is fed in washing stage N as wash liquid. The part of the filtrate F.sub.N that is taken for use as wash liquid in stage N is typically from the end of the washing stage N. The process may be repeated for most of the stages of the washing system.

REFERENCES:
patent: 3454970 (1969-07-01), Sutherland
patent: 4705600 (1987-11-01), Jacobsen
patent: 4780181 (1988-10-01), Lind
patent: 4919158 (1990-04-01), Kokkonen et al.
patent: 5116423 (1992-05-01), Kokkonen et al.
patent: 5567279 (1996-10-01), Phillips et al.

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