D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
D21C 3/22 (2006.01) D21C 3/02 (2006.01) D21C 3/24 (2006.01) D21C 7/00 (2006.01) D21C 7/14 (2006.01)
Patent
CA 2222664
Kraft pulp of increased strength and bleachability may be produced with deceased consumption of effective alkali, and at a lower H factor, by keeping the dissolved organic material (DOM) concentration low substantially through the entire kraft cook, including by extracting high DOM liquid from at least one part of a continuous digester and replacing it with much lower level DOM liquid. Existing pulp mills having two- vessel hydraulic, one-vessel hydraulic, or other systems may be retrofit to provide for extractions and additions of low DOM dilution liquor (including substantially DOM-free white liquor). Also, commercial size batch digesters (8 tons per day of pulp or more) can be operated with low DOM liquor to produce increased strength pulp. Using dilution with low DOM liquor also results in reduced H factor and effective alkali consumption, and increased bleachability.
Chasse R. Fred
Laakso Richard O.
Marcoccia Bruno S.
Phillips Joseph R.
Prough J. Robert
Ahlstrom Machinery Inc.
Andritz Inc.
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
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