Low dissolved solids control in pulp production

Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...

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162 43, 162248, D21C 714

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active

058491503

ABSTRACT:
Kraft pulp of increased strength and bleachability may be produced with decreased 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.

REFERENCES:
patent: 3425898 (1969-02-01), Laakso
patent: 3793137 (1974-02-01), Backlund
patent: 4670098 (1987-06-01), Thorsell et al.
Sjoblom, K. "A new Tech . . . Mill Trials", Tappic Journal, vol. 66, No. 9, pp. 97-102, Sep. 1983.
Greenwood, Brian "Continuous Digesters", Kamyr, Inc. Apr. 1991.
ITD #118702, "Extended Del. . . . Pulp", Nov. 1987, Kamyr, Inc. vol. 5, No. 11, Nov. 1987.

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