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...


Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0


162 43, 162248, D21C 714




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.

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.


Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.


Low dissolved solids control in pulp production does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Low dissolved solids control in pulp production, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Low dissolved solids control in pulp production will most certainly appreciate the feedback.

Rate now


Profile ID: LFUS-PAI-O-1454321

All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.