Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...
Patent
1983-12-01
1985-08-27
Alvo, Steve
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With regeneration, reclamation, reuse, recycling or...
162 44, 162 45, 162 87, 162 88, 162DIG8, D21C 914
Patent
active
045376565
ABSTRACT:
A method for delignifying and/or bleaching cellulose pulp adds to the cellulose pulp a liquid which contains chlorine dioxide, causes the pulp to react with the chlorine dioxide over a selected period of time, and then reduces the amount of available active chlorine, optionally to a negligible amount, either by reducing the amount of liquid accompanying the cellulose pulp and/or by displacing such liquid with a newly supplied liquid containing no active chlorine or at most only a small amount of active chlorine; the displaced liquor can be replenished with chlorine and optionally with chlorine dioxide, and then added mainly to fresh cellulose pulp in the same bleaching stage, and/or to cellulose pulp in another bleaching stage.
REFERENCES:
Pattysun et al., "Bleaching in the Closed Cycle Mill at Great Lakes Forest Products, Ltd.", Pulp and Paper Canada, presented in June 1979 at Pulp and Bleaching Conference at Toronto.
Rapson et al., "Dynamic Bleaching: Continuous Movement of Pulp Through Liquor Increases Bleaching Rate", TAPPI, Aug. 1966, vol. 49, No. 8.
Gullichsen, "Pilot Plant Application of the Displacement Bleaching Process", TAPPI, Nov. 1973, vol. 56, Nov. 11.
Bergstrom John R.
Lindahl Jonas A. I.
Alvo Steve
Mo och Domsjo Aktiebolag
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