Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...
Patent
1994-11-07
1998-12-29
Alvo, Steven
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With regeneration, reclamation, reuse, recycling or...
162 34, 162 35, 162 38, 162 60, 162 65, 162 82, 162 88, 162 89, D21C 1104, D21C 1110
Patent
active
058535357
ABSTRACT:
A process for bleaching wood pulp is provided comprising subjecting the wood pulp, after brown stock washing, to an oxygen delignification stage, a washing sequence, a first chlorine dioxide bleaching stage, an oxidative extraction stage, optionally at least one final chlorine dioxide bleaching stage and then recycling the filtrate from the oxidative extraction stage counter-currently through the bleaching plant and brown stock washing. Additionally, and quite beneficially, the filtrate from the first chlorine dioxide bleaching stage is also recycled counter-currently through the brown stock washing thereby significantly reducing the environmental impact associated with the manufacture of bleach wood pulp.
REFERENCES:
patent: 532332 (1895-10-01), Maples et al.
patent: 3698995 (1972-10-01), Rapson
patent: 4039372 (1977-08-01), Reeve et al.
patent: 4042452 (1977-08-01), Arhippainen et al.
patent: 4269656 (1981-05-01), Perkins
patent: 4619733 (1986-10-01), Kooi
patent: 4946556 (1990-08-01), Prough
patent: 5061343 (1991-10-01), Azarniouch et al.
patent: 5300191 (1994-04-01), Lindberg
patent: 5328563 (1994-07-01), Henricson et al.
patent: 5340440 (1994-08-01), Henricson
patent: 5374333 (1994-12-01), Nykanen et al.
Union Camp Leads Ozone Pulping Drive in North American Mills -Sep. 1994 -Pulp + Paper pp. 69-71.
Union Camp Begins Ozone Era with New Kraft Bleaching Line at Franklin, VA -Nov. 1992 -Pulp + Paper, pp. 42+54.
Wells E. Natt, Union Camp's Mill Eperience with Ozone Bleaching -Mar. 1994 -6 pages -Introductory Remarks -International Non-Chlorine Bleaching Conf., Amelia cls., H.
BFR: A New Process Toward Bleach Plant Closure -G. Maples et al. -10 pages -1994 International Pulp Bleaching Conf. Vancouver, B.C.
J. Robert Caron + John Fleck-Metals Management in a Closed Kraftmill Bleach Plant-Nov. 8, 1994-1994 Tappi Pulping Conference.
N. Soteland-Bleaching of Chemical Pulps with Oxygen and ozone-Presented-1973 International Pulp Bleaching Conference.
Caron Joseph R.
Fleck John A.
Maples Gerald E.
Alvo Steven
Champion International Corporation
Stewart, II Richard C.
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