Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...
Patent
1981-02-11
1983-02-08
Alvo, Steve
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With regeneration, reclamation, reuse, recycling or...
162 60, 162 65, 162 76, 162 78, D21C 910, D21C 916
Patent
active
043728120
ABSTRACT:
A chlorine-free bleaching process for lignocellulosic pulp characterized by a series of bleaching stages comprising in sequence a peroxide bleaching stage, the peroxide being selected from the group consisting of alkaline hydrogen peroxide, acidic hydrogen peroxide, and peroxy acid and at least one ozone bleaching stage and in one embodiment the sequence including an initial oxygen bleaching stage before the peroxide bleaching stage. In continuous operation the effluent from each of these sequential stages provides the preferred wash for the preceding washing step and the diluent for the preceding bleaching stage, the final effluent being recyclable for effective closed cycle operation.
REFERENCES:
patent: 3652387 (1972-03-01), Wilder
patent: 3663357 (1972-05-01), Liebergott
patent: 3806404 (1974-04-01), Liebergott et al.
patent: 3980517 (1976-09-01), MacTaggart
patent: 4080249 (1978-03-01), Kempf et al.
Suteland "Bleaching of Chemical Pulps With Oxygen and Ozone" Pulp and Paper Magazine of Canada, vol. 75, No. 4 Apr. 1974.
Liebergott "Sequential Treatment of Mechanical Pulps at High Consistency With H.sub.2 O.sub.2 and O.sub.3 " Pulp & Paper Canada, pp. 70-73, vol. 73, No. 9, Sep. 1972.
Eckert Robert C.
Kempf Arthur W.
Phillips Richard B.
Alvo Steve
Haley, Jr. James F.
International Paper Company
Shaw Robert M.
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