Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...
Patent
1982-02-25
1983-12-13
Chin, Peter
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With regeneration, reclamation, reuse, recycling or...
210711, 210717, 210723, 210724, 210928, D21C 1100
Patent
active
044203691
ABSTRACT:
Pulp mill bleach plant caustic extraction effluent is decolorized using a primary or other sludge from a pulp and paper mill. The sludge is acidified and mixed with the effluent. After a short incubation period, the mixture of acidified sludge and effluent is raised to at least neutral pH, causing precipitation of most of the color in the effluent. The precipitated color may then easily be separated from the liquor by any conventional clarification technique. The method avoids the consumption of large quantities of expensive reagents or high transportation costs associated with the prior art decolorization techniques used on such effluent.
REFERENCES:
patent: 2218053 (1940-10-01), Schwabe et al.
patent: 3627679 (1971-12-01), Fuller
patent: 3740363 (1973-06-01), Fuller
Chang Hou-min
Eaton David C.
Kirk Thomas K.
Chin Peter
McConnell David G.
Silverstein M. Howard
The United States of America as represented by the Secretary of
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