Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...
Patent
1995-04-03
1997-06-03
Kim, Christopher
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With regeneration, reclamation, reuse, recycling or...
162 32, 162 36, 162 39, 162 42, 162 82, 162 90, D21C 1112
Patent
active
056350279
ABSTRACT:
A method of recycling sodium-based salts used for digesting wood in a digester during the manufacture of pulp and paper. The method comprises collecting a black liquor from the digester, concentrating the black liquor, and adding a salt to the black liquor in an amount sufficient to reduce the viscosity thereof. Preferred salts are thiocyanate salts. The black liquor is then oxidized to produce a green liquor and a causticizer added to the green liquor to produce a white liquor containing the sodium-based salts to be recycled. The white liquor is then returned to the digester.
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Khan Saad A.
Prevysh Victoria A.
Roberts Joanna E.
Spontak Richard J.
Kim Christopher
North Carolina State University
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