Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Treatment with particular chemical
Patent
1980-12-24
1983-10-18
Smith, William F.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Treatment with particular chemical
162 79, 423273, D21C 916
Patent
active
044103972
ABSTRACT:
An improved peroxide based brightening and delignifying solution and process for liqnocellulosic pulp, characterized by selective delignification and pulp viscosity retention is disclosed. The process comprises maintaining a pulp slurry to a temperature between 40.degree. C. and 120.degree. C. for 0.5 hours to 8 hours. The slurry comprises lignocellulosic pulp; from 0.1% to 20% by weight based on O.D. pulp of peroxide; from 0.1% to 10% by weight based on O.D. pulp of a metal-containing additive whose metallic portion is selected from the group consisting of tin, titanium, and vanadium; and sufficient acid to maintain the .sub.f H of the slurry between about 1 and about 7. In a preferred embodiment of this invention, a tin additive is employed and the partially delignified and brightened pulp is further bleached with the unconsumed peroxide by adjusting the pH of the slurry to between 8 and 12 and maintaining the temperature of the slurry from 40.degree. C. to 90.degree. C. for 0.1 to 4 hours.
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Haley, Jr. James F.
International Paper Company
Shaw Robert M.
Smith William F.
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