Three stage process for pulping lignocellulosic materials includ

Details Three stage process for pulping lignocellulosic materials includ Three stage process for pulping lignocellulosic materials includ

1975-06-19

1976-08-17

Bayshore, S. Leon

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Gas, vapor or mist contact

162 70, 162 82, 162 86, 162 90, D21C 302, D21C 910

Patent

active

039752321

ABSTRACT:
A three stage process for pulping lignocellulosic materials, preferably softwood chips comprising: as a first stage treating the lignocellulosic material with a cyanide ion-containing solution at a pH between 7 and 12 to form cyanohydrin groups; in a second stage digesting the thus treated lignocellulosic material with an alkali metal pulping solution containing hydroxyl ions; and as a third stage treating the thus digested lignocellulosic material with 1% to 12% by weight sodium hydroxide, as sodium oxide based on o.d. pulp from the alkaline pulping stage, in the presence of an excess of oxygen.

REFERENCES:
patent: 3384533 (1968-05-01), Robert et al.
patent: 3532596 (1970-10-01), Bills et al.
patent: 3652386 (1972-03-01), Noreus et al.
patent: 3663358 (1972-05-01), Falkehag et al.
patent: 3691008 (1972-09-01), Worster et al.

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