Delignification and bleaching of wood pulp with oxygen

Details Delignification and bleaching of wood pulp with oxygen Delignification and bleaching of wood pulp with oxygen

1974-11-06

1976-04-20

Bashore, S. Leon

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Gas, vapor or mist contact

8111, 162 63, D21C 910

Patent

active

039517330

ABSTRACT:
Cellulose pulp, in the form of an alkaline, dilute aqueous slurry, is continuously bleached and delignified by oxygen dissolved and intimately dispersed and subdivided into the slurry so that no agglomerated bubbles are formed. The alkaline, dilute slurry is prepared by adding not more than about 2/3 of an oxygenated, alkaline solution to the undiluted pulp entering the system, subjecting the resulting partially diluted alkaline pulp slurry to an elevated temperature and pressure, then further diluting said partially diluted alkaline pulp slurry with the remainder of oxygenated alkaline solution.

REFERENCES:
patent: 3832276 (1974-08-01), Roymoulik et al.

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