Process for bleaching cellulose pulp with molecular oxygen

Details Process for bleaching cellulose pulp with molecular oxygen Process for bleaching cellulose pulp with molecular oxygen

1974-05-08

1978-09-19

Bashore, S. Leon

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Gas, vapor or mist contact

162 38, D21C 910

Patent

active

041151860

ABSTRACT:
A process for bleaching cellulose pulp with molecular oxygen under alkaline conditions and at an elevated temperature in a bleaching zone is disclosed in which oxygen gas is dispersed into an alkaline bleaching solution under an increased pressure, the oxygen-containing, alkaline bleaching solution is heated to at least the elevated bleaching temperature, the pressure of the hot, oxygen-containing, alkaline bleaching solution is lowered to the pressure prevailing in the bleaching zone, and the hot, oxygen-containing, alkaline bleaching solution is brought, in the bleaching zone, into contact with the cellulose pulp to bleach the latter with the oxygen gas released from the bleaching solution.

REFERENCES:
patent: 3759783 (1973-09-01), Samuelson et al.
patent: 3832276 (1974-08-01), Roymoulik et al.

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