Method of bleaching cellulosic pulps with ozone and a protective

Details Method of bleaching cellulosic pulps with ozone and a protective Method of bleaching cellulosic pulps with ozone and a protective

1994-07-06

1996-06-25

Alvo, Steven

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Gas, vapor or mist contact

162 72, D21C 9153

Patent

active

055296629

ABSTRACT:
Cellulosic pulps are bleached with ozone in an ozone bleaching stage in an aqueous medium containing an additive in an effective amount not exceeding 5% weight concentration of the aqueous medium. The additive is selected from a group consisting of N-alkylated ureas, N-alkylated lactams and N-alkylated amides. pH in the Z stage is operated under conventional ozone bleaching conditions, but preferably at high consistency and at low temperature, below 5.degree. C.

REFERENCES:
Liebergott et al, "The Use of Ozone In Bleaching Wood Pulps" Pulping & Bleaching Seminar, New Orleans Nov. 1978 pp. 90-105.

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