Method for bleaching oxygen delignified cellulose-containing pul

Details Method for bleaching oxygen delignified cellulose-containing pul Method for bleaching oxygen delignified cellulose-containing pul

1982-07-19

1984-05-22

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Gas, vapor or mist contact

162 78, D21C 916

Patent

active

044500440

ABSTRACT:
In a method for bleaching oxygen delignified cellulose-containing pulp such as sulphate, sodium and sulphite pulps with ozone and peroxide, the ozone treatment takes place at two stages, the alkaline solution which is added subsequent to the ozone treatment includes peroxide and complex formers, and 55 to 85% of the total amount of chemicals is added at the first stage.

REFERENCES:
patent: 3944463 (1976-03-01), Samuelson et al.
patent: 3966542 (1976-06-01), Oldshue
patent: 4123317 (1978-10-01), Fritzvold et al.
Rothenberg, "Bleaching of Oxygen Pulps with Ozone", Tappi, vol. 58, No. 8, pp. 182-185, Aug. 1975.
Soteland, "Bleaching of Chemical Pulps with Oxygen and Ozone", Pulp & Paper Mag. of Canada, vol. 75, No. 4, p. 1153, (4-1974).
Hosukawa, "The Brightness and Stability of Ozone Bleached Kraft Pulp Treated with Hydrogen Peroxide", Govt. Ind. Research, Feb. 1976.

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