Ozone dioxane bleaching of chemical pulps

Details Ozone dioxane bleaching of chemical pulps Ozone dioxane bleaching of chemical pulps

1993-03-01

1994-10-11

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Gas, vapor or mist contact

162 72, D21C 910, D21C 9153

Patent

active

053544234

ABSTRACT:
A method of bleaching a chemical pulp with a gaseous bleaching agent by uniformly impregnating the pulp with a solvent for lignin and that is fully miscible with water but does not significantly swell cellulose so that the availability, of lignin to the bleaching agent is significantly improved, then subjecting the impregnated pulp to the action of the bleaching agent to preferentially attack the lignin for its subsequent solubilization and separation from the pulp.

REFERENCES:
"The Effect of Cellulose Protectors on Ozone Bleaching of Kraft Pulp" by Kamisima published in the Journal of Japanese Technical Association of the Pulp & Paper Industry, vol. 31, 9, pp. 62-70, Sep. 1977.
"The Use of Ozone in Bleaching of Pulps" by Liebergott et al., 1991 Pulping Conference, TAPPI Proceedings, pp. 1-23.
"Ozone Bleaching of Kraft Pulps" by Rothenberg et al., Oct. 1971, Empire State Paper Research Institute, Report No. 54.

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