Sequential bleaching of kraft pulp with chlorine dioxide followe

Details Sequential bleaching of kraft pulp with chlorine dioxide followe Sequential bleaching of kraft pulp with chlorine dioxide followe

1975-07-02

1976-06-29

Bashore, S. Leon

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Gas, vapor or mist contact

8108, 8109, 162 67, 162 78, 162 89, D21C 912, D21C 914

Patent

active

RE0288870

ABSTRACT:
There is provided a process for the sequential bleaching of kraft pulp comprising reacting kraft pulp with chlorine dioxide until the chlorine dioxide is [at least partially] more than 50% depleted, reacting the kraft pulp with chlorine without an intermediate wash, and treating the kraft pulp with caustic.
[Via this process bleached kraft pulps with exceptionally good brightness and strength characteristics are obtained.]

REFERENCES:
patent: 2494542 (1950-01-01), Casciani
patent: 2513788 (1950-07-01), Day et al.
patent: 2741536 (1956-04-01), Stone
patent: 2903326 (1959-09-01), Heitman
patent: 3020197 (1962-02-01), Schuber

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