Sequential bleaching of kraft pulp with chlorine dioxide followe

Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Gas – vapor or mist contact

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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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