Woodpulp bleaching process

Details Woodpulp bleaching process Woodpulp bleaching process

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 88, 162 89, D21C 912, D21C 914

Patent

active

RE0288845

ABSTRACT:
There is provided a process for the bleaching of woodpulp comprising reacting the pulp with chlorine dioxide until the chlorine dioxide is [at least partially] more than 50% depleted and, thereafter, without an intermediate wash, reacting the woodpulp with chlorine. [The process provides bleached pulps with excellent strength brightness, and color reversion properties.]

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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