Chlorine-free bleaching method for dissolving-grade pulps using

Details Chlorine-free bleaching method for dissolving-grade pulps using Chlorine-free bleaching method for dissolving-grade pulps using

1991-02-07

1992-09-08

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With regeneration, reclamation, reuse, recycling or...

162 65, 162 78, D21C 9153, D21C 916

Patent

active

051455579

ABSTRACT:
A three-stage bleaching process for dissolving grade pulp utilizes the sequence OP(alkaline)-Z-P and the off gas from the Z-stage is delivered to the alkaline (OP)-stage whose parameters are controlled to fully react all of the oxygen of the off gas. The filtrate or waste water from the Z-stage, at a pH below 3, serves to dilute the alkaline OP-stage pulp before Z-stage bleaching and/or for de-ashing of the P pulp following the P-stage.

REFERENCES:
patent: 4196043 (1980-04-01), Singh
patent: 4283251 (1981-08-01), Singh
patent: 4619733 (1986-10-01), Kooi
Rydholm, "Pulping Processes", Interscience Publishers, New York, 1967, pp. 1049-1051.

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