High efficiency two-step, high-low pH chlorine dioxide pulp blea

Details High efficiency two-step, high-low pH chlorine dioxide pulp blea High efficiency two-step, high-low pH chlorine dioxide pulp blea

1991-02-01

1993-12-07

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Treatment with particular chemical

162 65, D21C 914

Patent

active

052680754

ABSTRACT:
A high-efficiency wood pulp bleaching process to produce wood pulps with higher brightness at equal chlorine dioxide usage or of equal brightness at significantly reduced chlorine dioxide usage. The process comprises reacting the chlorine dioxide with wood pulp at a pH of about 5-10 for about 5-40 minutes and then acidifying the mixture to a pH of about 1.9-4.2. The mixture is then allowed to react for about 2 or more hours to complete the two-step high/low pH bleaching process.

REFERENCES:
patent: 3884752 (1975-05-01), Campbell et al.
patent: 4274912 (1981-06-01), Carles et al.
Macas et al, "The Effect of Chlorine in the Di Stage", J of Pulp & Paper Science, vol. 13, No. 3 May 1987, pp. J106-J110.
Publication by Teder et al., "Carbohydrate Degradation in Chlorine Dioxide Bleaching", in Tappi, Dec. 1978, vol. 61, No. 12, pp. 59-62.

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