Modified digestion of paper pulp followed by ozone bleaching

Details Modified digestion of paper pulp followed by ozone bleaching Modified digestion of paper pulp followed by ozone bleaching

1992-02-18

1994-07-12

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

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

162 65, 162 78, 162 82, D21C 302, D21C 9153, D21C 916, D21C 1100

Patent

active

053285646

ABSTRACT:
Kraft pulp is bleached to a brightness of about 90 CPPA or greater, without the use of chlorinated organic compounds that has commercially acceptable strength properties. During production of the kraft pulp it is subjected to extended delignification, by adding kraft white liquor to a first recirculation loop in the digester, and/or a second, wash, recirculation loop in the digester; or by conventional pulping followed by two oxygen stages, with washing between the stages. The extended delignification pulp is then subjected to ozone bleaching, with an ozone dosage of less than 1.0% (preferably less than about 0.5%). The ozone bleaching sequence may be a (ZE)P(ZE)P sequence.

REFERENCES:
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patent: 4834837 (1989-05-01), Loquenz et al.
patent: 4946556 (1990-08-01), Prough
patent: 5164043 (1992-11-01), Griggs et al.
Liebergott et al, "Bleaching of Softwood Kraft Pulp Without Chlorine Compounds", TAPPI J., Aug. 1984, pp. 76-80.
Macas et al, "Production of Bleached Chemical Pulp in the Future"; Int. Pulp Bleaching Conf. Jun. 13, 1991.
MCC.TM. literature, 1989.

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