Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Gas – vapor or mist contact
Patent
1988-12-09
1990-02-20
Alvo, Steve
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Gas, vapor or mist contact
162 66, 162 88, 162 89, D21C 912, D21C 9147, D21C 9153, D21C 914
Patent
active
049023810
ABSTRACT:
Ozone and chlorine are used to bleach cellulosic fibrous material pulp in the production of kraft pulp for paper and paper products, being applied together in a mixture. When the ozone and chlorine are applied simultaneously it is possible to achieve delignification to a greater extent than is possible utilizing chlorine at any level. The total chlorinated ring compounds in the bleach plant effluent are remarkably reduced utilizing the ozone-chlorine mixture, compared to all chlorine, with resulting decrease in the fish toxicity of the bleach plant effluent. Utilizing an O.sub.3 /Cl.sub.2 E.sub.o D bleaching sequence (only three stages) it is possible to obtain pulp with 90 TAPPI Absolute, or greater, brightness.
REFERENCES:
patent: 396325 (1889-01-01), Brin
patent: 1957937 (1934-05-01), Campbell et al.
patent: 4080249 (1978-03-01), Kempf et al.
patent: 4093506 (1978-06-01), Richter
patent: 4372812 (1983-02-01), Phillips et al.
Liebergott et al, "The Use of Ozone in Bleaching and Brightening Wood Pulps", Tappi, Pulp & Paper Seminar, Nov. 1978.
Enz et al, "Oxidative Extraction: An Opportunity of Splitting the Bleach Plant", Tappi, Jun. 1984.
Singh, "Ozone Replaces Chlorine in the First Bleaching Stage", Tappi, vol. 65, No. 2, Feb. 1982.
Berry et al, "Using Oxygen-Alkali Extraction to Simplify the Chlorination Stage", J. Pulp & Paper Science, vol. 12, No. 5; Sep. 1986.
Alvo Steve
Kamyr Inc.
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