Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With plural or specified mechanical defibering step
Patent
1972-06-14
1978-01-24
Bashore, S. Leon
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With plural or specified mechanical defibering step
162 32, 162 66, 162 67, 162 82, 162 85, 162 86, 162 89, 162 90, D21C 318
Patent
active
040702332
ABSTRACT:
A pulping process which includes the steps of oxidizing vegetable materials with an oxidizing chemical selected from the group comprising Cl.sub.2, Cl.sub.2 O,ClO.sub. 2, Mg(ClO).sub.2, Mg(ClO.sub.2).sub.2 Mg.(ClO.sub. 3).sub.2 and mixtures thereof, extracting the oxidized materials with Mg(OH).sub.2 thereby to delignify and bleach the materials and treating the waste liquor from the oxidation, extraction and washing steps by combustion or thermal decomposition thereby to regenerate the chemicals necessary for the oxidation and extraction steps. The process of the invention produces semi-bleached or completely bleached pulp of high strength with high yield while eliminating the problem relating to environmental pollution.
REFERENCES:
patent: 2169473 (1939-08-01), Olsen
patent: 2805168 (1957-09-01), Bradley, Jr.
patent: 2882965 (1959-04-01), Wayman et al.
patent: 3251730 (1966-05-01), Watanabe
patent: 3269095 (1966-08-01), Brannland
patent: 3296064 (1967-01-01), Cann
patent: 3366534 (1968-01-01), Rapson
patent: 3652387 (1972-03-01), Wilder
patent: 3755068 (1973-08-01), Rapson
Christie, "Present State of the Bleaching Art in Canada", Pulp & Paper Mag. of Canada, June 6, 1969, pp. 59-63.
Bashore S. Leon
Japan Pulp & Paper Research Instutute Inc.
Smith William F.
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