Delignification and bleaching of lignocellulosic pulp via photo-

Details Delignification and bleaching of lignocellulosic pulp via photo- Delignification and bleaching of lignocellulosic pulp via photo-

1980-03-21

1981-10-13

Chin, Peter

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Utilizing electrical or radiant energy

162 65, D21C 500, D21C 910

Patent

active

042946549

ABSTRACT:
A process for the delignification and bleaching of lignocellulosic pulp employing electronically excited oxygen generated in situ which comprises subjecting an aqueous slurry of said lignocellulosic pulp having a consistency of from about 0.01% to about 10.0%, by weight of oven-dried pulp, and whose slurry pH is between about 8 and about 13 to irradiation with ultraviolet light while admitting oxygen into said slurry.

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Berge et al., ATIP Rev., 30, No. 5, (1976), 161-166.
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Gellerstedt et al., ACTA Chem. Scand., 29B, No. 10, (1975) 1005-1010.
Carlsson et al., J. Polymer Sci., (B. Polymer Letters), 14, No. 8 (1976), 493-498.
Gellerstedt et al., "Singlet Oxygen Oxidation of Lignin Structures", Canadian Wood Chem. Symp. (Mont Gabriel, Quebec).
Meshitsuka et al., TAPPI, 59, No. 11 (1976), 123-125.
Markham, TAPPI, 60, No. 9 (1977), 138-140.
Nimz et al., "Oxidation of Lignin Model Compounds with Hydrogen Peroxide, Peracetic Acid and Singlet Oxygen", 11th European ESPRA Meeting, May 1979.

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