Process for delignification of lignocellulosic material in the p

Details Process for delignification of lignocellulosic material in the p Process for delignification of lignocellulosic material in the p

1982-03-18

1986-03-04

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

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

162 72, 162 82, D21C 302, D21C 320, D21C 326, D21C 1100

Patent

active

045740321

ABSTRACT:
A method of introducing anthraquinone into the kraft pulping process for the delignification of lignocellulosic material by dissolving or homogeneously dispersing the anthraquinone in a mixture of from about 10% to about 50% white kraft pulping liquor and, correspondingly, from about 90% to about 50% black kraft pulping liquor and then blending this solution with the white liquor feed into the pulping digesters.

REFERENCES:
patent: 4012280 (1977-03-01), Holton
patent: 4127439 (1978-11-01), Fujii et al.
patent: 4178861 (1979-12-01), Vanderhoek et al.
patent: 4213867 (1980-07-01), Vanderhoek
"Kraft Pulping with Anthraquinone," H. H. Holton and F. L. Chapman, Tappi, vol. 60, No. 11, 121-5 (1977).
"Soda Additive Softwood Pulping: A Major New Process," H. H. Holton, Pulp and Paper Canada, vol. 78, No. 10, T 218-23 (1977).
"Soda Pulping with Anthrahydroquinones," T. J. Fullerton, Appita, vol. 32, No. 2, 117-8 (1978).

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