Method of producing pulp with high alkali cooking in the last co

Details Method of producing pulp with high alkali cooking in the last co Method of producing pulp with high alkali cooking in the last co

1997-08-18

1999-03-23

Silverman, Stanley S.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Continuous chemical treatment or continuous charging or...

162 39, 162 45, D21C 326

Patent

active

058854142

ABSTRACT:
A method and device for cooking pulp by increasing the effective alkali concentration in the residual phase of the cooking process to substantially improve the residual delignification rate and thus improving the pulp properties such as the pulp strength and pulp yield at a given lignin content.

REFERENCES:
patent: 2639987 (1953-05-01), Sloman
patent: 4578149 (1986-03-01), Fagerlund
patent: 4690731 (1987-09-01), Hartler et al.
patent: 5066362 (1991-11-01), Meredith
patent: 5183535 (1993-02-01), Tikka
patent: 5522958 (1996-06-01), Li
patent: 5635026 (1997-06-01), Kettunen et al.
Paper and Timber vol. 79/No. 4/1997; "Effect of cooking stage EA concentration profiles on softwood kraft pulping" by Kettunen, Ramark, Kimmo Harsia, and Kaj Henricson, pp. 232 through 234, and 236 through 239.
Svensk papperstidning nr 15 1978; "Extended delignification in kraft cooking--a new concept" by Nils Hartler; pp. 483 and 484.
Kettunen et al. "Effect of Cooking . . . kraft Pulping", Paper and Timber, vol. 79, pp. 232-239, Apr. 1997.

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