Process for preparing a bleached chemithermomechanical pulp

Details Process for preparing a bleached chemithermomechanical pulp Process for preparing a bleached chemithermomechanical pulp

1992-10-06

1994-08-16

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Chemical treatment after start or completion of mechanical...

162 25, 162 26, 162 78, 162 80, 162 83, 162 84, D21C 314, D21C 916, D21B 116

Patent

active

053384024

ABSTRACT:
A process for preparing chemithermomechanical pulp comprising subjecting a lignocellulosic substance from which said pulp is to be formed to the simultaneous action of a sulfite and a reducing agent that is more electronegative than the sulfite ion during a nondestructive cooking operation at a temperature of about 100.degree. C. or above under saturated steam pressure; said simultaneous action taking place at an initial pH of between 7 and 12.5.

REFERENCES:
patent: 3284283 (1966-11-01), Kindron et al.
patent: 3384535 (1968-05-01), Kindron et al.
patent: 3507743 (1970-04-01), Cartsunis et al.
patent: 3933676 (1976-01-01), Wade
patent: 3981765 (1976-09-01), Kruger et al.
Tappi Journal, vol. 68, No. 2, Feb. 1983, pp. 64-68.
Abstracts Bulletin of The Inst. of Paper Chemistry, vol. 48, No. 11, May 1978, p. 1187, Abst. 11.703.
Kutney, "Sulphur Dioxide and Its Derivatives: The Forgotten Bleaching Chiemcals", J. Pulp & Paper Sci, vol. 12, No. 2, pp. 44-49; Mar. 1986.
Rydholm; Pulping Processes, Interscience Publishers, N.Y. 1967 pp. 473-475.

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