Method of intensifying the washing of a fiber suspension

Details Method of intensifying the washing of a fiber suspension Method of intensifying the washing of a fiber suspension

1989-06-08

1990-11-20

Chin, Peter

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Defibration by projection or explosion

162 52, 162 60, D21B 136, D21C 902

Patent

active

049716581

ABSTRACT:
The present invention relates to a method of intensifying the washing of a fiber suspension. In particular, the present invention relates to decreasing the lignin content of a fiber suspension by extracting. Lignin removal is usually carried out at a consistency of less than 3% whereby heating consumes much energy. The method of the invention allows a considerable increase in the consistency of the suspension which results in that the energy consumption is decreased to a fraction of the one required by prior art methods. A characteristic feature of the method of the invention is that dry substance and chemicals contained in the fibers are extracted at a raised pressure and temperature.

REFERENCES:
patent: 2355091 (1944-08-01), McDonald
patent: 3294623 (1966-12-01), Brinkley et al.
patent: 4595456 (1986-06-01), Andersson
patent: 4705600 (1987-11-01), Jacobsen
Crotogino et al., "the Principles of Pulp Washing", Tappi, Jun. 1987, pp. 95-103.

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