Method of intensifying the washing of a fibre suspension

D - Textiles – Paper – 21 – C

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9/2, 9/34

D21C 9/02 (2006.01) D21C 3/22 (2006.01) D21D 1/40 (2006.01)

Patent

CA 1294091

Abstract Method of intensifying the washing of a fibre suspension The present invention relates to a method of intensifying the washing of a fibre suspension. In particular the present invention relates to decreasing the lignin content of a fiber suspension by extracting. Lignin removal is usully 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 temperatu- re. P513HENR/EN1WP

554459

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