Method of intensifying the washing of a fiber suspension
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United States of America Patent
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Nov 20, 1990
Issued Date -
N/A
app pub date -
Jun 8, 1989
filing date -
Dec 17, 1986
priority date (Note) -
Expired
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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.
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