METHOD FOR PRODUCING CELLULOSE PULP IN A CONTINUOUS DIGESTER IN AN ENERGY-EFFICIENT MANNER
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United States of America Patent
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Issued Date -
Sep 4, 2008
app pub date -
Dec 10, 2007
filing date -
Dec 13, 2006
priority date (Note) -
Abandoned
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Abstract
The method is for producing cellulose pulp in a continuous digestion system in an energy-efficient manner. Cellulose chips are fed continuously with a transfer liquid in a transfer line to a top separator arranged at the top of a digester, for the separation of free liquid from the cellulose chips. The top separator has a withdrawal space in which free liquid collects. At least a fraction of the free liquid that has separated, with a temperature T.sub.out, is led in a return line from the withdrawal space of the top separator to a position to be used as transfer liquid. At least one pressurised withdrawal of black liquor is carried out in the digester essentially at the cooking temperature of at least 135.degree. C. An additive liquid with a temperature T.sub.in is added at the withdrawal space of the top separator, where the temperature T.sub.in is greater than the temperature T.sub.out.
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