Method of continuous pulping in a digester with high black liquor usage in the impregnation stage
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United States of America Patent
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Jul 20, 1999
Issued Date -
N/A
app pub date -
Aug 5, 1997
filing date -
Nov 15, 1994
priority date (Note) -
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Abstract
The present invention provides a method for continuously cooking kraft pulp in a digester having the steps of: feeding chips into an inlet of a digester; supplying black liquor to an impregnation zone of the digester in an amount such that the black liquor makes up greater than 40% by volume of the total volume of liquid present in the impregnation zone; extracting liquor from a screen girdle downstream of where the black liquor is added to the digester, in the direction the wood chips flow through the digester, in an amount greater than 50% by volume of the total volume of liquor present at the location of the screen girdle; maintaining a liquor:wood ratio in the impregnation zone of greater than 3:1; and discharging cooked pulp from the digester.
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