Kraft digesting process wherein a vapor interface is formed by withdrawing hot cooking liquor
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United States of America Patent
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Aug 15, 2000
Grant Date -
N/A
app pub date -
Jun 11, 1997
filing date -
Jun 11, 1997
priority date (Note) -
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Abstract
A method for use in a batch digesting process is provided which includes the removal of a portion of the hot cooking liquor from the digester prior to the cook creating a liquid-vapor interface in the digester followed by the removal or purging of the vapors disposed above the liquid-vapor interface and the reduction of the pressure in the digester to about the saturation pressure of the hot cooking liquor. The inclusion of these steps in the process helps to eliminate a coating on the pulp fibers which has been found to inhibit the bleachability and runability of the fibers. Accordingly, an apparatus and method for the batch digesting of pulp fibers is provided which provides pulp fibers having improved bleachability and runability characteristics.
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