Method and apparatus for optimizing the liquor-to-wood ratio during the production of paper pulp
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United States of America Patent
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Oct 21, 1997
Grant Date -
N/A
app pub date -
Feb 3, 1995
filing date -
Feb 10, 1994
priority date (Note) -
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Abstract
Provided is a method and apparatus which decreases a liquor--to--wood ratio at the top of a continuous digester while increasing a liquor--to--wood ratio in the upstream pre-impregnation vessel. A substantially wood-chip free liquor portion is drawn from the top of the digester through a heater to the bottom of the pre-impregnation vessel through a return conduit. A stream is drawn off the return conduit, upstream of the heater, for transfer to the top of the vessel without mixing with wool chips.
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