Batch process for producing chemical pulp by removing and reintroducing calcium-containing spent liquor in the digester
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United States of America Patent
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Sep 6, 2005
Grant Date -
N/A
app pub date -
Oct 4, 2000
filing date -
Oct 4, 1999
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Methods for producing chemical pulp from lignocellulose-containing material in processes for kraft pulp production are disclosed including charging the lignocellulose-containing material to a digester, initially treating the lignocellulose-containing material with an impregnation liquor, and then treating the impregnated lignocellulose-containing material with hot liquor and displacing calcium-containing spent liquor from the digester during that treatment, heating and cooking the heated lignocellulose-containing material to produce cooked lignocellulose-containing material and cooking liquor and displacing the cooking liquor from the digester using at least a portion of the displaced calcium-containing spent liquor.
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