Batch process for preparing pulp
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United States of America Patent
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N/A
Issued Date -
Aug 10, 2006
app pub date -
Dec 22, 2004
filing date -
Dec 31, 2003
priority date (Note) -
Abandoned
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Abstract
According to the invention, polysulfide is used in the manufacture of kraft pulp in the initial stage of a displacement batch process in order to improve the yield. Polysulfide-containing white liquor is added inter-mixed with the first liquor charged to the digester, or as a separate charge before the impregnation liquor is introduced. Preferably, a cooking catalyst, e.g. antraquinone, is added to the white liquor charge as the cooking stage commences.
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