Method for kraft pulp production where hemicelluloses are returned
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United States of America Patent
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Sep 25, 2012
Grant Date -
May 5, 2011
app pub date -
Dec 16, 2008
filing date -
Dec 20, 2007
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The method increases the yield and improves the beatability of kraft pulp. During the progression of the cooking process, more than one cooking liquor with a dissolved content of hemicellulose is drawn off and then reintroduced to the last phases of the cooking process, to re-precipitate the hemicellulose on the fibers. The hemicellulose rich cooking liquors are adjusted so that they, upon being added to the last phase of the cooking process are optimized. Early dissolved hemicellulose has a longer chain length than the hemicellulose that dissolves in the cooking liquor in the later phases of the cooking process, and they also have different tendencies to precipitate on the wood chips softened in the cooking process.
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