HARDWOOD ALKALINE PULPING PROCESSES AND SYSTEMS
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United States of America Patent
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Issued Date -
Dec 6, 2012
app pub date -
Aug 10, 2012
filing date -
Apr 13, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Systems are provided for continuously producing chemical cellulose pulp from a slurry of comminuted hardwood material by subjecting the slurry of comminuted hardwood material to a first cooking stage under conditions sufficient to reduce syringyl lignin (s-lignin) content in the hardwood material as compared to guaiacyl lignin (g-lignin) content therein, and thereafter subjecting the slurry of comminuted hardwood material to a second cooking stage under conditions sufficient to reduce the g-lignin content remaining therein after the first cooking stage.
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