Treatment of cellulose material with additives while producing cellulose pulp
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United States of America Patent
Stats
-
Jun 5, 2001
Grant Date -
N/A
app pub date -
Feb 10, 1999
filing date -
Mar 3, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Chemical cellulose pulp (e.g. kraft pulp) is produced with enhanced strength and/or yield using a strength or yield enhancing additive such as polysulfide or anthraquinone or its equivalents or derivatives, and in a manner that allows effective recovery/reuse of the additive so as to make the process more economical. In a continuous digester a low temperature and relatively low alkalinity protecting zone is provided at the top of the digester terminating with a first screen, and a second screen is provided below the first screen. Between the first and second screens, prior to bulk delignification, a first counter-current zone is provided, and additive-containing liquid from the first screen is recirculated to the slurry at or near the digester inlet to enhance yield or strength.
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