Process for making a very low COD unbleached pulp
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United States of America Patent
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Jul 25, 2006
Grant Date -
Nov 20, 2003
app pub date -
Dec 26, 2002
filing date -
May 15, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for making a pulp product that has a low COD is comprised of soaking and washing pulp in alkaline water for a sufficient time so that the COD after soaking and washing is less than or equal to 2.0 kg/1000 kg of dry pulp. The process includes repetitively soaking and washing an unbleached pulp in alkaline water that is never allowed to drop below pH 7.0. In this process, the pulp is soaked and washed for a total of at least 220 minutes at an elevated temperature to produce the pulp product that has a low COD.
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