Method for alkaline delignification of lignocellulosic fibrous material at a consistency which is raised during reaction
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United States of America Patent
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Feb 21, 1989
Issued Date -
N/A
app pub date -
Feb 12, 1986
filing date -
Feb 14, 1985
priority date (Note) -
Expired
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Abstract
A process is disclosed for the pretreatment of lignocellulosic fibrous materials prior to delingification. The process in one of its embodiments is comprised of the following steps: 1. Contacting the pulp material with treated filtrate and alkali for a short reaction period of about 1 to 2 minutes at 40.degree. C., 2. Withdrawing part of the liquid phase by filtration, 3. Displacing substantially all of the remaining liquid phase with treated filtrate, and 4. Allowing the pulp to react under conditions normally used for alkaline extraction or oxygen delignification. The treated filtrate is obtained by subjecting the liquor removed from the pulp at steps 2 and 3 to temperature of 5.degree. to 60.degree. C. for periods of about 5 to 10 minutes. Alternatively, step 3 can be eleminated.
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