Method of bleaching cellulose pulp with a main conduit for wash liquor and filtrate
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United States of America Patent
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May 20, 2008
Grant Date -
May 4, 2006
app pub date -
Nov 16, 2005
filing date -
Jan 13, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
The method is for bleaching cellulose pulp in a bleach line that has at least two bleaching steps. The filtrate distribution is led up through the bleaching line counter-currently to the flow of cellulose pulp established in the bleaching line. A single joint main conduit is used for the bleaching steps. Wash filtrates obtained from the wash steps, used after or before the bleaching step, are led in conduits to branch locations on the main conduit that are positioned downstream of the branch location for drawing off of wash and/or dilution liquor for the wash step in question. All branch points in the joint main conduit are in fluid communication with one another along the main conduit.
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