Method for washing pulp in a bleaching line
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United States of America Patent
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Issued Date -
May 4, 2006
app pub date -
Dec 9, 2003
filing date -
Jan 31, 2003
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The method is for bleaching cellulose pulp in a bleaching line that has at least two bleaching steps including a first (D.sub.1) and a second (D.sub.2) bleaching step. The bleaching steps have wash apparatuses (W.sub.4, W.sub.5) for the pulp arranged after the first and the second bleaching step. Wash liquor and where appropriate dilution liquor is led in principle in counter-current to the pulp flow through the bleaching steps in the bleach line (W.sub.1-D.sub.0-W.sub.2-EO/EOP-W.sub.3-D.sub.1-W.sub.4-D.sub.2-W.sub.5). At least one of wash liquor and dilution liquor is taken to the subsequent wash (W.sub.5) of the second bleaching step (D.sub.2) and at least a part of the wash filtrate from the subsequent wash of the second bleaching step is led to a second branch position (A2) in the main conduit.
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