Patent ID: 7374637

Claim:
A method of bleaching cellulose pulp in a bleaching line, comprising: providing a bleaching line having a first wash apparatus; conducting cellulose pulp in a first flow direction through the bleaching line; providing a main conduit having a first branch conduit and a second branch conduit in direct operative engagement with the first wash apparatus; conducting a wash liquor in a second flow direction through the main conduit, the second flow direction being opposite the first flow direction; conveying a first portion of the wash liquor from the main conduit to the first wash apparatus via the first branch conduit and use the first portion of the wash liquor as washing liquor in said first wash apparatus; drawing off a first filtrate from the first wash apparatus; and conveying the first filtrate back to the main conduit via the second branch conduit to the main conduit downstream of the first branch conduit.