Method in connection with the pretreatment of comminuted fibrous material
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United States of America Patent
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Dec 25, 2001
Grant Date -
N/A
app pub date -
Dec 17, 1999
filing date -
Jun 25, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method in connection with the pretreatment of comminuted fibrous material intended for chemical cellulose pulp production. The fibrous material is fed through a low pressure system that has a gas phase part followed by a liquid phase part. The liquid phase part includes a low pressure circulation where a circulating liquid is withdrawn from the fibrous material and recirculated back to the fibrous material in an upstream position. The fibrous material is sluiced into a high pressure system that has a liquid phase transfer part operatively connected to a digester. A hot process liquid and/or the circulating liquid are evaporatively cooled by being allowed to flash within the low pressure system.
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