Method for producing chemical pulp from hardwood chips
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United States of America Patent
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-
May 9, 1995
Grant Date -
N/A
app pub date -
Apr 5, 1993
filing date -
Apr 5, 1993
priority date (Note) -
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status (Latency Note)
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Abstract
Chemical pulp is produced from hardwood chips in a simplified manner utilizing a continuous digester. An inverted top separator is provided in the circulatory loop between the high pressure feeder and the top of the continuous digester for thermally isolating circulations on either side of the inverted top separator. Relatively cool liquor circulates between the inverted top separator and high pressure feeder, at a temperature such that it will not flash into steam in a high pressure feeder, while in the circulatory loop from the high pressure feeder to the digester the chips are in cooking liquor at cooking temperature. Since hardwood chips require less cooking than softwood chips, a single heating source for heating the liquor to cooking temperature is provided, external of the digester, and a conventional cooking circulation loop within the digester is not required.
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