High sulfidity cook for paper pulp using black liquor sulfonization of steamed chips
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United States of America Patent
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-
Oct 1, 1991
Grant Date -
N/A
app pub date -
Jun 28, 1989
filing date -
Jun 28, 1989
priority date (Note) -
Expired
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Abstract
A method and apparatus provide for the continuous digestion of comminuted cellulosic fibrous material (e.g. wood chips) to produce paper pulp, with increased sulfidity. When black liquor is withdrawn from the continuous digester, instead of merely passing it to a pair of flash tanks and then to recovery, the concentrated liquor from a first flash tank is fed to a vessel in which the comminuted material is slurried with a liquid. Since the black liquor remains in intimate contact with the chips for a significant period of time, the lignin in the chips is partly sulfonized. Ultimately the black liquor is replaced with white liquor or the like, and the separated out black liquor is circulated to recovery or disposal. A high pressure feeder and a solids/liquid separator are utilized.
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