Scale deposit inhibitor for kraft digesters and method for controlling scale deposition in kraft digesters
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United States of America Patent
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Apr 25, 1995
Grant Date -
N/A
app pub date -
Feb 1, 1994
filing date -
Aug 27, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A scale deposit inhibitor and a method for continuously controlling scale deposition applicable to a digester and its peripheral equipment used in kraft pulp manufacture are disclosed, the scale deposit inhibitor comprising a maleic acid-acrylic acid-hypophosphorous acid terpolymer having a maleic acid unit to acrylic acid unit molar ratio of 1:4 to 4:1, a hypophosphorous acid unit content of 1 to 12 mol %, and a weight average molecular weight of 500 to 10000. The scale deposit inhibitor is added to a cooking liquor in a concentration of 0.01 to 10 ppm per ppm of a calcium ion in the cooking liquor.
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