Scale deposit inhibitor for kraft digesters and method for contr

Details Scale deposit inhibitor for kraft digesters and method for contr Scale deposit inhibitor for kraft digesters and method for contr

1994-02-01

1995-04-25

Jones, W. Gary

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With cleaning, preserving or conditioning of apparatus

162 76, 162 80, 210698, 210701, D21C 714

Patent

active

054095719

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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