D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
D21C 3/22 (2006.01)
Patent
CA 2114692
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.
Inhibiteur de dépôt en couches et méthode pour la limitation en continu du dépôt en couche, utilisé dans un lessiveur et à son équipement périphérique, servant à la fabrication de pâte kraft; l'inhibiteur de dépôt en couches comporte un terpolymère acide maléique-acide acrylique-acide hypophosphoreux ayant un rapport molaire acide maléique-acide acrylique de 1:4 à 4:1, une teneur en acide hypophosphoreux de 1 à 12 % (rapport molaire) et un poids moléculaire moyen de 500 à 10 000. On ajoute l'inhibiteur de dépôt en couches à une lessive de cuisson à une concentration de 0,01 à 10 ppm par ppm d'un ion calcium dans la lessive de cuisson.
Shibata Takanori
Togo Akira
Hakuto Co. Ltd.
Riches Mckenzie & Herbert Llp
LandOfFree
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