D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
D21C 3/22 (2006.01) C02F 5/10 (2006.01) C08F 220/06 (2006.01) C08F 220/54 (2006.01) C08F 222/02 (2006.01) D21C 7/12 (2006.01)
Patent
CA 2208936
A scale deposit inhibitor and a method for continuously controlling scale deposition applicable to a digester and its peripheral equipment used in making kraft pulps are disclosed, the scale deposit inhibitor comprising a maleic acid/acrylic acid/2-acrylamido-2-methylpropanesulfonic acid terpolymer having a maleic acid to acrylic acid molar ratio of 10:1 to 10:30, a 2-acrylamido-2-methylpropanesulfonic acid content of 1 to 30 mol%, and a weight-average molecular weight of 500 to 20000. The scale deposit inhibitor is injected to a cooking liquor at concentration of 0.01 to 10 ppm per ppm of a calcium ion in the cooking liquor.
Anti-tartre et méthode pour éliminer en continu le dépôt de tartre dans un digesteur et dans le matériel périphérique employés pour la fabrication de pâtes kraft; l'anti-tartre renferme un terpolymère d'acide maléique/acide acrylique/acide 2-acrylamido-2-méthylpropanesulfonique, avec un rapport molaire acide maléique/acide acrylique de 10/1 à 10/30, une teneur en acide 2-acrylamido-2-méthylpropanesulfonique de 1 à 30 % en moles, et une masse moléculaire moyenne de 500 à 20000. L'anti-tartre est injecté dans une lessive de cuisson à une concentration de 0,01 à 10 ppm par ppm d'ion calcium dans la lessive de cuisson.
Ito Hitoshi
Okamoto Masaru
Hakuto Co. Ltd.
Riches Mckenzie & Herbert Llp
LandOfFree
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