Method for inhibiting calcium salt scale

C - Chemistry – Metallurgy – 02 – F

Patent

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Details

C02F 5/00 (2006.01) C02F 5/12 (2006.01) C02F 5/14 (2006.01) D21C 3/22 (2006.01)

Patent

CA 2447523

Compositions and method for improving inhibition of calcium salt scale formation under the conditions found in chemical pulp processes in which an effective amount of selected phosphonates or phosphonate blends is admixed with the aqueous digester composition in a chemical pulping process during the digestion stage. The compositions and method are especially well suited for use in the Kraft pulping process.

La présente invention concerne des compositions et un procédé qui améliorent la résistance à la formation de dépôts de sels de calcium dans des conditions existant dans des processus de réduction en pâte chimique dans lesquels une quantité efficace de phosphonates sélectionnés ou de mélanges de phosphonates sélectionnés est mélangée à la composition aqueuse du lessiveur dans un processus de réduction en pâte chimique pendant l'étape de fermentation. Les compositions et le procédé sont tout particulièrement adaptés pour être utilisés dans le processus de réduction en pâte kraft.

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