Hydantoin-enhanced halogen efficacy in pulp and paper...

Details Hydantoin-enhanced halogen efficacy in pulp and paper... Hydantoin-enhanced halogen efficacy in pulp and paper...

C - Chemistry, Metallurgy

02

F

C02F 1/50 (2006.01) A01N 59/00 (2006.01) D21H 21/04 (2006.01)

Patent

CA 2202631

Free halogen sources (e.g., sodium hypochlorite and chlorine) added as slimicides in high organic component process streams such as pulp and paper processing are rendered more efficacious by the addition of selected N- hydrogen compounds (namely, 5,5-dimethylhydantoin, 5-ethyl-5-methylhydantoin, cyanuric acid, succinimide, urea, 4,4-dimethyl-2-oxazolidinone, and glycouril) to the process stream. The latter compounds may be added to the process stream before or after the slimicide is added or combined with the slimicide and added directly thereto. The direct use of halogenated hydantoins has also been found to provide improved efficacy relative to free halogen sources. In addition, absorbable organic halogen by-products are reduced.

On obtient une meilleure efficacité des sources d'halogène libre (telles que l'hypochlorite de sodium et le chlore) incorporées sous forme d'agents fongicides à des courants de traitement à teneur élevée en composants organiques, tels que le traitement de la pâte à papier et du papier, en incluant dans le courant de traitement des composés N-hydrogène sélectionnés (à savoir, 5,5-diméthylhydantoïne, 5-éthyl-5méthylhydantoïne, acide cyanurique, succinimide, urée, 4-4-diméthyl-2-oxazolidinone et glycourile). Ces composés peuvent être ajoutés au courant de traitement avant ou après avoir ajouté l'agent fongicide, ou après avoir été combinés à l'agent fongicide et ajoutés directement à celui-ci. L'utilisation directe d'hydantoïnes halogénées améliore l'efficacité par rapport aux sources d'halogène libre. De plus, les sous-produits halogènes organiques absorbables sont réduits.

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