A process to manufacture stabilized alkali or alkaline earth...

C - Chemistry – Metallurgy – 01 – B

Patent

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C01B 11/20 (2006.01) C02F 1/50 (2006.01) C02F 1/76 (2006.01) C11D 3/395 (2006.01) C11D 3/48 (2006.01)

Patent

CA 2263266

The invention is a method for preparing a stabilized aqueous alkali or alkaline earth metal hypobromite solution. The method comprises the steps of: a. Mixing an aqueous solution of alkali or alkaline earth metal hypochlorite having from about 5 percent to about 70 percent available halogen as chlorine with a water soluble bromide ion source; b. Allowing the bromide ion source and the alkali or alkaline earth metal hypochlorite to react to form a 0.5 to 70 percent by weight aqueous solution of unstabilized alkali or alkaline earth metal hypobromite; c. Adding to the unstabilized solution of alkali or alkaline earth metal hypobromite an aqueous solution of an alkali metal sulfamate in a quantity to provide a molar ratio of alkali metal sulfamate to alkali or alkaline earth metal hypobromite is from about 0.5 to about 7; and, d. Recovering a stabilized aqueous alkali or alkaline earth metal hypobromite solution.

L'invention concerne un procédé de préparation d'une solution aqueuse, stabilisée, d'hypobromite de métal alcalin ou alcalino-terreux, lequel comprend les étapes consistant: a) à mélanger une solution aqueuse d'un hypochlorite de métal alcalin ou alcalino-terreux possédant environ 5 à environ 70 % d'halogène disponible en tant que chlore, avec une source d'ions bromure hydrosoluble; b) à permettre à cette source d'ions et à l'hypochlorite de réagir, afin de former 0,5 à 70 % en poids d'une solution aqueuse non stabilisée d'hypobromite de métal alcalin ou alcalino-terreux; c) à ajouter à cette solution non stabilisée d'hypobromite une solution aqueuse d'un sulfamate de métal alcalin en quantité nécessaire pour obtenir un rapport molaire sulfamate de métal alcalin/hypobromite de métal alcalin ou alcalino-terreux qui soit compris entre environ 0,5 et 7; et d) à récupérer une solution aqueuse et stabilisée d'hypobromite de métal alcalin ou alcalino-terreux.

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