Concentrated aqueous bromine solutions and their preparation

Details Concentrated aqueous bromine solutions and their preparation Concentrated aqueous bromine solutions and their preparation

A - Human Necessities

01

N

A01N 59/00 (2006.01) A01N 25/22 (2006.01) C01B 7/09 (2006.01) C01B 7/24 (2006.01) C02F 1/50 (2006.01) C02F 1/76 (2006.01)

Patent

CA 2430833

Concentrated liquid biocide compositions are produced by: A) feeding (a) bromine atoms and chlorine atoms in the form of (i) one or more of BrCl, (ii) Br2, and (iii) Cl2 into (b) water containing sulfamate anions, or feeding each of (a) and (b) into a reaction vessel, such that the numerical ratio of the total number of bromine atoms fed to the total number of chlorine atoms fed is in the range of 0.7:1 to 1.7:1; and B) providing enough alkali metal base in the mixture being formed in A) to keep the pH of such mixture in the range of 7-11 during all or substantially all of time feeding in A) is occurring, the amounts of (a) and (b) used being amounts that form an active-bromine- containing solution in which (i) the active bromine content is 50,000 ppm or more, and (ii) the atom ratio of nitrogen to active bromine originating from (a) and (b) is greater than about 0.93; and wherein if any sulfate is present in the solution as formed, the molar ratio of sulfate to sulfamate in the solution is less than about 0.2.

L'invention concerne des compositions biocides liquides concentrées dont la préparation comprend les étapes suivantes: A) on introduit (a) des atomes de brome et des atomes de chlore sous forme de (i) BrCl, et/ou (ii) Br¿2?, et/ou (iii) Cl¿2? dans (b) de l'eau contenant des anions sulfamate, ou on introduit (a) et (b) dans une cuve de réaction de manière que le rapport numérique entre le nombre total d'atomes de brome et le nombre total d'atomes de chlore introduits dans la cuve se situe entre 0,7:1 et 1,7:1; et B) on ajoute suffisamment de base de métal alcalin au mélange obtenu dans l'étape (A) pour maintenir le pH du mélange dans un intervalle de 7-11 pendant toute la durée ou sensiblement toute la durée de l'étape A). Les quantités de (a) et de (b) utilisées sont des quantités permettant de former une solution contenant du brome actif dans laquelle (i) la proportion de brome actif est égal ou supérieur à 50,000 ppm, et (ii) le rapport atomique entre l'azote et le brome actif résultant de (a) et de (b) est supérieur à environ 0,93, et au cas ou un sulfate quelconque est présent dans la solution formée, le rapport molaire entre le sulfate et le sulfamate contenus dans la solution est inférieur à environ 0,2 .

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