Biocidal applications of concentrated aqueous bromine...

A - Human Necessities – 01 – N

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A01N 59/00 (2006.01) A01N 25/02 (2006.01) A01N 25/22 (2006.01) A01N 41/08 (2006.01) A01N 59/08 (2006.01) C02F 1/50 (2006.01) C02F 1/76 (2006.01)

Patent

CA 2383282

Methods for disinfecting surfaces and for sanitizing bodies of water using a single-feed, bromine-based biocide are described. These methods use concentrated liquid biocide compositions comprising biocidally active bromine as the biocide. Also described is a process of producing the concentrated liquid biocide composition: mixed together are (a) bromine chloride and (b) an aqueous solution of alkali metal salt of sulfamic acid having a pH of at least about 7, in amounts such that (i) the active bromine content of the composition is at least about 100,000 ppm (wt/wt), and (ii) the atom ratio of nitrogen to active bromine in the composition is greater than 0.93. Use of bromine chloride as the source of the active bromine in the process is advantageous because in the resulting aqueous compositions, all of the bromine of the bromine chloride is made available as active bromine in solution. In other words, the chlorine of the bromine chloride is converted in the process to dissolved alkali metal chloride salt, thereby liberating all of the bromine as the active bromine content of the biocidal composition.

L'invention concerne des procédés relatifs à la désinfection de surfaces et à l'aseptisation de masses d'eau, qui consistent à utiliser un biocide à base de brome en alimentation unique. Le biocide se présente sous la forme de compositions concentrées liquides renfermant du brome biocide actif. L'invention concerne également un procédé relatif à la production de ce type de composition : le mélange comprend (a) du chlorure de brome (b) une solution aqueuse de sel métallique alcalin d'acide sulfamique dont le pH est au moins égal à 7, dans des quantités telles que (i) la teneur en brome actif de la composition soit au moins égale à environ 100 000 ppm (poids/poids), et (ii) le rapport des atomes entre l'azote et le brome actif dans la composition soit supérieur à 0,93. En l'occurrence, il est avantageux d'utiliser le chlorure de brome comme source de brome actif étant donné que, dans la composition aqueuse résultante, tout le brome issu du chlorure de brome est rendu disponible comme brome actif en solution. On voit donc que le chlorure du chlorure de brome est converti dans le processus en sel de chlorure métallique alcalin dissous, ce qui libère la totalité du brome constituant la teneur en brome actif de la composition biocide.

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