Activated peroxide solutions and process for the preparation...

A - Human Necessities – 01 – N

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A01N 59/00 (2006.01) A61L 2/16 (2006.01) A61L 12/12 (2006.01) C11D 3/02 (2006.01) C11D 7/18 (2006.01) C25B 1/30 (2006.01) C01B 15/01 (2006.01)

Patent

CA 2627218

The present invention discloses an activated biocidal aqueous solution containing hydrogen peroxide (activated peroxide solution) obtainable by subjecting an initial solution of hydrogen peroxide in water to a non-thermal electrical discharge process, such as a glow discharge plasma or a corona discharge. The resulting activated peroxide solution containing 0.05 to 20% (w/w) hydrogen peroxide has a pH in the range of 2 to 4, an oxidation- reduction potential (ORP) in the range of 400 to 600 mV, and the solution when having a peroxide content in the range of 0.05% to 0.5% (w/w) has a conductivity in the range of 100 to 500 µSiemens/cm, the solution when having a peroxide content in the range of 0.1% to 5% (w/w) has a conductivity in the range of 100 to 450 µSiemens/cm, and the solution when having a peroxide content in the range of 5% to 20% (w/w) has a conductivity in the range of 100 to 350 µSiemens/cm. The pH, ORP and conductivity are measurable under conditions essentially without the presence of additional compounds in the solution. The biocidal activity of the solution is substantially higher than that of a common peroxide solution. The biocidal solution may be used for any purpose where disinfecting and/or sanitizing and/or cleaning and/or bleaching and/or preservative activity is required. The present invention further discloses a non-thermal electrical discharge process, in particular a pulsed corona induced low frequency pulsed DC plasma discharge process, for the preparation of the activated peroxide solution.

La présente invention concerne une solution aqueuse biocide activée contenant du peroxyde d'hydrogène (solution de peroxyde activée) pouvant être obtenue en soumettant une solution initiale d'hydrogène de peroxyde dans de l'eau à un processus de décharge électrique non thermique, par exemple un traitement au plasma à décharge électroluminescente ou de décharge par effet de couronne. La solution de peroxyde activée contenant de 0,05 à 20 % (w/w) de peroxyde d'hydrogène présente un pH de 2 à 4, un potentiel d'oxydo-réduction (ORP) de 400 à 600 mV, et, lorsqu'elle présente un contenu en peroxyde de 0,05 % à 0,5 % (w/w), la solution présente une conductivité de 100 à 350 ?Siemens/cm. Le pH, l'ORP et la conductivité peuvent être mesurés dans des conditions essentiellement sans la présence de composés supplémentaires dans la solution. L'activité biocide de la solution est sensiblement supérieure à celle d'une solution de peroxyde commune. La solution biocide peut être utilisée dans n'importe quel usage nécessitant une activité de désinfection et/ou d'assainissement et/ou de nettoyage et/ou de blanchiment et/ou de préservation. La présente invention concerne également un processus de décharge électrique non thermique, en particulier un processus de décharge au plasma c.c. pulsé à faible fréquence induit par effet de couronne pulsé, pour la préparation de la solution de peroxyde activée.

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