Shelf life improvement for ethylene oxide sterilant mixes

A - Human Necessities – 01 – N

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A01N 43/20 (2006.01) A61L 2/20 (2006.01)

Patent

CA 2234940

A method of increasing the shelf life of a sterilant mixture of ethylene oxide and one or more halocarbons when the mixture is in contact with iron oxide on the surface of a storage vessel. Sufficient carbon dioxide is added to the mixture to reduce the reactivity of the iron oxide for converting ethylene oxide to reaction products of ethylene oxide. In an alternate embodiment, a hollow carbon steel vessel which holds a mixture of ethylene oxide and a halocarbon as a sterilizing gas has its inside surface passivated by forming a reaction product of iron oxide and carbon dioxide.

L'invention concerne un procédé visant à accroître la durée de conservation d'un mélange stérilisateur composé d'oxyde d'éthylène et d'au moins un carbone halogéné, ledit mélange étant en contact avec de l'oxyde de fer se trouvant à la surface du récipient. On ajoute au mélange une quantité suffisante de dioxyde de carbone afin de réduire la réactivité de l'oxyde de fer, et de convertir l'oxyde d'éthylène en produits réactionnels d'oxyde d'éthylène. Dans un autre mode de réalisation, la surface intérieure d'un récipient creux d'acier au carbone, contenant un mélange d'oxyde d'éthylène et un carbone halogéné comme gaz de stérilisation, est passivée grâce à la formation d'un produit réactionnel d'oxyde de fer et de dioxyde d'éthylène.

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