Particle loaded membranes as oxidant scavengers
AssigneeMinnesota Mining and Manufacturing Company
InventorsDonald F. Hagen, Kenneth M. Hart, Glenn D. Johnson
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Abstract
An efficient method removes oxidants from fluids (gases and liquids, particularly air) by means of solid phase extraction or reaction. The solid phase extraction or reaction medium comprises a porous, preferably fibrous, polymeric, membrane or web in which are incorporated oxidant scavenger particulates. Typical oxidants removed in the method include ozone, oxides of nitrogen, halogen, and peroxides. The method of the invention protects organic analytes in analytical applications and removes oxidants in remediation applications by use of oxidant scavenger particles in porous membranes.
Claims23
A method for removing an oxidant from a fluid comprising the step of passing a fluid including said oxidant through at least one solid phase reaction article comprising a porous membrane having incorporated therein an antioxidant, said antioxidant consisting essentially of oxidant scavenger particulates which react chemically in an oxidation-reduction reaction with said oxidant, said oxidant scavenger particulates being selected from the group consisting of 1) polymeric organic particulates or derivatives thereof having readily oxidizable sites, and inert particulates coated with said polymers, and 2) inorganic coated particulates having coatings selected from the group consisting of potassium iodide, sodium thiosulfate, potassium iodide+sodium thiosulfate, and Indigo Blue, said oxidant being active towards organic compounds.
A solid phase reaction article comprising a porous membrane having incorporated therein an antioxidant, said antioxidant consisting essentially of oxidant scavenger particulates which react chemically in an oxidation-reduction reaction with an oxidant, said oxidant scavenger particulates being selected from the group consisting of 1) polymeric organic particulates or derivatives thereof having readily oxidizable sites, and inert particulates coated with said polymers, and 2) inorganic coated particulates having coatings selected from the group consisting of potassium iodide, sodium thiosulfate, potassium iodide+sodium thiosulfate, and Indigo Blue, wherein said particulates have been reacted with the oxidant selected from the group consisting of ozone, oxides of nitrogen, halogens, and peroxides, to produce an oxidized form of said scavenger particulates.
Dependencies are inferred from the claim text.