Impregnated filter element, and methods
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United States of America Patent
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Issued Date -
Jun 22, 2006
app pub date -
Dec 17, 2004
filing date -
Dec 17, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A contaminant-removal filter for removing carbonyl-containing compounds from a gas stream, such as air. Examples of common airborne carbonyl-containing compounds include ketones, including acetone, and aldehydes, including formaldehyde. The filter has a porous or fibrous body that includes a plurality of passages extending from a first, inlet face to a second, outlet face, the passages providing flow paths. The body has a reactant material impregnated throughout the substrate. The reactant material is a sulfite, bisulfite, oxidant, or derivative of ammonia, specifically high molecular weight and stable amines. Strong alkali (basic) materials are particularly suitable for aldehyde removal. The filter is free of any humectants.
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