Chemical filter
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United States of America Patent
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N/A
Issued Date -
Aug 2, 2007
app pub date -
Apr 22, 2004
filing date -
Apr 24, 2003
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A chemical filter, characterized in that it uses, as an adsorption layer, an organic porous ion exchanger which has an open pore structure wherein a meso pore having an average diameter of 5 to 1,000 .mu.m is formed in the wall between a macro pore and a macro pore connected with each other, has a total pore volume of 1 to 50 ml/g, has ion-exchange groups being uniformly distributed, and has an ion-exchange capacity of 3.0 mg equivalent/g-dry porous material or more. The chemical filter can maintain the capacity of adsorbing and removing a gaseous contaminant even at an enhanced gas transmission rate, and can remove also a trace amount of a gaseous contaminant.
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