Filter materials for adsorbing hydrocarbons
AssigneeFoamex Innovations Operating Company
InventorsJeffrey I. Lebowitz, Joseph W. Lovette, Chiu Y. Chan
Life of this patent
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Abstract
A porous filter medium forms a filter or liner for extracting hydrocarbons from vapors emitted from a motorized vehicle, device or appliance fuel tank. The filter medium is a polymer network of a foam, nonwoven or collection of particles and has fine pore size and a butane working capacity (W/W %) of 4.0 percent or higher.
Claims18
A method for removing hydrocarbons from a gaseous stream emitted from a fuel tank during refueling of a motor vehicle, device or appliance with a hydrocarbon-based fuel consuming engine, comprising:
- installing a filter in a flow path established between the fuel tank and an exhaust from the fuel tank, wherein said filter comprises two or more foam blocks aligned in stacked relation within a canister, and wherein the foam forming said blocks has a pore count between about 45 and 300 pores per inch and has been coated with an adsorbent particle coating, and further wherein each foam block defines at least one channel having a channel axis extending in the direction of the flow path formed therein through which a gas may flow and said channels of adjacent foam blocks are substantially axially aligned.
A system for extracting evaporative hydrocarbon emissions from a motorized vehicle, device or appliance, comprising:
- a housing defining an inner chamber;
- an inlet through which a gas stream containing a hydrocarbon enters the inner chamber;
- an outlet from which a gas stream exits the inner chamber;
- and
- a filter in the inner chamber, said filter comprising two or more foam blocks that are aligned in stacked relation within the inner chamber, wherein the foam forming said blocks has a pore count between about 45 and 300 pores per inch and has been coated with an adsorbent particle coating, and further wherein each foam block defines at least one channel having a channel axis extending in the direction of the flow path formed therein through which a portion of the gas stream may flow and said channels of adjacent foam blocks are substantially axially aligned.
Dependencies are inferred from the claim text.