Gas separation: processes – Solid sorption – Organic gas or liquid particle sorbed
Reissue Patent
2005-10-25
2005-10-25
Lawrence, Frank M. (Department: 1724)
Gas separation: processes
Solid sorption
Organic gas or liquid particle sorbed
C095S900000, C096S132000, C096S133000, C123S519000
Reissue Patent
active
RE038844
ABSTRACT:
Disclosed is a method for sharply reducing diurnal breathing loss emissions from automotive evaporative emissions control systems by providing multiple layers, or stages, of adsorbents. On the fuel source-side of an emissions control system canister, high working capacity carbons are preferred in a first canister (adsorb) region. In subsequent canister region(s) on the vent-side, the preferred adsorbent should exhibit a flat or flattened adsorption isotherm on a volumetric basis and relatively lower capacity for high concentration vapors as compared with the fuel source-side adsorbent. Multiple approaches are described for attaining the preferred properties for the vent-side canister region. One approach is to use a filler and/or voidages as a volumetric diluent for flattening an adsorption isotherm. Another approach is to employ an adsorbent with the desired adsorption isotherm properties and to process it into an appropriate shape or form without necessarily requiring any special provision for dilution. The improved combination of high working capacity carbons on the fuel source-side and preferred lower working capacity adsorbent on the vent-side provides substantially lower diurnal breathing emissions without a significant loss in working capacity or increase in flow restriction compared with known adsorbents used in canister configurations for automotive emissions control systems.
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Williams, R. S. and C. R. Clontz “Impact and Control of Canister Bleed Emissions” Covington Virginia,Society of Automotive Engineers, Inc.2001.
Hiltzik Laurence H.
Jaqiello Jacek Z.
Tolles Edward Don
Williams Roger S.
Lawrence Frank M.
McDaniel Terry B.
MeadWestvaco Corporation
Reece IV Daniel B.
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