Method to reduce fuel vapor emissions
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United States of America Patent
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Feb 22, 1994
Grant Date -
N/A
app pub date -
Aug 28, 1992
filing date -
Aug 28, 1992
priority date (Note) -
Expired
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Abstract
Hydrocarbon emissions from fuel reservoirs, particularly those associated with motor vehicles, are abated by contacting a vented hydrocarbon fuel vapor stream from the reservoirs with a polymeric adsorbent derived from a macroporous or macroreticular copolymer of at least one monovinylidene aromatic monomer and a crosslinking monomer. The macroporous copolymers are converted into suitable adsorbents by post-polymerization crosslinking in a swollen state in the presence of a Friedel-Crafts catalyst. The resulting adsorbent has improved hydrocarbon adsorption capacity relative to conventional activated carbon adsorbents.
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