Recovery of methane from land fill gas
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United States of America Patent
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Sep 13, 1988
Issued Date -
N/A
app pub date -
Sep 3, 1987
filing date -
May 16, 1986
priority date (Note) -
Expired
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Abstract
High purity methane and carbon dioxide are recovered from landfill gas in an integrated multi-column adsorption system having a temperature swing adsorption section (TSA) for pretreatment of the crude landfill gas to remove trace impurities therefrom, the thus cleaned gas being fed to a pressure swing adsorption section (PSA) for bulk separation of CO.sub.2 from methane. Regeneration of the impurity-laden adsorbent bed of the TSA section is carried out using part of the CO.sub.2 product gas recovered from the PSA section which gas is heated to thermal regeneration temperature.
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