Method of preparing high purity light gas by multiple-step gas separation
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United States of America Patent
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Nov 12, 1991
Grant Date -
N/A
app pub date -
May 26, 1988
filing date -
May 29, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A purified light gas consisting of hydrogen or helium and having a high purity of, for example, 99.99% or more is prepared from a feed gas containing at least 90 molar % or more of H.sub.2 or He and substantially no CO.sub.2 by gas-separating the feed gas through a plurality of gas-separating membrane modules each comprising at least one polymeric gas-separating membrane and having a gas-permeating ratio P.sub.A /P.sub.CH4 of 100 or more, wherein P.sub.A is a permeating rate of the light gas and P.sub.CH4 is a permeating rate of methane gas, in such a manner that each fraction of the feed gas permeated through and delivered from a preceding membrane module is fed to a next membrane module under the pressure, per se, of the delivered fraction of the feed gas without pressurizing the delivered fraction.
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