The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 12, 1991
Filed:
May. 26, 1988
Yoshihiro Kusuki, Ichihara, JP;
Kazuhiko Ishihara, Minato, JP;
Ube Industries, Ltd., Yamaguchi, JP;
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.