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:
Mar. 06, 2001
Filed:
Jul. 20, 1999
Naohiko Yamashita, Hyogo-ken, JP;
Takao Yamamoto, Hyogo-ken, JP;
Abstract
An object of the present invention is to provide a method for recovering a gas using a semipermeable membrane in an apparatus having a simple structure. The method is capable of maintaining a purity of a product gas at a constant value even if a feed amount of a feed stream is fluctuated. A feed stream G,is a gas mixture of a fast gas having a relatively high permeability to a membrane,and a slow gas having a relatively low permeability to the membrane,The feed stream G,is pressurized by a compressor,and fed to a membrane,separation unit,having the membrane,. Part G,of the permeate stream on the permeate side of the membrane,is recirculated to the upstream side of the compressor,through the first recirculation line,and merged into a stream of the feed stream G,Simultaneously, another part of the permeate stream G,on the permeate side of the membrane,is recovered through a product gas recovering line,In this manner, a product gas G,having a fast gas increased in concentration is obtained.