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:
Jun. 13, 2000
Filed:
Oct. 09, 1998
David Miller Espie, Lansdale, PA (US);
Air Products and Chemicals, Inc., Allentown, PA (US);
Abstract
The present invention concerns a cryogenic air separation process which intermittently diverts a portion of the air feed as repressurization gas for a front-end two bed pressure swing adsorption adsorption system which system is used to remove impurities from the air feed. In particular, the present invention is an improvement to said process for at least partially eliminating reductions in the purity of the product streams from the air separation unit caused by the intermittent diversions of the air feed as repressurization gas. The improvement comprises reducing the flow of both the nitrogen-enriched waste stream and the crude liquid oxygen stream from the air separation unit during those intermittent periods when repressurization gas is required in the pressure swing adsorption system.