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:
Oct. 18, 1994
Filed:
Sep. 15, 1993
Rakesh Agrawal, Emmaus, PA (US);
Bruce K Dawson, Bethlehem, PA (US);
Jeffrey A Hopkins, Whitehall, PA (US);
Jianguo Xu, Fogelsville, PA (US);
Air Products and Chemicals, Inc., Allentown, PA (US);
Abstract
The process of the present invention is a cryogenic air separation process with three important features: (1) at least a portion of a nitrogen-rich liquid from the column system is boosted in pressure before being vaporized and delivered as a product; (2) at least a portion of the feed air is at least partially condensed in indirect heat exchange with the boosted pressure, nitrogen-rich stream; and (3) a portion of the liquid nitrogen condensed from the vapor nitrogen from the top of the higher pressure column is returned to the higher pressure column as reflux with the remaining portion being removed from the column system.