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. 29, 2002
Filed:
Mar. 19, 2001
Dietrich Rottmann, Munich, DE;
Christian Kunz, Munich, DE;
Linde Aktiengesellschaft, Wiesbaden, DE;
Abstract
For obtaining gaseous nitrogen by low-temperature separation from air, a distillation column system has a single column ( ). Compressed air ( ) is cooled in a main heat exchanger ( ) and fed ( ) to single column ( ). A nitrogen-rich fraction ( ) is drawn off from the distillation column system and compressed at least in part in a circulation compressor ( ). A first part ( ) of nitrogen-rich fraction ( ) is fed downstream from circulation compressor ( ) to the liquefaction chamber of a condenser-evaporator ( ) and is condensed under a pressure higher than the operating pressure of single column ( ), so to form nitrogen-rich liquid ( ). A liquid oxygen-enriched fraction ( ) from the distillation column system is at least partially evaporated in the evaporation chamber of condenser-evaporator ( ). A first oxygen-enriched gas ( ) formed in the evaporation chamber of condenser-evaporator ( ), is introduced into single column ( ). A second portion ( ) of the nitrogen-rich fraction ( ) is drawn off at least at times as gaseous nitrogen product. A second oxygen-enriched gas ( ) is removed from the evaporation chamber of condenser-evaporator ( ), work expanded ( ), and heated in main heat exchanger ( ).