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:
Apr. 30, 1999
Horst Corduan, Puchheim, DE;
Dietrich Rottmann, Munich, DE;
Juergen Voit, Schondorf, DE;
Christian Kunz, Munich, DE;
Wolfgang Haag, Munich, DE;
Linde Aktiengesellschaft, Wiesbaden, DE;
Abstract
The process and the apparatus serve to produce pressurized nitrogen by low-temperature fractionation of air in a rectification system which has a pressure column (,) and a low-pressure column (,). Feed air (,) is passed into the pressure column (,). An oxygen-containing liquid fraction (,) is taken off from the pressure column (,) and fed into the low-pressure column (,). Gaseous nitrogen (,) from the low-pressure column (,) is at least partially condensed in a top condenser (,) by indirect heat exchange with an evaporating liquid (,). Nitrogen from the low-pressure column is produced as gaseous pressurized nitrogen product (,) at a pressure which is higher than the operating pressure of the low-pressure column (,). Liquid nitrogen (,) withdrawn from the low-pressure column is brought (,) in the liquid state to a pressure which exceeds the pressure of the low-pressure column (,). The pressurized liquid (,) is evaporated in a product evaporator (,) by indirect heat exchange with a heat-transfer medium (,) and is subsequently produced as gaseous pressurized nitrogen product (,). (FIG.,)