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:
May. 15, 2001
Filed:
Sep. 23, 1999
Eric Hahn, Eurasburg, DE;
Jürgen Voit, Schondorf a.A., DE;
Linde Aktiengesellschaft, Weisbaden, DE;
Abstract
The invention relates to a process and a liquefier for the production of liquid air with an oxygen content of between 16 and 21 mol % in a low-temperature process, whereby atmospheric air is used as a feed gas; in a warm part of the process, H,O, carbon dioxide and contaminants entrained in the air are removed in a purification step, e.g. adsorption; cold is produced by compression and engine expansion of process streams. Liquid air is obtained as a liquid head product in a cold part of the process by low-temperature rectification in a column having less than four theoretical plates. In addition, a liquid bottoms product is obtained in the rectification, used exergetically and vented as a warm residual gas into the atmosphere or used at least partially in the purification step.