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:
Jul. 04, 1995
Filed:
Dec. 16, 1993
Norbert Rieth, Paris, FR;
Abstract
Process and installation for the production of gaseous oxygen and/or gaseous nitrogen under pressure and of at least one liquid product by an installation comprising a single air distillation column (9) provided with a nitrogen refrigeration cycle. The air to be treated is compressed (in 1) to a first pressure at least equal to the pressure of the single column. At least a portion of the air is further compressed (in 4; 4, 4A) to a high pressure substantially greater than the pressure of the single column. A fraction of this air is condensed (in 7) by vaporization of liquid oxygen and/or liquid nitrogen withdrawn from the base of the column and pumped (in 14, 15) to the corresponding vaporization pressure. The gaseous oxygen and/or gaseous nitrogen is recovered (in 30, 28) under the resulting pressure, as product. The air thus condensed is subcooled (in 11), expanded to about the pressure of the column (in 20, 21), and introduced at least in part into an intermediate level of the column. The air not used to vaporize the liquid oxygen and/or liquid nitrogen is expanded to the pressure of the column, with the production of external work (5, 5A); and there is withdrawn from the installation at least one liquid which is recovered as product.