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:
Apr. 24, 2001
Filed:
Jan. 27, 2000
Thomas Rathbone, Farnham, GB;
The BOC Group plc, Windlesham, GB;
Abstract
Air is separated in a main rectification column comprising a higher pressure column, a lower pressure column and a condenser-reboiler replacing the higher pressure column in heat exchange relationship with the lower pressure column. A first liquid oxygen fraction concentrated in krypton and xenon is formed at the bottom of the lower pressure column and is withdrawn through outlet. Argon-oxygen separation takes place in the column and a vaporous argon-oxygen stream depleted of krypton and xenon is taken from the outlet as it is subjected to further rectification in a column, a second liquid oxygen fraction containing argon impurity being obtained. A stream of the second liquid oxygen fraction is withdrawn from the column through the outlet and is purified in the column so as to obtain a purified oxygen product.