Patent ID: 6327873
Filing Date: 2001-12-11
Classification: F25J,Y10S

Abstract:
A method for producing ultra high purity oxygen by cryogenic rectification comprising:(A) providing a feed comprising oxygen, argon, krypton and xenon, and passing the feed into the upper portion of a first column;(B) separating the feed by cryogenic rectification within the first column into a top fluid comprising oxygen and argon, and into a bottom fluid comprising krypton and xenon;(C) passing top fluid from the upper portion of the first column into the upper portion of a second column, and separating the top fluid by cryogenic rectification within the second column into argon-enriched fluid and ultra high purity oxygen; and(D) withdrawing ultra high purity oxygen from the lower portion of the second column and recovering the withdrawn ultra high purity oxygen as product.