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US 5,666,828 AGranted
Cryogenic hybrid system for producing low purity oxygen and high purity oxygen
AssigneePraxair Technology, Inc.
InventorsHenry Edward Howard, Dante Patrick Bonaquist, Paul Louis Just
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Abstract
A method for producing low purity oxygen and high purity oxygen using a cryogenic rectification column wherein feed air is enriched in oxygen in an upstream adsorbent bed system prior to passage into the column and refrigeration is generated by turboexpansion of adsorbent bed effluent or column top vapor.
Claims7
A method for producing low purity oxygen and high purity oxygen comprising:
- (A) passing feed air through an adsorbent system comprising at least one adsorbent bed and adsorbing nitrogen from the feed air onto the adsorbent to produce first low purity oxygen;
- (B) passing some of the first low purity oxygen into a column and separating the first low purity oxygen within the column by cryogenic rectification into second low purity oxygen and into high purity oxygen;
- (C) recovering high purity oxygen from the lower portion of the column as product high purity oxygen;
- (D) recovering at least some of the first low purity oxygen and the second low purity oxygen as product low purity oxygen;
- and
- (E) returning some of the second low purity oxygen to the column.
3 more elements
Dependencies are inferred from the claim text.