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US 5,394,827 AGranted
Draft tube, direct contact cryogenic crystallizer
AssigneePraxair Technology, Inc.
InventorAlan T. Cheng
Life of this patent
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Abstract
A direct contact cryogenic crystallizer having a vertically oriented draft tube into which cryogenic fluid is injected at a high velocity along with warm gas and through which a crystal slurry is drawn for subsequent cooling and agitation for the production of crystals.
Claims7
A direct contact cryogenic crystallizer comprising:
- (A) a crystallizer vessel;
- (B) A draft tube positioned within said crystallizer vessel with the lower end of said draft tube spaced from the bottom surface of said vessel;
- (C) an injection nozzle positioned for injecting fluid into said draft tube;
- (D) means for providing cryogenic fluid through said injection nozzle;
- and
- (E) means for providing warm gas at a temperature exceeding -109.degree. F. through said injection nozzle.
3 more elements
Dependencies are inferred from the claim text.