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US 5,775,128 AGranted
Process for producing ammonia and recovering argon using low purity oxygen
AssigneePraxair Technology, Inc.
InventorsRaymond Francis Drnevich, Theodore Fringelin Fisher
Life of this patent
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Abstract
A process for producing ammonia synthesis gas and recovering argon in conjunction with a low-purity oxygen separating unit.
Claims20
A process for producing ammonia synthesis gas and recovering argon in conjunction with a low purity oxygen separating unit, said process comprising:
- (a) providing a feed gas comprising at least oxygen, nitrogen and argon into said separating unit to separate said feed gas into at least a low-purity oxygen gas and nitrogen;
- (b) passing said nitrogen into a wash unit comprising a wash column and at least one cryogenic fractional distillation column;
- (c) washing a hydrogen-rich, argon-containing gas with at least a portion of said nitrogen in said wash column to produce a rich hydrogen-nitrogen mixture and an argon-containing residual liquid;
- (d) combining said rich hydrogen-nitrogen mixture with another portion of said nitrogen gas to produce ammonia synthesis gas;
- (e) passing said residual liquid into at least one of said distillation column;
- and
- (f) recovering argon from said distillation column.
4 more elements
A process for producing ammonia synthesis gas and recovering argon in a wash unit, said process comprising:
- (a) passing nitrogen into said wash unit comprising a wash column and at least one cryogenic fractional distillation column;
- (b) washing a hydrogen-rich, argon-containing gas with said nitrogen in said wash column to produce a rich hydrogen-nitrogen mixture and an argon-containing residual liquid;
- (c) combining said rich hydrogen-nitrogen mixture with another portion of said nitrogen gas to produce ammonia synthesis gas;
- (d) passing said residual liquid into at least one of said distillation column;
- and
- (e) recovering argon from said distillation column.
3 more elements
Dependencies are inferred from the claim text.