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US 6,105,388 AGranted
Multiple circuit cryogenic liquefaction of industrial gas
AssigneePraxair Technology, Inc.
InventorsArun Acharya, Bayram Arman, Joseph Alfred Weber, Vijayaraghavan Srinivasan, Jeffert John Nowobilski, James Smolarek, Neno Todorov Nenov
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Abstract
A method for more efficiently cooling and liquefying industrial gas wherein refrigeration for the cooling and liquefaction is generated using first and second defined multicomponent refrigerant fluids in separate refrigeration circuits to cover a wide temperature range from ambient to cryogenic temperature.
Claims10
A method for cooling an industrial gas comprising:
- (A) compressing a first multicomponent refrigerant fluid comprising at least one component from the group consisting of fluorocarbons, hydrofluorocarbons and fluoroethers and at least one component from the group consisting of fluorocarbons, hydrofluorocarbons, fluoroethers and atmospheric gases;
- (B) cooling the compressed first multicomponent refrigerant fluid and expanding the cooled compressed first multicomponent refrigerant fluid to generate refrigeration;
- (C) warming the expanded first multicomponent refrigerant fluid by indirect heat exchange with the compressed first multicomponent refrigerant fluid to effect said cooling of the compressed first multicomponent refrigerant fluid;
- (D) compressing a second multicomponent refrigerant fluid comprising at least one component from the group consisting of fluorocarbons, hydrofluorocarbons and fluoroethers and at least one atmospheric gas;
- (E) warming the expanded first multicomponent refrigerant fluid by indirect heat exchange with the compressed second multicomponent refrigerant fluid to cool the compressed second multicomponent refrigerant fluid;
- (F) further cooling the cooled compressed second multicomponent refrigerant fluid and expanding the further cooled second multicomponent refrigerant fluid to generate refrigeration;
- (G) warming the expanded second multicomponent refrigerant fluid by indirect heat exchange with the compressed second multicomponent refrigerant fluid to effect said further cooling of the compressed second multicomponent refrigerant fluid;
- and
- (H) warming the expanded second multicomponent refrigerant fluid by indirect heat exchange with industrial gas to cool said industrial gas.
6 more elements
Dependencies are inferred from the claim text.