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US 6,035,662 AGranted
Method and apparatus for enhancing carbon dioxide recovery
AssigneePraxair Technology, Inc.
InventorsHenry Edward Howard, Claudio Bruno Capurro
Life of this patent
Estimating the term…
Abstract
A process and an apparatus for producing substantially pure carbon dioxide from a carbon dioxide feed containing from about 80% to about 95% volume of carbon dioxide.
Claims20
A process for producing substantially pure carbon dioxide from a carbon dioxide feed containing from about 80 percent to about 98 percent by volume of carbon dioxide, said process comprising:
- a) distilling the carbon dioxide feed in a distillation column thereby to form a liquid product containing substantially pure carbon dioxide and an overhead vapor stream containing carbon dioxide;
- b) compressing the overhead vapor stream in a compression stage to form a compressed stream, the overhead vapor stream being compressed to a pressure sufficient to allow a substantial portion of carbon dioxide contained in the overhead vapor stream to be condensed;
- c) cooling the compressed stream in a heat exchanger into a cooled stream, to cool and partially condense the compressed stream;
- d) phase separating the cooled stream in a phase separator into a condensate liquid and a residual vapor;
- and
- e) returning the condensate liquid to the distillation column to be distilled further in said distilling step.
3 more elements
An apparatus for producing substantially pure carbon dioxide from a carbon dioxide feed containing from about 80 percent to about 98 percent by volume of carbon dioxide, said apparatus comprising:
- a) a distillation column for distilling the carbon dioxide feed thereby to form a liquid product containing substantially pure carbon dioxide and an overhead vapor stream containing carbon dioxide;
- b) a compression stage for compressing the overhead vapor stream to form a compressed stream, the overhead vapor stream being compressed to a pressure sufficient to allow a substantial portion of carbon dioxide contained in the overhead vapor stream to be condensed;
- c) a heat exchanger for cooling the compressed stream to cool and partially condense the compressed stream into a cooled stream;
- d) a phase separator for phase separating the cooled stream into a condensate liquid and a residual vapor;
- and
- e) a return line for returning the condensate liquid to said distillation column for further distillation.
3 more elements
Dependencies are inferred from the claim text.