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US 7,850,763 B2Granted
Purification of carbon dioxide
AssigneeAir Products and Chemicals, Inc.
InventorsVincent White, Rodney John Allam
Life of this patent
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Abstract
Impure carbon dioxide (“CO2”) comprising a first contaminant selected from the group consisting of oxygen (“O2”) and carbon monoxide (“CO”) is purified by separating expanded impure carbon dioxide liquid in a mass transfer separation column system. The impure carbon dioxide may be derived from, for example, flue gas from an oxyfuel combustion process or waste gas from a hydrogen (“H2”) PSA system.
Claims26
A method for purifying impure carbon dioxide comprising a first contaminant selected from the group consisting of oxygen and carbon monoxide, said method comprising:
- compressing impure carbon dioxide gas to produce compressed impure carbon dioxide gas;
- condensing at least a portion of said compressed impure carbon dioxide gas to produce impure carbon dioxide liquid;
- expanding at least a portion of said impure carbon dioxide liquid to produce expanded impure carbon dioxide liquid;
- and
- separating at least a portion of said expanded impure carbon dioxide liquid in a mass transfer separation column system to produce first contaminant-enriched overhead vapor and carbon dioxide bottoms liquid,
- wherein said carbon dioxide bottoms liquid is reboiled by indirect heat exchange against crude carbon dioxide gas to produce carbon dioxide vapor for the column and cooled crude carbon dioxide gas, and wherein said impure carbon dioxide gas is derived from said crude carbon dioxide gas.
3 more elements
Dependencies are inferred from the claim text.