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US 2008/0173585 A1Published application
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.
Claims41
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.
2 more elements
Dependencies are inferred from the claim text.