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US 8,088,196 B2Granted
Purification of carbon dioxide
AssigneeAir Products and Chemicals, Inc.
InventorsVincent White, Rodney John Allam
Life of this patent
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Abstract
Carbon dioxide and oxygen are separated from a feed gas, preferably derived from flue gas from an oxyfuel combustion process, by diffusion across at least one membrane in a membrane separation system to produce separated carbon dioxide gas comprising oxygen, which is fed to the oxyfuel combustion process to improve the performance of the process.
Claims25
A method for oxyfuel combustion of a fuel selected from the group consisting of carbonaceous fuel;
- hydrocarbonaceous fuel;
- and mixtures thereof, said method comprising:
- combusting said fuel in the presence of oxygen in an oxyfuel combustion unit to produce flue gas comprising carbon dioxide and oxygen as a contaminant gas;
- separating carbon dioxide and oxygen from feed gas comprising carbon dioxide and oxygen by diffusion across at least one permeable membrane in a membrane separation system to produce permeate gas comprising carbon dioxide and oxygen, and vent gas;
- and
- feeding at least a portion of said permeate gas in a conduit arrangement from said membrane separation system to said oxyfuel combustion unit to provide oxygen for combustion therein,
- wherein carbon dioxide and oxygen in said feed gas originate from said flue gas.
4 more elements
Apparatus for oxyfuel combustion of a fuel selected from the group consisting of carbonaceous fuel;
- hydrocarbonaceous fuel;
- and mixtures thereof, said apparatus comprising:
- an oxyfuel combustion unit for combusting said fuel in the presence of oxygen to produce flue gas comprising carbon dioxide and oxygen as a contaminant gas;
- a membrane separation system comprising at least one permeable membrane for separating carbon dioxide and oxygen from feed gas comprising carbon dioxide and oxygen by diffusion across said membrane(s) to produce permeate gas comprising carbon dioxide and oxygen, and vent gas;
- a conduit arrangement for feeding permeate gas from said membrane separation system to said oxyfuel combustion unit to provide oxygen for combustion therein;
- and
- a separation system for producing said feed gas from said flue gas.
4 more elements
Dependencies are inferred from the claim text.