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US 7,608,133 B2Granted
Lithium-exchanged faujasites for carbon dioxide removal
AssigneeHoneywell International Inc.
InventorsStephen F. Yates, Allen A. MacKnight
Life of this patent
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Abstract
A process for removal of carbon dioxide from air using lithium-exchanged X-zeolites at low carbon dioxide partial pressures is provided. The process is particularly useful in applications where fresh air is not available and exhaled air needs to be recycled. An apparatus for carrying out the process is also provided.
Claims17
A process for removing carbon dioxide from a gas comprising the steps of:
- feeding a stream of gas through an adsorbent bed at a carbon dioxide partial pressure of less than about 10 torr;
- adsorbing carbon dioxide from the gas stream to yield a carbon-dioxide depleted gas, the adsorbent bed comprising a lithium-exchanged X-zeolite;
- and
- regenerating the adsorbent bed, after it is substantially saturated, with a pressure swing desorption from about 1×10−6 torr to about 1 torr.
1 more element
A process for removing carbon dioxide from air comprising the steps of:
- feeding a stream of air, at approximately ambient pressure, through an adsorbent bed at a carbon dioxide partial pressure from about 0.1 torr to 1 torr to yield a carbon dioxide depleted gas, the adsorbent bed comprising a lithium-exchanged X-zeolite;
- and
- regenerating the adsorbent bed when it is saturated.
A process for removing carbon dioxide from air comprising the steps of:
- feeding the air through a desiccant bed to yield a dry air;
- feeding the air through an adsorbent bed at a carbon-dioxide partial pressure of from about 0.1 torr to about 1 torr to yield carbon dioxide depleted air, the adsorbent bed comprising a lithium-exchanged X-zeolite;
- and
- regenerating the adsorbent bed, after it is substantially saturated, with a pressure swing desorption from about 1×10−6 torr to about 1 torr.
1 more element
Dependencies are inferred from the claim text.