Processes and apparatuses for treating nox separated from carbon dioxide
AssigneeUop LLC
InventorsJeffrey Tyska, Xi Zhao, Ling Zhou, Carl J. Stevens
Life of this patent
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Abstract
Processes and apparatuses for treating NOx from a carbon dioxide stream. Prior to separating carbon dioxide and NOx, NOx is converted to nitrogen gas in an NOx conversion zone, which may include an SCR reactor and/or CO boiler. A carbon separation zone which may include one or more fractionation columns produces a CO2 stream and an NOx stream. The NOx is passed back to the NOx conversion zone.
Claims20
A process for treating NOx from a carbon dioxide stream, the process comprising:
- converting NOx from a feed stream comprising carbon dioxide into nitrogen gas in a NOx conversion zone, and produce an NOx depleted effluent stream, the NOx depleted effluent stream having a lower amount of NOx compared to the feed stream;
- separating NOx from carbon dioxide in the NOx depleted effluent stream effluent stream in a carbon separation zone into a carbon dioxide enriched stream and a NOx enriched stream;
- and
- converting NOx from the NOx enriched stream into nitrogen in the NOx conversion zone or an FCC unit.
A process for treating NOx from a carbon dioxide stream, the process comprising:
- passing a feed stream comprising carbon dioxide and NOx to a NOx conversion zone, the NOx conversion zone configured to produce a NOx depleted effluent stream, the NOx depleted effluent stream having a lower amount of NOx compared to the feed stream;
- passing the NOx depleted effluent stream to a carbon separation zone, the carbon separation zone configured to separate NOx from carbon dioxide in the NOx depleted effluent stream into a carbon dioxide enriched stream and a NOx enriched stream;
- and
- passing the NOx from the NOx enriched stream to the NOx conversion zone.
An apparatus for removing NOx from a carbon dioxide stream, the apparatus comprising:
- a NOx conversion zone, the NOx conversion zone configured to produce a NOx depleted effluent stream, the NOx depleted effluent stream having a lower amount of NOx compared to the feed stream;
- a carbon separation zone, the carbon separation zone configured to receive the NOx depleted effluent stream and separate NOx from carbon dioxide into a carbon dioxide enriched stream and a NOx enriched stream;
- and
- a line configured to pass the NOx from the NOx enriched stream to the NOx conversion zone.
Dependencies are inferred from the claim text.