US 12,280,330 B2
Dehydration of carbon dioxide
Paul Higginbotham, Guildford (GB); Dingjun Wu, Macungie, PA (US); Gowri Krishnamurthy, Sellersville, PA (US); Todd M. Moyle, Allentown, PA (US); Michelle Roaf, Witley (GB); and Mozhgan Alimohammadi Zanjani, Flemington, NJ (US)
Assigned to AIR PRODUCTS AND CHEMICALS, INC., Allentown, PA (US)
Filed by Air Products and Chemicals, Inc., Allentown, PA (US)
Filed on Jul. 1, 2022, as Appl. No. 17/856,010.
Prior Publication US 2024/0001282 A1, Jan. 4, 2024
Int. Cl. B01D 53/04 (2006.01); B01D 53/26 (2006.01)
CPC B01D 53/0438 (2013.01) [B01D 53/265 (2013.01); B01D 2256/22 (2013.01); B01D 2257/80 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for purifying a carbon dioxide feed stream comprising:
cooling and partially condensing the carbon dioxide feed stream to a first temperature to produce a cooled carbon dioxide stream comprising a vapor fraction and an aqueous liquid fraction;
separating the cooled carbon dioxide stream to produce an overhead vapor stream and an aqueous bottoms stream;
passing the overhead vapor stream through an online adsorber to produce a dry carbon dioxide stream and a loaded adsorber;
cooling and partially condensing the dry carbon dioxide stream or a stream derived from the dry carbon dioxide stream to produce a cold carbon dioxide stream;
separating the cold carbon dioxide stream to produce a cold vent stream and a cold carbon dioxide liquid stream;
expanding at least a portion of the cold carbon dioxide liquid stream to produce a low-pressure carbon dioxide stream;
wherein the carbon dioxide feed is cooled by one or more of at least a portion of the cold carbon dioxide liquid stream, at least a portion of the cold vent stream, and at least a portion of the low-pressure carbon dioxide stream.
 
13. A system for purifying a carbon dioxide feed stream comprising:
a first heat exchanger configured to receive the carbon dioxide feed stream and produce a cooled carbon dioxide stream comprising a vapor fraction and an aqueous liquid fraction;
a first separator configured to receive the cooled carbon dioxide stream and produce an overhead vapor stream and an aqueous bottoms stream;
an adsorber configured to receive the overhead vapor stream and produce a dry carbon dioxide stream;
a second heat exchanger configured to receive the dry carbon dioxide stream and produce a cold carbon dioxide stream;
a cold separator configured to receive the cold carbon dioxide stream and produce a cold vent stream and a cold carbon dioxide liquid stream;
a pressure reducer configured to receive at least a portion of the cold carbon dioxide liquid stream and produce a low-pressure carbon dioxide stream;
wherein the first heat exchanger and the second heat exchanger are in fluid flow communication with one or more of at least a portion of the cold carbon dioxide liquid stream, at least a portion of the cold vent stream, and at least a portion of the low-pressure carbon dioxide stream.