Dehydration of carbon dioxide
AssigneeAir Products and Chemicals, Inc.
InventorsPaul Higginbotham, Dingjun Wu, Gowri Krishnamurthy, Todd M. Moyle, Michelle Roaf, Mozhgan Alimohammadi Zanjani
Life of this patent
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Abstract
A method and system for purifying a carbon dioxide feed stream in which the carbon dioxide feed stream is cooled and partially condensed to remove water upstream of an adsorber to produce a dry carbon dioxide stream. The dry carbon dioxide stream is further cooled and partially condensed in a carbon dioxide purification unit to form a carbon dioxide product stream. Excess refrigeration duty from the carbon dioxide purification unit is used to cool the carbon dioxide feed stream.
Claims20
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.
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.
Dependencies are inferred from the claim text.