Temperature-vacuum swing adsorption process for capture of CO2
AssigneeUniversity of South Carolina
InventorsJames A. Ritter, Armin D. Ebner, Charles E. Holland
Life of this patent
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Abstract
Methods and systems for capture of CO2 from a hydrated gaseous stream are described. Systems can be utilized for direct air capture of CO2 and incorporate a low energy temperature-vacuum swing adsorption (TVSA) process. A TVSA process can include a multi-step CO2 capture bed regeneration process that includes depressurization of the bed, heating of the bed, venting and purging of the bed, and cooling of the bed. Multiple beds can be cycled between CO2 capture and regeneration, during which captured CO2 is recovered. Off-gas from a CO2 capture bed can be used in regenerating a parallel bed for increased efficiency.
Claims20
A method for separating CO2 from a gaseous stream comprising CO2 and H2O vapor, the method comprising:
- providing a flow of a feed stream to a first desiccant bed to form a dry gaseous stream;
- providing the dry gaseous stream thus formed to a first CO2 capture bed to form a dry, low CO2 content gas stream;
- providing a first portion of the dry, low CO2 content gas stream to a second desiccant bed, the dry, low CO2 content gas thus provided removing H2O from the second desiccant bed and regenerating the second desiccant bed;
- providing a second portion of the dry, low CO2 content gas stream to a second CO2 capture bed as a purge gas;
- and
- regenerating the second CO2 capture bed according to a regeneration process that comprises depressurizing the second CO2 capture bed, heating the second CO2 capture bed following the depressurization, venting the second CO2 capture bed following the heating, purging the second CO2 capture bed by use of the purge gas, and cooling the second CO2 capture bed.
A system for capturing CO2 from a feed gas, the system comprising:
- a first desiccant bed;
- a first CO2 capture bed, wherein a light product end of the first desiccant bed is in controllable communication with a heavy product end of the first CO2 capture bed;
- a second desiccant bed, wherein a light product end of the first CO2 capture bed is in controllable fluid communication with a light product end of the second desiccant bed for countercurrent flow through the second desiccant bed;
- a second CO2 capture bed, wherein the light product end of the first CO2 capture bed is also in controllable fluid communication with a light product end of the second CO2 capture bed for countercurrent flow through the second CO2 capture bed, and wherein
- the light product end of the second desiccant bed is in controllable fluid communication with a heavy product end of the second CO2 capture bed,
- the light product end of the second CO2 capture bed is in controllable fluid communication with the light product end of the first desiccant bed for countercurrent flow through the first desiccant bed, and
- the light product end of the second CO2 capture bed is also in controllable fluid communication with the light product end of the first CO2 capture bed for countercurrent flow through the first CO2 capture bed.
Dependencies are inferred from the claim text.