Abstract:
Adsorption of CO2 from post-combustion flue gas is one
of the leading candidates for globally-impactful carbon capture systems.
This work highlights opportunities and limitations of sub-ambient
CO2 capture processes utilizing a multi-stage separation
process. A hybrid process design using a combination of pressure-driven
separation of CO2 from flue gas followed by
CO2-rich product liquefaction to produce high purity
(>99%) CO2 at pipeline conditions is
considered. The economic viability of applying pressure swing adsorption
(PSA) processes using fiber sorbent contactors with internal heat
management were found to be most influenced by the productivity of the
adsorption system. Three exemplar fiber sorbents (MIL-101(Cr), UiO-66,
and zeolite 13X) were considered for application in the sub-ambient
process of PSA unit. MIL-101(Cr) and UiO-66 fiber composites were
estimated to have costs of capture as low as $61/tonne
CO2.
Topical Headline: Separations, Materials, Devices and Processes
Keywords: CO2 Capture, Pressure Swing
Adsorption, Sub-ambient Process, Fiber Sorbents, Heat Management