Gas separation such as CO from N in flue gas is an important step in reducing greenhouse gas emission. We discuss a separation method that moves mixed gas between two tracks at different pressures with ever-increasing purity at each stage along the tracks. Designs for adsorbents driven by volumetric pumps and membranes driven by a pressure drop are illustrated. For selectivity exceeding 10 in a three-stage system, the purity of the CO output is 97.8% with 99.75% recovered. For a six-stage example, the purity of CO is 99.996% and 99.9996% is recovered. The cost of compression is estimated from the number of times the two components have to be pressurized as they move between the tracks. For large selectivity, the effective number of times for CO is 2 for the adsorbent case and 3 for the membranes in the three-stage design; these numbers are 5 and 6 in the six-stage design. As a result, the compressional energy requirement per input mole is in the isothermal case for compression factor , effective number of re-compressions , and input CO fraction . This compressional energy exceeds the minimum energy from entropy by the factor if for efficient membrane use.
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7 January 2023
Research Article|
January 03 2023
A method for near-perfect gas separation in two interconnected streams
Bruce Elmegreen
;
Bruce Elmegreen
a)
(Conceptualization, Formal analysis, Investigation, Software, Visualization, Writing – original draft)
1
IBM Thomas J. Watson Research Center
, Yorktown Heights, New York 10598, USA
a)Author to whom correspondence should be addressed: [email protected]
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Binquan Luan
;
Binquan Luan
(Conceptualization, Formal analysis, Software, Visualization, Writing – original draft)
1
IBM Thomas J. Watson Research Center
, Yorktown Heights, New York 10598, USA
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Rodrigo Neumann Barros Ferreira
;
Rodrigo Neumann Barros Ferreira
(Writing – review & editing)
2
IBM Research
, Av. República do Chile, 330, Rio de Janeiro, RJ 20031-170, Brazil
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Breanndan O’Conchuir
Breanndan O’Conchuir
(Writing – review & editing)
3
IBM Research Europe, The Hartree Centre STFC Laboratory Sci-Tech Daresbury Warrington
, Warrington WA4 4AD, United Kingdom
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a)Author to whom correspondence should be addressed: [email protected]
J. Appl. Phys. 133, 015001 (2023)
Article history
Received:
September 25 2022
Accepted:
December 09 2022
Citation
Bruce Elmegreen, Binquan Luan, Rodrigo Neumann Barros Ferreira, Breanndan O’Conchuir; A method for near-perfect gas separation in two interconnected streams. J. Appl. Phys. 7 January 2023; 133 (1): 015001. https://doi.org/10.1063/5.0127983
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