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8. The effect of operating conditions on the performance of hollow fiber membrane modules for CO2/N2 separation.

Author

Hwang, Hae Young, Nam, Sang Yong, Koh, Hyung Chul, Ha, Seong Yong, Barbieri, Giuseppe, and Drioli, Enrico

Subjects
PERFORMANCE evaluation, HOLLOW fibers, CARBON dioxide, ENERGY consumption, GAS separation membranes, HIGH temperatures
Abstract

Abstract: A commercialized polysulfone (PSf) hollow-fiber membrane module was tested for CO2/N2 separation performance for application in post-combustion capture. Cost efficiency, easy module manufacturing, and efficiency in gas separation are the main advantages of using PSf hollow-fiber modules for CO2 separation. The effects of operating conditions such as temperature, pressure, and feed composition on separation performance were examined at various stage cuts. A 2-stage system including concentration of feed composition at stage 1 and production of high-purity CO2 at stage 2 was constructed to improve separation efficiency. Higher operating temperature and pressure increased CO2 permeance, but the loss of selectivity and higher energy consumption are a concern. Modules with various membrane areas were also used to test the effect of area on CO2 separation. [Copyright &y& Elsevier]

Published
2012
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10. Poly(poly(ethylene glycol) methyl ether acrylate) micelles for highly CO2 permeable membranes.

Author

Seong, Mun Suk, Yu, Hyun Jung, Ha, Seong Yong, Chang, Won Seok, Kim, Hyung-Ju, and Lee, Jong Suk

Subjects
*METHYL acrylate, *MICELLES, *CARBON dioxide, *POLYETHYLENE glycol, *MEMBRANE separation, *METHYL ether, *MICELLAR solutions, *ETHYLENE glycol
Abstract

Herein, we report highly CO 2 -permeable membranes obtained by blending in situ self-assembled micellar-structured poly(poly(ethylene glycol) methyl ether acrylate) (PPEGMEA) with poly(ether-block-amide) (Pebax). PPEGMEA with different molecular weights were prepared by varying the concentration of benzoyl peroxide (BPO) in a Pebax/PEGMEA/BPO mixture during radical polymerization. Significantly, the Pebax/PPEGMEA (30/70 w/w) blend membrane comprised highly CO 2 -philic PPEGMEA micelles, which appreciably increased the d -spacing of the Pebax matrix. Consequently, the blend membrane containing a high molecular weight of PPEGMEA exhibited an unprecedented CO 2 permeability enhancement of 1054% compared to the pristine Pebax membrane while maintaining good CO 2 selectivity relative to H 2 , O 2 , N 2 , CO, and CH 4 because of the enriched polyethylene glycol moieties. This excellent separation performance was maintained for 100 h, validating the good long-term separation performance of the membrane. Furthermore, the membrane exhibited good mechanical strength and plasticization tolerance, resulting in excellent CO 2 separation performance under equimolar CO 2 /N 2 or CO 2 /CH 4 mixed gas conditions (CO 2 permeability of 1250 Barrer and CO 2 /N 2 and CO 2 /CH 4 selectivity of 31.5 and 12.7, respectively), up to a CO 2 partial pressure of 10 atm. Our simple but effective in situ micelle-induced blending approach is a significant step toward realizing high-performance CO 2 separation membranes. [Display omitted] • Poly(poly(ethylene glycol) methyl ethyl acrylates) (PPEGMEAs) were made via in-situ radical polymerization in Pebax matrix. • A high molecular weight (Mn: 57 kg/mol) of PPEGMEA formed CO 2 -philic micellar structure. • The micelles of PPEGMEA significantly enlarged d -spacing of Pebax matrix, improving CO 2 permeability by 1054%. • Pebax/PPEGMEA membrane maintained good CO 2 /gas selectivity due to the enriched PEG moieties. • Pebax/PPEGMEA membrane showed excellent CO 2 separation performance up to a CO 2 partial pressure of 10 atm. [ABSTRACT FROM AUTHOR]

Published
2022
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