Highly permeable and selective CO2 separation membrane to utilize 5-hydroxyisophthalic acid in poly(ethylene oxide) matrix

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Vol. 334; pp. 1749 - 1753
• Main Authors: Yoon, Ki Wan, Kang, Sang Wook
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.02.2018
• Subjects: 5-hydroxyisophthalic acid; CO2; Membrane; Separation; Solubility; Membrane; Separation; 5-hydroxyisophthalic acid; CO2; Solubility
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2017.11.113

•CO2 separation membranes consisting of poly(ethylene oxide) (PEO)/5-hydroxyisophthalic acid composite.•The synergistic effect of 5-hydroxyisophthalic acid for both high solubility of CO2 and barrier against N2 molecules.•Enhanced CO2 separation performance by incorporation of 5-hydroxyisophthalic acid. The effect of 5-hydroxyisophthalic acid on the transport of CO2 molecules was investigated for various polymer composite membranes for highly permeable and selective membrane. It was expected that the carboxyl groups of 5-hydroxyisophthalic acid would generate dipole-dipole interactions with CO2 molecules, allowing for increased solubility of CO2, and that the benzene rings would provide a barrier effect, resulting in decreased N2 transport. When 5-hydroxyisophthalic acid was incorporated into a poly(ethylene oxide) (PEO) polymer matrix, the separation performance of the membrane was enhanced and the ideal selectivity of CO2 over N2 (CO2/N2 = 32.4) and CO2 permeability of 573 barrer were observed. The coordinative interactions in the PEO/5-hydroxyisophthalic acid composite were characterized with FT-IR and thermogravimetric analysis.