TY - JOUR
T1 - New perfluoro-dioxolane-based membranes for gas separations
AU - Okamoto, Yoshiyuki
AU - Zhang, Hao
AU - Mikes, Frantisek
AU - Koike, Yasuhiro
AU - He, Zhenjie
AU - Merkel, Timothy C.
N1 - Publisher Copyright:
© 2014 Elsevier B.V.
PY - 2014/12/1
Y1 - 2014/12/1
N2 - Perfluoropolymer membranes have found commercial use because of their unique gas separation properties and chemical resistance. To date, studies of gas transport in perfluoropolymers have been limited largely to variants of the commercially available polymers, Teflon® AF, Cytop, and Hyflon® AD. Here, we describe gas transport in composite membranes fabricated from copolymers of perfluoro(2-methylene-4,5-dimethyl-1,3-dioxolane) and perfluoro(2-methylene-1,3-dioxolane). These new perfluoro copolymer membranes have superior gas separation performance compared to the commercial perfluoropolymers for a number of gas pairs, including H2/CH4, He/CH4, N2/CH4, and CO2/CH4. For example, membranes based on 57mol% perfluoro(2-methylene-1,3-dioxolane) show H2/CH4 selectivity of 130 combined with a H2 permeance of 700gpu. These values far exceed an upper bound for commercial perfluoropolymers. The transport properties of the new perfluoro membranes depend strongly on the copolymer composition with increasing amounts of the efficient packing monomer perfluoro(2-methylene-1,3-dioxolane), yielding membranes with higher size selectivity and lower permeance.
AB - Perfluoropolymer membranes have found commercial use because of their unique gas separation properties and chemical resistance. To date, studies of gas transport in perfluoropolymers have been limited largely to variants of the commercially available polymers, Teflon® AF, Cytop, and Hyflon® AD. Here, we describe gas transport in composite membranes fabricated from copolymers of perfluoro(2-methylene-4,5-dimethyl-1,3-dioxolane) and perfluoro(2-methylene-1,3-dioxolane). These new perfluoro copolymer membranes have superior gas separation performance compared to the commercial perfluoropolymers for a number of gas pairs, including H2/CH4, He/CH4, N2/CH4, and CO2/CH4. For example, membranes based on 57mol% perfluoro(2-methylene-1,3-dioxolane) show H2/CH4 selectivity of 130 combined with a H2 permeance of 700gpu. These values far exceed an upper bound for commercial perfluoropolymers. The transport properties of the new perfluoro membranes depend strongly on the copolymer composition with increasing amounts of the efficient packing monomer perfluoro(2-methylene-1,3-dioxolane), yielding membranes with higher size selectivity and lower permeance.
KW - Gas permeance
KW - Membranes
KW - Perfluoropolymers
KW - Selectivity
KW - Trade-off plot
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U2 - 10.1016/j.memsci.2014.07.074
DO - 10.1016/j.memsci.2014.07.074
M3 - Article
AN - SCOPUS:84909644593
SN - 0376-7388
VL - 471
SP - 412
EP - 419
JO - Jornal of Membrane Science
JF - Jornal of Membrane Science
ER -