RT info:eu-repo/semantics/article
T1 6FDA-polyimide thin-film composite hollow fiber membranes for hydrofluorocarbons and CO2 separations
A1 Gutiérrez Hernández, Sergio V.
A1 Rico Martínez, Sandra
A1 Pardo, Fernando
A1 Álvarez, Cristina
A1 Miguel García, Jesús Ángel
A1 Zarca, Gabriel
A1 Urtiaga, Ane
K1 Poliimidas
K1 Fluorinated polyimides
K1 Hollow fiber
K1 Thin film composite membrane
K1 Hydrofluorocarbons
K1 R-32
K1 CO2
K1 2210 Química Física
AB Herein, high molecular weight fluorinated aromatic polyimides were assessed for the first time to recoverdifluoromethane (R-32) from its blends with other hydrofluorocarbons and hydrofluoroolefins (R-134a: 1,1,1,2- tetrafluoroethane, R-125: pentafluoroethane, and R-1234yf: 2,3,3,3-tetrafluoropropene). First, a screening was performed with thick flat membranes made of the 4,4’-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) and three different amines: 2,2′-bis(4-aminophenyl)hexafluoropropane (6FpDA), 2,4,6-trimethyl-m-phenylenediamine (TMPD), and 2,3,5,6-tetramethyl-1,3-phenyldiamine (durene). As a result, 6FDA-TMPD was selected for the fabrication of defect-free hollow fiber-thin film composite membranes (HF-TFCM) due to its superior performance for the separation of R-32. These HF-TFCMs showed excellent separation performance to reclaim highpurity R-32 (permeate concentration >99 vol%) from the commercial binary blends R-410A and R-454B (a mixture of R-32 and R-1234yf). In addition, we report for the first time the membrane recovery of R-32 from the ternary blend R-407C (R-32/R-134a/R-125 38.2:43.8:18 vol%). Eventually, the separation of CO2 from synthetic gas mixtures of CO2/CH4 (50:50 vol%) and CO2/N2 (15:85 vol%) was performed for benchmarking, showing that the prepared HF-TFCM kept the separation performance of the 6FDA-TMPD thick membranes.
PB Elsevier
SN 0376-7388
YR 2024
FD 2024
LK https://uvadoc.uva.es/handle/10324/70912
UL https://uvadoc.uva.es/handle/10324/70912
LA eng
NO Journal of Membrane Science, Abril 2024, vol. 698
NO Producción Científica
DS UVaDOC
RD 22-dic-2024