@article{10902/32182,
year = {2024},
month = {4},
url = {https://hdl.handle.net/10902/32182},
abstract = {Herein, high molecular weight fluorinated aromatic polyimides were assessed for the first time to recover difluoromethane (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 high-purity 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.},
organization = {We kindly acknowledge the funding of projects PID2019-105827RB-I00, PID2022-138028OB-I00, PID2020-118547GB-I100, PID2019-109403RB-C22, PID2019-109403RB-C21 by the Spanish State Research Agency and partially by the European Fund for Regional Development (EU), and the Regional Government of Castilla y León (project VA224P20). F.P., S.V.G.H. and S.R.M acknowledge the support of the Spanish State Research Agency and the Spanish Ministry of Science and Innovation (grants IJC2020-043134-I, PRE2020-093568 and, FPU2019/05446 respectively). All authors kindly thank Dr. Ángel E. Lozano for his advice with the selection of polymers and his helpful discussions and support. We would also like to thank 3M Company for generous donation of polypropylene hollow fibers.},
publisher = {Elsevier},
publisher = {Journal of Membrane Science, 2024, 698, 122617},
title = {6FDA-polyimide thin-film composite hollow fiber membranes for hydrofluorocarbons and CO2 separations},
author = {Gutiérrez Hernández, Sergio Valentín and Rico Martínez, Sandra and Pardo Pardo, Fernando and Alvarez Sancho, Cristina and Miguel García, Jesús Ángel and Zarca Lago, Gabriel and Urtiaga Mendia, Ana María},
}