Gas separation and water desalination performance of defect-free interfacially polymerized para-linked polyamide thin-film composite membranes
Pacheco Oreamuno, Federico
KAUST DepartmentAdvanced Membranes and Porous Materials Research Center
Chemical Engineering Program
Chemical Science Program
Nanostructured Functional Materials (NFM) laboratory
Physical Science and Engineering (PSE) Division
KAUST Grant NumberBAS/1/1323-01-01
Embargo End Date2022-08-10
Permanent link to this recordhttp://hdl.handle.net/10754/664581
MetadataShow full item record
AbstractIntroduction of interfacially polymerized (IP) polyamide thin-film composite (TFC) membranes in the 1980s revolutionized the reverse osmosis desalination industry. However, IP-derived TFCs have not achieved industrial success for gas separation applications due to the presence of membrane defects in their dry state. In this work, we report defect-free crosslinked polyamide thin-film composite membranes prepared from para-substituted aromatic and cycloaliphatic diamines, p-phenylenediamine (PPD) and piperazine (PIP), reacted with trimesoyl chloride (TMC). The key parameters in our modified IP process to mitigate defects are long reaction time (∼5 min) and high organic solution temperature (100 °C). The gas separation and desalination properties of the para-linked polyamide membranes were compared to previously reported polyamide TFCs made from meta-phenylenediamine (MPD) and TMC. The gas- and water permeances of the TFCs increased in the order: MPD-TMC < PPD-TMC < PIP-TMC, whereas gas-pair selectivities and salt rejections followed the opposite sequential trend: MPD-TMC > PPD-TMC ≥ PIP-TMC. Elimination of defects allowed exploitation of the ultra-selective nature of polyamide TFCs, specifically for hydrogen and helium separations. At 23 °C, PIP-TMC, PPD-TMC and MPD-TMC exhibited H2/CH4 selectivities of 312, 362 and 1290, respectively, with moderate H2 permeances of 37.4, 32.6 and 25.8 GPU (1 GPU = 10−6 cm3(STP) cm−2 s−1 cmHg−1). Furthermore, the TFCs demonstrated excellent performance for H2/CO2 separation with pure-gas selectivities of 10-14 at 23 °C. The strong size-sieving capability of the polyamide TFCs originated from tight interchain packing induced by strong hydrogen bonding. Wide-angle X-ray diffraction confirmed a dominant fraction of submicropores of less than ∼4 Å within PPD-TMC and PIP-TMC polyamide networks.
CitationAli, Z., Wang, Y., Ogieglo, W., Pacheco, F., Vovusha, H., Han, Y., & Pinnau, I. (2020). Gas separation and water desalination performance of defect-free interfacially polymerized para-linked polyamide thin-film composite membranes. Journal of Membrane Science, 118572. doi:10.1016/j.memsci.2020.118572
SponsorsThe research reported in this publication was supported by funding (BAS/1/1323-01-01) from King Abdullah University of Science and Technology (KAUST).
JournalJournal of Membrane Science