Membrane selectivity in the organic solvent nanofiltration of trialkylamine bases
Patterson, D., Yenlau, L., Roengpithya, C., Gibbins, E. and Livingston, A., 2008. Membrane selectivity in the organic solvent nanofiltration of trialkylamine bases. Desalination, 218 (1-3), pp. 248-256.
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Dead-end and cross-flow organic solvent nanofiltrations (OSNs) using StarMem™ 122 (220 g mol−1 nominal molecular weight cut-off (MWCO)) were conducted on a homologous series of trialkylamine bases, ranging from triethylamine (MW = 270 g mol−1) to tridodecylamine (TDDA; MW = 522 g mol−1). Dead-end OSN gave the expected rejections of 97–99% for bases larger than the MWCO, except TDDA, which unexpectedly had an average rejection of only 19%. MWCO therefore does not accurately represent the selectivity of StarMem™ 122. To investigate the reasons for this, cross-flow OSN of the same trialkylamine bases was conducted. This did not give a low TDDA rejection however, and the rejections of all the other bases were lower than in dead-end OSN. These results are most likely due to greater concentration polarisation and/or fouling in the dead-end OSNs. Furthermore, by reconciling these results with the currently understood membrane mass transport models, it is thought that it indicates that both pore flow and solution diffusion play a role in the trialkylamine transport across StarMem™ 122 membranes.
|Creators||Patterson, D., Yenlau, L., Roengpithya, C., Gibbins, E. and Livingston, A.|
|Departments||Faculty of Engineering & Design > Chemical Engineering|
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