Separation properties of supported ionic liquid–polydimethylsiloxane membrane in pervaporation process

• Published in: Desalination Vol. 241; no. 1; pp. 182 - 187
• Main Authors: Izák, P., Friess, K., Hynek, V., Ruth, W., Fei, Z., Dyson, J.P., Kragl, U.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 31-05-2009; Elsevier
• Subjects: Adsorption; Applied sciences; Chemical engineering; Diffusion coefficient; Exact sciences and technology; Ionic liquid; Membrane separation (reverse osmosis, dialysis...); Pervaporation; Pollution; Sorption isotherm; Diffusion coefficient; Ionic liquid; Sorption isotherm; Pervaporation; Supported liquid membranes; Adsorption isotherm; Permeation; Liquid membrane; Membrane separation; Binary mixture; Pore size; Enrichment factor; Ultrafiltration; Titanium oxide; Ceramic materials
• ISSN: 0011-9164; 1873-4464
• DOI: 10.1016/j.desal.2007.12.050

Pervaporation separation properties of water–butan-1-ol binary mixtures were measured with the use of three supported liquid membranes at 37°C, namely PDMS, 1-ethenyl-3-ethyl-imidazolium hexafluorophosphate–PDMS, and tetrapropyl-ammonium tetracyanoborate–PDMS membranes. An ultrafiltration ceramic module from TiO
2 with 60 nm pore size was used as a support. The diffusion coefficients of butan-1-ol in IL-PDMS were much higher than in PDMS only. However, the sorption isotherms were identical for all three measured membranes. Higher permeation flux and enrichment factors of butan-1-ol in IL-PDMS membrane were probably caused by higher diffusion coefficient. The supported ionic liquid membranes were stable during all measurements.