Comparison of asymmetric and thin-film composite membranes having Matrimid 5218 selective layer

Thin-film composite membranes in contrast to asymmetric membranes allow using expensive or rare materials for the selective layer. The polymer of the selective layer can be crosslinked before or after deposition, different modifiers, including inorganic nanoparticles can be introduced into the polymer matrix allowing varying the gas separation and the mechanical properties. The main problem in the development of this type of membranes is the reduction of the effective thickness of the selective layer. Matrimid composite membranes were obtained by lamination of the diluted polymer solution on porous support. The highest Presented at EUROMEMBRANE 2006, 24–28 September 2006, Giardini Naxos, Italy. 0011-9164/06/$– See front matter © 2006 Elsevier B.V. All rights reserved. doi:10.1016/j.desal.2006.03.044 Matrimid 0.7 0.4 THF γBL NMP CHCl3 0.3 CH2Cl2 0.8 0.2 Selectivity H2/CH4 0.6 0.9 0.10 0.15 0.20 0.25 P(H2), m3m–2h–1bar–1 1.0 Solvent 0.0 0.05 0.1 0.1 0.2 0.3 0.4 0.0 n-BuOH Test No. Fig. 1. Cloud point lines for Matrimid and n-BuOH in the presence of different solvents used for membrane preparation.