By modifying the synthesis route, we have synthesized ZIF-90 nanoparticles with an average particle size of 55 nm and embedded them into P84 polymeric membranes with excellent dispersion for the dehydration of isopropanol (IPA)/water mixture via pervaporation. The effects of ZIF-90 loading as well as feed temperature on pervaporation performance of the mixed matrix membranes (MMMs) were systematically investigated. The flux of MMMs increases with increasing ZIF-90 loading due to the enhanced fractional free volume, while the separation factor of water/IPA can be maintained at 5432 when the ZIF-90 loading is less than 20 wt%, but reduced to 385 when the ZIF-90 loading is 30 wt%. Interestingly, the application of sulfonated polyethersulfone (SPES) as a primer to ZIF-90 nanoparticles before fabricating MMIVls consisting of 30 wt% ZIF-90 recovers the separation factor without sacrificing the flux. The best IVIMM showed the separation performance with a flux of 109 g m(-2) h(-1) and a separation factor of 5668 at 60 degrees C. This encouraging performance suggests a promising future of ZIF-90/P84 composite membranes for the dehydration of IPA via pervaporation process. (C) 2013 Elsevier B.V. All rights reserved