A series of polyimides containing 2~20 wt.% �-cyclodextrin (�-CD) for separating benzene/cyclohexane mixtures by pervaporation have been prepared and studied. The structures of these PIs and the effect of �-CD content on the properties such as thermal stability, morphologies and surface energies were investigated. The separation efficiency of such membranes containing �-CD is superior over the same component neat polyimide membranes in terms of both flux and separation factor. With the increase of �-CD loading, the separation factor and permeation flux exhibited an increasing then decreasing trend. Comparing with the BTDA-PIs and ODPA-PIs, The 6FDA-ODA/DABA (1:1) polyimides containing equal �-CD content show outstanding separation efficiency. A maximum separation factor of 10.1 with a corresponding flux of 0.86 kg��m�m-2�h-1 for benzene/cyclohexane (50/50 wt.%) at 40�C was obtained at an optimal �-CD loading of 10 wt.%.Key words  : �-cyclodextrin; polyimide; pervaporation; benzene/cyclohexane

Pervaporation of benzene/cyclohexane mixtures through beta-cyclodextrin containing polyimide membranes

243rd National Meeting (2012)

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