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Pervaporation Separation of Trace Toluene from Water Using Hydrophobic Copolyimide Membranes  

Kim, Jeong-Hoon (Environment & Energy Research Center, Sustainable Chemical Technologies, Korea Research Institute of Chemical Technology)
Chang, Bong-Jun (Environment & Energy Research Center, Sustainable Chemical Technologies, Korea Research Institute of Chemical Technology)
Lee, Soo-Bok (Biorefinery Research Center, Sustainable Chemical Technologies, Korea Research Institute of Chemical Technology)
Publication Information
Membrane Journal / v.17, no.4, 2007 , pp. 287-293 More about this Journal
Abstract
Pervaporation separation of toluene from water were studied using hydrophobic copolyimide membranes. The copolyimide membranes were prepared from 4,4'-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) and two diamines (polysiloxane diamine (SIDA)/2-(perfluorohexyl) ethyl-3,5-diaminobenzene (PFDAB)). The pervaporation properties for toluene/water were investigated in terms of mol ratio of SIDA/PFDAB in polyimide membranes. Sorption- and diffusion-related properties were measured to analyze the permeation properties in solution-diffusion theory, It was found that as the SIDA content in the membranes increased, sorption of toluene and sorption selectivity of toluene/water increased due to high affinity of siloxane moiety toward toluene. Diffusion coefficient of toluene and diffusion selectivity of toluene/water also increased with SIDA content due to high free volume of siloxane moiety. As the results, the permeation flux and pervaporation selectivity increased markedly from 0.005 $kg/m^2h$ to 049 $kg/m^2h$ and from 9 to 6380, respectively.
Keywords
pervaporation; toluene; hydrophobic; copolyimide; membrane;
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Times Cited By KSCI : 1  (Citation Analysis)
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