Preparation of Etherified β-Cyclodextrin and SelectivitYIN Its Blend Membrane for Xylene Isomers

Abstract

Abstract: Etherified β-CD was synthesized bYUsing benzyl chloride(PhCH₂₂Cl).The influences of etherification conditions on the reaction conversion and the degree of substitution of etherified β-CD were investigated. The reaction conversion increases with increasing molar ratio of PhCH₂₂Cl to β-CD and the concentration of β-CD. The most proper temperature and time for the reaction conversion are 90 ℃ and 12 h, respectively. The degree of substitution of etherified β-CD increases greatly with increasing molar ratio of PhCH₂₂Cl to β-CD, but there is no significant change for the degree of substitution when temperature, time and concentration of β-CD increased. Meanwhile, the pervaporation performance of PVB membrane containing 25%(mass fraction) etherified β-CD for 10%(mass fraction) PX in PM/MX mixture were measured, and the separation factor α=1.16, permeation flux J=70.57 g/(m²·h) at 30 ℃ were obtained.

Key words: Cyclodextrin, Etherification, Benzyl chloride, Xylene, Pervaporation membrane

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QIAN Jin-Wen, WANG Li-Na, AN Quan-Fu, CHEN Huan-Lin . Preparation of Etherified β-Cyclodextrin and SelectivitYIN Its Blend Membrane for Xylene Isomers[J]. Chem. J. Chinese Universities, 2003, 24(6): 1106.

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Preparation of Etherified β-Cyclodextrin and SelectivitYIN Its Blend Membrane for Xylene Isomers

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