Abstract
In order to develop industrial use of branched β-cyclodextrins (CDs), of which solubility in water is remarkably higher than that of unsubstituted β-CD, liquid-liquid extraction of xylene mixture, utilizing the inclusion by branched β-CDs, was examined. The inclusion selectivity to each guest species was in the following order: o-xylene_??_p-xylene>ethylbenzene>m-xylene. Thus, the use of branched β-CDs was found to be useful, in particular, for the separation of o-xylene. The complex formation reached a state of equilibrium in a few minutes. The effect of temperature on the composition and yield of the oil extracted was examined, which indicated that the inclusion at ordinary temperature was preferable. Repetition of inclusion complexation increased the concentration of o-xylene. The once used branched β-CD worked well for inclusion, after the release of guest species.
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