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The adsorption of 1,4-dioxan, tetrahydrofuran and tetrahydropyran from binary solution with methanol on Al3+ and Cr3+-exchanged montmorillonite

Published online by Cambridge University Press:  09 July 2018

C. Breen  and
A. Deane
C. Breen
Affiliation:
School of Chemical Sciences, National Institute for Higher Education, Glasnevin, Dublin 9, Eire
A. Deane
Affiliation:
School of Chemical Sciences, National Institute for Higher Education, Glasnevin, Dublin 9, Eire
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Abstract

Surface excess isotherms were determined for the adsorption of 1,4-dioxan (DIOX), tetrahydropyran (THP) and tetrahydrofuran (THF) from binary solution with methanol (MeOH) on Al3+- and Cr3+-exchanged, montmorillonite containing different amounts of pre-adsorbed water. The isotherm type is dominated by the binary mixture whereas the amplitude, which follows the sequence DIOX > THP > THF, is further influenced by the exchange cation, Al3+ > Cr3+, and the water content of the clay. The sorption of DIOX and THP from MeOH exhibit a type IV isotherm in the Schay-Nagy classification on both cation-exchanged forms, whilst that of THF from MeOH is of type I and THF is the preferred adsorbate. The azeotropic point for the type IV isotherms is close to a 1:1 mole ratio for the samples dried at 120°C but when the samples are rehydrated at 12% r.h. following thermal pretreatment at 120°C the azeotropic point shifts in favour of the cyclic ethers DIOX and THP, making them the preferred component over a substantial portion of the composition range.

Type
Research Article
Information
Clay Minerals , Volume 22 , Issue 2 , June 1987 , pp. 199 - 205
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1987

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