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Vapor-Phase Sorption Kinetics for Tetrahydrofuran, Tetrahydropyran, and 1,4-Dioxan by Al3+- and Cr3+-Exchanged Montmorillonite

Published online by Cambridge University Press:  02 April 2024

C. Breen ,
A. T. Deane  and
J. J. Flynn
C. Breen*
Affiliation:
School of Chemical Sciences, National Institute for Higher Education, Glasnevin, Dublin 9, Ireland
A. T. Deane
Affiliation:
School of Chemical Sciences, National Institute for Higher Education, Glasnevin, Dublin 9, Ireland
J. J. Flynn
Affiliation:
School of Chemical Sciences, National Institute for Higher Education, Glasnevin, Dublin 9, Ireland
*
1Current address: Chemistry Department, Sheffield City Polytechnic, Pond Street, Sheffield S1 1WB, United Kingdom.
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Abstract

The rate of vapor-phase sorption of tetrahydrofuran (THF), tetrahydropyran (THP), and 1,4-dioxan (DIOX) onto a Wyoming montmorillonite saturated with Al3+ or Cr3+ has been studied by isothermal gravimetry in the temperature range 18° to 105°C using samples of different weights and grain-size distributions. The rate of sorption for all the cyclic ethers increased with decreasing sample and grain size, demonstrating that inter-, rather than intraparticle mass transfer was rate-determining. Optimization of the sample parameters (2 mg sample of <45-μm grain size, pretreated at 120°C yielded integral diffusion coefficients at 18°C of 0.5 × 10−14 m2/s for DIOX for the Cr3+-clay to 3.5 × 10−4 m2/s for THF for the Al3+-clay; however, no temperature or cationic dependence of the cyclic ether uptake was observed. In general, the rate of sorption of the cyclic ethers increased as THF ≥ THP > DIOX indicating that the sorption rate of THF and THP was dependent on concentration or that DIOX sorption was retarded by bidentate coordination to aluminum ions at the edges of the clay platelets.

Keywords

AdsorptionCyclic ethersDiffusionMontmorilloniteVapor
Type
Research Article
Information
Clays and Clay Minerals , Volume 35 , Issue 5 , October 1987 , pp. 343 - 346
Copyright
Copyright © 1987, The Clay Minerals Society

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