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Selective liquid sorption and wetting of pillared montmorillonites

Published online by Cambridge University Press:  09 July 2018

F. Berger ,
I. Dekany ,
K. Beneke  and
G. Lagaly
F. Berger
Affiliation:
Department of Colloid Chemistry, Attila József University, H-6720 Szeged, Hungary
I. Dekany
Affiliation:
Department of Colloid Chemistry, Attila József University, H-6720 Szeged, Hungary
K. Beneke
Affiliation:
Institute of Inorganic Chemistry, Kiel University, D-24098 Kiel, Germany
G. Lagaly
Affiliation:
Institute of Inorganic Chemistry, Kiel University, D-24098 Kiel, Germany
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Abstract

Pillared montmorillonite was used as an adsorbent for binary mixtures of hydrocarbons and alcohols (benzene/n-heptane; ethanol/cyclohexane; ethanol/toluene; propanol/ toluene). The adsorbent was prepared from the Na-form of a bentonite from Milos by reaction with polyhydroxoaluminium solutions. The adsorption behaviour of the pillared montmorillonite was characterized by the adsorption excess isotherms and the heats of immersion. Sorption capacities and wetting properties differed significantly from those of the Na-montmorillonite. Benzene was adsorbed preferentially from mixtures with n-heptane. Ethanol and propanol were also preferentially adsorbed from mixtures with cyclohexane and toluene but the curves showed azeotropic points at molar fractions of alcohols of 0.7-0.9. The calorimetric data revealed the partially hydrophobic character of the pillared montmorillonite. The heat of wetting of benzene or toluene on the pillared samples was distinctly higher than that of ethanol whereas ethanol gave the highest wetting enthalpies on Na-montmorillonite.

Type
Research Article
Information
Clay Minerals , Volume 32 , Issue 3 , September 1997 , pp. 331 - 339
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1997

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