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The Adsorption of n-Aliphatic Alcohols from Dilute Aqueous Solutions on RNH3-Montmorillonites. II. Interlamellar Association of the Adsorbate

Published online by Cambridge University Press:  01 July 2024

Michel S. Stul ,
Jan B. Uytterhoeven ,
Jozef De Bock  and
Pierre L. Huyskens
Michel S. Stul
Affiliation:
Centrum voor Oppervlaktescheikunde en Kolloïdale Scheikunde, Katholieke Universiteit Leuven, De Croylaan 42, B-3030, Leuven, (Heverlee), Belgium
Jan B. Uytterhoeven
Affiliation:
Centrum voor Oppervlaktescheikunde en Kolloïdale Scheikunde, Katholieke Universiteit Leuven, De Croylaan 42, B-3030, Leuven, (Heverlee), Belgium
Jozef De Bock
Affiliation:
Centrum voor Oppervlaktescheikunde en Kolloïdale Scheikunde, Katholieke Universiteit Leuven, De Croylaan 42, B-3030, Leuven, (Heverlee), Belgium
Pierre L. Huyskens
Affiliation:
Laboratorium voor Fysicochemie en Stralingschemie, Katholieke Universiteit Leuven, Celestijnenlaan 200D, B-3030, Leuven, (Heverlee), Belgium
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Abstract

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The adsorption of butanol, hexanol, and octanol on alkylammonium montmorillonites of different chain length is similar to the distribution of alcohol between an organic solvent and water in bulk solution. Successive expansion of the clay layers starts at critical alcohol/cation ratios of 0.6 or lower which are biased mean values due to the heterogeneity of the cation density of the mineral. In the interlamellar phase autoassociation of the alcohols occurs in contrast to their behavior in aqueous solution. The intrinsic association constants (kM ~ 7) are of the same magnitude of the values found in cyclohexane. The alcohols can associate with molecules fixed on specific sites of the mineral and on free monomers. The ratio of fixed to free monomers is of the order of 10/1.

Резюме

Резюме

Скорости дегидроксилирования смектитов, насыщенных продуктами разложения Ni(фен)3SO4 от 2 до 4 раз выше, чем для глин без теплостойких прослоев. Эти результаты показы¬вают, что эти включения, разделяя слои глины, обеспечивают лучшие условия для потери воды в течение процесса дегидроксилирования.

Resümee

Resümee

Die Adsorption von Butanol, Hexanol, und Oktanol auf Alkylammonium-Montmorillonite mit unterschiedlicher Kettenlänge ist der Verteilung von Alkohol zwischen organischem Lösungsmittel und Wasser in Massenlösungen ähnlich. Aufeinanderfolgende Ausdehnung der Tonschichten beginnt bei kritischen Alkohol/Kation Verhältnissen von 0,6 oder niedriger, was allerdings wegen der Heterogenität der Kationendichte des Minerals voreingenommene, durchschnittliche Werte sind. In Kontrast zu ihrem Benehmen in wäßrigen Lösungen kommt in der interlamellaren Phase Auto-Assoziation der Alkohole vor. Die wahren Assoziationskonstanten (KM ~ 7) sind von derselbem Größe wie die Werte, die in Cyclo-hexan gefunden werden. Die Alkohole können mit molekülen assozieren, die auf spezifischen Plätzen der Mineralien und auf freien Monomeren sitzen. Das Verhältnis von festen und freien Monomeren ist 10/1.

Résumé

Résumé

L'adsorption de butanol, d'hexanol, et d'octanol sur des argiles alkylammonium de longueurs de chaînes différentes peut être comparée à la distribution d'alcool entre un solvent organique et l'eau. L'expansion successive des feuillets de l'argile commence à un rapport critique alcool/cation de 0,6 ou moindre qui sont pourtant des valeurs moyennes déformées vu l'hétérogénéité de la densité de charge du minéral. Il y a de l'auto-association des alcools dans l'espace interlamellaire en contraste avec leur comportement en solution aqueuse. Les constantes d'association intrinsèques (KM ~ 7) atteignent la même grandeur que celle trouvée dans le cyclohexane. Les alcools peuvent s'associer avec les molécules fixées sur des places spécifiques du minéral ou sur les monomères libres. Le rapport des monomères fixes au libres est de l'ordre de 10/1.

Keywords

Alcohol adsorptionAlkylammonium claysIntercalatesMontmorillonite
Type
Research Article
Information
Clays and Clay Minerals , Volume 27 , Issue 5 , October 1979 , pp. 377 - 386
Copyright
Copyright © 1979, The Clay Minerals Society

Footnotes

1

Union Carbide Corporation, Antwerp.

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