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Montmorillonite-Asulam interactions: II. Catalytic decomposition of Asulam adsorbed on Mg-, Ba-, Ca-, Li-, Na-, K- and Cs-clay

Published online by Cambridge University Press:  09 July 2018

G. G. Ristori ,
P. Fusi  and
M. Franci
G. G. Ristori
Affiliation:
Centro di Studio per i Colloidi del Suolo del C.N.R.
P. Fusi
Affiliation:
Istituto di Chimica Agraria e Forestale dell'Università di Firenze, Piazzale delle Caseine 28, 50144 Firenze, Italy
M. Franci
Affiliation:
Centro di Studio per i Colloidi del Suolo del C.N.R.
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Abstract

Asulam (p-aminobenzenesulphonylmethylcarbamate) is adsorbed by alkaline and alkaline-earth cation saturated montmorillonites at room temperature either by protonation or by physical forces. On heating it decomposes to different products depending on the polarizing power of the exchange cation. On Mg–clay, sulphanilic and carbamic acid are obtained; the latter decomposes after equilibration at 100% relative humidity. In Ba– and Ca–systems, sulphanilamide and sulphanilic acid are produced with minor amounts of p–aminobenzenesulphonylcarbamate anion. Sulphanilamide is the main decomposition product in Na–, K–and Cs–systems. On Li–clay, decomposition of the Asulam results in the formation of p–aminobenzenesulphonylcarbamate anion and p–aminobenzenesulphonylcarbamic acid, probably as a consequence of the intermediate polarizing power of this cation.

Résumé

Résumé

L'asulam (p–aminobenzenesulfonylcarbamate de méthyle) est adsorbé à température ordinaire par des montmorillonites saturées en cations alcalins ou alcalino-terreux soit par protonation soit par adsorption physique. Lors du chauffage, la molécule se décompose en divers produits, fonctions du pouvoir polarisant du cation échangeable. Sur les argiles-Mg on obtient les acides sulfanilique et carbamique; ce dernier se décompose lorsqu'on équilibre le produit avec une atmosphère à 100 % d'humidité relative. En présence de Ba et Ca on produit l'acide sulfanilique et son amide avec des traces d'anions p–aminobenzenesulfonylcarbamate. L'amide est le produit principal de la décomposition dans les systèmes Na, K et Cs. Sur les argiles Li la décomposition de l'asulam forme l'anion p-aminobenzene-sulfonyl carbamate et l'acide correspondant vraisemblablement par suite du pouvoir polarisant intermédiaire de ce cation.

Kurzreferat

Kurzreferat

Asulam (p–aminobenzolsulphonylmethylcarbamat) wird bei Raumtemperatur entweder durch Protonisierung oder physikalische Kräfte absorbiert. Beim Erhitzen zerfällt es in verschiedene Produkte, welche von der Polarisierungsfähigkeit des Austauschkations abhängen. So erhält man bei Mg-Ton Sulphanil- und Carbamidsäure; letztere zerfällt nach Gleichgewicht-seinstellung bei 100% rel. Luftfeuchtigkeit. In Ba– und Ca–Systemen entstehen Sulphanilamide und Sulphanilsäure mit geringen Mengen des p–aminobenzolsulphonylcarbamat-Anions. Sulphanilamid stellt das Hauptzersetzungsprodukt in Na–, K– und Cs-Systemen dar. Mit Li-Ton führt der Asulamabbau zur Bildung von p-Aminobenzolsulphonylcarbamidsäure. Wahrscheinlich ist dies die Konsequenz der mittleren Polarisationskraft dieses Kations.

Resumen

Resumen

El Asulam (p–aminobencenosulfonil-metilcarbamato) es adsorbido a temperatura ambiente por montmorillonitas saturadas con cationes alcalinos y alcalinotérreos, por protonación o adsorción fisica. El calor descompone el complejo obteniéndose diferentes productos dependiendo del poder polarizante del catión de cambio. En la arcilla magnésica se obtienen los ácidos sulfonílico y carbámico, siendo este último descompuesto cuando la muestra se pone en equilibrio a 100% humedad relativa. En los sistemas Ca y Ba se producen la sulfanilamida, el ácido sulfanílico y en menor cantidad el anión p-aminobencenosulfonilcarbamato. La sulfanilamida es el principal producto de descomposición en los sistemas Na, K y Cs. En la arcilla lítica, la descomposición del Asulam da lugar a la formación del anión p–aminobencenosulfonil carbamato y del ácido p–aminobencenosulfonilcarbámico, probablemente debido al valor intermedio del poder polarizante de este catión.

Type
Research Article
Information
Clay Minerals , Volume 16 , Issue 2 , June 1981 , pp. 125 - 137
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1981

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