Ein Verfahren zur Bestimmung der Kohlenstoffketten‐Verteilung in Gemischen oxäthylierter aliphatischer Amine

Die technologischen Eigenschaften von Oxalkylierungsprodukten hangen vom Gesamtgehalt an Oxathylgruppen, von deren Homologen-Verteilung und von der Art des hydrophoben Molekulteils ab. Es wurde eine Methode entwickelt, mit deren Hilfe entschieden werden kann, aus welchen Fettaminen oder Fettamingemischen die hydrophobe Basis oxathylierter Amine besteht. Dabei wird durch Aufschlus mit 20% iger Salzsaure bei 180°C im Einschlusrohr aus dem Fettaminoxathylat die dem Basisamin aquivalente Menge an N-Alkylmorpholin gebildet. Das N-Alkylmorpholin bzw. das N-Alkylmorpholingemisch wird als freie Base gas-chromatographisch nach der Lange der N-Alkylkette getrennt. Die Methode kann auf gesattigte aliphatische Aminoxathylate direkt, auf ungesattigte jedoch erst nach einer Hydrierung angewandt werden. A Procedure for Determination of the Distribution of Carbon Chains in Mixtures of Alkoxylated Aliphatic Amines Technological properties of alkoxylated products depend on the total content of alkoxy groups, distribution of their homologues and on the nature of hydrophobic part of their molecules. A method was developed, which helps to ascertain as to which fatty amines or mixtures of fatty amines constitute the hydrophobic base of alkoxylated amines. In this test, N-alkyl morpholine in an amount which is equivalent to the basic amine is formed from alkoxylated fatty amine by digestion of the latter with 20% hydrochloric acid at 180°C in a sealed tube. Subsequently, the N-alkyl morpholine or the mixture of N-alkyl morpholines are separated as free bases according to the length of N-alkyl chain by gas chromatography. The method can be applied directly for saturated alkoxylated amines; the corresponding unsaturated compounds must, however, be hydrogenated prior to analysis.

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