Flüssigchromatographische stoffklassentrennung höhersiedender aromaten mit hilfe von charge-transfer-komplex bildenden kompaktphasen

Abstract

The outstanding suitability of the charge-transfer adsorption in the separation of compound classes by the formation of π—π complexes with higher boiling aromatic compounds of complicated petroleum hydrocarbons could be demonstrated. 2,4,6-Trinitrophenylamino groups bonded by propyl spacer bridges to spheric silica gel served as an preferred acceptor. On the basis of the previously introduced term for the compound class or group selectivity log σ G, the conditions for the separation of the aromatic compounds into subclasses as well as the influence of the eluent on the selectivity and on the number of theoretical plates are discussed. The behaviour of hetero compounds and the nature of relevant adsorptive interactions are dealt with. Various examples demonstrate that the chromatographic analysis of compound classes of higher hydrocarbons can supply important information about the behaviour of the mixtures under technological conditions.