Selective Adsorption of Organic Compounds from Solutions on Hyper-Cross-Linked Polystyrenes with Ultimate Degrees of Cross Linking

摘要

The adsorption selectivities of a series of organic compounds from solutions on hyper-cross-linked polystyrene networks (HPNs) with ultimate degrees of cross linking were studied by high performance liquid chromatography (HPLC). The thermodynamic characteristics of adsorption (TCA) of substances under study from water-organic solutions on such HPNs in the Henry region were determined. The TCAs of organic compounds on the HPNs under study as a function of their molecular structures are discussed. It was established that the magnitude of the Gibbs energy change upon adsorption increases with increasing the number of p-electrons in the adsorbed molecules in a series of both aromatic hydrocarbons and their sulfur-containing heterocyclic analogs. As an example, a model mixture of organic compounds was separated on HPNs by HPLC. It was shown that middle and heavy oil fractions can be fractionated on HPNs into the groups of mono-, di-, and tricyclic aromatic compounds.