Abstract
The separation of mixtures of aromatic hydrocarbons and heterocyclic compounds was carried out on thin layers of silica gel or alumina. The following solvents were used: n-hexane, carbon tetrachloride, trichloroethylene and dichloroethane. Detection was carried out by spraying with formaldehyde-sulphuric acid, with tetracyanoethylene solutions and by examination in U.V. light. The RF values of 30 compounds are listed in tables, and three chromatograms of more complicated mixtures met with in coal-tar analysis are given as illustration of the method.
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