An investigation into the azeotropes formed between the seven C2, C3, and C4 thiols and 28 different hydrocarbons has been carried out. As a result, 55 azeotropes between thiols and paraffins and naphthenes have been determined and their physical properties measured. Benzene formed no azeotropes with any of these thiols. The experimental results have been correlated and shown to fit satisfactorily equations recently put forward by Skolnik to cover

The relative adsorhabilities on silica gel of the different types of sulfur compounds occurring in petroleum distillates have been determined; synthetic blends were analyzed by filtration through a 175-cm. column of the gel. A description of the apparatus and the experimental procedure employed is given. All the sulfur compounds examined were found to be more strongly adsorbed than aromatic hydrocarbons, the order of increasing adsorbability being: aromatic hydrocarbons, thiophenes, alkanethiols, alkane disulfides, aromatic and cycloalkane thiols, alkane sulfides, and cyclic sulfides. The effect of boiling point and of molecular weight on adsorbability is discussed.The separation and identification of certain sulfur compounds present in extracts obtained either by caustic soda washing or sulfuric acid treatment of straight-run naphthas are described. Thirteen adsorptograms are given. ADSORPTION on silica gel has been developed to a con-

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