Abstract
The connection between the composition of the volatile fraction and the solubility of coal tar pitches as a whole is tested. Nine coal tar pitches were extracted with several organic solvents, using the same procedure, and the extract yields were determined. The same solubility sequence of these pitches was found for all the solvents, and the most soluble pitches had the smallest C H atomic ratio. The volatile fraction of the pyridine extract of each pitch was characterized quantitatively and the relations between the composition of this fraction and pitch solubility were examined. It was found that pitch solubility was closely related to the concentration ratio of a benzo-derivative of a polycyclic aromatic compound and its parent hydrocarbon. It is concluded that a study of the volatile fraction is a valuable approach towards understanding the properties and behaviour of coal tar pitches.
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