Separation of the high-molecular-weight hydrocarbons of petroleum by a combination of the methods of molecular distillation and chromatography

Summary

• 1. It is shown that a combination of the methods of molecular distillation and chromatography is highly effective in the separation of mixtures of the high-molecular-weight compounds of petroleum into basic structural groups of compounds having similar molecular weights.

• 2. Monocyclic aromatic compounds have the highest molecular weights and are condensed in the last fraction of the molecular distillation, whereas the paraffin-cycloparaffin compounds are concentrated in the first two fractions.

• 3. The sulfur compounds are concentrated in the bicyclic aromatic compounds, which indicates that most of the sulfur of the high-molecular-weight compounds of petroleum is found in compounds of the bicyclic aromatic structural groups.