Aniline Point

“The aniline point (temperature) of mineral oil indicates the solvency of the oil for some materials that are in contact with the oil. A high aniline point indicates a lower degree of aromaticity and a lower solvency for some material (e.g., rubber).”

(Quote from IEEE C57.106-2015)

What method is used to analyze the sample?


How do you interpret the results?

IEEE C57.106-2015

What do the results indicate?

“The aniline point (or mixed aniline point) is useful as an aid in the characterization of pure hydrocarbons and in the analysis of hydrocarbon mixtures. Aromatic hydrocarbons exhibit the lowest, and paraffins the highest values. Cyclopar- affins and olefins exhibit values that lie between those for paraffins and aromatics. In homologous series the aniline points increase with increasing molecular weight. Although it occasionally is used in combination with other physical prop- erties in correlative methods for hydrocarbon analysis, the aniline point is most often used to provide an estimate of the aromatic hydrocarbon content of mixtures.” (Quote from ASTM D611)

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