What Is the Aniline Point?

The minimum temperature required for petroleum products and an equal volume of aniline to dissolve into a single liquid phase is called the aniline point.

Aniline point

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The minimum temperature required for petroleum products and an equal volume of aniline to dissolve into a single liquid phase is called the aniline point.

Aniline point refers to the minimum temperature required when petroleum products and an equal volume of aniline are mixed together. Aniline points are useful for characterizing pure hydrocarbons and analysis of hydrocarbon mixtures, but aniline points are most commonly used to evaluate aromatics content in hydrocarbon mixtures.

Minimum temperature at which equal volumes of petroleum products and aniline dissolve each other. The aniline point is related to the chemical composition. Paraffinic hydrocarbons are the highest, followed by cyclohexane and olefins, and aromatic hydrocarbons are the lowest. In homologues, the aniline point increases with the increase of the relative molecular mass of the hydrocarbons.