How do I increase my aniline points?
The aniline point increases with paraffinicity and decreases with aromaticity. It also increases with molecular weight. Naphthenes and olefins show values that lie between those for paraffins and aromatics.
What is meant by aniline point?
Definition of aniline point : the lowest temperature at which aniline and a solvent (as gasoline) are completely miscible and which serves as an indication of the type of hydrocarbons present in the solvent, the content of aromatics being higher according as the temperature is lower.
What should be the aniline point of a good lubricant?
For high-aromatic products, such as aromatic extracts, the aniline point is around 20-40oC; for naphthenic base oils, 70-100oC depending on the degree of refining and viscosity; for Group I paraffinic base oil, 90 to 110oC; and for Group II-IV base oils, 100-130oC or higher.
What is aniline point mention its significance?
Abstract: The aniline point (AP) is an important physical property of a petroleum fraction. The AP gives an indication of the aromatic hydrocarbon content in a hydrocarbon mixture and can also be an indicator of the ignition point of a diesel fraction.
How are aniline points calculated?
Determination of aniline point Equal volumes of aniline and oil are stirred continuously in a test tube and heated until the two merge into a homogeneous solution. Heating is stopped and the tube is allowed to cool. The temperature at which the two phases separate out is recorded as aniline point.
How is aniline point measured?
The test indicates if an oil is likely to damage elastomers (rubber compounds) that come in contact with the oil. The aniline point is called the “aniline point temperature,” which is the lowest temperature at which equal volumes of aniline (C6H5NH2) and the oil form a single phase.
Where is aniline used?
Aniline is used in rubber accelerators and anti-oxidants, dyes and intermediates, photographic chemicals, as isocyanates for urethane foams, in pharmaceuticals, explosives, petroleum refining; and in production of diphenylamine, phenolics, herbicides and fungicides.
Why should aniline point be low?
The lower the aniline point, the greater is the content of aromatic compounds in the oil. The aniline point serves as a reasonable proxy for aromaticity of oils consisting mostly of saturated hydrocarbons (i.e. alkanes, paraffins) or unsaturated compounds (mostly aromatics).
What is aniline point of diesel?
The aniline point of diesel was found at the temperature of 94°C. By definition, the aniline point is the lowest temperature at which equal volume of aniline and oil are. completely miscible (clear). This method is suitable for transparent liquid samples having an initial boiling.
How do you test for aniline?
Procedure and mechanism. A dry sample is dissolved in a small volume of hydrochloric acid and briefly heated. A piece of paper, previously impregnated with aniline acetate, is exposed to the vapor from the sample solution. A bright pink color on the paper is positive for the presence of pentoses.