What is aniline point in lubricants?
The aniline point of an oil is defined as the minimum temperature at which equal volumes of aniline (C. 5NH. ) and lubricant oil are miscible, i.e. form a single phase upon mixing.
What is the purpose of aniline point?
Aniline point is a measure of the aromaticity of an oil. It is the point at which the oil becomes miscible in aniline. Thus the lower the aniline point, the higher the aromatic content.
Why should good lubricating oil have high aniline point?
Aromatic hydrocarbons have a tendency to dissolve natural rubber and certain types of synthetic rubbers. Consequently, low aromatic content in the lubricant oil is desirable. A higher aniline point means a higher percentage of paraffinic hydrocarbons and hence, a lower percentage of aromatic hydrocarbons.
What are the advantages of aniline point to the industry?
Aniline point of a oil gives the indication of possible detoration of a rubber sealing, packaging etc. in contact with oil. The aromatic hydrocarbon has a tendency to dissolve certain type of rubber, so low aromatic content is desired for the oil.
What is an low 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 is cloud point oil?
Cloud point is the temperature at which wax (paraffin) begins to separate when oil chilled to a low temperature, and it serves as an important indicator of practical performance in automotive applications in low temperatures.
Is the property of lubricating oil due to which the oil particles stick with the metal surfaces?
Explanation: Adhesiveness is the property of lubricating oil due to which the oil particles stick with the metal surfaces while oiliness is the property which enables oil to spread over and adhere to the surface of the bearing.
Under what operating conditions are greases preferred to lubricating oils?
Solid lubricants are used for certain system where oil and grease are either undesirable or inadequate. When heavy machinery is to be operated at high speed and moderate load or at very high load and low speed. When the machine parts are not easily accessible. When machines are at high working temperature and pressure.
How can the oiliness of petroleum oil be increased?
Tile oiliness of petroleum oils can be increased by the addition of high molecular weight compounds like oleic acid, stearic acid, etc. Purification : Crude liquid petroleum oils contain lot of impurities (like wax, asphalt,etc.) and consequently, they have to be thoroughly purified before being put to use.
What is the importance of the aniline point of a petroleum fraction?
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 is viscosity of lubricating oil improved?
As temperature rises, viscosity decreases, and as temperature decreases, viscosity increases. As a result, to truly determine a lubricating oil’s quality, you must also consider its Viscosity Index (VI). Oils with a high VI will exhibit less change in viscosity at increased temperatures than oils with a lower VI.
How to measure the aniline point of rubber processing oil?
Aniline point of rubber processing oil was measured by a simple test and is done easily with available equipment in labratolary . In fact, this test solubility of aniline, an aromatic substance, measured in furfural extract rpo and other petroleum products. The solubility of other substances is related to the solubility of aniline.
What is the viscosity of paraffin oil?
Oil Type Aromatic Naphthenic Paraffinic Viscosity 3000 3000 3000 Flash Point, °F 430 450 575 Pour Point -This is the lowest temperature at which an oil can flow. The more straight chains in the molecular structure the higher the pour point.
What is the aniline point of hydraulic oil?
However, the test is usually done in a way that better communications with specific application to be.In hydraulic oils and lubricating oils, aniline point indicates the tendency of oil to soften and swell the rubber parts in contact with the oil. The lower aniline point, you tend to swell out more.
What is the difference between paraffin naphthenic and aniline point?
The highest and the lowest point of aromatic solubility of aniline (usually room temperature), respectively, whereas among paraffin naphthenic and aromatics are material. Significance of the results. Aniline point is that the solvent is an indicator of strength for solvents is very important.