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Specific gravity (liquid)
| Oil glossary |
The ratio of the weight of a given volume of liquid to the weight of an equal volume of water.
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Spectrographic analysis, английский
Determines the concentration of elements represented in the entrained fluid contaminant.
Solvent extraction, английский
- A refining process used to separate components (unsaturated hydrocarbons) from lube distillates in order to improve the oil’s oxidation stability, viscosity index, and response to additives. the oil and the solvent extraction media are mixed in an extraction tower, resulting in the formation of two phases: a heavy phase consisting of the undesirable unsaturates dissolved in the solvent. and a lighter phase consisting of a high quality oil with some solvent dissolved in it. the phases are separated and the solvent recovered from each by distillation.
- The most common method for extracting fragrance from natural materials, solvent extraction consists of submerging/macerating the raw material in a chemical solvent (such as hexane) and then vacuum-separating the now extracted fragrant material from the solvent. this produces a solid known as a concrete, which can then be dissolved and distilled again with alcohol to produce an absolute.
- A refinery process that utilizes oil and a polar solvent like phenol, n-methyl pyrolidone, furfural, etc., to selectively separate unsaturates from lubricant distillates, in order to improve properties such as oxidation stability, viscosity index and additive response.
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