Relationship between diesel specific gravity and boiling range
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The specific gravity of the diesel changed from 825 to 833 before and after sample preparation, but the boiling range remained unchanged, as did the freezing point and cold filter plugging point. Has anyone encountered this situation? Is it a problem related to the sample analysis? . . Is there any inevitable relationship between specific gravity, boiling range, and freezing point? . .
Are there any aspects that might have been overlooked when conducting a sample analysis, such as the sample temperature or the selection of the densitometer? If the boiling range remains unchanged, it is generally unlikely that there are any changes in the components of the oil. The greater the specific gravity of the oil, the heavier it is, and the higher the temperatures at the corresponding points during the boiling range test. Lighter fractions have a low freezing point, while heavier fractions with a high wax content have a higher freezing point. Personal opinion, analysis error.
Yes, suddenly the specific gravity increased by so much, yet the boiling range remained unchanged. . .
Using the same person to test the same product, the results are different each time
That’s true; people are different, and samples are different as well. . .
1. It is possible for instruments to have errors. 2. It may have absorbed moisture (from the atmosphere). 3. Any change in temperature has a significant impact
Diesel is originally a mixture of components; a mixture cannot be compared to a single component