Why is the cold filter plugging point of hydrogenated diesel lower than its freezing point?
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Recently, the refined diesel produced by our company’s diesel hydrogenation unit had a freezing point of -11°C and a cold filter plugging point of -15°C as measured on the 17th; on the 18th, these values were -13°C for the freezing point and -14°C for the cold filter plugging point. For two consecutive days, the cold filter point was below the freezing point. Repeated calibrations and comparisons using laboratory testing equipment showed no issues, so it seems that the problem lies with the oil itself. According to the experienced workers, this situation occasionally occurred in the past, but it doesn’t make sense from a theoretical perspective. I’m asking the experts here – what’s going on?
There’s this thing too? Solidification does not occur because the waxes in the oil gradually accumulate together; first, the temperature at which it can no longer pass through the filter is known as the cold filter plugging point, and then solidification takes place. What size filter is used? . . . . . . . .
It’s related to the issue of making samples or taking samples; the speed at which samples are made can have an impact on this