The density of reduced-four-line oil is greater than that of reduced-five-line oil; what are the common reasons for this?
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The company had not produced Grade 5 lubricant before; recently, crude oil with a density of 0.88 was mixed on a 1:1 basis with the usual crude oil having a density of 0.96. Sampling later showed that the density of Grade 4 lubricant was about 0.002 lower than that of Grade 5 lubricant. Grade 4 lubricant contains a higher amount of wax, which results in significantly poorer flow properties compared to Grade 5 lubricant. The amount of washing oil used decreased from 7 tons to 5 tons, and there was little change in the density of the lubricant produced in both lines
It’s possible to get a reduction of five, with a full reduction of four. When you reduce by four, the amount of distillate produced is higher and the temperature is greater; when you reduce by five, delivery isn’t provided, and it’s used for recycling only, which naturally results in a lower volume
A tower, with sections from top to bottom, from which the materials inside the tower are drawn out on the sides. At the very top is the tower top, and then there are the first layer, the second layer; the lower one the higher the boiling point and the heavier the components
At Unit 5, delivery is currently being carried out; the liquid level has been checked and it is not at full level. Previously, the distillation temperature at Unit 5 was lower than that at Unit 4, but after adjustments were made, the distillation temperature increased. However, the density of Unit 5 remains lower than that of Unit 4
This is usually the case, but now it’s happening that the lower one is even less severe than the upper one: L
Adjust the reflux flow rate; the reflux is not well controlled, and the temperature gradient within the tower has not been established properly
For questions like this, it’s best to provide the parameters of the tower, such as temperatures and flow rates in various locations, so that it’s easier for everyone to analyze them.