Catalytic flocculent precipitation of crude diesel
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Recently, the heavy diesel oil obtained from the heavy diesel pump has contained flocculants, and the diesel at the sampling port is somewhat turbid. I’m not sure what the cause is
Your fractionation tower must have just experienced operational fluctuations! Hehe, I guess some dirty stuff like gum and asphaltenes must have come up from below, but I really don’t know the exact components!
I have encountered this situation too; it’s mainly due to the issue with the crude oil. In November, the batch of oil we purchased would often cause tripping during atmospheric pressure electrodesalting. Within a couple of days, the atmospheric pressure trays became clogged, and even the gasoline contained flocculent particles. When the normal slag is used in our catalytic process, it takes less than a week before diesel can no longer be distilled, while the gasoline becomes too volatile and its boiling point rises significantly. After cleaning the tower, the condition at the diesel extraction port improved.
But the diesel distillate volume is normal, and the dry point of gasoline is also normal. The tower was just cleaned a week ago, so it shouldn’t be salted up
Replying to the original poster: How long has this situation been going on for you? Check for any abnormalities at the temperature points in each section, as well as any changes in the return flow rate. Last time, the amount of diesel gradually decreased because the operator wasn’t paying attention; the diesel couldn’t flow out and ended up in the recirculation system, causing the oil there to turn yellow. Gasoline has a higher dry point. It’s not always high.
The dry point of gasoline has remained normal, while the dew point of diesel is slightly high; however, there is little change in the distillation volume
We have encountered this situation before; it is mainly a problem with the raw materials. We imported a batch of oil, and after adding a demulsifier, the diesel became cloudy with flocculent particles. When the diesel was heated, its color turned red and darker, and the flocculent particles disappeared. Crude oil cannot be changed either; the problem is resolved without adding demulsifiers.
Floor 7 is amazing; that’s really the case. Is it because it’s too difficult to remove water from crude oil that such demulsifiers are used?