The issue of the dry point in catalytic gasoline
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Old question: Why is the dry point of catalyzed crude steam higher than that of steady-state steam? (Our unit’s dry point of the crude steam is 215°C, and that of the stabilized steam is 195°C.) I can’t figure it out. I’ve read many posts on the forum today and also asked the experienced workers at the plant, but I still haven’t understood it. I hope all the experts can offer some guidance; thank you!
It takes about 2 hours for the crude gasoline at the same time to reach the stabilization unit; our unit is set up in such a way that there is a time difference
I didn’t ask if the same machine is used for testing crude steam and steady steam
I didn’t ask if the same machine is used for testing crude steam and steady steam
The simplest reason is that crude gasoline is distilled at a pressure of around 90 kPa, while refined gasoline is distilled at 1.0 MPa; refined gasoline is relatively more volatile. It is evident during sampling that, under the same distillation conditions, refined gasoline volatilizes more easily, which results in a lower dry point. Second, during sampling, crude gasoline is yellowish in color while stabilized gasoline is white, indicating that the composition of crude gasoline is heavier than that of stabilized gasoline, and therefore its dry point is higher. Thirdly, crude gasoline has a complex composition; its sulfur content is much higher than that of stabilized gasoline, which also affects the dry point. Fourth is the change in intermolecular forces. Crude gasoline has a wide range of components and a complex composition, resulting in strong intermolecular forces that make it difficult to vaporize. In contrast, liquefied gas is influenced only by liquefaction factors; the bonding force between light components and heavy components is stronger, which has a significant impact on the heavy components and enhances their evaporation capacity. Therefore, the dry point of the stable steam decreases
Your stabilizer tower can also control the dry point of gasoline – that’s amazing. Crude gasoline is yellow due to sulfur content.
The last edit to this post was made by Refiner on 2017-10-30 at 16:13. The claim that high pressure leads to higher gasoline volatility refers to a higher C4 content in the gasoline; it has nothing to do with the dry point
It’s probably a matter of time difference; looking at the overall trend, it’s not like that
It shouldn’t be a matter of a time difference, as the dry point of crude gasoline isn’t low enough to reach the value of a stable dry point
It’s definitely not a matter of a time difference, because this phenomenon has always existed (the dry point of the crude steam in our system is always higher than that of the steady steam)
It’s a machine! I’m just wondering where the heavy components of crude oil go?