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Crude gasoline enters the absorption tower to absorb the C3 and C4 components – what is the principle behind this? (Is it because liquefied petroleum gas dissolves easily in crude gasoline?) Why is some of the stabilized gasoline from the stabilizer tower also used as an absorbent in the absorption tower?). Another question: are the feed components of the cracking tower C3, C4, and C5?
The difference between absorption and distillation is that the former relies on the different solubilities of the various components in a mixture in a solvent to achieve separation； The latter achieves separation by taking advantage of the different volatilities of the various components in the mixture. Common points of absorption and distillation: both are equilibrium problems involving gas and liquid phases. The determination of its phase equilibrium constant can be referred to in relevant literature. However, from the perspective of the mass exchange process, the absorption process involves only the mass transfer of the component to be absorbed from the gas phase into the absorbent, whereas the distillation process includes not only the mass transfer of the heavier components in the gas phase into the liquid phase but also the mass transfer of the lighter components in the liquid phase into the gas phase. Therefore, the absorption process is unidirectional mass transfer, while the distillation process is bidirectional mass transfer. It might be a bit complicated, but I think understanding these concepts will help you grasp the question you’ve asked! For the second question, I’ll ask you in return: is the product discharged from the distillation tower called deethanized gasoline? What is its feed? I can’t find the data on gasoline at the bottom of the absorber and deethanized gasoline for now; once I find it, I’ll post it so you can take a look and understand!
The feed to the cracking tower should be the liquid phase coming out of the separation tank (C3, C4, C5?) ), Well, in any case, there is an oil-gas separator at the turbine outlet; the substance that comes out from the bottom of the tank…
To avoid misunderstandings due to different terms used by people, it is generally called condensed oil!
Crude gasoline enters the absorption tower to absorb the C3 and C4 components – what is the principle behind this? (Is it because liquefied petroleum gas dissolves easily in crude gasoline?) Why is some of the stabilized gasoline from the stabilizer tower also used as an absorbent in the absorption tower?). Reply: At certain temperatures and pressures, the solubilities of C3 and C4 components in gasoline components vary; this is based on the principles of absorption. The reason why stabilized gasoline is used as an absorbent in the absorption tower is to ensure a high liquid-to-gas ratio, thereby enhancing the absorption efficiency (since stabilized gasoline does not contain C3 and C4 components). Otherwise, the size of the absorption and desorption equipment would increase and the operating conditions would become more stringent. Another question: are the feed components of the cracking tower C3, C4, and C5? Reply: The feed components to the desorption tower include dry gas C2 components, liquefied gas C3 and C4 components, as well as gasoline C5-C8 components. The above are my personal opinions.
If you’re asking why crude gasoline can absorb liquefied gas, the principle is similar substances tend to mix with each other. As for the principle behind absorption and desorption, it’s covered in technical Q&A; the guy above is right – stable gasoline seems to have a higher solubility for C3 and C4 compounds
Analyze the feed composition of the tower: a small amount of C1 and C2； C3, C4, and C5-C11 gasoline components.