What absorbent do you use in your reabsorption towers?
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Are you using light diesel or heavy gasoline as the absorbent in your reabsorption towers? Feel free to share your experiences
For pipeline work, I see that we use light diesel in our processes
In diesel and heavy gasoline, there are still some light components present; I’m still concerned about back-mixing
Light firewood; some sources indicate that it can be used for top circulation.
Light diesel is primarily used; top circulation is also employed in some cases. This is because certain diesel components are heavy and have poor fluidity, which leads to high pressure drops in the reabsorption tower as well as serious liquid carryover in the dry gas. Shanghai Petrochemical saw significant improvement after switching to top circulation for use as the lean absorbent oil. In our newly designed heavy catalytic cracker units manufactured by SEI, top circulation is also incorporated into the process for using lean absorbent oil.
It depends on the specific medium; it can’t be generalized
Our unit uses light diesel to wash gasoline out of the lean gas; in practice, due to the vapor-liquid equilibrium, a certain amount of diesel remains in the dry gas. This oil is separated in the liquid separation tank for the refined dry gas
In heavy oil catalytic cracking, light diesel is used as the absorbent in the reabsorption tower
We also use light diesel produced at the fractionation unit. I’ve seen information stating that top-cycle oil can be used, but not many devices utilize it in practice