What are the differences between the fractionation tower of a atmospheric and vacuum distillation unit and the main fractionation tower of a catalytic cracking unit?
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I’m not sure what the main differences in the operations are. Thank you!
This, this. The principle of distillation is the same, but when it comes to specific operations, there is a big difference.
The internal setup differs slightly, but the main principle in terms of control is maintaining temperature. The catalytic fractionation tower is relatively complex, involving reactions, absorption and stabilization processes, as well as large-scale equipment, whereas the atmospheric pressure tower is simpler.
Speaking only from the aspects of structure and principle, the process will not be discussed here. The similarity is that neither has a stripping section; there is a top cooling reflux and a middle section reflux. The difference is that the feed section of the catalytic fractionation tower includes a superheating removal section, and the excess heat throughout the tower is much greater than that in a atmospheric pressure tower