Seeking help with Aspen distillation simulation
Thread Content
How to adjust the bottom temperature of a tower without changing the tower pressure? Since the material at the bottom of the tower has a relatively high boiling point, in practical operations increasing the temperature at the bottom of the tower can also help maintain a constant tower pressure; but how should this be set in simulations?
Adjust the height or pressure drop of the tower packing
You should use Flash to perform bubble point calculations; that is, for a certain liquid composition and temperature at the bottom of the tower, calculate the corresponding pressure, and then set the tower pressure to this value.
There is no difference between simulation and reality; when you actually increase the bottom temperature of the tower, certain conditions will inevitably change (distillation volume, composition, condensation temperature, etc.). No matter how you adjust the other conditions in reality, that’s how they need to be set in Aspen. It’s impossible to increase the temperature at the bottom of the tower without any changes in other conditions.
This post was last edited by Lin Zi 2013 on 2019-9-26 at 16:45. In practice, the amount of material taken from the reactor should be reduced, which changes the composition of the material in the reactor; by setting a lower value for the amount of material taken from the reactor, the temperature increases while the pressure remains unchanged.