Atmospheric Equivalent Temperature (AET)

[mnfsbss3]

Dear all,

What is the function of AET? Why in Vacuum Distillation column need this figure to correspond to atmospheric value?


Regards,

 

[mbeychok]

mnfsbss3:

I am not sure that I understand your question. Assume, for example, that the bottom of a vacuum column is operating at about 380 [°]C. The equvalent boiling point temperature at atmospheric pressure (what you call the AET) would be higher than 380 [°]C ... how much higher depends on the vacuum pressure in the column.

The only reason I can think of for wanting to know the AET of the vacuum column bottom temperature is that it would inicate the initial atmospheric boiling point temperature of the vacuum tower bottoms.

That would also apply to and vacuum gas oils withdrawn from the vacuum tower as well. Knowing the AET of the vacuum column temperatures at their withdrawal points would provide an indication of their initial atmospheric boiling point temperatures.

You might find this online Citizendium encyclopedia article useful to read:

http://en.citizendium.org/wiki/Vacuum_distillation

Milton Beychok
(Visit me at www.air-dispersion.com)
.