Hi Mhamdi Khaled
For your help:
With the flash curve calculated at atmospheric pressure. To plot this EFD at any other pressure take the 50 %vol temperature, and using the vapor pressure curves for hydrocarbons (see Figure 3 .A. 1 in the appendix) read off the temperature at the desired pressure. Draw the EFV curve through this new temperature parallel to the atmospheric curve. The flash zone temperature is the temperature at the % distilled On the partial pressure curve.
According the: Handbook of Petroleum Processing by Jones, Pujadó, Chapter 3
Attached the graph mentioned above Figure 3.A.1
Good luck
Fausto
Edited by Profe, 28 May 2015 - 08:33 AM.