Flash simulation

[IliasBouchkira]

Hi everyone

Is there any examples in the forum on how to carry out a Flash calculation (vapor liquid equilibrium)? The purpose is to determine phases compositions and if possible partial pressures..

Many thanks in advance

Ilias

[dlparkhurst]

I'm not sure whether you want to heat of cool your solution. Here is an example of water in equilibrium with halite that is heated to 150 C (in the absence of halite solid). The solution is in contact with a 1 liter gas head space. The resulting system has a pressure of 3.6 atm due to H2O(g) in the head space, and the solution is undersaturated with halite, so no halite precipitates.

Code: [Select]

SOLUTION
EQUILIBRIUM_PHASES 1
Halite 0 10
SAVE solution 1
END
USE solution 1
EQUILIBRIUM_PHASES 1
Halite 0 0
REACTION_TEMPERATURE
150
GAS_PHASE
-fixed_volume
-volume 1
H2O(g) 0
END