I am trying to model wax precipitation from an alkane mixture. Is there any possibility in DWSIM to model an additional vapor phase in the SLE flash algorithm implemented in DWSIM? Or would it be necessary to write a new flash algorithm when solving this problem?
Thanks for the info in advance!
Best regards, Benjamin
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You need to select flash algorithm "NestedLoops SVLE - Eutectic". The other algorithm usually is not appilcable, depending on you system.
Your component which is to be precipitaded needs a proper definition of the relevant pure component properties: Temperature of fusion Enthalpy of fusion
* Heat capacity of solid and liquid
If you don't have exact data of your wax you can adjust enthalpy of fusion to adapt the inclination of the solubility curve. With temperatur of fusion you may move the curve up and down. You will need to calculate a solubility curve of the complete temperature range to see what the curve looks like and to adjust to experimental data.
As a first guess you can define both heat capacities to be identical. But if you own experimental data you may define them. In this case you will have to adjust the two other parameters again.
Gregor
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
Hello all,
I am trying to model wax precipitation from an alkane mixture. Is there any possibility in DWSIM to model an additional vapor phase in the SLE flash algorithm implemented in DWSIM? Or would it be necessary to write a new flash algorithm when solving this problem?
Thanks for the info in advance!
Best regards, Benjamin
Hi Benjamin,
this is already possible.
You need to select flash algorithm "NestedLoops SVLE - Eutectic". The other algorithm usually is not appilcable, depending on you system.
Your component which is to be precipitaded needs a proper definition of the relevant pure component properties:
Temperature of fusion
Enthalpy of fusion
* Heat capacity of solid and liquid
Further details have a look into the code:
https://github.com/DanWBR/dwsim4/blob/master/DWSIM.Thermodynamics/Flash%20Algorithms/NestedLoopsSLE.vb#L371
If you don't have exact data of your wax you can adjust enthalpy of fusion to adapt the inclination of the solubility curve. With temperatur of fusion you may move the curve up and down. You will need to calculate a solubility curve of the complete temperature range to see what the curve looks like and to adjust to experimental data.
As a first guess you can define both heat capacities to be identical. But if you own experimental data you may define them. In this case you will have to adjust the two other parameters again.
Gregor