Aspen Plus simulates the physical property parameters of NaOH solutions
Thread Content
I’m not sure if my simulation is correct. I’m not quite understanding why the values for H2O and NaOH in the diagram below are 50 kg/h each. Does anyone know the answer?
Someone else did this for me; the variable here is temperature. I wonder what I should do if I want the variable to represent the solubility of NaOH Previously, I changed the variable representing temperature to the solubility of NaOH, with the concentration ranging from 0.2 to 0.8. Now I don’t understand what 50 kg/h represents for each of the two substances in the top graph
To keep things consistent, since you start by entering the absolute flow rate, the values used in the sensitivity analysis should also be absolute flow rates. You can use a range of 20% to 80%; if the water flow rate remains at 50 kg/h, then 20% corresponds to 12.5 kg/h of NaOH, while 80% corresponds to 200 kg/h. Therefore, the variable to be adjusted should be the absolute flow rate of NaOH, with a range of 12.5 to 200 kg/h
Thank you. Could you please take a look for me? The first image below was created according to your instructions – is this acceptable? The second diagram shows that I want temperature to be the variable; in this case, water makes up 50% and NaOH also makes up 50%. This can be understood as the physical properties of a NaOH solution with a mass fraction of 50%. What if water constitutes 40% and NaOH constitutes 60% instead?
You’re right; if you need to change the rate, just do it directly in the logistics entry
Okay, thank you. I’m sorry, but I have another question: I was able to simulate a specific heat capacity of over 3 for a 50% NaOH solution, but using the same method, the specific heat capacity of a 50% K2CO3 solution came out to around 0.2 or 0.3. Do you know why this is the case?
An electrolyte model is required for accuracy
I’m using an electrolyte model; the results obtained from NAOH simulation are similar to those found in the tables, but this isn’t the case with K2CO3. I’m not sure what the difference is
That’s K2CO3. Aspe doesn’t have built-in equilibrium constants; you can check the reaction to see if they are provided there