Can the distribution coefficient be entered in Aspen’s extraction module to perform calculations?
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In other words, I have measured some phase equilibrium data, and I want to use these distribution coefficients for phase equilibrium to calculate the theoretical extraction efficiency; I need to figure out how to incorporate the distribution coefficients I’ve measured into the extraction module.
If there are only constant temperature and pressure along with point data, the distribution coefficient can be entered directly. If it is data on variable temperature and voltage, regression can be performed. Refer specifically to the user guide and help
So, under constant temperature and pressure conditions, is it sufficient to input only a, with all other temperature-related values being set to 0, or do they need to be entered in this equation as well? lnKLL=a+b/T+c*ln(T)+d*T
Yes, you understand that perfectly.
I have another question: if I know that the distribution coefficient of the product is 0.67, should I simply enter 0.67 in place of a, or do I need to convert it to its logarithmic form? And do we not need to worry about those solvents?
Conversion is definitely necessary, and this distribution coefficient is only applicable within the temperature, pressure, and concentration ranges of experimental measurements
In my process, there are four components. I know the distribution coefficients of the target product and the impurities, but for substances like water and benzene, which are extractants and solvents respectively, do I not need to indicate them?