I would like to ask everyone about the calculation of multiple changes in the feed stream in Aspen
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Perform a simulation for solvent screening: for example, define a feed stream consisting of 100 compounds, of which 2 compounds remain unchanged; for the remaining 98 compounds, 97 have a flow rate of 0 while 1 has a fixed flow rate. After performing 98 calculations, output the results. How can this be achieved? Please discuss.
I’m not quite sure what you mean; what exactly do you want to calculate?
This post was last edited by muzili2008 on 2016-9-2 at 14:09: 1. Enter manually. (This method is equivalent to saying nothing.) 2. Use the Excel-link format, with the composition of the feed as a variable, and input it into Aspen via Excel. You just need to simply paste the listed components into the designated area. 3. Implement using Excel - VBA. Fully automatic.
What is actually done is solvent screening; that is, there are 98 solvents to choose from, in order to determine the impact of each of these 98 solvents on the K value of the original solvent. I want to implement automatic calculation
Thank you! I’ll check the materials on the interaction between Excel and Aspen, then we can discuss further
Theoretically, this is feasible, but in practice it still involves the issue of choosing a thermodynamic approach. With 98 solvent screenings, it is practically impossible to apply a single set of thermodynamic methods to them all; comparison results obtained using just one set of thermodynamic methods are basically unreliable. I’m really curious about what the original poster intends to do by screening 98 different solvents; common solvents used in industry can be easily understood by looking up relevant literature.
Bro, I’ve figured out the first two; is the third one a bit difficult? Are there any recommended materials?
People who understand the situation: I currently use a predictive UNIFAC model, which eliminates the need for interaction parameters; it’s just a preliminary screening process, and the number of solvents considered in this screening is well over 98. At present, the focus is on the academic value
Since it is a preliminary screening, the issue of insufficient precision in thermodynamic methods is not important; further investigation is needed later on
:The results obtained in this way have too low a level of reliability; it is recommended to try other methods.