How to set the parameters of the batchfrac model for the intermediate fractional distillation column in Aspen?
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I haven’t done intermittent mode before, so I’m not very familiar with the parameter settings. Please advise
The settings inside are actually similar to those in RasFrac. The key is to understand the setting in the stop criterion: whether to choose stop from above or stop from below. In the operation step, additional steps can be added to enable distillation under different process conditions
ASPEN’s batch distillation column model BatchFrac doesn’t seem to be very useful; it has too few functions and often fails to converge.
Intermittent simulation is rather complicated; besides the stop criterion, it seems that there is also a requirement to set the liquid holding capacity. Intermittent use is still rare
Aspen is not omnipotent; although it is comprehensive, some of its features are not very practical.
I’m encountering an issue where I can’t enter the components of the initial material (the input field after “initial charge” is grayed out). I don’t know why
The course materials are being prepared; I am currently working on it
The liquid holding capacity can be set to a relatively low value, such as some negative power of 10; it can also be set to 0. However, setting it to 0 can sometimes make convergence difficult. Last edited by *aox1013 on 2009-4-30 09:00]
I’ve been working on BATCH FRAC lately, and it seems to be going well. There are no issues with the termination criteria, the liquid holdup, the initial composition, or convergence. I also tried various property estimation methods; two of the properties I used were estimated, so the separation wasn’t very accurate!
Reply to 10# wuwawa: Do you know how to set it up so as to obtain the variation of components inside the tower over time? For example, if I have three components, and through two processing steps two products are obtained at the top of the tower, with a transitional component in between, how should it be set up so that I can obtain the values of these three components within the tower over time?