I am currently simulating an acetaldehyde unit. However, I could not find the optimum reflux and number of stages because of the error saying "a minimum reflux of less than zero was calculated". How could I possibly solve that problem? Thanks
Try giving it reflux or a feed to the top of the column and slowly backing it out once you get the column to converge
Rick Manner Thanks for your answer. But I could not understand what you meant completely. Is it possible to explain with more detail.
Often a column fails to converge because it "dries up" - no liquid is presents somewhere in the column. If you add enough liquid to avoid the problem you can get a converged case. Once you have a converged case you can slowly back out the liquid you added and hopefully it will still converge when all of the liquid feed you added to get a converged case is removed.
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