Extractive distillation column
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After my simulation was successful, the product that should have come out from the top of the tower actually came out from the bottom of the tower, and the product that should have come out from the bottom of the tower came out from the top. What’s going on?
In a few systems, the relative volatility reverses upon the addition of an extractant. That is, with the original volatility order of A/B/S (extractants), A should be collected from the top of Tower 1, B from the top of Tower 2, and S from the bottom of Tower 2 as a circulating solvent ； However, in a few systems, B is taken out from the top of Tower 1, A is taken out from the top of Tower 2, and S is taken out from the bottom of Tower 2 as the circulating solvent. It mainly depends on your physical properties; you can take a look at the remaining curve of the ternary phase diagram function. I wonder what system you use?