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This post was last edited by *nren1 on 2020-1-13 at 10:22. Thank you to all the experts for their responses
The problem conditions are incomplete; not even the most basic feed composition is provided, so it’s impossible for others to answer it. If the feed contains 1% or 90% butanol, the answer is likely to be different! Without aiming for a high recovery rate of the butanol component, it should not be difficult to obtain a small amount of butanol with 99% purity through batch distillation.
Thank you, WQH518. Butanol accounts for 40% of the total volume of the solution. Is it possible to achieve a butanol purity of 99% with a yield of over 90% by using only simple distillation? I haven’t studied this topic in depth; even after looking at the principles of chemical engineering, I still don’t understand how to approach this issue
If the front and rear transition fractions are returned to the feed for re-distillation, it should not be too difficult to achieve a butanol recovery rate of 90% and a purity of 99%; it simply comes down to the number of theoretical plates in the distillation column and the reflux ratio.
Sir, our boss says that the boiling points of the two substances differ significantly, and he wants us to use only a distillation vessel heated to 130°C for separation, with the steam being directed out for condensation; there are no trays or recirculation systems involved. I don’t think it’s possible to achieve the results he’s asking for
Calculate it yourself using the flashing module in ASPEN or PRO/II process simulation software, and you’ll know whether what your boss is saying is reasonable. It is unlikely to be feasible to achieve a butanol recovery rate of 90% and a purity of 99% relying solely on the equilibrium flashing in the distillation kettle (equivalent to one theoretical stage).
It’s unlikely. With simple distillation, and under precise temperature control, the purity of the distillate can meet the requirements, but the recovery rate may not. It’s best to conduct a pilot test first