Seeking advice on the simulation of salt-assisted distillation in an ethanol-water system
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Adding salts such as calcium chloride serves to change the relative volatility of ethanol and water, and can even eliminate the azeotrope. May I ask in what form should salts be added during the simulation (as pure solids or dissolved in some solvent)? What to choose for the thermodynamic approach? Are there any references I can consult for solid simulation processing? For another example, the crystal modeling issue: I asked about it several times on the forum, but no one answered me on how to do it Thank you; I hope experts will kindly share their insights!
I am also studying the simulation of salt-assisted distillation in ethanol-water systems. Are you using Aspen? I don’t know how to enable batch distillation in Aspen; I was wondering if anyone upstairs knows
Your question is quite difficult, at least it is difficult for me. In fact, anything related to solids is challenging; thermodynamics is well-developed in the context of gases and liquids, but it’s not as advanced when it comes to solids. Let me look up some information first to see if I can give you some suggestions.
4# lsrwan I also think that things related to solids are difficult and not necessarily accurate; it’s great to have met an expert like you. Thank you for your help. Thank you! !
http://bbs.hcbbs.com/thread-472082-1-1.html There are many Aspen-related materials here; there’s also an Aspen advanced simulation – I haven’t downloaded it yet. Please check if it’s available, and then I have another question: is salt distillation always batch distillation? http://bbs.hcbbs.com/thread-326235-1-1.html There are similar questions there; take a look.
6# lsrwan Thank you for your thoughtful help! Salt-added distillation is not only a batch process but also a continuous one; salt can be added at the reflux point, either as solid salt or as a salt solution. The salt solution is taken out from the bottom of the tower and then recovered through evaporation. I can handle the evaporation and recovery part myself. My main problem is that I’m not clear on how, in Aspen, the effect of salt on volatility can be represented. Extraction distillation is similar to salt-added distillation in that volatility is altered through the liquid-liquid interaction coefficient; however, once a solid is used, things change completely
Why isn’t anyone discussing this in these past two days? I’ve been trying to solve it, but I haven’t succeeded yet
Have any of you upstairs read any literature on salt-added distillation simulation?
9# LTY I’ve seen some of them, in both Chinese and English. In principle, I think Aspen can do it
Saline distillation should disrupt the original gas-liquid equilibrium! ! It needs to be measured experimentally, and then regression simulation! !