Purification of extremely dilute ethanol aqueous solutions
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I would like to ask everyone: What methods can be used to purify water and pure ethanol from an ethanol-water solution with a mass concentration of 2–5%? Can we skip distillation? What conditions?
To improve purity, calcium oxide is usually added to the solution, followed by distillation; ethanol can be distilled off at around 77 degrees Celsius
Use distillation? The poster is referring to distillation, right? With such a low concentration, the energy consumption is quite high.
Ethanol and water are azeotropic, so distillation should work, but as mentioned above, the energy consumption might be high; perhaps the adsorption method could be tried
Adding calcium chloride first for dehydration followed by distillation should work, but it’s hard to say whether it’s worthwhile to recover anything from it
Our goal is to recycle water, not that small amount of ethanol.
{:3_50:} If you want to recover water, the volume of water will be very large; distillation and similar methods won’t work. Either extraction or molecular sieves are needed
What molecular sieve to use? 3A or 5A?
{:3_47:} Check the information by yourself or consult the manufacturer; {:3_49:} I’m just providing some ideas
You can try conducting a film evaporation experiment