Solvent Recovery

[charlesvb]

I have been looking into distillation as a method for recovering an ACN and water mixture and I understand I will not be able to get high purity ACN using this method. My question is can this 85% or so ACN water mixture be used in a mobile phase that was going to be a mixture of the two already as long as the lower percentage of ACN is accounted for and scaled up? Should this mixture act any differently than if HPLC grades of each were mixed in the same proportions?

[mrozuf]

After distilation you can put your solution AcN/water into the freezer (in PTTFE containers best)

Water will freez out, and you can remove ice and AcN left.
Of course it is not 100% pure - to be honest I don't remeber the %.

That's what i used to do.
Method is more time consuming, and you cannot do it in "production" scale

We were doing it in 2x 5L containers in the standard freezer