Author Topic: Solvent recycling (mainly THF)  (Read 1677 times)

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  • Guest
Solvent recycling (mainly THF)
« on: June 24, 2004, 11:54:00 AM »

Is it possible to recycle thesolvents in this particular synth?

Im mainly thinking about the THF, but any info would be greatly appriciated.


  • Guest
Nice one
« Reply #1 on: June 24, 2004, 12:17:00 PM »
That a good questions to ask, I wondered the same...

Tough if you managed to recycle it, you'll have to stabilize it with BHT (2,6-Bis(1,1-dimethylethyl)-4-methylphenol)



  • Guest
Also, in the final step, it mentions : Re: The
« Reply #2 on: June 25, 2004, 09:37:00 PM »
Also, in the final step, it mentions :

The pooled organic extracts was dried over MgSO4, filtered and the solvent evaporated under vacuum.

Would someone be able to distill off the DCM, instead of evaporating it?

Thanks anyone


  • Guest
Recycling solvents
« Reply #3 on: June 29, 2004, 07:18:00 PM »
In regards to the recycling of THF, you might want to read this document:

Recovery of Tetrahydrofuran (THF)


You need to dry the THF fully, preferably by refluxing over sodium/benzophenone, but after the pre-drying outlined in the above document, it may be enough to reflux with molecular sieves or sodium/potassium hydroxide followed by distillation from a fresh batch of KOH/NaOH.

Would someone be able to distill off the DCM, instead of evaporating it?

Of course - distillation is evaporation, additionally followed by condensation of the vapors. From the perspective of the product it couldn't make less of a difference if the vapors was allowed to escape into the atmosphere, if they were condensed in a distillation reciever or even if you huffed them - it's all evaporation to begin with.