Sai,

Yes. It's safe.

I'd probably use a hot plate - just to minimize any disturbances from lifting it in/out of an oven. ~50 to 60degC for a few handful of minutes should suffice.

Thank you Dr. James Garry for your response. This helps a lot.

Dear Sai Phani Kiran Hota,

• The boiling temperature of pure ethanol is 174 degrees F or 78.2 degrees C. Certainly water and ethanol and all mixtures thereof will completelyevaporate without boiling given enough time. Water and ethanol form a postive azeotrope that is 95.6% ethanol and 4.4% water and boils at 78.2 degrees C.
• Liquid ethanol can be separated from a mixture of ethanol and water by fractional distillation. This method works because the liquids in the mixture have different boiling points. When the mixture is heated, one liquid evaporates before the other
• Ethanol will evaporate, dry it in hot air oven with inbult fan at 80 degree C for half an hour or so.

I hope I have answered your question.

With Best Wishes,

Samir G. Pandya

.

Thank you Dr. Samir G Pandya for your response. This has helped me with realizing with my attempt.

At what temperature Ethanol, Acetone & n-hexane can be evaporated at hot air oven??

Also mention time in your answer

Adnan,

The time to evaporate depends on the amount of the solvents you have, how well-coupled they are to the heater of the oven, and far too many other qualities to easily control, such as the air flow speed over the exposed solvent surface.

Acetone will evaporate first, as its boiling pt at 1bar is a shade under 60 degC.

Next, hexane (a little under 70degC) and then ethanol (a little under 80 degC).

Now, if these are mixed together, life becomes more complicated - as the boiling points will not be those of the pure liquids (how can they be!) - but if you're dealing with three separate baths, these figures will suffice.

Now, you might (reasonably) ask "How will I know when all of the solvent has vanished?" Well, put a thermocouple in the bath that holds the solvent - when the thermocouple starts warming *above* the boiling point of that solvent, you can be sure that there's no liquid left.

Are you washing an object, or are these solvents dissolving a compound of some sort?

am using two different plants with these three solvents(Ethanol, n_hexane & Acetone) to make extract of it. Rotary evaporator is best option but unfortunately in our lab only hot air oven are available!

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