I want distillation ethyl ether with benzophenone and sodium.
However, as many as sodium and benzophenone I added, Turquoise color was not changed to deep blue or purple.
How can I distill it?
Dear Sungbin Park thank you for your interesting technical question. I assume that your diethyl ether initially contained too much water. In such case you can distill off as much of the diethyl ether as possible and add fresh benzophenone and sodium. After some time the deep clue color of the benzophenone kettle should develop.
In context please also have a look at the following useful article:
Revisiting of Benzophenone Ketyl Still: Use of a Sodium Dispersion for the Preparation of Anhydrous Solvents
Article Revisiting of Benzophenone Ketyl Still: Use of a Sodium Disp...
(see attached pdf file)
We can purify diethyl ether from its most usual impurities by shaking with a solution of 3 g FeSO4 + 3 cm3 conc. H2SO4 + 55 cm3 H2O, and/or with 10 wt% Na2SO3 aq. ― approx. 1 vol% washing solution : ether, repeatedly. That should be followed by washing with distilled water, drying with anhydrous CaCl2 (1 day), and filtering. Alternatively, it can be dried with activated anhydrous alumina or with 4Å molecular sieves. Further purification (if required) can be achieved by distillation, possibly over sodium wire or P2O5.
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