Purification of Propionaldehyde


Objective

To purify propionaldehyde by distillation.

Procedure

Propionaldehyde (crude, 25mL) was distilled in a 100mL round bottom flask under a gentle flow of N2 gas. The distillate was collected as 3 fractions in graduated centrifuge tubes

Results

Propionaldehyde
Crude
HNMR
Fraction-2
HNMR

Conclusion
Distillation was successful.

Log
10:10 Started heating crude propionaldehyde on a heating mantle with variac in a 100ml round single neck round bottom flask under a gentle flow of N2 (one bubble a sec) The crude propionaldehyde was constantly stirred with a mag. stirrer. (Variac (V)-60 Temp (t) 25.
10:22 V-60; t-26
10:23 Reflux started 3 drops a sec.
10:29 V-60, t= 46
10:31 First drop in the fraction collector.
10:40 About 0.7mL (118-F1)distillate collected, changed the fraction collector.
10:40 V-60, t= 45
10:52 Collected about 0.8mL distillate in the fraction collector- 118-F2
10:55 Changed the fraction collector....
11 05 Turned off the variac, stopped heating. Third fraction still plugged in...don't need it

A picture of the setting.