7.25: Rotary Evaporation
- Page ID
- 97229
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Be sure there is ice in the water circulator (if used). Fill a round bottomed flask no greater than half-full. Connect to the bump trap with a plastic clip. |
Lower the flask into the water bath to submerge the liquid (don't submerge the plastic clip). Turn on the vacuum source (vacuum will hiss). Rotate the flask at a moderate rate (one-third the maximum value). |
Close the stopcock in the apparatus (hissing will stop). Evaporate until solid forms or liquid level doesn't appear to change anymore, then evaporate an extra few minutes for good measure. |
To stop evaporation, reverse all steps:
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