| Evaporate Off the Methylene Chloride | Return to Flow Diagram |
|
©2001,2002 Daniel A. Straus |
With a thick-walled hose connected directly to the house
vacuum tap, remove the solvent in vacuo. (CAUTION:
Never heat a closed system - be sure the vacuum tap is turned on before
you apply any heat.)
Use a bit of heat during removal of the methylene chloride to offset the cooling due to evaporation. Do not allow the flask to get hot - you could evaporate off some of the eugenol if heated under vacuum. So, don't apply much heat when the solvent is nearly gone (i.e., when about 1 mL of liquid remains.) At this point, continue to apply vacuum at room temperature for at least 5 minutes to remove as much residual methylene chloride as possible. |
