I recently did a distillation of dicyclopentadiene (bp 166 °C) to get cyclopentadiene (bp 40 °C). The setup as instructed by my supervisor consisted of a simple water-cooled Liebig condenser. Oil bath temp. at 180 °C, receiving flask held at -78 °C by a dry ice-acetone bath:
Everything seemed to work fine, and I got plenty of cyclopentadiene after distilling for about 4 hours.
Now (writing the report) I went hunting for some procedure references, and the first hit was this one (http://www.orgsyn.org/demo.aspx?prep=CV4P0238):
My interpretation of these instructions look like this:
My questions (too many I know, sorry):
- Is my interpretation of that setup correct?
- What is the Friedrichs condenser for?
- Why should the water temp. be 50 °C? (and how important is it to get this temp. correct?)
- Where would I attach the "calcium chloride drying tube" and what is it anyway, what's it for and how important is it to have one?
- Other procedures I found attached Nitrogen to the setup. Why would I do that and how important is it?
- How would you interpret "efficient water-cooled condenser"?
- Finally, can you put me at ease and tell me that my simple distillation setup was just fine?