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Author: Subject: Lab tips & tricks
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[*] posted on 30-6-2018 at 10:36

When finishing a liquid-liquid Iextraction gently swirl the sep. funnel to knock down last droplets from the walls.

When encountering emulsions gently heat the emulsion from the outside of the sep. funnel with a heat gun. The increased temperature increases the molecular movements causing the emulsion to break up faster. (note that occasionally cooling is beneficial as some but not all solvents become (more) immiscible below a certain point, see for instance the bahavior of MeCN-H2O. Sometimes solvents become less miscible by increasing the temperature (as is described in Vogel's). I do not know how ternary systems behave but I had the feeling that the DCM-MeCN-H2O system gave better and faster separations at or below 0C.

And finally for those ocd on purity, use the stopcock of a sep funnel to capture the thin film present at the interface and remember to remove the bottom layer through the bottom and the top layer through the top (after you've drained the bottom layer obviously).
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