NP solvent stirring time

[Sandgrease]

In STB extraction, how long should one stir heptane before letting the basified/nonpolar solutions seperate? I've done 5 mins and 10mins of nonstop stirring with a big metal spoon and things have gone fine but looking for others' experiences.

 

[332211]

hmmm, for the pull from the basic solution i would recommend naphta, bigger yield. heptane is good in the recrystalisation step, it is more selective and leaves more impurities behind.

if you can, use glas or wood to stir a chopstick did well for me. metal might be corroded by the basic solution.

good luck

 

[expandaneum]

heptane is fine, depending on your source of naphtha it will contain a large part of heptane anyway.

Just search the forum for your answer its there for sure.

 

[Sandgrease]

Chose the heptane over the naphtha because of its selectivity. Didn't want as many plant fats and whatnot.