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Caffeine why, sublimation and not recrystallization?

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UAphenix:
Can anyone explain to me why sublimation would be used to purify crude caffeine as opposed to recrystallization?  I reallize that caffeine doesn't boil, it does sublime though.  I may completely wrong here, if you can't tell i am to say the least completely lost.  Any ideas would be very helpful.  Thanks

Mitch:
Its a better way to remove impurities.

UAphenix:
Thanks, what makes sublimation a better purifier than recrystallization?  I have been looking all over the web to find a comparison of the two, but have not had any luck.

xiankai:
crystalisation relies on the partial precipitation of a salt based on the difference in solubility at different temperatures.

with sublimation however, u can be assured that all the substance will sublime, just like how water boils completely beyond 100oC

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