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Recrystalizing compounds

iblewafuseinmymind

iblewafuseinmymind

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Jul 18, 2008
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Concerning hygroscopic tryptamines in salt form, if you had 1 Gram that you wanted to separate into 100mg using liquid measurement, having ten glass jars for the solution to settle in.. Im looking for opinions on what would be the BEST procedure for effectively recrystalizing a compound so that the appearance is the same as it was before introducing it to a solution. Despite how volatile it is is I was thinking ethanol may be a winner since I'll only be separating 1/10 of a gram ten times. Let me know what you think. Also if an ice bath/temperature control would help the process in any way let me know as well. I also have an assload of desiccant at my disposal.
 
might i ask why you are trying to do this?

it sounds like you don't have a scale and want to split 1g into ten portions, but want to keep it in powder form for extended storage...

get a scale.
 
Not sure about most appropriate solvent for tryptamines but on the recrystallisation i can give a few pointers. Ice baths will help but the main thing is picking the right solvent. Do you have filter paper and funnels for collection? When its crystallised and your going to pour, do it in one clean action (dont start then stop as you will lose materiel on the walls of your flask). The next thing is to wash you flask use the motherliquor that you recrystallised from as its the only thing you can be sure about you product not redisolving in. Next trick is to recover the crystals from your filter paper. There are 2 easy ways, get a plate and lay it on top of the funnel then flip and wait for it to dry. Let your funnel dry and the try to scratch it off once its dry. Having a vaccum pump will speed it up. If you tell me what your have (buchner funnels and pumps....etc) i can give you decent instructions. Or you might already know this all in which case ignore.
 
i think the key message here is

recrystallization is NOT for dividing something into uniform measures. that's what a scale is for.

recrystallization IS for improving the purity of a compound, at the cost of losing a portion of your product DOWN THE DRAIN. depending on your substance, solvent, and technique, it could be around 10-20% lost.
 
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