Weird thing happened when doing an isopropyl wash

2021.12.05 09:07 coromtl Weird thing happened when doing an isopropyl wash

Hey everyone, so last night i decided to add an extra step to my purifying routine by adding an isopropyl alcohol wash on top of the trustee acetone wash.
Here’s how it went:
So i do the acetone wash, everything goes as usual. I break it up and let it dry for a few hours in an oven with just the pilot light on.
I then measure 25ml of 99.9% pure anhydrous isopropyl alcohol in a beaker (i had 2.5g of coke left after the acetone wash). I add the now dried blow to the alcohol and start stirring with a glass rod. Whole thing turns milky white with pearlescent swirls while i mix. What looks like some solids on the bottom when i look at the beaker from underneath seem to indicate some stuff did not dissolve which was to be expected, those are the unwanted adulterants. Or so i thought.
I pass the whole thing through some lab grade medium flow filter paper in a funnel and watch as crystal clear alcohol slowly drips onto a glass dish placed underneath. Halfway through i start getting a little worried because it seems as though way too much solid white powder is getting caught in the filter paper as it drains but i just figured maybe that coke was really dirty. It finished draining and that’s where i got confused.
There was SO MUCH caught in the filter paper, almost all of it. At this point i figured that this blow was complete crap but i figured i can do a purity test on the “adulterants” caught in the paper to confirm. I dry it for a few hours and then I do the test…..it indicates very high purity. I then evap the isopropyl in the dish and get left with clear goo (as expected) which i let crystallize and scraped off. That also was very high purity.
I don’t get it. The coke was supposed to completely dissolve in the alcohol and go right through the paper leaving only the adulterants trapped (or nothing at all). Almost 90% of the total weight got caught in the paper and it turns out its really pure stuff (thanks to the acetone wash). Why didn’t it all dissolve in the alcohol? Why did it get trapped? Is the filter paper i’m using too fine? But some of it did dissolve and did go through….IT DOESNT MAKE SENSE!!
I clearly used enough iso for the amount of coke i had. I followed all the steps correctly. The coke did not dissolve in the iso. Can someone with more experience please explain to me what the hell happened??
TLDR: high purity stuff did NOT dissolve in isopropyl alcohol and i don’t understand why.
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