Hey everyone. So I did a nice A/B extraction which came out fine on the 1rst freeze precipitation but then I recrystallized with heptane and there was all this gooey residue over the crystals.
I dissolved the crystals a second time with naphtha and then allowed the saturated naphtha to cool in the fridge. I poured it of and a lot of goo was left at the bottom of the container.
I froze the naphtha and it formed some nice white crystals. The container used was to small, I think, and when I break apart larger chunks of crystals there is more goo inside.
I don't know what this goo was from but I think it was the bestine heptane. I have bought and used heptane before but on the east cost instead of the west and didn't have this problem. I am using vmp naphtha.
Can someone confirm that this is from one of the solvents? The goo has no color.
I am going to recrystallize again and try the same technique as before but this time freeze it in a large container.
Does someone know of another technique besides recrystallization for getting this goo out? It is soluble in naphtha at warm temperatures. Maybe a sodium carbonate wash?
I dissolved the crystals a second time with naphtha and then allowed the saturated naphtha to cool in the fridge. I poured it of and a lot of goo was left at the bottom of the container.
I froze the naphtha and it formed some nice white crystals. The container used was to small, I think, and when I break apart larger chunks of crystals there is more goo inside.
I don't know what this goo was from but I think it was the bestine heptane. I have bought and used heptane before but on the east cost instead of the west and didn't have this problem. I am using vmp naphtha.
Can someone confirm that this is from one of the solvents? The goo has no color.
I am going to recrystallize again and try the same technique as before but this time freeze it in a large container.
Does someone know of another technique besides recrystallization for getting this goo out? It is soluble in naphtha at warm temperatures. Maybe a sodium carbonate wash?
