Hello I have been producing THC oil and when I am finished with it I use my distillation rig that I have to reduce all the solvent possible then I re constitute it in ethanol to remove the remnants of the first solvent it is in. However I have an extraordinary hard time with my final purge getting to the acceptable PPM.
My stuff starts off as perfect as can be will look gold in small quantities and very translucent orange or red. However when in bulk I cannot seem to rid all the solvent and keep that quality. What I have resulted to is setting it up on a stir plate with a heat gun propped up blowing over it. While I believe this fully removes the solvent it absolutely darkens the oil to near black. When taken up in a dart it will still look reddish but I have had it near perfect gold and in the acceptable ethanol PPM.
I have never found a sure fire method. And although I lack a lot of equipment I was wondering if anyone could give me tips on exactly what to shoot for that would give me the best results. I was thinking a roto-vap is all i needed but from what I ahve seen most distillers start with a rotovap for a beginning process. So that must not be the only thing to totally rid solvent. Although it would help me out with the bulk of it.
Then there are vacuum ovens which I’ve never looked into but that’s the only thing I can picture working. Is the heat gun blowing over the oil turning it black in the process certainly degrading the oil?