Discussion in 'Concentrates and Extracts' started by ander20n, Oct 9, 2018.
99.98% out of last batch. pretty happy.
Have you seen the new fake Chinese THCa they claim many are using to sell?
What technique did you use?
Short path distillation?
Whatever the method it is clear you know what you are doing.
No distillation. Through recrystallization. Crystallization of course to start.
What solvent mix are you using to do that?
I recently found an easy way to get what seems to be fairly pure THCA. I dissolved some freezer made iso extract in a little iso, it was just an experiment so it was only about a gram in maybe 5-10 mls of iso. I put about an equal volume of baking soda in as the amount of extract. Then I gradually added deionized water with mixing until the soda was all dissolved, just enough to dissolve it. I filtered the solution and added more water, don't recall how much, just diluted it so it was mostly water, and then citric acid until a precipitate formed, and collected it in another filter, spraying pure water on at the end to wash the material of citric acid.
After drying the filter cake by laying the filter on a few sheets of paper towel, the precipitate could be removed from the paper in flakes by turning it upside down and plucking the flakes off with a knife tip, and then air dried. It's white chunks, which when heated fuse back into normal looking extract, pretty much exactly as it started out, same smell and everything, amber color though the flakes were white. Same as smoking normal extract but it's novel due to being white flakes before heated in a pipe. People can see you did some clean up work on it. I don't know how stable it is or anything. I didn't store it. I fused it back into a chunk of extract in the microwave.
Very interesting. The solid would likely be a lot more stable than the liquid, at least from my experience.
Curious what scale you did it on and what your yield was.
That is interesting. I honestly stay away from ISO, but in your instance you are washing it a few more times via h2o you can get all the iso out relatively easy. Id be curious to see your yield and a picture of what the product looked like. Ive heard of semi similar methods adjusting ph of water so that thca is soluble in it.
I was just doing the description based on memory. I may have diluted with a fair amount of water before the first filtering, rather than after, for instance. Didn't actually weigh for yields, but looked almost quantitative. I actually didn't expect it to work, so didn't put much detail into it. The thing here is that normally it's hard to get THCA to react with baking soda, because it's a rather weak base. I tried it a few times using camping fuel as solvent and it always failed. It also fails with no solvent at all, just water and soda, even if you heat it to liquefy the extract and mix it around well. Only a very slight amount reacts.
So I figured maybe if I dissolve the extract in iso and don't use immiscible solvents at all, and then add water little by little to dissolve the soda it might work better. Turned out I was right. It was as simple as that. Sodium carbonate might work even better, being more strongly basic than bicarbonate, or potassium carbonate, which is a lot more soluble. BTW, I doubt if vinegar would work, citric is the strongest organic carboxylic acid you can get. Fortunately, authorities would have trouble trying to restrict its sale, or baking soda.
They also show a method on youtube for making THCa crystal by running your stuff through a rosin press starting at very low temperatures and inching up.
I’ve seen this process. More people are using very high grade cold water hash filtered through 90-120 u, And then rosin press at temps low enough as to not hurt any mono terpenes through 90 u rosin filters. Purge shortly at low temps using a cold trap as to be sure they weren’t evaporating off any of the light end terps. Can’t reiterate how important the terpenes are here, there is no hydrocarbon assistance to help add viscousity to your extract, making it harder for THCa to move around freely. I’ve also seen extractors adding terpenes in with there rosin (some food grade, some marijuana terpenes, extractor dependent). Then go to jar tek method from there. Need to extract enough terpenes if you’re not adding any as these are the short chain hydrocarbons that make solventless hash a possibility. Some terpenes work better than others. Purity is a huge factor. Get your rosin up to 80-85% with heavy terpenes, and you’re in business.
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