yeah, but the name of the thread is “decarb under pressure to retain terps”…
so, in an effort to answer the question at hand, the answer is decarb under pressure.
But yeah, ideally, the terps are all spun off before decarb.
This is a good idea and you can do it with the round bottom flask of the rotoevap too. Understandably, it will be hard to account for the transfer loss, however it shouldn’t be hard to approximate with reasonable variance that final value putting into consideration the weight of the vessel after transferring.
You could also obtain some good data comparing the end product in the vessel with the end product in the flask. This would determine what percent of CO2 stays dissolved in the oil.
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@moronnabis & @Photon_noir have both expressed that as a concern
@moronnabis may have referred to
One, two three, The dance of the Tao and the ten thousand things ….
In this very thread.
@Photon_noir’s warning is pretty close to the top iirc
It’s a legitimate concern…
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Which one becomes radioactive or explosive or toxic or whatever 
after it oxidizes or hits a boiling point? Lmao let alone all the other deadly possibilities I missed @cyclopath
Sure let’s add unknown metals and heat them up from sources that breathe cancer for a living. Surely they’ve chosen the healthy metals for vaporizing… For us… Lol
How bad is car exhaust or living in societies with smog as air?..
Shits fucked
Everything we inhale is imported and untested. So don’t act like anyone actually gives a flying …
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What about citric acid decarb?
I don’t recall what I said, @cyclopath , but you’re probably right. I should also include a caveat about any “warning” I may have provided on this topic, though. Here goes…
While it is probable that terpenes—especially in the presence of air—will oxidize, isomerize and otherwise (rhymey!) react to form weird shit when exposed to typical cannabinoid decarboxylation temperatures & times, and although we may want to avoid this for the sake of original flavor/aroma retention, these chemical byproducts at nominal dosages are probably NOT going to hurt anyone; acutely nor chronically. I honestly believe pyrolysis and smoke inhalation creates all of these chemicals and even much nastier ones than decarb ever could, and yet pot smokers persist, healthy, hale and hearty as they were before burning down the whole joint, even despite hacking up a lung or three in the process!
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What about it, @zak ? If you decarb citric acid completely, you are left with isopropanol… probably as a gas… assuming it doesn’t combust during the decarboxylation process! Why do you ask?
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I believe he’s referring to using it as a catalyst to increase the rate of decarboxylation.
Oh… Does that happen, @CuriousChemist22 ?
It has been my experience that alkaline, " earth, and some transition metal oxides catalyze decarboxylation of cannabinoid acids (and cleave carbonyl groups in general), or that exposure of the acids to alkalinity in solution (also over alkaline-potential solid phase medium) can promote lower temperature, higher rate decarboxylations.
These are all diametrically opposed to using an acid—especially another carboxylic acid—as a decarboxylation catalyst, so I don’t imagine it would work for that purpose @zak …assuming that was, indeed, your intended inquiry!
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