PSI and product difference BHO 70/30

Hey Yall semi new to the game we just started extracting a few weeks ago and since then have revised SOP a number of times. Yesterday after my initial soak i ran some solvent through then hit a second soak but this time turned on my pump to build some pressure and soaked at 100psi vs the 50/60 I normally have with the pump off. I seem to be getting better yields with the increased pressure but normally my final product is a nice terp sugar almost like kinetic sand with a sauce but after adding the pressure to the soak yesterday what i got was more like a cross between crumble and sugar. still smells amazing and the color is about the same orange hue it always is we run dry ice through an injection coil and fresh frozen material in frozen columns so I dont think we picked up any extra waxes or anything. What do yall think is adding pressure to a soak helping or is it causing me to pick up undesirables? Just trying new things to see what works right now looking for some advice to make sure im on the right track. Ignore the color I was under HPS lights using a filter in a darker corner so it looks dark but its pure gold.

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prove it to yourself.
winterize some.

and/or get it tested for potency.

are you using n-butane?

I just accidentally extracted some material with room temp butane at about 120 psi for 24 hours and sent the extract thru bentonite.

I certainly did pick up all the waxes available and all the carotenoids… lol.


Yea n butane the product goes off for testing next week.

First post and it was all just a processing error i feel dumb now. Left it on half vac overnight so all the trapped bubbles changed the finish. After pulling full vac on it now its starting to look like it should.

Can someone explain that phase diagram a bit?
The way im reading it since im keeping the solvent sub zero increasing the pressure shouldn’t cause an issue.

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As far as the phase diagram above, it really just shows that you are squarely in the liquid region. If you are keeping the system cold, you will stay in the liquid phase at most any pressure you are working at. The ‘compressible liquid’ area is up over 500 PSI, so not an issue with this extraction. The diagram does not give any real info as to how effective the extraction will be.

Generally, you can assume that an extraction at a higher pressure (compared with an extraction of all the same parameters) will perform a more ‘complete’ extraction. The effect would be similar to performing an extraction at an elevated temperature, although I imagine pressure will have much less of an effect on the end product compared with changing the temperature. Pressure is a less sensitive variable with respect to extraction. There are 2 reasons I can think of off hand as to why the extraction would be more ‘complete’.

First (and only reason applicable here) is simply space-filling. Imagine your material column filled with gas and material. If you were to dial up the pressure at this point, the butane will get ‘squeezed’ into the material with more force, more thoroughly soaking it. The extra pressure forces the gas anywhere it can move into, and squeezing a bit more into the material is the only place the gas can really go.

The second reason is due to fluctuations in the actual molecular structure of the gas. As pressure is dialed up, the structure of butane/propane can get distorted, flopping about through different conformations which can effectively increase the polarity of the molecule for a short time. I have not run numbers on this, but I imagine this would not be a major effect until you get near 1000 PSI (or maybe ~500 PSI, aka the compressible liquid area of the phase diagram). As a interesting note, this distortion is a key principle in sub and supercritical CO2 extraction, one of the reasons extraction pressures are soooo high in CO2 extraction.

BUT, this is not really beneficial for what most of us operators are trying to do. The vast majority of stuff we want to extract is on the outer surface of the material (in trichromes), so increasing pressure and getting into the middle of the plant material and into the actual cells of the plant is really just extracting unwanted compounds.

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How do we rig up a supercritical butane or propane extraction? I’m assuming we use a co2 extractor with an inert gas sweep to remove oxygen💣

Anyone ever done this?

I think some people have done supercritical propane on here. I remember @Roguelab was toying with the idea? Although I think both of us constantly think about weird shit we wanna do… Did you ever get that ethane extractor going? :sweat_smile::sweat_smile:

There’s certainly nothing more fun than finding something flammable, then putting even more of it in a tube, then pressurizing it into instability.


and then making drugs!!!