With these particular runs (the direct HTE filtration), the THCA levels were already too low from the start to crash.
I have crashed THCA using dewax membranes on pentane solution.
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Can you scale it down to process like 10L of HTE?
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Yeah, that’s pretty much the size I ran it on in the trials in that very picture.
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shutup and take my money
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Membrane magician,
Would it not be possible to take the smallest alkane resistant spiral membrane and connect it to a high pressure rated vessel and pressurize this with N2 as a small batch unit ?
I’ve seen flat sheet setups that have been run like that, it would be ridiculously inefficient with a spiral setup but it could be done.
I’d probably try it as a dead end system, and do a periodic flush.
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Who has the smallest spiral wound alkane proof membranes ?
And which dalton size would be recomended ?
You’d almost certainly be looking at an 1812 size module. They tend to be fairly commonly available.
I’m not sure which would be best for your application, that would be something to discuss with Zev. I’m off splashing around in water world and not aware of the state of the art for alkane stuff anymore. But I do know that alkane membranes are few and far between and super fuckin expensive. Performance tends to be pretty meh with them as well.
Prepare to do diafiltration until you say “fuck it, it’s good enough”
Yeah, you can do that. Just be aware that the results running it in that manner will not be equivalent to what you’d get running it in crossflow. It will deviate in unexpected ways. It will also foul quickly.
I have run chipped HDPE against aqueous high pH solutions of cannabinoic acids and neutrals…you would not believe the non linear surface adsorption. So I think the specific chemistry of the back bone polymer is so important let alone charge and pore size variations. With respect to your three tube demonstration, are you suggesting the selectivity is a function of relative pore size , solute with solvation shell passing through pore, or some sort of interaction with a solute/solvent adsorbed layer onto polymer back ground that modulates nominal pore size….
I mean the phenomenology of the “three tubes” looks great…but I can not imagine what is going on? Primarily the nominal pore sizes are used in size exclusion phenomena, but it would seem that HTE with solvent , terps and cannabinoids in solution are at least 1-2 orders of magnitude smaller than the nominal pores sizes? So something is “clearly” going on to achieve such results.
I am guessing the dark oxidized material is very high MW and is just excluded?
You didn’t clearly mention the effective pore sizes at play…but I am not surprised at your comment concerning “quickly fouling”. Are these ethanol/water mixtures?
Do you have any intuitive notions of how all this comes about.
(Guessing you mean HTE as left over from THCA crash and spin off?)
Thanx
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