Just inert agitation
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I actually donāt use Nitrogen to push. I use co2. Yeah I get the refills are only like $10 more for a nitrogen bottle but they want like $300 on a deposit, and I canāt notice any insane difference from pushing with co2 instead of nitrogen. I suppose itās possible itās adding moisture or slight oxidization but if it is itās not on an extremely noticable level.
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I think itās more safety matter w co2 and pressure swings w temps . But I donāt know for sure
It doesnt necessarily need to have a chemical reaction to cause adsorption. Pressure swing adsorption for purification of nitrogen is an example of this. Nitrogen can most certainly take adsorption sites.
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Cool, could CO2 possibly clear them?
CO2 has potential to be adsorbed as well, but what do you mean by clear them?
Like use CO2 to clean the pores of your media?
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Depending on how cold you run your system the c02 can remain liquid, essentially turning your rig into a C02 bomb, nitrogen is the safest way to go if your not using a pump for push pull.
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I knew it
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So you think a gas we have no chance of compressing to a phase change is the only way to go?
But whether nitrogen WILL take up adsorption sites is based entirely upon the conditions inside the reactor such as pressure (or the lack thereof) and temperature as well as the relative affinities of your solvent and cannabinoids with the media versus nitrogen.
If I remember correctly its very dangerous to use co2 in that way because of how quickly it can expand. Youād better have a system with all 1.5" triclamp connections if you plan on doing something like that 
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Propane agitation fam
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Please expand
ā¦ Du du tssss
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Carbonation stone w propane. BOOM. DU DU TSSS
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How come I got a D in chemistry but Iām such a freaking genius? Lol
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Iām pretty sure itās all about temperature, if your trying to percolate extract and solvent with adsorbents I think you want to let the mixture to warm up because it increases the efficacy of the adsorbent action. I wouldnāt be worried about using co2 for agitation except that Iām not sure how you would vent excess pressure without losing hydrocarbon gasses as well if your warming the mixture up. 
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If you can keep it above 400psi your co2 is gonna stay liquid. Then itās an absurdly non polar solvent. Which might be super fun for LLE or adsorbents.
You could just pressurize butane or propane at a lower psi to a similar effect.
Co2 in gaseous form can still pull some terps, and if youāre dealing with an alcohol itās also going to dissolve as carbonic acid. So thatās also something to keep in mind.
Because they didnāt explain it properly to excite you and want to learn it
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This paper would suggest the only inert gas not adsorbed by bentonite and montromilinite would actually be co2. Which could be used safely in its gas form by only using the crv at temperature/pressure ranges that maintain its gaseous phase, which weād want higher temperatures for increased efficiency anyway. Fill the crv with maybe 5:1 heptane to crude and 1:1 crude to media, agitate with recycled co2 gas on a loop and/or rotational agitation simultaneously. Still definitely keep the co2 out of the material column, but it would come in handy in the crv where itād be better suited. Nitro assist for column clearing, co2 assist for crv agitation and clearing. 
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We had this issue when we tryed a mix of n2 and co2, pressure built in the burped tanks once the chiller was turned off.
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