seems like folks throwing 25lb of 70:30 at a 6x48 column are leaving cannabinoids on the table (nope; no search query, but the data is here).
but evaporating 3x as much solvent to get yields up takes rethinking the recovery process or 3x as long…and most don’t take the trouble.
so how about using the same strategy the CO2 and Ethanol (at least them what grok) folks do and send the same solvent over the biomass repeatedly?
what if we grabbed (say) @indofab’s recirculated CRC and swapped biomass in for the magic dirt? why do a hr soak to get your yield up when a 10min recirculation does a better job?
id imagine at some point your recirculated solvent is gonna be warmer than the initial run…not to mention you probably gonna have to heat up the actual oil several times to recirculate.
5:1 lets you us a 125lb (fuckers call it 250lb) tank to get the job done, but leaves goods behind. as I said, the data is here. folks are running that way.
I would say run the secondary solvent many times. Run once normal then recover. Then take another amount of solvent and re-extract the material. Then set aside that material/solvent mixture to do the same thing with it on the next batch