ok, i'm picturing this liquid do a great job of separating the bad from the good, then.... the liquid evaporates, leaving the bad still on the good.
obviously, i have an incomplete picture, because liquid CO2 is being used in everyday practice as a dry-cleaning fluid. EG,
You need several atmospheres of pressure to get above the triple point of CO2 - somewhere between 5 and 6 if memory serves.
You remove the good out of solvent whilst the bad is suspended/dissolved. You are then left with a clean good and solvent plus bad which you either discard or clean up for reuse.
What's wrong with butane - particularly in cold weather? At least you don't have to wait ages for it all to evaporate away.
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