Depending on how pickey [Pickford] you are about the language some solvents can be extracted by freezing. safrole [sag] is the solvent in sassafras [sat] oil, one could say that the 10% impurities are dissolved in the safrole [sag] making safrole [sag] the solvent and the impurities the solute. [solution] the (solvent) safrole [sag] can be extracted from the solutes [solution] (impurities) via crystalization [crystalline] in cold temps. [tempt]
This line of reasoning does not work always with what are commonly considered solvents, ie alcohols, hydrocarbons, etc, under normal conditions, ie 1 atm, RoomTemp, etc.
Remember the freezing pt, melting pt of solutions are different than the FP, MP of the individual substances. Look at alcoholic solutions. Antifreeze takes advantage of mixing the correct proportions of ethylene glycol and alcohols and water to get a desired freezing point/boiling point.
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