Top topic this week
Questions asked by users might not always be phrased in the clearest way.
Isobutanol has a melting point of -108 °C. At -18 °C, it would be a liquid. Therefore, it would not crystallize out of a solution at that temperature. To crystallize isobutanol, you would need to cool the solution below its melting point. The choice of solvent would depend on the desired application and the solubility of isobutanol in that solvent at low temperatures.