Can I have more details? First, we take an excess of pentane. During the reaction, the excess must be evaporated. The hot oil then crystallizes into a solid. Next, we take the minimum amount of hot alcohol and dissolve the solid when heated. If you take a lot, then the powder will not fall out, you need to evaporate it additionally. After slowly cool to room temperature, once it has cooled down, you can put it in the freezer. Further, the precipitated solid must be filtered, it can be washed with ice alcohol again.