An organic solvent and water are not miscible at room temperature, but they can form an azeotrope with a lower density than water. Such a solvent is usually toluene. When the water trap (the upper end is equipped with a condenser) is filled with solvent Add a part or not, if not, add more solvent to the water separator in the reaction system), the solvent and water are layered in the water separator, the water accumulates in the lower part of the water separator, and the solvent returns to the reaction System. In fact, there are two core points: azeotrope with water is immiscible, and the density is lower than that of water.
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