二苯并—18—冠—6(简写作 DB18C6)是一种常用冠醚,市售的粗产品往往含有较多的杂质,使用前必须进行提纯,其提纯方法多采用苯重结晶法,这种方法有下列缺点:一是苯的发挥性大,热过滤时很容易阻塞漏斗;二是室温下 DBl8C6在苯中溶解度较大(～7克/升),因此用苯重结晶时 DB18C6的损失量较大;三是苯不能很好地将 DB18C6中所含的 Dibenzo-18-crown-6 (abbreviated as DB18C6) is a common crown ether. Commercially available crude products often contain more impurities and must be purified before use. The purification method uses benzene recrystallization method The method has the following disadvantages: First, benzene play a large, easy to obstruct the funnel when the filter is hot; Second, DB18C6 is more soluble in benzene at room temperature (~ 7g / L), so the loss of DB18C6 Third, benzene can not be well contained in DB18C6