实验室制备溴乙烷引发的思考

Meditation of the Preparation of Bromoethane in Laboratory

通过有机化学教学实验溴乙烷的制备引发的溴乙烷产量低及颜色微黄等问题,诱导学生思考与解决问题,培养其查阅文献资料,改进实验方案,独立操作有机实验的能力。结果表明,过量的乙醇与适当过量的浓硫酸有利于反应的进行。当投料量固定10 m L 95%乙醇、15.430 g无水溴化钠时,19 m L浓硫酸、12~14 m L水或9 m L水、13~16 m L浓硫酸均可得到高产量的无色溴乙烷。

The low production and the yellowish color of bromoethane produced by the organic chemistryteaching experiment ＂ preparation of bromoethane＂ induce students to think and solve the problems,which train their ability such as consulting the literature,improving the experiment plan,and independently operating organic experiment. The results showed that excessive ethanol and suitable excessive concentrated sulfuric acid were beneficial to the reaction. When the dosage was fixed at 10 m L 95%ethanol and 15. 430 g anhydrous sodium bromide,either 19 m L concentrated sulfuric acid and 12 ～ 14 m L water or 9 m L water and 13 ～ 16 m L concentrated sulfuric acid could obtain high yield colorless bromoethane.