Innovations of Comprehensive Steam Distillation Experiment in Teaching

Abstract

Abstract: Steam extraction,sublimation,and distillation are the basic knowledge of organic chemistry experiments that chemistry undergraduate students should have.Based on their principles and the improvement of steam distillation device,the camphor oil can be extracted by U-shaped tube with the dry leaves of Cinnamomum camphora(L.) Presl as raw material.The essential oil mixed in the camphor oil is adsorbed by filter paper and then recovered by ordinary distillation,correspondingly,and the remaining crude camphor is purified by vacuum sublimation to obtain camphor.Finally,the teaching of comprehensive experiment using natural plants as material is achieved.During the experiment,the extraction and stratification of camphor oil and the formation of camphor crystals can be directly observed.The obvious improvement of the experiment is easily-installed device and moderate time.Moreover,the operation in experiment is safe,interesting,comprehensive and closely connected with life.Through the technical operation and understanding of the comprehensive experiment,students are trained to apply theoretical knowledge to creatively design experiments.Therefore,it is suitable for the undergraduate teaching of organic chemistry experiment.

Key words: steam reflux, sublimation, distillation, camphor oil, camphor, essential oil

CLC Number:

G644.5

LIAO Fumin, LIU Mengjun, YANG Shuangqin, LIU Pinhua. Innovations of Comprehensive Steam Distillation Experiment in Teaching[J]. Journal of Qujing Normal University, 2021, 40(6): 92-97.

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