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按照中学化学新教材,采用加热石蜡油的方法来制取含乙烯的烯烃,但在实际操作中,用酒精灯加热不仅长时间未发现气体产生,而且试管也易破裂,所以很多教师往往还是用传统的方法制取乙烯检验乙烯的化学性质:在圆底烧瓶中加入95%的乙醇和浓硫酸(体积比为1∶3)的混合液,加入碎瓷片,迅速加热烧瓶到170℃制得。但该方法存在着不足之处:一是在升温的过程中,稍不注意就会造成温度急剧上升,导致发生严重的炭化现象,造成实验后烧瓶难以
In accordance with the new chemistry textbook for middle schools, heating paraffin oil is used to prepare ethylene-containing olefins. However, in actual operation, heating with alcohol lamps has not only found no gas generation for a long time, but also the test tubes are easily broken, so many teachers often use them. The traditional method of preparing ethylene to test the chemical properties of ethylene: in a round-bottomed flask, a mixture of 95% ethanol and concentrated sulfuric acid (volume ratio 1:3) was added, and the broken porcelain was added, and the flask was quickly heated to 170°C. . However, this method has its disadvantages: First, in the process of heating, slight carelessness can cause a sharp rise in temperature, resulting in serious charring, causing the flask to be difficult after the experiment.