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工业上制乙烯是由石油高温裂解而制得,在实验室中通常用乙醇被浓硫酸脱水而制得。但是笔者在教学过程中,根据《化学》(人民教育出版社2003年6月第一版)教材中乙烯制备的方法制取乙烯时出现了一些问题。即在加热时,乙醇和浓硫酸混合溶液的温度很难上升到170℃,无法成功制备出足量的乙烯。那么是什么原因导致实验失败,无法制出足量的乙烯呢?笔者进行
Ethylene is produced by industrial pyrolysis of oil at high temperatures in the laboratory is usually dehydrated ethanol and concentrated sulfuric acid obtained. However, during the course of teaching, the author came up with some problems when making ethylene according to the ethylene preparation method in the textbook of Chemistry (People’s Education Press, June 2003). That is, when heated, the temperature of the mixed solution of ethanol and concentrated sulfuric acid is difficult to rise to 170 ° C, so that a sufficient amount of ethylene can not be successfully prepared. So what led to the failure of the experiment, can not make enough ethylene it? Author