1、 掌握一图(原子结构示意图)、五式(分子式、结构式、结构简式、电子式、简式)、六方程(化学方程式、电离方程式、水解方程式、离子方程式、电较方程式、热化学方程式)的正确书写。 2、简式相同的有机物：① CH:C2H2和C6H6② CH2:烯烃和环烷烃 ③ CH2O:甲醛 ...

Extractive distillation is widely used in industries such as anhydrous ethanol manufacturing. History shows several problems related to separation agents, such as chloroform, cyclohexane, ethyl ether, ...