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苯胺系无色油状液体,放置时很快变成褐色。它是一种重要的工业原料,可用来制备染料、胺醛树脂和作为制备酚醛树脂的碱性触媒。测定苯胺纯度的方法颇多,较重要的有溴量法和改良的重氮法。溴量法的结果偏高,重氮法须借助外指示剂来判断终点,而且直观性差,不易掌握,因此用电位滴定代替外指示剂判断滴定终点,取得良好效果。
Aniline is a colorless, oily liquid that turns brown quickly when placed. It is an important industrial raw material that can be used to make dyes, amine-formaldehyde resins and as basic catalysts for the preparation of phenolic resins. There are many ways to determine the purity of aniline, the more important are the amount of bromine method and modified diazo method. Bromine method results are high, diazepine method with the help of an external indicator to determine the end point, and intuitive poor, difficult to grasp, so the potential titration instead of the external indicator to determine the titration end point, and achieved good results.