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一、原料分析 一、苯酚纯度的测定 1.反应原理:通过测定凝固点,便测得苯酚的纯度40.40℃为一级品,39,70℃为二级 2.仪器:带把蒸发器 150毫升1个; 茹可夫瓶 1个; 温度计1/10 37℃-50℃1支。 3.测定方法:把苯酚放在蒸发器于60—70℃熔融后,倒入茹可夫瓶内,盖上胶皮塞,皮塞中间插有温度计,用此温度计,搅拌瓶内的液体苯酚,注意苯酚下降温度。苯酚凝固时瓶内出现白色针状结晶,此时温度
First, the raw material analysis First, the determination of the purity of phenol 1 reaction principle: By measuring the freezing point, we can measure the purity of phenol 40.40 ℃ for the first grade, 39,70 ℃ for the second grade 2. Instrument: with the evaporator 150 ml 1 A; Ru Kov bottle 1; thermometer 1/10 37 ℃ -50 ℃ 1. 3. Determination: The phenol on the evaporator at 60-70 ℃ after melting, pour Ru Jiefu bottle, covered with rubber plug, plum plug inserted between the middle of the thermometer, with this thermometer, stirring the bottle of liquid phenol, Pay attention to the phenol drop temperature. Phenolic white bottle-shaped crystals appear in the bottle when the temperature