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医疗用的95%酒精,一般都是用大铁桶装运和贮藏的。由于酒精中含有5%的水,容易使铁氧化生锈。酒精在铁桶里存放的时间越长,含铁锈就越多,使本来无色澄明的酒精呈红棕色。这种含有铁锈的酒精须经净化后才能使用。目前净化酒精中铁锈的方法很多,可以用活性炭吸附过滤,自然沉淀;也有用氯化钠净化的。但是这些方法有的成本高,有的净化不完全,有的费时间,都不很理想。在实践中,经过反复试验,我们用碳酸氢钠净化酒精中的铁锈效果比较好。方法和原理:先将所需量的碳酸氢钠溶于适量水中(以能溶化为度),再倒入含有铁锈的酒精中去,
95% alcohol for medical use is generally shipped and stored in big drums. As alcohol contains 5% water, iron oxide easily rust. The longer alcohol remains in the drum, the more rust is contained, rendering the red, colorless, colorless, colorless alcohol. This rust-containing alcohol must be purified before use. At present, there are many ways to purify the rust in alcohol, which can be adsorbed and filtered by activated carbon and precipitated naturally. It is also useful for purification by sodium chloride. However, some of these methods are expensive, some are not completely purified, and some are time consuming, which are not very satisfactory. In practice, after repeated experiments, we use sodium bicarbonate to purify the rust in alcohol is better. Methods and principles: The first amount of sodium bicarbonate dissolved in water (in order to melt into degrees), and then into the rust containing alcohol to go,