Activated carbon is made from charcoal, sugar charcoal, bone charcoal, and the like. Often contains a small amount of phosphoric acid, calcium and zinc elements. According to different decolorization targets, different types of activated carbon are selected. The use of activated carbon: crude organic compounds often contain color impurities, in the recrystallization, impurities can be dissolved in the boiling solvent, but when the crystals precipitated by cooling, some impurities will be crystal adsorption, the product color.
Industrial decolourizing activated carbon can be often heard. The decolorization effect of activated carbon in aqueous solution is better, and it can also be used in any organic solvent, but it is less effective in non-polar solvents such as hydrocarbons. In addition to decoloring with activated carbon, diatomaceous earth, etc., or column chromatography may also be used to remove impurities. When using activated charcoal, the amount must be adequate and too much excess must be avoided because it can also adsorb a portion of the purified material. Therefore, the amount of activated carbon should be determined depending on the amount of impurities, generally 1-5% of the dry crude product quality. If these amounts of activated carbon cannot completely decolor the solution, the above operation can be repeated with 1-5% of activated carbon. After the amount of activated carbon is selected, it is best to decolorize once to reduce the loss of operation. The quality of the filter paper used in the filtration should be tight, so as to avoid the activated carbon through the filter paper into the solution. The filtration method can be hot or hot filtration.
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