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Many organic mixtures may be separated by cooling crystallization. In simple terms, cooling crystallization means that a mixture of organic chemicals is partially crystallized by reduction in temperature, without removal of any of the components by evaporation. Crystallization is a one-way process; the heat is removed, crystals are formed, and the mixture of solids and liquids are then separated.


Many crystallizations take place at near ambient temperature so there is little heat up or cool down required to get the right conditions for the separation to start. In the great majority of crystallizations, the crystals which form are 100% pure material, as opposed to something only slightly richer than the feed material as in distillation. With crystallization, it is not necessary to repeatedly melt and refreeze to obtain high purity. Any minor impurities present following cooling crystallization can be removed easily.

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