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Distillation is a thermodynamic separation process. It uses the different boiling points of the components in the mixed liquid or liquid-solid system to evaporate the low-boiling components, and then condense to separate the entire components. There are two types of unit operations: evaporation and condensation. Union of unit operations. Compared with other separation methods, such as extraction, filtration and crystallization, its advantage is that it does not need to use other solvents other than system components, so as to ensure that no new impurities are introduced.

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