Hydro-distillation: nf Hydro-distillation (or steam distillation): this is one of the oldest processes for extracting or separating certain organic substances, brought by the Arabs in the XNUMXth century . This operation is carried out in a still. The method is based on the existence of an azeotrope (See this word) with a boiling temperature lower than the boiling points of the two pure compounds taken separately.
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