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Steam evaporation method——Extraction of essential oils
Jan 31, 2019


     The steaming method is one of the earliest methods of refining. With the changes of the times, the instruments used have been significantly improved, but the principle is basically the same: the aromatic plants are placed in a distillation vessel, and high-temperature steam is introduced into them ( Or put the spices and water together to boil), at this time, the essential oil containing the aromatic components in the plant will diffuse into the water vapor to form an azeotrope of oil and water; thereafter, the azeotrope is cooled, because the oil is insoluble The water, which separates from the water, forms the essential oil we need. Distillation is very convenient and does not require the use of chemical solvents, so current applications are still common. Roses, lavender, rosemary, geranium, etc. are mostly used in this way.