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How
are Essential Oils produced?
Essential oils come from diverse parts of aromatic plants:
- Roots & rhizomes as in the case of vetiver and ginger.
- Fruits as in the case of juniper
- Buds as in the case of Cloves
- Leaves as in the case of Rosemary and Thyme
- Petals such as Rose and Neroli
- Flowing heads such as Roman Chamomile & German ¡Chamomile
etc.
- Rind of citrus fruits such as Bergamot and Lemon
- Resin from trunks of plants like Myrrh and Frankincense
Enfleurage
This is a method of non-volatile or fixed
solvent extraction at normal temperatures based on absorption
of a flower fragrance by purified and odorless solid fat. This
fat, in ancient times, used to be a closely guarded secret by
the distiller.
Expression
Expressed extraction, the most common
extraction method, is used to extract the citrus oils from the
peels of Lemon, Orange, Bergamot, Grapefruit, Mandarin, Lime &
other citrus fruits.
The process of Distillation
This is simple distillation of plants
and liquids at atmospheric pressure. The plant material and/or
liquids to be distilled are placed in a distillation vessel. This
vessel is fitted with a tube at or near its upper section to enable
the vapor to fall into a downward slope or in a vertical water-cooled
condenser. To enable this to happen the liquid has to be heated
over boiling. This vapor from boiling then passes into the cooling
condenser where it condenses into a liquid. The condensed liquid
is then collected in a receiver flask. The remaining distillation
water, once it is separated from an essential oil, nearly always
carries the fragrance of the oil, giving us evidence, to some
extent, that some essential oil molecules are water soluble.
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