Essential oils are very useful. They give off pleasant fragrances that can uplift any room. They can also be used for medical purposes.
It can be complex when making essential oils. The oil is extracted from all sorts of areas on the plant. It can take up to a hundred pounds of the plant to make one ounce of the oil because the plant does not contain very much oil. Essential oils are heavily concentrated.
There are multiple ways to extract the oil when making essential oils. Some methods are better than others for specific plants. Usually the harder it is to extract the oil from the plant, the more expensive the oil will be.
Steam distillation uses high-pressure steam over the plant to extract the oil, which travels into a chamber, and then settles out into a container. The oil is then skimmed of the top while the water left over can be used for fragrances or toners. Steam distillation is the most commonly used method for making essential oils.
Now when the flower or plant is too fragile, then solvent or steam diffusion extraction is used. Steam diffusion extraction is similar to steam distillation, but the steam is at atmospheric pressure instead of high pressure. Solvent extraction uses a solvent to extract the oil and then the solvent is removed through low-pressure distillation. A waxy solid is left over which is oils, waxes, and pigments and all of them are then separated out and used.
There are some flowers or plants that have very little essential oil. For these plants the enfleurage method is used. Enfleurage saturates flowers in odorless vegetable oil to extract the oil. Alcohol then removes the essential oil from the vegetable oil and then evaporates over time.
The fruit of some plants make the citrus essential oil. Cold pressing extracts the oil by squeezing the juice out. Using centrifuge then separates the juice and oil.
Carbon dioxide method releases this gas into a container with the plant until the gas turns into a liquid and extracts the oil. Once the liquid is passed into another chamber, the gas evaporates. All that is left is the essential oil with no residues.
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