Essential oil is a concentrated and hydrophobic liquid that contains volatile natural aroma compounds. Aromatherapy oils are extracted from several parts of the plant including seeds and rinds, roots, petals and leaves. Essential solutions are mostly extracted by distillation. Most aromatic liquids are extracted by vapor. With growing popularity and needs of aromatherapy treatment, present market has satisfying availability of Aromatherapy Books Online. Knowledge about different methods of oil extractions from the books will certainly help users become aware of their benefits in daily lives.
- Distillation is basically part of a broader chemical process, and hence it is considered as a unit operation. Steam distillation is the most common process of producing essential oil involving the steam flow into a chamber containing the raw plant material. The steam causes small sacs with aromatic oil content to burst. Steam distillation applies an outside steam source to pipe the steam into the distilling unit, sometimes at high pressure. The steam releases through the aromatic substances, and passes into the condenser.
- Enfleurage is another extraction method by which Jasmine, Rose and various other flower essences that are more difficult and delicate to obtain are extracted. Petals or flowers are crushed within wooden framed glass trays layered with animal fat till the fat is concentrated with their aroma.
- Cold pressing is another process. This process is actually employed for citrus oils. Mechanical pressure is applied for forcing the oils out. The downside of applying this extraction process is that the cold pressed solutions spoil faster than those extracted oils using other methods. Cold pressed essential oils are also photo-toxic.
Different processes include solvent extraction or expression. These solutions are used in cosmetics and perfumes, for flavoring drink and food, for scenting incense and household cleaning products. There are various means in which aromatherapy oils are extracted. The vast majority of pure essential oils are produced by the process of distillation. By using this method chemical substances can be separated based on differences in their volatility in a heating liquid mixture. Quality Aromatherapy Books Online broadly describe various important aspects related to blending and extraction of these oils.