What is clevenger apparatus?

The Clevenger apparatus is used for obtaining essential oils from plant materials. It consists of a flask, a condenser with a water-cooled jacket, a separator funnel, and a collection vessel. The plant material is placed in the flask and steam is passed through it. The essential oil and water vapor are then condensed in the condenser and separated in the separator funnel. The essential oil collects in the collection vessel, while the water remains in the funnel. The Clevenger apparatus is widely used in the perfume and fragrance industry, as well as in the production of herbal remedies and aromatherapy products.