The separation of materials of different chemical types by exploiting the relative chelating ability of different chemicals which preferentially dissolve in one of the two phases. In spent nuclear fuel reprocessing, liquid-liquid contact of two immiscible solvents (one aqueous, one organic) permits recovery and separation of uranium and plutonium in one phase and fission products in the other phase.
A process of extracting the essential oil from a raw material by exposing it to chemicals that strip away the non-soluble matter and leave the essential oil to behind. This method is used primarily for vegetable matter that is not very rich in aroma (bark, gums, resins) and animal matter (like ambergris, musk or castorium)
A method of separating oils from their base using a liquid in which the oil is soluble. The oil is then distilled and the solvent is evaporated leaving the oil.