Abstract: An apparatus for extracting, concentrating, and separating biochemical compounds from plant or animal biological substances. It has a heating vessel for the substance to be treated, and is connected at its lower part to an evaporation circuit. The evaporation circuit is connected to the upper part of the heating vessel and, by a valve, to the bottom of a distillation column. A condenser is connected to a vacuum source and, by a valve to the top of the distillation column. A decanter is connected by a valve to the condenser and then successively to a first tank for recovering essential oil, a second tank for recovering aromatic water, and to the vacuum source. A dual discharge circuit has its first circuit connected by two valves to a third tank for receiving light aromatic compounds and to a fourth tank for receiving regenerated solvents.