Apparatus for the extraction of constituents by a supercritical fluid or pressurized liquid

PCT No. PCT/FR86/00295 Sec. 371 Date Apr. 2, 1987 Sec. 102(e) Date Apr. 2, 1987 PCT Filed Sep. 2, 1986 PCT Pub. No. WO87/01299 PCT Pub. Date Mar. 12, 1987.An apparatus for the extraction of constituents present in a substance by means of an extraction fluid constituted by a supercritical fluid or a pressurized liquid. According to this apparatus, in an exterior (3) contacting takes place between the substance and the extraction fluid in order to dissolve the constituents in fluid. The fluid leaving the extractor is then treated to separate the extracted constituents. The fluid is expanded at a pressure p1. Firstly, the less volatile constituents are separated in a liquid-gas separator (41), the separated gas is then liquefied in gas separator-liquefier (13) and the thus liquefied gas is rectified in column (19) to concentrate the extracted constituents in the liquid phase. The extraction fluid can be carbon dioxide gas.