Method and system for extracting a solute from a fluid using dense gas and a porous membrane

(57) The method and equipment (10) which extract a solute from summary fluid or dark gas include a dark gas supply source (12) and the gas supply line which supplies dark gas to a pressure equilibrium chamber (122) and the module (16) which accommodated the bunch of the porous macaroni fiber, and which can be pressurized. This equipment (10) includes a fluid source of supply (14) and the fluid supply line (40) for supplying fluid to a chamber (122) and a module (16) again. Including a floating diaphragm (26), a chamber (122) balances the pressure of fluid and dark gas substantially, and makes the work from which it is made for the pressure of the both sides of the film in a module (16) to essentially become the same. At least 1 side of fluid and dark gas contains the solute which should be extracted, and another side acts as an extraction medium. Extraction of a solute is driven according to the concentration gradient of the solute which crosses a film.