Environmentally benign extraction/fractionation of liquid crystals from waste LCD devices

摘要

A method for extracting a liquid crystal compound or group of liquid crystal compounds from a mixture containing it, said method comprising contacting the mixture with a solvent comprising carbon dioxide in liquid or supercritical form under conditions at which a liquid crystal compound or group or similar compounds is extracted into the solvent, separating the thus formed solution from the mixture and recovering the liquid crystal compound therefrom.