FIELD: methods of separating liquid supercritical or gaseous mixture. SUBSTANCE: method involves placing the mixture into closed circuit of column fragments and carried out in fluidized bed allowing correction of distortions in composition of extract or raffinate. Distortions occur to clearance volumes which are formed by at least one pump or one recirculating compressor. Volume of fragment is reduced by necessary value directly in upper point of clearance volume when the clearance volume is found in lower point of this fragment and in upper point of flows coming from the fragment or volume of fragment is reduced by necessary value directly in lower point of clearance volume when clearance volume is in lower point of flows coming into the fragment, and in upper point of this fragment. The method is used in separation of isomers of aromatic hydrocarbons containing eight atoms of carbon and allows elimination of distortion in product composition. EFFECT: higher efficiency. 9 cl, 4 dwg
