Patent ID: 8092681

Claim:
A method for separating constituents of a feed in liquid solution of at least two constituents (A, B) of different partition coefficients such that they are carried along at unequal velocities respectively by a light solvent and by a heavier solvent, in a device comprising at least one liquid-liquid centrifugal chromatographic column (col) consisting of the interconnection in series of at least one set of separation cells (CE), characterized in that it comprises: injecting the feed at an intermediate point of said set of cells, and carrying out alternating cycles of two stages, with a first stage during a first time interval (t 1 ) wherein a lighter solvent is injected through a first end of the device and a first constituent is collected at a second end of the device, and a second stage during a second time interval (t 2 ) wherein a heavier solvent is injected through the second end of the device and a second constituent is collected at the first end.