FIELD: separation of mixtures. SUBSTANCE: arranged in the known sandwich chamber for separation of substances in microthin sorption layer are two chromatographic plates coated with sorbent layers identical in composition and structure and located parallel to each other. Installed between plates over their periphery from three sides is sealing gasket. Plates are placed in pan for liquid phase. Sorption layer of auxiliary plate has thickness ensuring ratio between volume of vapor-phase part of chamber and volume of sorption layer of auxiliary plate equalling from 30 to 5. EFFECT: higher efficiency. 2 dwg
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