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FIELD : technological processes. SUBSTANCE : extraction unit "liquid-liquid" includes extraction/separation vessel, an aqueous phase in the form of bubbles is fitted from the upper inlet in one side wall, and an organic phase in the form of bubbles is fitted from the lower inlet in the said side wall. Organic phase which moves upwards is contacted with aqueous phas which moves downwards. After contacting, organic phase is discharged through the upper outletmade in the opposed side wall, and aqueous phase is discharged through the lower outlet maid in the said opposite side wall. EFFECT : reduced device footprint, reduced liquid used and resulting reduced cost. 7 cl, 6 dwg, 2 ex