Liquid-liquid extraction device

A multi-tower liquid-liquid extraction apparatus comprising a plurality of extraction towers, n (n being an integer of 2 or more) extraction towers being arranged in parallel;

• each extraction tower comprising a heavy liquid supply portion on the top side of the extraction tower and a heavy liquid discharge portion on the bottom side of the extraction tower, and, comprising a light liquid supply portion on the bottom side of the extraction tower and a light liquid discharge portion on the top side of the extraction tower;
• (a) the heavy liquid discharge portion of the first extraction tower of the n extraction towers being connected through first piping to the heavy liquid supply portion of the second extraction tower, the heavy liquid discharge portion of the second extraction tower being connected through second piping to the heavy liquid supply portion of the third extraction tower, the heavy liquid discharge portion of the (n−1)th extraction tower being connected through heavy liquid piping to the heavy liquid supply portion of the nth extraction tower, and in this way, heavy liquid channels of the n extraction towers being connected in series, or;
• (b) the light liquid discharge portion of the nth extraction tower of the n extraction towers being connected to the light liquid supply portion of the (n−1)th extraction tower through third piping, the light liquid discharge portion of the (n−1)th extraction tower being connected to the light liquid supply portion of the (n−2)th extraction tower through fourth piping, the light liquid discharge portion of the second extraction tower being connected to the light liquid supply portion of the first extraction tower through light liquid piping, and in this way light liquid channels of the n extraction towers being connected in series, and;
• at least two of these n respective extraction towers being connected to respective diaphragm chambers by respective piping, said diaphragm chambers having a closed space with a portion of walls formed by a diaphragm, thereby volume of the closed space being changed by operation of a drive section;
• the respective piping between each extraction tower and the respective diaphragm chamber being equipped with a pressure-regulating chamber and an on/off valve to adjust the internal pressure.