Another type of liquid-liquid-extraction equipment that is used in our laboratory is the Kühni ECR 32 column from Sulzer. This agitated column is useful when a high number of stages is required for the separation. It also has the advantage that it allows to work easily with almost any O/A ratio. The active height and volume is about 1.2 m and 0.9 L, respectively. It is entirely jacketed to be heated or cooled by a liquid medium and its height can be adapted by adding or removing sections. By varying the active volume, the column can be used with a total flow range of 5-25 L/h.
