Stripping column

The more theoretical separation stages have to be realized the more an extraction column becomes economically interesting compared to mixer-settlers since increasing the number of theoretical separation stages just increases the height of the column.The 2 liquid phases pass the column by gravity in a counter current manner. In extraction columns the same 2 process steps as mixing and settling have to be realized per separation stage. The mixing process in a column can be carried out in different ways differentiating the types of extraction columns. The settling processes in columns is mostly less efficient as in mixer-settlers since back mixing and dispersion entrainment are less avoidable and more or less fixed by the selection of the mixing process and hence the type of extraction column. De Dietrich Process Systems offers different column types as: Pulsed Packed Extraction Columns Pulsed Sieve-Tray Extraction Columns Oscillating Disc Contactors Rotating Disc Contactors Stirred Cell Extraction Columns Therefore the column type has to be selected very carefully according to the specific extraction process. This is mostly done either through existing experience for a given extraction process or supported by trials which we can carry out in our experimental hall. PULSED EXTRACTION COLUMNS As the name says, the way the dispersion energy is introduced into this column is done by means of a pulsator. We provide pulsed columns from DN50 to DN600 with borosilicate glass 3.3 as preferred column material. The total two-phase liquid hold-up in the column is pulsed up- and downwards. The flow through the internals as sieves or a packing generates the mixing process.