Bokela - Model BoCross Dynamic -Crossflow Filter

Dynamic crossflow filtration with the BoCross Dynamic filter is a unique process for microfiltration and ultrafiltration of microfine to nanoscale suspensions. Tasks such as thickening, washing and clarifying are performed by the BoCross Dynamic filter in continuous operation with permanently high throughput rates.

The dynamic shear gap principle ensures almost ideal physical conditions for the separation process. The process and machine principles allow an exceptionally high concentration of suspensions to be processed in one run. Under the influence of the shear forces, the concentrate still remains flowable even with high thickening. Therefore, highly viscous and highly concentrated suspensions can still be processed. Compared with conventional crossflow filtration, five to six times higher concentrations are achieved with the BoCross Dynamic filter.

The BoCross Dynamic filter has a modular and hermetically sealed construction. It is available with filter sizes from 0.1 m² to 8 m² and can be used for an operating pressure of up to 6 bar (a). and an operating temperature up to 100 °C.

The BoCross Dynamic filter consists of disc-shaped filter modules arranged in a row, forming a completely closed system of process chambers. Each filter module is equipped with filter media on both sides. The modules have central openings for the filter shaft, which carries the rotors of the individual suspension chambers. The suspension flows from chamber to chamber in a meandering manner, whereby the concentration increases successively, since filtrate drains off in each chamber. The thickened concentrate is discharged controlled in the last chamber by means of an exhaust valve. In each chamber separately washing liquid or other process liquids can be supplied.