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Rotary pressure filter (RPF)
Precise separation of suspensions

The BHS rotary pressure filter (type RPF) is a continuously operating filter for pressure filtration, allowing gas-tight cake treatment in several separate process steps. The cake can be discharged under atmospheric conditions.

The filter operates at a pressure of up to 7 bar (g). In all process steps, pressure is generated by feeding of the suspension and/or the washing and extraction agents and not by layers of gases. Depending on the design, numerous further process steps can be accomplished after the main solid-liquid separation.

Single- or multi-stage cake washing
Displacement, counter-current or closed-cycle washing
Solvent exchange
Steaming, extraction, etc.
Subsequently, the filter cake can be dewatered mechanically, or, if desired, dried thermally. All process steps are performed in separate cells inside the filter. In this way, the filtrates can be drained off separately.

An integrated discharge system allows the filter cake to be discharged at atmospheric pressure directly to the downstream equipment. After automatic cake discharge, the filter cloth is cleaned. It is then ready for a new filtration cycle.

The BHS rotary pressure filter is a further development of the solid filter described in the technical literature.

Process criteria

The BHS rotary pressure filter works on the principle of cake filtration and can fulfill the following process criteria:

Mode of operation continuous
Operating pressure up to 7 bar (g)
Operating temperature up to 160 ºC
Solids content (suspension) up to 60 % (weight)
Cake thickness up to 175 mm
Particle size 10 - 500 µm
Filtration capacity (suspension) up to 15 m3/m2 h
Filtration capacity (dry solid) up to 15.000 kg/m2 h
Active filter area 0.12 - 8.6 m2

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