Separation system for Pharmaceutical and Biotechnical applications

BTAX 215

The BTAX centrifuge is specially designed for biotechnical processes such as cell harvesting, broth clarification and the separation of cell debris. The centrifuge has a very high separation efficiency and can be installed in a closed system. To ensure cleanliness, the BTAX can be heat pasteurised to 100oC.

Available modelsThe BTAX centrifuge is available in four versions

• BTAX 215S-31 CEP Paring disc version.

• BTAX 215S-31 CEFP Paring disc version, explosion protected.

• BTAX 215H-31 CEP Hermetic version.

• BTAX 215H-31 CEFP Hermetic version, explosion protected.

All BTAX models are gastight. The complete system can be supplied in an explosion-protected version when required.

Throughput capacityActual throughput is in the range of 0-12 m3/h depending on paring disc size and design, as well as on the amount and type of solids in the feed, temperature, viscosity, required degree of clarification etc. Max hydraulic capacity of disc stack is much higher.

Efficient solids ejectionDuring separation, solids collect in pockets recessed in the bowl wall which avoids undesirable solids build-up, and minimizes disturbances during solids ejection. The pneumatically operated solids-ejecting system ensures fast and efficient discharges resulting in a clean bowl.

Axial discharge channels lead from the solids pockets to valves, which are held closed by a spring loaded valve slide. To eject solids from the bowl during operation the slide is lowered momentarily by a very short injection of compressed air or gas through the hollow bowl spindle. This opens the valves and the solids are ejected.

High separation efficiencyThe high speed of the bowl creates a peripheral centrifugal acceleration of 12,000 gravities. This gives the BTAX an extremely high separation efficiency that can capture particles down to 0.1 µ in diameter.

Large solids spaceLong periods between ejections is possible thanks to the large (14 l) solids space, which results in better separation and drier solids.

Paring disc designIn this version the clarified liquid is continuously discharged under pressure by a paring disc, which is a stationary impeller that converts the rotational energy of the liquid into pressure. With the paring disc design there is no need for a down-stream pump.

Hermetic inlet and outletThe bowl is always completely filled with liquid in the hermetic version. This eliminates the risk for oxidation and airborne infections and ensures gentle treatment of the product.

Efficient coolingThe frame hood and bowl casing are jacketed for cooling. When separated solids need to be cooled, a jacketed cyclone can be supplied.

Totally contained systemTo protect both the product and environment, the BTAX 215 is provided with a special water cooled axial seal under the bowl to prevent contamination of the drive system.

Sturdy frame and belt drivePower is transmitted from the vertically mounted motor to the spindle cartridge by the flat-belt drive inside the sturdy frame. The vertical bowl spindle which supports and drives the separator bowl is designed as a replaceable cartridge unit.

MaterialAll liquid-wetted parts are made of high-grade stainless steel. The bowl body and the valve slide are made of steel quality, specially developed to resist corrosion and with the high

tensile strength needed for the high g-force generated in the BTAX centrifuge. The frame hood, solids receptacle and cyclone as well as bowl casing are of stainless steel and the frame is epoxy-enamelled cast iron. Gaskets are of EPDM, Viton or Nitrile.

Standard equipmentCentrifuge with electric motor, small or large cyclone. The large cyclone has cooling jacket, sight glass and connections for level transmitter. Foundation frame and vibration dampers, tank for compressed air with solenoid valve for discharge, vibration monitor and speed transmitter, oil pressure gauge and switches, one set of tools and one intermediate service kit.

Optional equipmentCover interlock switch, special tools for cartridge, intermediate and major service kit, cartridge service kit and service kit for foundation feet.

1. Feed valve2. Centrate out3. Pneumatic butterfly valve4. Cooling jacket5. Bowl6. Cooling water7. Axial seal8. Check valve9. Spindle cartridge

10. Oil filler and gauge11. Flat driving belt12. Cyclone with recirculation tube13. Solids pockets14. Pneumatically operated slide15. Motor16. Unibase frame17. Foundation

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Cross-section of BTAX 215 paring disc version

Ancillary equipment necessary for operation

Electrical and pneumatic system consisting of

• Starting equipment with y/d-starter, DC-brake and main switch.

• Control equipment: A. Not explosion protected version with built-in operator´s control pannel. A remote control panel is available as an option, or B. explosion protected version including a simple control cabinet to be placed outside the hazardous area and an operator´s control panel to be placed in the hazardous area. C. Pneumatic unit with solenoid valves, pressure reducing valves and pressure switch. Normal and explosion- protected versions are available.

Valve module including inlet valves for either safety liquid or process feed, and outlet valves to direct the centrifugate to either drain or process outlet. Also included is a flow trans-mitter and regulating valve for the feed and a counter pressure regulating valve for the outlet.

Service liquid unit with valves to control flushing, cooling and sealing liquid. Flow switches for the sealing liquid are also included.

For centrifuges explosion protected with inert gas the follow-ing additional units are needed: A. Inert gas regulating unit with valves and flow-switches for flow control. B. Seal pot unit to give slight overpressure in the whole system. C. Solids receiving unit with pneumatic pump to handle the discharged solids.

Technical dataMotor size Standard 30 kW, controlled torque Explosion protected 30 kW, controlled torque EEx de IIB T4

Throughput and power consumptionParing disc version Small paring disc 0-5 m3/h, 10-17 kW Large paring disc 2-12 m3/h, 15-25 kWHermetic version 0-12 m3/h, 13-28 kW

Starting time approx 7 minutes

Stopping time With DC brake approx 20 minutes

Max bowl speed 6,065 rpm

Solids space volume 14 litres

Caulk thickness 0.4 mm

Cooling water consumption Cooling jacket 200-400 l/h Hermetic seal 60-80 l/h Axial seal 30 l/h Cyclone with cooling jacket 200-400 l/h

Gas consumption for solids discharge 20 Nl/discharge

Max. pasteurization temperature 100oC

Discharge valve 24 VDC, 24 VAC, 48 VAC, 110 VAC, EEx d IIC T5

Inert gas consumption For purging 20 Nm3/h For normal operation 100-400 Nl/h

Control and starting equipment (not explosion-protected).

Inert gas regulating unit. Valve module and service liquid unit.