Disc stack bowl

Figure 4.14. Separation of cell lysates containing pharmaceutical products, employing large-capacity centrifuges that are configured with tubular bowl (A), multi-chamber bowl (B), disc stack bowl (C), or decanter (scroll) bowl (D).

FIG. 18-154 Disc stack-centrifuge bowls a) separator, solid wall (b) recycle clarifier, nozzle discharge. 

In the second type of nozzle-discharge disc-stack centrifuge the solids are collected in a triangular storage space with nozzles located around the largest diameter of the bowl. The size and number of nozzles can be... 

Disc stack centrifuge Scroil decanter centrifuge Single and multi- bowl basket centrifuges Tubular bowl centrifuge... 

Figure 1.13 Photograph (left) of an ejecting, self-cleaning, disc stack centrifuge showing an external view of the disc bowl and accompanying motor drive. Also shown (right) is a typical disc stack arrangement. Both photographs with permission from Alfa Laval.

In the alternative screen bowl design the conical section of the bowl is shortened and a supplementary cylindrical section is attached in an effort to promote more efficient separation. Other design variants rely on the addition of baffles, helical discs, vanes, conical disc stacks or fins, all of which alter the flow and/or residence time distributions within the centrifuge. Figure 1.15 shows an example of a decanter centrifuge fitted with a vane stack. 

Disc stack centrifuges, tubular bowl centrifuges, filtration centrifuges Alfa Laval company also has Thermal and Plow divisions Other company connections... 

In addition to the nematic phase (termed Nq), disc or bowl-shaped molecules may stack in layers (discotic smectic), or much more often, to columns forming so-called columnar (Col) discotic or columnar pyramidic... 

Disc stack, decanter and tubular bowl centrifuges are used for a wide range of separation duties in the pharmaceutical and fermentation industries, including liquid-solid, liquid-liquid, liquid-liquid-soUd separations, and liquid-solid extraction. Typical process steps include cell harvesting, concentration and washing, cell debris removal, inclusion body recovery and purification, solvent extraction, dewatering and recovery. 

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