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Perforated basket
Centrifuge
KASHISH WILSON
ASSISTANT PROFESSOR
MM COLLEGE OF PHARMACY, MM(DU) MULLANA AMBALA
Introduction
 The centrifuge is used for filtration. The perforated wall separates solids from
liquids based on the difference in densities. In the bowl, there are
perforations along the sides. The perforated wall allows liquid to pass, while
solids are caught in the bowl during the liquid phase.
Principle...
 Perforated basket (bowl) centrifuge is a filtration centrifuge.
 The separation is through a perforated wall based on the difference in the
densities of solid and liquid phases.
 The bowl contains a perforated side-wall.
 During centrifugation, the liquid phase passes through the perforated wall,
while the solid phase is retained in the bowl.
 The solid is removed after cutting the sediment by a blade after stopping the
centrifuge.
Construction...
 Perforated basket (bowl) centrifuge is a filtration centrifuge.
 The separation is through a perforated wall based on the difference in the
densities of solid and liquid phases.
 The bowl contains a perforated side-wall.
 During centrifugation, the liquid phase passes through the perforated wall,
while the solid phase is retained in the bowl.
 The solid is removed after cutting the sediment by a blade after stopping the
centrifuge
Working..
 The material is kept in the basket when the basket is stationary.
 Power is applied to rotate the basket and maximum speed must be attained
quickly.
 The basket runs at 1000 revolutions per minute.
 During centrifugation, the liquid passes through the perforated wall, while
the solid phase remains in the basket.
 The liquid leaves the basket and is collected at the outlet. The cake is then
spun to dry as much as possible.
 After a definite period of time, the power is turned off. By applying a brake
the centrifuge is stopped. The basket is brought to rest.
 The solid cake is cut using a blade and then unloaded manually.
Uses
 Performed basket centrifuge is extensively used for separating crystalline
drugs (such as aspirin) from the mother liquor.
 Free flowing product can be obtained because mother liquor is removed
completely.
 It is also used for removing unwanted solids from a liquid. For example,
precipitated proteins are removed from insulin.
Advantages...
 The centrifuge is very compact and it occupies very little floor space.
 It can handle slurries with a high proportion of solids and even those having a
paste-like consistency.
 The final product has very low moisture content.
 In this method, the dissolved solids are separated from the cake.
 The process is rapid.
Disadvantages....
 The entire cycle is complicated, resulting in considerable labor costs.
 It is a batch process.
 If the machine is adapted for prolonged operation, there is considerable wear
and tear of the equipment.
Thanks.....

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Presentation (11).pptx

  • 1. Perforated basket Centrifuge KASHISH WILSON ASSISTANT PROFESSOR MM COLLEGE OF PHARMACY, MM(DU) MULLANA AMBALA
  • 2. Introduction  The centrifuge is used for filtration. The perforated wall separates solids from liquids based on the difference in densities. In the bowl, there are perforations along the sides. The perforated wall allows liquid to pass, while solids are caught in the bowl during the liquid phase.
  • 3. Principle...  Perforated basket (bowl) centrifuge is a filtration centrifuge.  The separation is through a perforated wall based on the difference in the densities of solid and liquid phases.  The bowl contains a perforated side-wall.  During centrifugation, the liquid phase passes through the perforated wall, while the solid phase is retained in the bowl.  The solid is removed after cutting the sediment by a blade after stopping the centrifuge.
  • 4. Construction...  Perforated basket (bowl) centrifuge is a filtration centrifuge.  The separation is through a perforated wall based on the difference in the densities of solid and liquid phases.  The bowl contains a perforated side-wall.  During centrifugation, the liquid phase passes through the perforated wall, while the solid phase is retained in the bowl.  The solid is removed after cutting the sediment by a blade after stopping the centrifuge
  • 5. Working..  The material is kept in the basket when the basket is stationary.  Power is applied to rotate the basket and maximum speed must be attained quickly.  The basket runs at 1000 revolutions per minute.  During centrifugation, the liquid passes through the perforated wall, while the solid phase remains in the basket.  The liquid leaves the basket and is collected at the outlet. The cake is then spun to dry as much as possible.  After a definite period of time, the power is turned off. By applying a brake the centrifuge is stopped. The basket is brought to rest.  The solid cake is cut using a blade and then unloaded manually.
  • 6. Uses  Performed basket centrifuge is extensively used for separating crystalline drugs (such as aspirin) from the mother liquor.  Free flowing product can be obtained because mother liquor is removed completely.  It is also used for removing unwanted solids from a liquid. For example, precipitated proteins are removed from insulin.
  • 7. Advantages...  The centrifuge is very compact and it occupies very little floor space.  It can handle slurries with a high proportion of solids and even those having a paste-like consistency.  The final product has very low moisture content.  In this method, the dissolved solids are separated from the cake.  The process is rapid.
  • 8. Disadvantages....  The entire cycle is complicated, resulting in considerable labor costs.  It is a batch process.  If the machine is adapted for prolonged operation, there is considerable wear and tear of the equipment.