Principle, Construction, Working, Uses, Merits and Demerits of Filter Leaf : Pharmaceutical Guidelines -->

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Principle, Construction, Working, Uses, Merits and Demerits of Filter Leaf

This apparatus consists of a drainage screen covered in filter cloth extending longitudinally.

Filter Leaf

Principle

  • This apparatus consists of a drainage screen covered in filter cloth extending longitudinally.
  • It works as a sieve or strainer due to surface filtration.
  • The rate of filtration can be increased by applying vacuum or pressure.

Construction

  • A leaf filter consists of an outer frame containing a drain screen or grooved plate
  • There is no restriction on the shape of the frame, be it circular, square or rectangular
  • Filter cloth covering the entire unit
  • Filtrate exits through a suction connection on the inside of the frame



Working

  • Slurry immerses the filter leaf.
  • The outlet has a vacuum system.
  • A filter cloth filters the slurry.
  • The filtrate finally exits the drainage canal and enters the receiver through the outlet.
  • Air is passed through the tunnel to facilitate the removal of cake.

Uses

  • Filter is used for filtration of slurries with low solid content, e.g., dilute suspensions, where the solid content is less than 5%.

Merits

  • A batch process filter is the simplest type.
  • In order to increase the filtration surface area, a number of units can be connected in parallel.
  • There is the possibility of obtaining a vacuum or applying pressure up to 800 kilopascals.
  • The operation of the filter leaf is relatively inexpensive.
  • Cleaning is highly effective.
  • Any vessel can be used to filter the slurry.
  • Using a vessel of water, you can wash the cake by immersing the filter.

Demerits

  • Processes like these are not continuous.
  • In most cases, it is used where there are less than 5% solids in the liquid to be filtered.
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Ankur Choudhary is India's first professional pharmaceutical blogger, author and founder of Pharmaceutical Guidelines, a widely-read pharmaceutical blog since 2008. Sign-up for the free email updates for your daily dose of pharmaceutical tips.
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