Filter leaf

• It is an apparatus consisting of a longitudinal drainage screen covered with a filter cloth

• The mechanism is surface filtration and acts as sieve or strainer

• Vacuum or pressure can be applied to increase the rate of filtration

• The leaf filter is consisting of a frame enclosing a drainage screen or grooved plate

• The frame may be any shape circular, square or rectangular

• The whole unite being covered with filter cloth

• The outlet for the filtrate connects to the inside of the frame through suction

Filter leaf Diagram

Working and uses

Use for the filtration of slurry which do not contain high solid content, about 5%, i.e. dilute suspensions

• Simplest form of filter used for batch process

• A number of units can be connected in parallel to increase the surface area of filtration

• Pressure difference can be obtained either with vacuum or using pressure up to the order of 800 kilopascals

• Labour costs for operating the filter leaf are fairly moderate

• The efficiency of washing is high

• The slurry can be filtered from any vessel

• The cake can be washed simply by immersing the filter in a vessel of Water

Filter leaf - Pharmaceutical Engineering B. Pharm Third Semester PDF Notes