SCEO_L16 - Selected Chemical Engineering Operations...

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Selected Chemical Engineering Operations Selected Chemical Engineering Operations LECTURE - 16
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Selected Chemical Engineering Operations Mechanical Separations • Principle of cake filtration • Pressure drop through filter cake • Compressible and incompressible cake • Filter medium resistance • Overall resistance • Constant pressure filtration • Constant rate filtration • Principles of Centrifugal filtration • Filtration equipment • Principles of clarification
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Selected Chemical Engineering Operations The Filter Press • A filter press contains a set of plates designed to provide a series of chambers or compartments in which solid may collect • The plates are covered with a filter medium such as canvas • A chamber is therefore formed between each pair of successive plates • The slurry is introduced through a port of in each frame • Filtrate passes through the cloth on each side – so that two cakes are formed simultaneously in each chamber and these join when frame is full • Filtration is continued until liquor flows out the discharge or the filtration pressure suddenly rises
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Selected Chemical Engineering Operations The Filter Press • These occurs when the frames are full of solid and no more slurry can enter – the press is then said to be jammed • Wash liquid may then be admitted to remove soluble impurities from the solids • After that the cake may be blown with steam or air to displace as much residual liquid is possible • The press is then opened, and the cake of solids removed from the filter medium and dropped to a conveyor or storage bin
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Selected Chemical Engineering Operations The Filter Press • Advantages – Because of its basic simplicity it is versatile and may be used for a wide range of materials under varying operating conditions of cake thickness and pressure – Maintenance cost is low – It provides a large filtering area on a small floor space and few additional associated units are needed – Most joints are external and leakage is easily detected – High pressure operation is usually possible – It is equally suitable whether the cake or the liquid is the main product
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Selected Chemical Engineering Operations The Filter Press • Disadvantages – It is intermittent in operation and continual dismantling is about to cause high wear on the cloths – Despite the improvements mentioned above it is fairly heavy on labor
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Selected Chemical Engineering Operations The Filter Press
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Selected Chemical Engineering Operations The Filter Press
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This note was uploaded on 02/29/2012 for the course CHEMICAL 312 taught by Professor Profsureshgupta during the Spring '12 term at Birla Institute of Technology & Science.

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SCEO_L16 - Selected Chemical Engineering Operations...

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