Filtration fundamentals

An understanding of die physical mechanisms involved in SLS is essoitial in resolving problems developed in existing machinery, or in avoiding iiiture difBculties vihen selecting new plant Many years of consultative practice [Purchas, 1987] in this area leads to a realisation of the value of sound quantitative relation i s b we variables such as liquor flow rate and visco, particle siae and concentration, filter medium pore rating and then-effects on the filtration process. 

The fibrate velocity v, through the dean filter medium is proportional to the pressure differential AP inposed over the medium the vdodty is inversefy proportional to the viscosify of the flowing fluid p. and the resistance of the medium These relationshps may be expressed mathematicalfy as  

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Depth filtration fundamentally differs from the use of media in which pore size determines the size of particle retained. Such filters may be said to be absolute at a particle diameter closely related to the size of the pore, so that there is a relatively sharp division between particles which pass the filter and those that are retained. An analogy with sieving may be drawn for this mechanism. The life of such filters depends on the number of pores available for the passage of fluid. 

Shoemaker, W., Filtration fundamentals, filter media, filter rating . Filtration Symposium (1974)... 

Thirdly, there are those chapters which only needed minor updating and amendments. These include Characterization of Particles Suspended in Liquids, Efficiency of Separation of Particles from Fluids, Hydrocyclones, Separation by Centrifugal Sedimentation, Filtration Fundamentals, Methods for Limiting Cake Growth, Pressure Filtration, Particle-Huid Interaction, Thermodynamics of Solid-Liquid Separation. 

A unit operation represents a basic physical operation in a chemical process plant. Examples are distillation, absorption, fluid flow, heat transfer operations, evaporation, extraction, drying, crystallization, and filtration. Fundamentals pertaining to a given unit operation are the same regardless of its industrial applications. This is how pioneers came up with the term unit operation. 

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