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Comment PDF Separation Processes

Facts at your Fingertips: Filter Aids

By Scott Jenkins |

Cake filtration is a common operation across many sectors of the chemical process industries (CPI). In cake filtration, the solid being filtered acts as a screen so that particles of the suspension are retained by the medium, resulting in the formation of filter cakes. In some cases, filtration can be difficult if the material being filtered is highly viscous, highly compactible or deformable, or if the filter cake formed in the filtration is very small or highly resistant to flow. For such situations, the addition of filter-aid material can greatly improve the efficiency and effectiveness of the filtration. Filter aids enable cake filtration to be used for a larger group of suspensions, including those with wider particle-size distributions, larger solid concentrations, and gel-like and highly compactible particles. This one-page reference provides information on the properties of common filter-aid materials and how they are used in industrial filtration.   Filter aid function Filter aids are inert particulate or fibrous materials that are introduced into a filtration operation in one of two ways — as a filtration pretreatment called “precoat” or by adding filter aid to the liquid to be filtered, referred to as “bodyfeed.” …
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