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Comment PDF Separation Processes

Clarifying Liquid Filtration

By José M. Sentmanat José M. Sentmanat Liquid Filtration Specialists, LLC |

  There are various reasons that make filtering necessary in processes. The raw materials might have impurities that require removal at the start of the process. After the initial mixing to produce the process slurry, the mother liquor could have solids that need a separation process. Unwanted solids could also form by a chemical reaction during the production of the process liquid. The nature of the solid impurities will ultimately determine the type of equipment needed for the separation process. Sometimes, a preliminary crude separation is done by decantation, clarification, settling, coalescing or centrifuging. For some processes, a preliminary coarse prefiltration with a basket filter or a strainer is used to remove the bulk of large crystalline solids, using a relatively open filtering medium. After this coarse separation (if needed), the actual fine liquid-filtration process is performed to produce the final, clear filtrate product. This article offers recommendations and guidelines to apply in the selection, operation and troubleshooting of liquid filters. The first step in deciding which filtration method to use in a process begins with laboratory testing.   Laboratory testing The importance of laboratory testing…
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