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Comment PDF Separation Processes

Solid-Liquid Separation: Classification, Design and Testing

By Scott Jenkins |

Whether to remove solid contaminants from a liquid or separate a solid product from a solvent, solid-liquid (S-L) separation is a common unit operation across the chemical process industries (CPI). This one-page reference provides an overview of S-L separation methods, design and testing. Sedimentation versus filtration Solid-liquid separation technologies can be classified according to thermal methods (dryers) or mechanical methods, where the flow direction of the solid and the liquid phases becomes a differentiating factor. In filtration technologies, both phases flow in the same direction, while sedimentation methods refer to those where the two phases flow in opposing directions (Figure 1). A special case, in which the flow directions of the solid and liquid phases are at right angles to each other, is referred to as cross-flow filtration. Figure 1. In sedimentation-based processes, the driving force is the earth’s gravity, while either positive or negative pressure drives filtration processes[/caption] In most sedimentation processes, the difference in density between the solid and liquid phases is utilized, but it is also possible to use electric or magnetic fields for separating purposes. In some cases, the natural sedimentation…
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