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Comment PDF Separation Processes

Thin-Film Drying Offers Deep Benefits

By Georgios Raouzeos, Buss-SMS-Canzler GmbH |

Contact agitated dryers are used for drying wet powders, slurries, filter cakes, and applications where off-gases during the drying cycle must be contained. If the applications are also heat-sensitive, such as specialty chemicals, polymers, food products and pharmaceuticals, contact drying must take place at low heating temperatures, at residence times in tune with the tolerance of the product, and occasionally in conjunction with a heated sweep gas (stripping medium). These operating conditions plus the ever-present wall fouling by the product, considerably reduce the effectiveness of commonly used agitated dryers (for instance, paddle dryers and disc dryers) to the extent that they become inefficient. Therefore, there is a strong demand by the chemical process industries (CPI) for a high-performance, continuous agitated dryer. Thin-film drying technology (TFDT) meets these challenges. Instead of a heated sweep gas, thin-film dryers (TFDs) operate at a reduced pressure (0.01 bar or even lower). Retention time, which is normally measured in hours for paddle and disc dryers, is measured in minutes or even in seconds, and the fouling problem — a common deficiency of conventional agitated dryers — is eliminated or controlled. TFDT…
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