Dryers conical mixer

Since the dryer is a batch-operating unit, it is commonly used in the pharmaceutical industiy to maintain batch identification. In addition to pharmaceutical materials, the conical mixer diyer is used to dry polymers, additives, inorganic salts, and many other specialty chemicals. 

Conical Mixer Dryer The conical mixer dryer is a batch-wise operating unit commonly used in the pharmaceutical and specialty chemical industries for the drying of solvent or water wet, free-flowing powders. The process area is a vertically oriented conical vessel with an internally mounted screw. Figure 12-80 shows a schematic of the bottom drive conical mixer dryer. The dryer utilizes the heatable, internal rotating screw to provide agitation of the batch of material and thus improve the heat and mass transfer of the process. Because it rotates around the full circumference of the vessel, the screw provides a self-cleaning effect for the heated vessel walls. 

FIG. 12-SO Bottom drive conical mixer dryer. (Krauss Majfei.)... 

The first type of agitated dryers is the vertically agitated dryer (shown in Figure 6.4 as a cone dryer). Batch cone dryer (or conical mixer dryer) is a conically shaped vessel, with... 

For the first group the following types of dryers are generally used convective (tray, band, fluid bed, flash dryers, and their modifications) or contact (vacuum dryers such as double-cone dryer-blender, conical dryer with rotating helical mixer, paddle dryer). Pastelike materials are dried in tray dryers, band dryers equipped with extruding devices, and spin-flash dryers. Finally, thin pastes can be dried in spray dryers or on fluid beds or spouted beds of inert particles. Small amounts of solutions and suspensions are generally freeze-dried, especially if the product is thermolabile. 

Conical Dryer with Screw Mixer The conical dryer with screw mixer is similar in principle to the double-cone dryer-blender although the vessel is stationary and solids are mixed by epicyclic screw mixer (Figure 33.13). For pressures from 25 to 150 mbar and wall temperatures from 40°C to 60°C, Simon [6] reports evaporation rates of water up to 10 kg/h m. Units up to 5 m are commercially available. The dryer has no dead spaces and is easy to clean. 

FIGURE 33.13 Conical vacuum dryer with epicyclic screw mixer (1, steamjacket 2, hatch 3, feed tube 4, exit port and valve 5, motor 6, drive arm 7, mixing auger). 

Dryer Type Plate Drum Tumbling Vibrating Conical Thin Film Paddle Mixer-Kr... 

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