PerMix PTPD series Vacuum Dryers are a turbulent mixing reactor-dryer. It is used as a high-speed paddle dryer, chemical reactor or, if both processes are combined, as a dryer-reactor. They are used with particular success in agglomeration-free rapid drying, heterogeneous reactions with systems of different substances, extraction, sterilization and in general for vacuum, positive-pressure, thermal energy and comminuting aids.
PTPD Vacuum Dryers are widely used in the chemical, metallurgic and pharmaceutical industries among others. Standard sizes range from 3 liters up to 5,000 liters and pressure from 10 mbar up to 50 bar.
The considerably superior heat transfer characteristics of PTPD Vacuum Dryers are mainly attributable to the fact that external heat applied through the contact surfaces of the mixing vessel and mixing element, supplemented by frictional heat generated during the mixing process. When operating at the usual speed, this accounts for 30 to 35 per cent of the total heat applied. Heat transfer is not inhibited by agglomerates or layers of material adhering to the internal components of the tank. This is largely due to the comminuting units and the high-speed, edge-sweeping paddle agitators, which ensure rapid circulation of the materials at the contact faces.
PerMix PTPD Vacuum Mixing Dryer is used for drying operations usually operated at higher than critical speed, at any rate for fine drying after the phase change. In conjunction with the action of the rotary cutter and multichopper units, this causes a large degree of fluidization of the material to be dried and thereby promotes the evaporation of the fluids. The huge rate at which evaporation is effected practically eliminates the need for the usual auxiliary processes, such as scrubbing with solvents.
PerMix PTPD Vacuum Mixing Dryer can be filled from 50 to 75 percent. By virtue of the rapid change of material at the contact face, optimum use is made of the overall heat exchange area. The built-in rotary cutter unit ensures that the product is free from agglomerates and the grain size is so fine that, as a rule, no subsequent micronizing is required. The filter chamber connected with the vacuum dome has a mechanically or pneumatically-operated device for cleaning the filter. Additional units for the removal of vapour or recovery of solvents take account of individual user requirements.
1) Cost savings: The PTPD Vacuum Dryers combines several machines: less pipe-work, fewer control and space requirements
2) Short reaction times
3) Optimum heat transfer via large contact areas
4) Turbulent mixing by mechanical fluidization of reaction materials
5) No dead areas in reactor and the discharge areas
6) The PTPD Vacuum Mixing Dryer can also be supplied with removable mixing tools
7) Easy to clean and sterilize
8) Long service life through the use of corrosion resistant reactor materials (Stainless Steels, Hastelloy, Titanium, Nickel Alloys)
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