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Vacuum dryers are used for parts with complicated form or which do not tolerate the higher temperature of hot-air dryers. Combined dryers with hot-air and vacuum or infra-red and vacuum are used with light weight parts that do not posses enough heat to evaporate the water in vacuum. The vacuum dryers can be equipped with pneumatically operated door and automatic valves.
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The Krauss-Maffei Helix Dryer BD is a special variant of the helical mixer dryer HD.
A study group including leading european pharmaceutical manufacturers and KMPT developed a joint requirement profile providing the benefits of different drying equipment in one machine. The Krauss-Maffei Helix Dryer BD offers major benefits in comparison to conventinal drying systems in the production of active pharmaceutical ingredients.
It is designed for the processing of small batches that requires a precisely controlled operating environment and total product containment. Key features of the dryer are its compact dimension for mobility and the optional setup with a central drying station hosting drive unit, vacuum connection and heating/ cooling supply in combination with a stationary lifting device and multiple, mobile product vessels with vapor filters.
By connecting the product vessels with appropriate isolation valves to a mechanical separation equipment such as Krauss-Maffei Pharma Centrifuge, the product remains fully contained throughout the complete processing sequence. Different dryer vessel sizes can be connected to the central drying station for added operating flexibility. No product transfer is required from the filtration step to the drying/ mixing operation and to the final discharge point which can be provided with various high-containment devices. The entire process train can be placed on one individual floor or inside a single clean room.
Main Applications
API's, antibiotics, amino acids, pharmaceutical intermediates, fine chemicals.
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The ES Junior series of continuous vacuum driers are the ISVE mini-driers traditionally used by small craftsmen.
They enclose all the technology and experience developed over twenty years of research into the application of the vacuum process in the treatment of wood.
The machine, operating at low temperatures, allows the timber to lose its water content without subjecting it to thermal changes which can cause cracking and warping.
The evaporated water which remains in suspension in the container keeps the drying material surface continuously humidified, avoiding in this way the formation of small cracks which, in other drying systems is quite frequent.
The humidity level which is necessary between environment and material is constantly maintained by a condenser which precipitates the steam in suspension.
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rotary vacuum dryer
Rotating double cone vacuum dryer, 4000 lt capacity, provided with a sleeve filter cleanable by a nitrogen injection system automatically working at pre-set intervals. Powder recover into the cyclone beneath. Butterfly type discharge valve, installed opposite the manhole, provided with pneumatic actuator
Excellent thermal exchange coefficient. The speed of the fluid in the jacket, is much higher than traditional models.
No thermal inertia. The capacity of the double jacket is much smaller than traditional models.
Stepless speed variation by means of a frequency inverter to perfectly adjust this parameter to the product and process features.
Wide range of sealing systems on the internal piping for vacuum suction: stuffing box group, mechanical seal and double mechanical seal. Easily disassembled from the outside.
Positioning device for loading and unloading.
Hydraulic rotary joints for distribution and outflow of heating fluid.
Safety systems in compliance with CE directives.
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Vrieco-Nauta vacuum dryers were developed from the already successful conical screw mixer line. The superior mixing quality of the Vrieco-Nauta mixers is utilized to efficiently present fresh product to the heated surface area. Heat is transferred into the product through a jacketed vessel wall causing solvents or moisture residues to evaporate. The entire vessel is run under vacuum to further aid in moisture removal by lowering the saturated vapor pressure.
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Horizontalt type vacuum dryer: Pandadry
Large size vacuum dryer model PANTADRY, 18 cumt capacity. The agitator shaft has dual supporting system. Hydraulic driving motor. Riveted heat insulation outer panelling. Heated and insulated sleeve filter placed over the drying chamber.
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Complete vacuum drying systems are available to meet the needs of each application. The systems typically include a mixer/blender, filter, condenser, vacuum pump and condensate receiving vessel. Complete skid mounted systems are available with controls.
Illustrated is a Vertical Blender combined with the ancilliary items mentioned above. All Ross Mixers and Blenders are available with complete vacuum and control systems.
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DRUVATHERM® Vacuum Shovel Dryer
Intensive mixing prevents temperature and moisture gradients in the product
High heat transfer means more effective drying
Gentle thermal treatment of the product under vacuum
Multiphase process (mixing, granulating, drying, cooling)
Economical solvent recuperation
Machine Type
Lödige DRUVATHERM® Shovel Dryers are batchprocess vacuum dryers. The main shaft with shovels is regulated by frequency converter to achieve an optimal adjustment to the process. The special mixing elements rotate in the cylindrical drum, which is equipped with a heating/cooling jacket, and generate a three dimensional movement of the product (mechanically generated fluid bed). The resultant frequent contact of particles with the heat transfer surface reduces the drying times to a minium.
Standard Configuration
The product movement creates an intensive contact of individual product particles with the heated wall of the machine and at the same time treats the product as gently as possible. Rotating choppers, installed inside the drum, provide additional dispersion during possible product transition phases and are available as an option. Fine particles in the solvent vapours are collected by a pneumatically cleaned filter mounted on the machine and are returned to the product bed for drying.
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High evaporation capacity with careful treatment of temperature-sensitive products. Combination of several processes steps, e.g. mixing, drying, and granulating.
Changing phases will be mastered without any problems by applying adapted driving techniques.
Homogenizers, e.g. designed as chopper mills, avoid the formation of agglomerates. Low residual moisture in the product will be achieved in combination with condensers of appropriate capacities.
Applications:
- Thickening of suspensions and solutions up to the dry product under vacuum
- Drying and cooling of bulk materials
- Pasteurizing/sterilizing Coating of pourable products
- Drying of filter press cake
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