Rotary Vacuum Paddle Dryer (RVPD)
Many powdered solid products require dehydration and solvent recovery from wet cake and slurries.
ACME Rotary Vacuum Paddle Dryers (RVPD) are a perfect solution to overcome these issues. These RVPDs are specially designed to dry products that are temperature sensitive, are susceptible to oxidation, volatile, and those that are toxic in nature. ACME RVPDs are great substitutes to other types of dryers that cause air-contamination. ACME provides turnkey solutions covering design to fabrication, installation and commissioning of the entire RVPD plant.
ACME's RVPD is the most versatile dryer which can handle the products having lumping properties. The integrated drying, mixing and breaking process in single unit under vacuum provides enhanced drying efficiency with low LOD values at low working temperatures, and process economy due to high solvent recovery. It can be used for low temperature drying, extraction of useful solvents, reaction, crystallization, and recovery of solvent.
CONSTRUCTION & OPERATIONS
RVPD consists of jacketed shell with a central agitator shaft having paddle/blades which rotates at a very low RPM. The low clearance agitator paddles/blades scrape the material against the internal heated surface of shell, which provides maximum heating consistently. For uniform drying of product, heat transfer fluids such as hot water or steam is circulated through the shell jacket. This completely jacketed system provides optimum dryer efficienc.
The material which is to be dried is charged as a batch from the top of the shell. As the paddle agitator rotates the product is heated by means of heating media circulated in jacket from the outside and also through the hollow agitator from the inside which increases drying surface and the rate of energy transfer. The paddle agitator is designed to facilitate heating, mixing, drying and discharging of the product, all-in-one. The drying process is carried out under vacuum. The vacuum inside the chamber decreases the pressure around the wet material to lower the vapor pressure of solvents thereby reducing the product solvent boiling point. Due to this the solvent evaporates faster, and enhances the rate of drying. The evaporated solvent pass through the pulsating dust filter before going into the condenser to prevent any solid escaping from the system.
The shell of the dust filter is also provided with the jacket/limpet coil for heating, to eliminate the condensation of solvent vapours in the dust filter chamber. The vapour then condensed, and the condensate is collected in the receiver tank. The automated or manual release of the discharge valve conveniently discharges maximum product, and eases the handling of product without any loss.
FEATURES
- CGMP-compliant equipment design & construction
- Short drying time
- Efficient design of paddle agitator
- Gives uniform size and homogeneous dried product
- Eliminates product handling and product exposure which ensures maximum operator & environmental safety
- Uniform contact between the material, and combined heat from the surface of the dryer and paddle agitator shaft
- Dried product contains very low final moisture content
- Ease of internal cleaning, operation, inspection and validation which eliminates the chances of product contamination
- High vacuum augments the integrated heated system to enable low temperature drying
- Operating cost reduction due to low energy consumption
- High heat transfer efficiency
- Maximum solvent recovery
- Eliminates degradation of product since there isn't over-exposure, higher temperature and drying time
- Pulsating filter facilitates dust free operation
OPTIONAL ACCESSORIES
ACME also supplies all the necessary units required for the entire dryer plant suitable for the given batch size
- Suitable variable speed drive for controlling the rotation of the dryer
- Lump breakers
- Suitable condenser and receiver for solvent recovery
- Advanced PLC control with HMI touch screen to ensure reproducibility of various batches
- Hot water system
- High vacuum pump unit with FLP motor
- Safety and instrumentation controls consisting of temperature controls, process controls, overload protection, emergency stop, load cells and vacuum relief valves
- Staircase & gantry for the operator
- Pulse jet type dust filter to be installed inside the shell
- FLP motors and electricals
- RCVDs are available in SS 304, 316 & 316L grades. ACME can provide RCVDs in wide range of MOCs also including Alloy 20, Alloy 22 and Alloy C276 (Hastelloy C)
APPLICATIONS
- API
- Foodstuff
- Chemicals (Inorganic, Organic, Intermediates)
- Handling temperature-sensitive materials
- Agrochemicals
- Dyestuff