Rotary Vacuum Paddle Dryer (RVPD)
High-Efficiency Drying with Paddle Agitation Under Vacuum
At Liuminex, we design and manufacture Rotary Vacuum Paddle Dryers (RVPDs) engineered for low-temperature, high-efficiency drying of sensitive and hazardous materials. Designed for batch operation under deep vacuum, RVPDs offer gentle yet thorough drying with excellent product recovery, making them ideal for pharmaceutical, chemical, food, and agrochemical industries.
Ideal for Drying
- Heat-sensitive compounds (APIs, vitamins, enzymes)
- Solvent-moist materials (crystals, wet cake, slurries)
- Hygroscopic and toxic products
- Agrochemicals, catalysts, and dyes
- Herbal extracts and nutraceutical powders
- Thermoplastic resins and specialty chemicals
Key Features
- Paddle agitator ensures uniform mixing and drying
- Vacuum operation lowers drying temperature to protect product integrity
- Solvent recovery through condenser and receiver system
- Gas-tight and dustproof – suitable for hazardous or flammable solvents
- Hinged shell or manholes for easy cleaning and inspection
- Minimal power consumption with maximum thermal efficiency
Technical Specifications
Parameter | Specification |
Working Capacity | 50 to 10,000 Litres |
Drying Mechanism | Paddle agitator with jacketed shell |
Vacuum Level | Up to 0.1 mbar |
Agitator Speed | 5–30 RPM (adjustable via VFD) |
MOC Options | SS304 / SS316 / Hastelloy C / Alloy 20 |
Heating Medium | Steam / Hot water / Thermic fluid |
Drying Temperature | Up to 150°C (depending on application) |
Discharge System | Manual, pneumatic, or screw-type bottom discharge |
Drive Type | Geared motor with chain or direct coupling |
Optional Features
- Lump breaker blades or internal breakers
- Load cell integration for batch monitoring
- Jacketed condenser with receiver for solvent recovery
- Nitrogen purging for inert drying atmosphere
- Flameproof design (ATEX / IECEx zones)
- PLC-SCADA automation for pharma-grade applications
- Vacuum-rated filtration system on vapor line
Industries Served
- Active Pharmaceutical Ingredients (APIs)
- Bulk drugs & fine chemicals
- Agrochemicals & Pesticides
- Herbal extract drying
- Food & nutraceuticals
- Pigments & Dyes
- Specialty Polymers & Plastics