Vacuum Dryer
Drying Equipment
1. Product Overview
The vacuum dryer removes moisture at low temperature under negative pressure: evacuating the chamber lowers the boiling point of water. Each unit consists of the main drying chamber, a vacuum system, a condensation and solvent-recovery system, a heating system and a control cabinet. It is widely used for heat-sensitive, oxidation-prone and flammable or explosive materials, as well as processes that require solvent recovery. Key features: low-temperature drying that preserves material activity, a sealed environment that prevents oxidation, a high solvent-recovery rate and high thermal efficiency.
2. Working Principle
Wet material is charged into the dryer and the vacuum system evacuates the chamber; the heating system supplies a heating medium (steam, hot water or thermal oil) to the drying trays, jacket or internal heating coils; under vacuum and heating, the moisture or solvent within the material vaporizes rapidly at low temperature; the vapor is drawn off by the vacuum pump and condensed to liquid in the condenser for recovery, while non-condensable gases are vented.
3. System Classification
By operation and construction:
Static vacuum dryer: material rests on heated trays without mechanical agitation — suited to powders, granules and high-purity materials
Dynamic vacuum dryer: fitted with an agitator or rotating shell to keep the material turning over — suited to pastes, viscous and caking materials
Continuous vacuum dryer: continuous feeding and discharge under vacuum — for large-scale, high-throughput production lines
4. Detailed Technical Parameters
4.1 Common Materials
| Material | Suitable Media | Remarks |
|---|---|---|
| 304 Stainless Steel | General chemicals, food, pharmaceuticals | Corrosion-resistant, smooth surface, easy to clean |
| 316L Stainless Steel | Strongly corrosive solvents, high-purity pharma | Excellent corrosion resistance, GMP compliant |
| Carbon Steel Q235B | Water as solvent, non-corrosive materials | Internal anti-corrosion coating required, low cost |
4.2 Typical Specifications
| Effective Volume (L) | Heating Area (m²) | Vacuum Level | Design Temp | Agitation Power |
|---|---|---|---|---|
| 100～500 | 3～12 | -0.096～-0.099MPa | ≤150℃ | 1.5～4kW (Dynamic) |
| 500～2000 | 12～40 | -0.096～-0.099MPa | ≤150℃ | 4～11kW (Dynamic) |
| 2000～8000 | 40～120 | -0.096～-0.099MPa | ≤150℃ | 11～37kW (Dynamic) |
4.3 Design Conditions & Performance
| Parameter | Specification |
|---|---|
| Vacuum Level | Ultimate vacuum ≤-0.096MPa |
| Heating Source Temp | 50℃～150℃ (depending on heating medium) |
| Solvent Recovery Rate | ≥90% (with high-efficiency condenser) |
| Drying Time | 4～16 hours (depending on material and moisture) |
5. Electrical Parameters
| Region | Voltage | Frequency |
|---|---|---|
| China/Russia/Central Asia | 380V | 50Hz |
| Middle East/Southeast Asia/Africa | 400V / 415V | 50Hz |
| South Korea | 380V | 60Hz |
| Americas (if required) | 440V / 480V | 60Hz |
| Note: Voltage and frequency must be specified for the agitator and vacuum pump motors; explosion-proof motors are required for hazardous areas. |
6. Core Component Selection
| Component | Brand/Material | Features & Applications |
|---|---|---|
| Drying Chamber | Fabricated in-house | 304/316L, polished interior, no dead corners |
| Vacuum Pump | Leybold/Pfeiffer/Domestic | Dry screw, water-ring or Roots pumps, selected according to the solvent |
| Condenser | Fabricated in-house | Shell-and-tube or coil type for efficient solvent condensation |
| Mechanical Seal | Matched to order | Double cartridge seal to prevent air or oil ingress |
7. Typical Application Fields
Pharmaceutical: low-temperature drying of APIs and herbal extracts
Chemical: organic solvent recovery and slurry drying
Food: drying of nutraceutical extracts and heat-sensitive proteins
Electronics: drying of battery materials and electrode sheets
8. Design Standards & Certifications
| Standard | Description |
|---|---|
| GB 150-2011 | Pressure vessels (applicable to vacuum and jacket design) |
| ISO 9001:2015 | Quality Management System |
| GMP | Good Manufacturing Practice (for pharma grade) |
| CE / EAC / GOST-R | Available upon request for international orders |
9. Custom Optional Configurations
| Option | Details |
|---|---|
| Structural Type | Static tray / Dynamic agitation / Continuous |
| Heating Method | Steam / Hot water / Thermal oil / Electric |
| Vacuum System | Water ring + Roots pump / Dry screw pump + Condenser |
| Special Designs | CIP online cleaning / SIP online sterilization / N2 protection / Explosion-proof |
10. Warranty Terms
| Equipment Status | Warranty Period | Warranty Scope |
|---|---|---|
| Brand New | 12 months | Chamber & jacket, agitation/sealing system, vacuum system |
| Refurbished | 6 months | Chamber & jacket, agitation/sealing system, vacuum system |
| Idle | 3 months | Main functional components |
11. Packaging & Delivery
| Item | Packaging Method |
|---|---|
| Main Unit / Frame | Bundled with steel straps (nude) or tarpaulin-wrapped |
| Pumps / Valves / Electrical | Fully enclosed wooden cases |
| Wear parts / Seals | Waterproof sealed packaging in wooden cases |
| Container or bulk shipping. On-site installation and commissioning guidance available. |
12. Information Required for Inquiry
12. Information Required for Quotation Please provide: material name and initial/final moisture content; material form (powder, paste or block) and viscosity; processing capacity; solvent type and boiling point (if recovery is required); maximum drying temperature; explosion-proof requirements; preferred equipment condition (new, refurbished or idle); delivery terms (FOB/CIF/DDP); and destination port.