Typical process applications
- Organic-solvent-based slurry drying
- Oxidation-sensitive material drying
- Solvent recovery processes
- Flammable or potentially hazardous solvent systems
- Powder production under an inert atmosphere
Product Overview
Closed-Loop Centrifugal Spray Dryer with Solvent Recovery
Closed-loop centrifugal spray drying with inert-gas circulation and solvent recovery for organic-solvent-based and oxidation-sensitive feeds. Designed and manufactured for typical process applications and typical industries. Review the working principle, performance features and available configuration details below when specifying your industrial project.
The system operates in a closed circuit using nitrogen or another suitable inert gas as the drying medium. Liquid feed is atomized by a high-speed centrifugal atomizer and dried inside the drying chamber.
The evaporated solvent is subsequently condensed and recovered, while the inert gas is reheated and continuously recirculated through the system.
Compared with conventional open-cycle spray drying, the closed-loop process reduces material exposure to oxygen and allows organic solvents to be recovered rather than continuously discharged with the exhaust gas.
- Closed inert-gas circulation protects oxygen-sensitive materials during drying.
- Integrated condensation supports recovery of evaporated organic solvents.
- Process and electrical protection are configured for the solvent and project conditions.
- Drying medium
- Nitrogen / inert gas
- Atomization
- Centrifugal
- System pressure
- Positive pressure
- Recovery
- Solvent condensation
Product Essentials
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- Drying medium
- Nitrogen or another suitable inert gas
- Operating mode
- Closed-loop circulation
- Atomization
- Centrifugal atomization
- System pressure
- Positive pressure
- Solvent recovery
- Condensation recovery
- Reference oxygen
- ≤500 ppm
Applications
Solvent-based and oxygen-sensitive process duties.
The system is particularly suitable for liquid feeds containing organic solvents or materials that require protection from oxidation during drying. Final suitability must be confirmed from material, solvent and hazard data.
Typical industries
- Pharmaceutical
- Chemical
- Food and specialty ingredients
- Lithium battery materials
- Advanced functional materials
Typical solvents
- Ethanol
- Acetone
- Hexane
Working Principle
Closed-loop atomization, drying and solvent recovery.
The drying process takes place in a sealed system using nitrogen or another suitable inert gas as the circulating drying medium.
The inert gas is heated and introduced into the drying chamber. Liquid feed is transferred by a feed pump to the centrifugal atomizer, where it is dispersed into fine droplets.
The droplets contact the heated circulating gas inside the chamber for rapid heat and mass transfer. After drying, the powder is discharged from the lower section of the chamber.
The circulating gas carrying evaporated solvent and entrained fine particles passes through powder separation and dust removal. Solvent vapor is then condensed into liquid and recovered.
The remaining non-condensable inert gas is reheated and returned to the drying chamber, completing the closed circulation loop.
The system operates under controlled positive pressure. When internal pressure falls below the required level, nitrogen supply is automatically adjusted to maintain the pressure balance.
Liquid feed
Transfer the prepared liquid or slurry to the atomization system.
Centrifugal atomization
Disperse the feed into fine droplets at high rotational speed.
Closed-loop drying
Dry the droplets in the heated inert-gas stream.
Powder separation
Separate and discharge dried powder from the gas stream.
Dust removal
Remove entrained fine particles before condensation.
Solvent condensation
Condense evaporated solvent into liquid.
Solvent recovery
Collect the condensed solvent for downstream handling.
Gas reheating
Reheat the non-condensable inert gas.
Inert-gas recirculation
Return the conditioned gas to the drying chamber.
Key Features
Process functions for protected solvent-based powder production.
Final operating conditions, protection measures and performance are confirmed from the feed, solvent and project requirements.
Closed-loop inert atmosphere
Nitrogen or another suitable inert gas is continuously circulated through the system, helping protect oxygen-sensitive materials during processing.
Organic solvent recovery
Evaporated solvent is condensed into liquid after drying, allowing recovery while reducing direct solvent discharge.
High-speed centrifugal atomization
The atomizer converts liquid feed into fine droplets, providing a large surface area for rapid heat and mass transfer.
Positive-pressure operation
Nitrogen replenishment is used to maintain the required pressure balance in the closed drying system.
Low-oxygen process control
The inert-gas circulation system is designed to maintain a low-oxygen environment for solvent-containing and oxidation-sensitive materials.
Powder and dust recovery
Powder separation and downstream dust-removal stages recover entrained particles before solvent condensation.
Explosion-protected design
Electrical and process safety measures are incorporated for applications involving flammable organic solvents.
System Configuration
Main System Configuration
The final equipment scope is selected according to the material, solvent, capacity, recovery target and explosion-protection requirements.
| System Section | Function |
|---|---|
| Feed System | Transfers liquid feed to the atomizer |
| Centrifugal Atomizer | Atomizes liquid feed into fine droplets |
| Gas Heating System | Heats the circulating inert gas |
| Drying Chamber | Provides the main heat and mass transfer zone |
| Powder Collection | Collects dried powder |
| Cyclone Separator | Separates entrained powder from process gas |
| Scrubbing / Dust Removal System | Further removes fine particles |
| Condensation System | Condenses evaporated organic solvent |
| Solvent Recovery System | Collects recovered liquid solvent |
| Circulation Fan | Maintains circulating gas flow |
| Nitrogen Supply System | Maintains the required inert atmosphere |
| Pressure Control System | Maintains system pressure balance |
| Control & Monitoring System | Monitors and controls operating conditions |
Technical Specifications
Technical specifications
Listed values apply to the identified configuration. Confirm material conditions, utilities and optional equipment before selection.
| Parameter | Specification |
|---|---|
| Equipment Type | Closed-Loop Centrifugal Spray Dryer |
| Drying Medium | Nitrogen / Inert Gas |
| Operating Mode | Closed-Loop Circulation |
| Atomization | Centrifugal Atomization |
| System Pressure | Positive Pressure |
| Dry Powder Recovery | ≥95% |
| Residual Solvent in Product | ≤2% |
| System Oxygen Content | ≤500 ppm |
| Electrical Explosion Protection | Ex d IIB T4 |
| Solvent Recovery | Condensation Recovery |
Technical parameters are based on the reference system configuration. Actual performance and explosion-protection requirements shall be confirmed according to the material, solvent, capacity and project conditions.
Selection Support
Information required to evaluate the closed-loop drying system.
Provide the following data for preliminary process, safety and equipment configuration review.
Material nameSolvent typeFeed compositionSolid contentFeed capacityInitial solvent / moisture contentRequired final solvent / moisture contentTarget particle sizeRequired production capacityMaterial sensitivity to oxygenSolvent recovery requirementsFlammability and explosion characteristicsAvailable heating sourceMaterial-contact requirementsAutomation requirementsInstallation conditions
