Pharmaceutical Industry
Organic solvent-containing pharmaceutical materials, pharmaceutical intermediates and biochemical materials.
Product Overview
Closed-Loop Fluid Bed Dryer and Cooler with Solvent Recovery
Controlled-atmosphere drying and solvent recovery for pharmaceutical, biochemical and chemical materials. Designed and manufactured for solvent-containing materials requiring controlled-atmosphere drying and solvent recovery in pharmaceutical applications. Review the working principle, performance features and available configuration details below when specifying your industrial project.
- Closed-loop nitrogen circulation limits contact between solvent-containing process gas and the external environment.
- Fluidized gas-to-particle contact supports intensive heat and mass transfer during drying.
- Evaporated solvent is condensed and recovered before the circulating nitrogen is reheated and returned to the dryer.
- Drying medium
- Nitrogen
- Capacity
- 5–320 kg/h
- Recovery rate
- 95–99%
- Inlet temperature
- Room temperature–300°C
Product Essentials
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Applications
Solvent-containing materials requiring controlled-atmosphere drying and solvent recovery.
Applications include solvent-containing materials requiring controlled-atmosphere drying and solvent recovery in pharmaceutical applications. Confirm material properties and process conditions before selecting the equipment configuration.
Chemical Industry
Solvent-based chemical materials, fine chemical products and organic compounds.
Biological Industry
Biological materials requiring controlled-atmosphere drying.
Suitable Material Types
Granular materials, wet mixed particles, powder-containing materials and materials containing organic solvents.
Working Principle
Sealed nitrogen circulation with solvent condensation and gas recycling.
The nitrogen drying medium transfers heat to the fluidized material, carries evaporated solvent to the recovery section and returns to the heater after condensation.
Closed-Loop Nitrogen Circulation
Heated nitrogen enters the sealed fluidized-bed chamber and transfers heat to the material without direct contact with ambient air.
Fluidized Drying Process
Hot circulating nitrogen contacts the material while solvents such as ethanol, acetone or methanol evaporate into the gas stream.
Dust Separation & Solvent Recovery
Fine particles are removed before solvent vapor enters the condenser, where it is cooled, condensed and recovered.
Gas Reheating & Recycling
After condensation and separation, the nitrogen returns to the heating system and circulates back into the dryer.
Process Flow
Closed-loop material drying, solvent recovery and nitrogen recirculation.
The process maintains a sealed gas route from nitrogen heating through condensation and return heating.
Material Feeding
Solvent-containing material is introduced into the closed fluidized-bed system.
Nitrogen Heating
Circulating nitrogen is heated to the required process temperature.
Closed-Loop Fluidized Drying
Heated nitrogen fluidizes the material and provides drying energy.
Solvent Evaporation
Organic solvent evaporates from the material into the circulating gas.
Dust Separation
Entrained product fines are removed from the solvent-containing gas.
Solvent Condensation Recovery
The condenser cools solvent vapor for collection and reuse.
Nitrogen Reheating
Separated nitrogen returns to the heater.
Continuous Circulation
The reheated gas re-enters the dryer to complete the closed loop.
Key Features
Controlled solvent drying with nitrogen protection and recovery.
Final performance and safety configuration depend on the solvent system, material properties and site requirements.
Closed-Loop Safe Operation
The enclosed structure limits direct contact between solvent-containing process gas and the external environment.
Solvent Recovery
Evaporated solvent is condensed and recovered during circulation, supporting reuse and reduced emissions.
Nitrogen Protection
Nitrogen provides a controlled atmosphere for oxygen-sensitive materials and solvent-processing duties.
High Drying Efficiency
Fluidized gas-to-particle contact supports intensive heat and mass transfer.
Energy Saving & Low Emission
Closed gas circulation reduces heat loss and limits solvent discharge from the process.
Automated Safety Control
The configured control system can monitor oxygen concentration, pressure balance, nitrogen supply and circulation conditions.
Safety Design
Monitoring and protective measures for closed-loop solvent processing.
Safety setpoints, instruments and protection levels are confirmed for the solvent, process conditions and applicable project requirements.
Oxygen Monitoring & Control
Online oxygen monitoring supports automatic adjustment of nitrogen supply when oxygen concentration exceeds the configured safety limit.
Pressure Protection
Pressure-balance monitoring and relief protection respond to abnormal pressure conditions within the circulation system.
Explosion Protection
Explosion-proof electrical and protective provisions reduce risks associated with faults or abnormal operating conditions.
Technical Specifications
Technical specifications
Listed values apply to the identified configuration. Confirm material conditions, utilities and optional equipment before selection.
| Model | Drying Capacity (kg/h) | Bed Area (m²) | Fan Power (kW) | Inlet Air Temperature (°C) | Heat Transfer Medium | Solvent Recovery Rate (%) |
|---|---|---|---|---|---|---|
| Model 1 | 5–20 | 0.25 | 7.5 | Room Temperature–300 | Nitrogen | 95–99 |
| Model 2 | 10–40 | 0.5 | 11 | Room Temperature–300 | Nitrogen | 95–99 |
| Model 3 | 20–80 | 1 | 15 | Room Temperature–300 | Nitrogen | 95–99 |
| Model 4 | 40–160 | 2 | 30 | Room Temperature–300 | Nitrogen | 95–99 |
| Model 5 | 60–240 | 3 | 75 | Room Temperature–300 | Nitrogen | 95–99 |
| Model 6 | 80–320 | 4 | 90 | Room Temperature–300 | Nitrogen | 95–99 |
| Parameter | Specification |
|---|---|
| Drying Medium | Nitrogen |
| System Type | Closed-Loop Circulation |
| Application | Solvent-containing material drying |
| Solvent Recovery Rate | 95–99% |
| Inlet Temperature Range | Room Temperature–300°C |
| Operation Mode | Continuous circulation |
| Safety Features | Oxygen monitoring, pressure protection and explosion protection |
Selection Support
Information required for dryer equipment selection.
Provide the following solvent, material, production and safety data for preliminary sizing and configuration review.
Material nameSolvent typeSolvent contentMaterial formProcessing capacityInitial moisture / solvent contentRequired final solvent contentRequired recovery rateHeat sensitivityOxygen sensitivityRequired production capacitySafety requirementsAutomation requirements
