Pneumatic conveying system for hygroscopic powder
Transferring hygroscopic materials – Pneumatic conveying system for hygroscopic powder – (materials that readily absorb moisture from the air) using a pneumatic transfer system requires special considerations to prevent clumping, degradation, or blockages due to moisture. Here’s how to effectively transfer them:
✅ Recommended System: Vacuum Pneumatic Conveying (Closed Loop)
Pneumatic conveying system for hygroscopic powder –
Why? Vacuum systems minimize air leaks and can maintain controlled environmental conditions, ideal for hygroscopic materials.
🔧 Key Design Considerations
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Use Dry Air or Nitrogen
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Problem: Ambient air contains moisture, which can be absorbed by the hygroscopic powder.
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Solution: Use dehumidified air or nitrogen (inert gas) as the conveying medium to prevent moisture absorption.
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Closed or Inert Loop System
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A closed-loop vacuum system prevents external air (and moisture) from entering.
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Nitrogen blanketing can be used for highly sensitive materials (e.g., in pharma or specialty chemicals).
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Stainless Steel Construction
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Use SS304/316 for hygienic and corrosion-resistant surfaces.
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Minimal Elbows and Bends
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Reduces the risk of product build-up and sticking in the lines.
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Proper Filter & Receiver Design
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Use HEPA filters and ensure the receiver is properly sealed and purged.
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Use of Air Dryer or Desiccant Dryer
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Install a drying unit in the compressed air line to remove humidity before conveying.
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📊 Typical Pneumatic Transfer Setup for Hygroscopic Materials
➤ System Flow:
Hopper → Vacuum Pump → Transfer Line → Filter Receiver → Discharge to Process Equipment
➤ Options for Sensitive Powders:
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Dense Phase Vacuum System (for fragile and moisture-sensitive powders)
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Low Velocity Conveying to reduce attrition
🧪 Example Hygroscopic Materials:
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Citric Acid
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Calcium Chloride
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Sodium Hydroxide
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Sugar
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Ammonium Nitrate
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Pharmaceutical APIs
🧩 Additional Tips:
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Avoid long conveying distances if possible.
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Purge lines after operation to prevent material sticking.
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Monitor dew point of conveying air to ensure it stays below critical limits.
Pneuconveyor System & Engineers
Vacuum Pneumatic Transfer System for Hygroscopic Materials
📞 Contact: 8169813211 / 8169820763
✉️ Email: pneuconveyor@gmail.com / info@pneuconveyor.com
🌐 Website: https://pneuconveyor.com