ATMP Antisludging Agent – Amino Trimethylene Phosphonic Acid for Water Treatment
HEDP Antisludging Agent – Hydroxyethylidene Diphosphonic Acid for Water Treatment
HEDP is a high-performance phosphonic acid scale inhibitor with outstanding chelating and corrosion inhibition properties. Key features:
- Excellent stability in high-temperature/high-pH systems
- Strong scale inhibition for CaCO₃, CaSO₄, and BaSO₄
- Low phosphorus release (environmentally friendlier)
- Compatible with oxidizing biocides
Widely used in cooling water, oilfields, and RO systems.
| Chemical Name | Hydroxyethylidene Diphosphonic Acid |
| CAS No. | 2809-21-4 |
| Appearance | Colorless to pale yellow liquid |
SPECIFICATION
Key Advantages
- Superior Scale Inhibition:
- Effective against CaCO₃, CaSO₄, BaSO₄, and iron deposits
- Threshold inhibition (works at sub-stoichiometric doses)
- Corrosion Protection:
- Forms stable protective film on carbon steel & copper
- Synergistic with zinc ions for enhanced performance
- High-Temperature Stability:
- Maintains efficacy up to 220°C (428°F)
- Resistant to chlorine/oxidizers (≤10 ppm residual Cl₂)
Applications
- Cooling Water Systems:
- Open/closed recirculating systems
- Effective dosage: 5-30 ppm
- Oilfield Applications:
- Squeeze treatments for scale control
- Compatible with brines (≤25% salinity)
- RO & Desalination:
- Prevents membrane scaling
- Works at pH 2-10
Dosing Guidelines
- Cooling Water: 10-50 ppm (adjust per LSI)
- Boiler Water: 5-20 ppm + oxygen scavenger
- Oilfield: 50-500 ppm in squeeze treatments
Safety & Handling
- Corrosive – use PPE (gloves, goggles)
- LD50 (rat, oral): 1,870 mg/kg
- Biodegradability: ~20% (OECD 301B)
- Store in HDPE/PP containers (avoid carbon steel)
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