1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP)
CAS Number: 2809-21-4
HEDP is a highly effective organophosphonic acid scale and corrosion inhibitor used in industrial cooling water, boiler water, and oilfield water treatment. It inhibits calcium carbonate, calcium sulfate, and zinc scale through threshold inhibition and crystal modification. HEDP is stable in oxidizing environments and demonstrates strong chelation of metal ions including iron and copper.
Technical Specifications
| density | 1.40–1.45 g/cm³ |
| chloride | ≤1% |
| appearance | Colorless to light yellow liquid |
| ironContent | ≤15 ppm |
| activeContent | ≥60% |
| pH (1% solution) | 2.0 |
Applications
- Industrial cooling water treatment
- Boiler water scale prevention
- Oilfield produced water treatment
- Metal surface cleaning and pickling
- Textile and paper industry water treatment
Key Features
- Excellent stability in chlorine-containing water systems
- Threshold inhibition of multiple scale types
- Strong corrosion inhibition for carbon steel and copper
- Good thermal stability and hydrolysis resistance
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CAS Number
2809-21-4
Category
Water Treatment ChemicalsAvailability
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