Etidronic Acid CAS：2809-21-4
HEDP delivers outstanding performance in maintaining water quality. It acts as a high-efficiency antiscalant and corrosion inhibitor for circulating cooling water systems, effectively sustaining stable water quality over a long period.
Free from chlorine ingredients, HEDP serves as a chelating agent with eco-friendly properties. It works as a sustainable replacement for traditional water treatment chemicals in environmental protection applications.
This chemical product features excellent thermal and chemical stability. It is not easy to degrade under normal operating environments, thus maintaining stable and long-lasting treatment effectiveness.
Hydroxyethylidene diphosphonic acid (HEDP), namely Etidronic Acid, is a high-efficiency chlorine-free complexing agent widely applied in electroplating and water treatment. It can effectively inhibit scale deposition and metal corrosion in circulating cooling water systems to maintain stable water quality, and is categorized as an organic phosphonic acid water treatment chemical.
Common similar domestic products of this kind include aminotrimethylenephosphonic acid (ATMP, molecular structure: [CH2PO(OH)2]3N) and ethylenediaminetetramethylenephosphonic acid (EDTMP). Organic polyphosphonic acids emerged as a new type of water treatment agent in the late 1960s and were widely promoted and applied in industrial scenarios in the 1970s.
Basic Properties of Etidronic Acid
| Item | Specification |
|---|---|
| Melting point | 198~199℃ |
| Boiling point | 578.8±60.0℃ (Predicted) |
| Density | 1.45 (60% aqueous solution) |
| Vapor pressure | 0 Pa at 25℃ |
| Storage condition | Sealed, dry and room temperature |
| Solubility | Slightly soluble in methanol and water |
| pKa (25℃) | 1.35, 2.87, 7.03, 11.3 |
| Form | White powder |
| pH value | 1.3～1.8 (25℃) |
| Stability | Stable; incompatible with strong oxidants |
| CAS No. | 2809-21-4 |
| LogP | -3.5 |
Safety & Toxicity Information
Mouse oral LD50: 1800 mg/kg.
