Etidronic Acid
Etidronic Acid CAS# 2809-21-4
Hydroxyethylidene diphosphonic acid (HEDP) is a novel chlorine-free electroplating complexing agent. It serves as the primary agent for water quality stabilization in circulating cooling water systems, delivering both corrosion inhibition and scale prevention effects.Classified as one of the organic polyphosphonic acid-free water treatment conditioners, this compound has several domestic counterparts. Examples include aminotrimethylenephosphonic acid (ATMP), with the chemical formula [CH₂PO(OH)₂]₃N, and ethylenediaminetetramethylenephosphonic acid (EDTMP).Organic polyphosphonic acids emerged as a category of water treatment agents in the late 1960s, with their efficacy and applicability formally confirmed in the 1970s.
Etidronic Acid Chemical Parameters
Melting point | 198~199℃ |
Boiling point | 578.8±60.0 °C(Predicted) |
density | 1.45 (60% aq.) |
vapor pressure | 0Pa at 25℃ |
storage temp. | Sealed in dry,Room Temperature |
solubility | Methanol (Slightly), Water (Slightly) |
pka | 1.35, 2.87, 7.03, 11.3(at 25℃) |
form | Powder |
color | white |
PH | pH (1.7→100, 25℃) : 1.3～1.8 |
Water Solubility | Soluble in water. |
Merck | 14,3863 |
BRN | 1789291 |
Stability: | Stable. Incompatible with strong oxidizing agents. |
InChIKey | DBVJJBKOTRCVKF-UHFFFAOYSA-N |
LogP | -3.5 |
CAS DataBase Reference | 2809-21-4(CAS DataBase Reference) |
EPA Substance Registry System | Etidronic acid (2809-21-4) |
Safety Information
Hazard Codes | Xi,Xn |
Risk Statements | 37/38-41-22 |
Safety Statements | 26-39 |
RIDADR | UN 3265 |
WGK Germany | 2 |
RTECS | SZ8562100 |
F | 10 |
TSCA | Yes |
HazardClass | 8 |
PackingGroup | II |
HS Code | 29319090 |
Hazardous Substances Data | 2809-21-4(Hazardous Substances Data) |
Toxicity | LD50 oral in mouse: 1800mg/kg |
Etidronic Acid CAS# 2809-21-4 Application
1-Hydroxyethylidenebis(phosphonic acid) functions as an inhibitor of human protein tyrosine phosphatase and holds utility in photographic processes. It is employed clinically to enhance bone strength, treat osteoporosis, and manage Paget's disease of bone.Beyond medical applications, it serves as a corrosion inhibitor in circulating cooling water systems, oil fields, and low-pressure boilers across sectors like electric power, chemical engineering, metallurgy, and fertilizer production. It is also incorporated into the formulation of anti-scaling agents for reverse osmosis and thermal desalination systems.Additionally, this compound finds use in detergents, water treatment products, cosmetics, and pharmaceutical formulations.
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