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1-Hydroxyethylidene-1,1-diphosphonic acid CAS#2809-21-4

1-Hydroxyethylidene-1,1-diphosphonic acid CAS#2809-21-4 Promotion Season Now in Store and Free Sample for Testing with Factory Price

Chemical Name：1-Hydroxyethylidene-1,1-diphosphonic acid

CAS No.:2809-21-4

Molecular Formula：C2H8O7P2

Molecular weight:206.03

Sample: Available

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Product Details

Products Description of 1-Hydroxyethylidene-1,1-diphosphonic acid CAS#2809-21-4

Hydroxyethylidene diphosphonic acid, also known as HEDP, is a diphosphate compound used in detergents, water purification processes, cosmetics and pharmaceutical production. The chemical formula of the salt produced by this acid is MnHEDP (M is a cation and n is the number of M, up to 4).

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1-Hydroxyethylidene-1,1-diphosphonic acid Chemical Properties

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)
form	Powder
pka	1.35, 2.87, 7.03, 11.3(at 25℃)
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

Product Application of 1-Hydroxyethylidene-1,1-diphosphonic acid CAS#2809-21-4

Hydroxyethylidene diphosphonic acid (HEDP) is a new type of chlorine-free electroplating complexing agent. It is used as the main agent for water quality stabilization in the circulating cooling water system and plays a role in corrosion and scale inhibition. This product is one of the organic polyphosphonic acid water treatment agents. There are some other varieties of this type of products produced domestically, such as aminotrimethylenephosphonic acid (ATMP): [CH2PO(OH)2]3N and ethylenediaminetetramethylenephosphonic acid (EDTMP), etc. Organic polyphosphonic acid is a type of water treatment agent developed in the late 1960s and confirmed around the 1970s. The emergence of this type of treatment agent has made a big step forward in water treatment technology. Compared with organic polyphosphates, organic polyphosphonic acid has the characteristics of good chemical stability, not easy to hydrolyze, high temperature resistance, small dosage, and corrosion mitigation performance. It is a type of cathodic corrosion inhibitor and a type of non-chemical equivalent scale inhibitor; when used in combination with other water treatment agents, it shows an ideal synergistic effect. It has excellent chelating ability for many metal ions such as calcium, magnesium, copper, zinc, etc., and even has a good deactivation effect on inorganic salts of these metals such as CaSO4, CaCO3, MgSiO3, etc., so it is widely used in water treatment technology.

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