Etidronic acid

Corrosion and Scale Inhibitor

WTA-028

2809-21-4

Etidronic acid

WTA-028

Phosphonic acid, P,P'-(1-hydroxyethylidene)bis-; P,P'-(1-Hydroxyethylidene)bis[phosphonic acid]; (1-Hydroxyethylidene)-1,1-bis(phosphonic acid); (1-Hydroxyethylidene)-1,1-diphosphonic acid; (1-Hydroxyethylidene)bisphosphonic acid; (1-Hydroxyethylidene)diphosphonic acid; 1-Hydroxy-1,1-diphosphonoethane; 1-Hydroxyethane-1,1-bisphosphonic acid; 1-Hydroxyethane-1,1-diphosphonic acid; 1-Hydroxyethane-1,1-diyldiphosphonic acid; 1-Hydroxyethane-1,2-diphosphonic acid; 1-Hydroxyethanediphosphonic acid; 1-Hydroxyethyl-1,1-diphosphoric acid; 1-Hydroxyethylidene-1,1-diphoshonic acid; 1-Hydroxyethylidene-1,1-diphosphoric acid; 1-Hydroxyethylidene-1,1'-diphosphonic acid; Acetodiphosphonic acid; Briquest ADPA-A; EHDP; Ethane-1-hydroxy-1,1-diphosphonic acid; Ethidronate; Ethydronate; Etidronate; H 501 (corrosion inhibitor); HDEPA; HEDP; Hydroxyethanediphosphonic acid; Ksidifon; NSC 227995; OEDF; OEDFK; OEDP; Oxyethylidenediphosphonic acid; Wayplex; Xidifon; Xidiphone; Xydiphone

(1-hydroxy-1-phosphonoethyl)phosphonic acid

206.02

C2H8O7P2

CC(O)(P(=O)(O)O)P(=O)(O)O

InChI=1S/C2H8O7P2/c1-2(3,10(4,5)6)11(7,8)9/h3H,1H3,(H2,4,5,6)(H2,7,8,9)

DBVJJBKOTRCVKF-UHFFFAOYSA-N

578.8±60.0°C at 760 mmHg

155°C (dec.)

303.8°C

≥95%

2.114±0.06 g/cm3

220-552-8

HEDP is a kind of scale and corrosion inhibitor which belongs to organic phosphonic acid. It can form stable complexes with iron, copper, zinc and other metal ions, and can also dissolve the metal surface oxide. Under 250 °C condition, HEDP can still play a good corrosion and scale inhibition effect. HEDP has good chemical stability under high pH value, hard to be hydrolyzed, and hard to be decomposed under ordinary light and heat conditions. Its acid/alkali and chlorine oxidation tolerance show better than that of other organic phosphonic acid (salt) acids (salt). HEDP can react with metal ions in water system to form hexa-element chelating complex, especially with calcium ions. Therefore, HEDP has good anti-scale and visible threshold effects. When used in combination with other water treatment chemicals, it shows ideal synergistic effects. HEDP solid state is a high purity product, suitable for cold winter areas; Because of its high purity, it is especially used as the cleaning agents in electronics industry, and additives in daily chemicals.

Store at 2-8°C

Soluble in Methanol (Slightly), Water (Slightly)

2.0 max

Chelating agents

White Solid

Etidronic acid is widely used as a scale and corrosion inhibitor in industrial circulating cooling water systems of electric power, chemical industry, metallurgy, chemical fertilizer, and also in medium or low-pressure boilers, oilfield water injection, and oil pipeline. HEDP can also be used as a cleaning agent of metal and nonmetal in the textile industry, as a peroxide stabilizer and fixing agent in the bleaching and dyeing industry, as a complexing agent in the cyanide-free electroplating industry, as the carrier of radioactive elements in the pharmaceutical industry, and so on.

-0.99220

Stable. Incompatible with strong oxidizing agents.

Acidity. Avoid contact with eye and skin, once contacted, flush with water.

154.91

10.0 max

60.0 min

0. 6 max

UN 3265 8/PG III