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Disodium hydroxyethylidene diphosphonate HEDP·Na₂
Disodium hydroxyethylidene diphosphonate HEDP·Na₂
Disodium hydroxyethylidene diphosphonate HEDP·Na₂
Disodium hydroxyethylidene diphosphonate HEDP·Na₂

Disodium hydroxyethylidene diphosphonate HEDP·Na₂

Category:

Organophosphorus scale and corrosion inhibitor chelating agent

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Keywords:

Organophosphorus scale and corrosion inhibitor chelating agent

Detailed introduction

Disodium Salt of 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid ( HEDP·Na ₂ )

Alternative names: Disodium hydroxyethylidene diphosphonate, Sodium etidronate 、 CubleK2012 Solid

CAS No.7414-83-7

Molecular formula: C₂H₆O₇P₂Na₂

Relative molecular mass: 250

Structural formula:

Performance and Applications:

HEDP·Na₂ It is an organic phosphonic acid-based scale inhibitor and corrosion inhibitor that can form stable complexes with various metal ions, such as iron, copper, and zinc, and can dissolve oxides on metal surfaces. HEDP·Na₂ In 250℃ It can still effectively inhibit corrosion and scale formation under conditions of high… pH It remains highly stable under normal conditions, is resistant to hydrolysis, and generally does not decompose under typical light or thermal exposure. Its resistance to acids and alkalis, as well as its chlorine‑oxidation stability, is superior to that of other organic phosphonic acids (salts). It can form six-membered chelate rings with metal ions in water, particularly calcium ions, thereby delivering excellent scale‑inhibition performance and exhibiting a pronounced solubility‑limit effect. When used in combination with other water‑treatment agents, it demonstrates an ideal synergistic effect.

HEDP·Na₂ It is widely used for scale inhibition and corrosion control in industrial circulating cooling water systems—such as those in the power, chemical, metallurgical, and fertilizer industries—as well as in medium- and low-pressure boilers, oilfield water injection systems, and oil pipelines.

HEDP·Na₂ In the light‑textile industry, it can serve as a cleaning agent for both metallic and nonmetallic materials; in the dyeing and bleaching industries, it functions as a peroxide stabilizer and a color‑fixing agent; and in cyanide‑free electroplating, it acts as a complexing agent.

Technical Indicators:

Project

Indicator

——

Compliant with HG/T 2839-2010

Appearance

Colorless to slightly yellow transparent liquid

White solid powder

Active ingredient (Expressed as HEDP)%

≥16.5

74.0-79.0

Active ingredient (in the form of HEDP·Na) 2 Accounting )%

≥20.0

89.8-95.8

Iron (in terms of Fe 2+ ) Content mg/L

——

≤20.0

Density (20℃) g/cm 3

1.12-1.22

——

pH (1% aqueous solution)

4.0-6.0

4.0-6.0

 

Instructions for use:

HEDP·Na₂ Typical usage concentration as a scale inhibitor 2 ~ 20mg/L , the typical concentration used as a corrosion inhibitor is 20 ~ 100mg/L , the typical concentration used as a cleaning agent is 1000 ~ 2000mg/L , typically used in conjunction with polycarboxylate scale inhibitors and dispersants.

Packaging and Storage:

HEDP·Na₂ Liquid is packaged in plastic drums, with each drum… 25kg or 250kg , or determined according to user requirements. HEDP•Na2 Solids are packaged in polyethylene-lined plastic woven bags, with a net weight per bag of… 25kg , or as determined by user requirements. Store in a cool, indoor location; the shelf life is twelve months for the solid form and twelve months for the liquid form.

Security Protection:

HEDP·Na₂ It is weakly acidic; observe appropriate personal protective measures during handling, and avoid contact with skin, eyes, etc. If contact occurs, rinse thoroughly with plenty of water.

Application scenarios

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