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Sodium hydroxyethylidene diphosphonate HEDP·Na
Sodium hydroxyethylidene diphosphonate HEDP·Na
Sodium hydroxyethylidene diphosphonate HEDP·Na
Sodium hydroxyethylidene diphosphonate HEDP·Na

Sodium hydroxyethylidene diphosphonate HEDP·Na

Category:

Organophosphorus scale and corrosion inhibitor chelating agent

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Keywords:

Organophosphorus scale and corrosion inhibitor chelating agent

Detailed introduction

Mono-sodium of 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid ( HEDP·Na )

Alternative name: Sodium hydroxyethylidene diphosphonic acid

CAS No.29329-71-3

Molecular formula: C₂H₇O₇P₂Na                              

Relative molecular mass: 228

Structural formula:

Performance and Applications:

HEDP•Na 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. 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, are superior to those 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 a pronounced solubility‑limit effect. When used in combination with other water‑treatment agents, it exhibits an ideal synergistic effect.

HEDP•Na Scale inhibitors and detergents suitable for acidic formulations; HEDP•Na It is the monosodium salt of hydroxyethylidene diphosphonic acid and is suitable for applications such as metal cleaning, metal treatment, and metal ion control.

HEDP•Na It is widely used for scale inhibition and corrosion protection 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•Na In the light‑textile industry, it can serve as a cleaning agent for both metallic and nonmetallic materials; in the dyeing and bleaching industry, it functions as a peroxide stabilizer and a color‑fixing agent; and in the cyanide‑free electroplating industry, it acts as a complexing agent.

Technical Indicators:

Project

Indicator

Appearance

Colorless to slightly yellow transparent liquid

Active ingredient (Expressed as HEDP)%

19.0-21.0

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

≤20.0

Density (20℃) g/cm 3

1.11-1.21

pH (1% aqueous solution)

2.3-2.9

 

Instructions for use:

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

Packaging and Storage:

HEDP·Na Packaged in plastic drums, each drum 25kg or 250kg , or as determined according to user requirements. Store in a cool, indoor location; shelf life is twelve months.

Security Protection:

HEDP·Na It is 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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