1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP) - Hebei Longke Water Treatment Co., Ltd.

CAS No. 2809-21-4 | Molecular Formula: C₂H₈O₇P₂ | Molecular Weight: 206.02

Introduction

1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP) is a multifunctional organophosphonic acid compound renowned for its exceptional performance as a scale and corrosion inhibitor. Widely utilized in industrial water treatment systems, HEDP is a critical component in maintaining the efficiency and longevity of equipment in sectors such as power generation, chemical processing, metallurgy, and more. This article provides an in-depth exploration of HEDP's properties, technical specifications, applications, and the company behind its production.

Key Properties of HEDP

HEDP is a corrosion scale inhibitor that exhibits remarkable versatility in industrial applications. Its ability to chelate with metal ions such as Fe, Cu, and Zn allows it to form stable complexes, effectively dissolving oxidized materials on metal surfaces. This property makes HEDP particularly effective in preventing scale formation and corrosion under high-temperature conditions (up to 250°C). Additionally, HEDP demonstrates superior chemical stability under high pH values, resisting hydrolysis and decomposition under normal light and heat conditions.

One of HEDP's standout features is its compatibility with other water treatment chemicals. When combined with polycarboxylic acids, it exhibits synergistic effects, enhancing its scale and corrosion inhibition capabilities. HEDP's acid/alkali and chlorine oxidation resistance also surpasses that of other organophosphoric acids, making it a preferred choice in challenging environments.

The solid form of HEDP is a white crystalline powder, ideal for use in cold climates. Its high purity allows it to serve as a cleaning agent in the electronics industry and as an additive in daily chemicals.

Technical Specifications

The following table outlines the technical specifications of HEDP in both liquid and solid forms:

Items	Index (Liquid)	Index (Solid)
Appearance	Clear, Colorless to pale yellow aqueous solution	White crystal powder
Active content (HEDP), %	58-62	90.0 min
Active content (HEDP·H2O), %	-	98.0 min
Phosphorous acid (as PO33-), %	2.0 max	0.8 max
Phosphoric acid (as PO43-), %	0.8 max	0.5 max
Chloride (as Cl-), %	0.02 max	0.01 max
pH (1% water solution)	2.0 max	2.0 max
Density (20℃), g/cm3	1.40 min	-
Fe, mg/L	20.0 max	10.0 max
Color APHA (Hazen)	40.0 max	-
Ca Sequestration (mg CaCO3/g)	500.0 min	-

Applications of HEDP

HEDP is a critical additive in various industrial processes. Its primary applications include:

• Water Treatment Systems: HEDP is used in circulating cooling water systems, oil fields, and low-pressure boilers to prevent scale and corrosion. It is typically applied at dosages of 1-10 mg/L for scale inhibition and 10-50 mg/L for corrosion control.
• Textile Industry: In light woven industries, HEDP acts as a detergent for both metal and non-metal surfaces.
• Dyeing Industry: HEDP functions as a peroxide stabilizer and dye-fixing agent.
• Electroplating: In non-cyanide electroplating, HEDP serves as a chelating agent.
• Industrial Cleaning: At higher concentrations (1000-2000 mg/L), HEDP is used as a detergent.

For more information on HEDP's applications, visit the product page.

Packaging and Storage

HEDP is available in both liquid and solid forms:

• Liquid: 200L plastic drums, IBC (1000L), or as per customer requirements.
• Solid: 25kg/bag, customizable to meet specific needs.

Storage conditions: HEDP should be kept in a shaded, dry place for up to 12 months.

Safety and Protection

HEDP is acidic, so proper safety measures are essential during handling. Avoid contact with eyes and skin. In case of accidental exposure, rinse thoroughly with water. Always follow the NIST guidelines for chemical safety protocols.

Synonyms and Related Products

HEDP is known by multiple names, including:

• Etidronic Acid
• Hydroxyethylidene-1,1-diphosphonic acid
• Oxyethylidenediphosphonic Acid (OEDP)
• 1-Hydroxy-1,1-Ethanediyl ester

Related products include 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid, which shares similar properties and applications.

About Hebei Longke Water Treatment Co., Ltd.

Hebei Longke Water Treatment Co., Ltd. (河北隆科水处理股份有限公司) is a leading manufacturer of water treatment chemicals, including HEDP. With a commitment to innovation and quality, the company provides solutions for industrial water treatment, corrosion control, and scale inhibition. Their products are trusted in sectors such as power generation, chemical processing, and metallurgy.

For more information about the company, visit Hebei Longke's official website.

Conclusion

HEDP is an indispensable compound in modern industrial processes, offering robust protection against corrosion and scale formation. Its versatility, chemical stability, and compatibility with other treatment agents make it a preferred choice for industries worldwide. Hebei Longke Water Treatment Co., Ltd. continues to lead in the development and supply of high-quality HEDP products, ensuring optimal performance in diverse applications.

References

1. National Institute of Standards and Technology (NIST) – Provides guidelines for chemical safety and measurement standards.