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 specialized organophosphoric acid that serves as an effective scale and corrosion inhibitor. Widely used in industrial water treatment systems, HEDP is renowned for its ability to chelate with metal ions such as iron, copper, and zinc, forming stable complexes that prevent oxidation and scaling. This article explores the properties, technical specifications, applications, and the company behind this critical chemical—Hebei Longke Water Treatment Co., Ltd..

Key Features and Advantages

HEDP's unique molecular structure allows it to exhibit exceptional performance in high-temperature and high-pH environments. According to the National Institute of Standards and Technology (NIST), NIST research highlights the importance of chemical stability in industrial applications, a domain where HEDP excels. Its resistance to hydrolysis and decomposition under normal conditions ensures long-term efficacy in water treatment systems. Additionally, HEDP's compatibility with other water treatment chemicals, such as polycarboxylic acids, enhances its synergistic effects in scale and corrosion control.

Chemical Stability and Performance

HEDP maintains its integrity at temperatures up to 250°C and demonstrates superior acid/alkali and chlorine oxidation resistance compared to traditional organophosphoric acids. This makes it ideal for use in circulating cooling systems, oil fields, and low-pressure boilers. The NIST emphasizes the importance of such stability in industrial processes, as highlighted in their guidelines on chemical safety and performance standards.

Applications Across Industries

HEDP's versatility extends to multiple sectors, including power generation, chemical manufacturing, metallurgy, and textile processing. In the textile industry, it acts as a detergent for both metal and non-metal surfaces, while in dyeing processes, it functions as a peroxide stabilizer and dye-fixing agent. For non-cyanide electroplating, HEDP serves as a chelating agent, ensuring uniform coating and reducing defects.

Technical Specifications

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	-

Usage Guidelines

The optimal dosage of HEDP varies depending on the application. As a scale inhibitor, it is typically used at 1-10 mg/L, while corrosion inhibition requires 10-50 mg/L. For detergent purposes, concentrations of 1000-2000 mg/L are recommended. HEDP is often combined with polycarboxylic acids to enhance its effectiveness. Hebei Longke Water Treatment Co., Ltd. provides detailed technical support to ensure proper implementation.

Packaging and Storage

• Liquid HEDP: 200L plastic drums, IBC (1000L), or customer-specific requirements.
• Solid HEDP: 25kg/bag, with customization available.
• Storage: 12 months in a shaded, dry environment.

Safety and Protection

HEDP is acidic and requires careful handling. Users should wear protective gear to avoid contact with eyes and skin. In case of spills, rinse the affected area with plenty of water immediately. NIST guidelines emphasize the importance of chemical safety protocols to minimize risks in industrial settings.

Company Background

Hebei Longke Water Treatment Co., Ltd. is a leading manufacturer of water treatment chemicals, specializing in innovative solutions for industrial and environmental applications. With a commitment to quality and sustainability, the company adheres to strict international standards, ensuring its products meet the demands of modern industries. Visit the company's official website to learn more about their comprehensive product range and technical expertise.

Conclusion

HEDP stands out as a critical component in water treatment systems due to its exceptional chelating properties, chemical stability, and wide-ranging applications. Its ability to prevent scale and corrosion, combined with its compatibility with other chemicals, makes it an indispensable tool for industries reliant on water-based processes. As highlighted by NIST research, the development of such advanced chemical solutions is vital for maintaining efficiency and safety in industrial operations.

References

National Institute of Standards and Technology (NIST)