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 versatile organophosphonic acid compound renowned for its exceptional performance in scale and corrosion inhibition. As a critical component in water treatment systems, HEDP is widely utilized across industries such as power generation, chemical manufacturing, metallurgy, and more. This article provides an in-depth analysis of HEDP's properties, technical specifications, applications, and its role in modern industrial processes.

Key Features and Advantages

HEDP is an organophosphoric acid corrosion inhibitor that forms stable complexes with metal ions like Fe, Cu, and Zn. This unique property allows it to dissolve oxidized materials on metal surfaces, making it an effective solution for corrosion and scale prevention. Its ability to function under high-temperature conditions (up to 250°C) and maintain stability in high-pH environments sets it apart from other organophosphoric acids. Additionally, HEDP exhibits superior resistance to hydrolysis and decomposition under normal light and heat conditions, ensuring long-term reliability.

One of HEDP's standout features is its synergistic effect when combined with other water treatment chemicals. It forms a hexa-element chelating complex with calcium ions, providing excellent scale inhibition and threshold effects. This makes it a preferred choice for industrial water systems where maintaining efficiency and equipment longevity is paramount.

Technical Specifications

The following table outlines the detailed 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°C), 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 and Industries

HEDP is extensively used in various industrial applications, including:

• Circulating Cooling Water Systems: HEDP prevents scale and corrosion in heat exchangers, condensers, and pipelines.
• Oil Fields: It is employed to inhibit scale formation in production and injection wells.
• Low-Pressure Boilers: HEDP ensures efficient operation by preventing mineral deposits.
• Textile Industry: As a detergent for metal and non-metal surfaces, HEDP enhances cleaning processes.
• Dyeing Industry: It acts as a peroxide stabilizer and dye-fixing agent, improving color retention.
• Electroplating: HEDP functions as a chelating agent in non-cyanide electroplating solutions.

The recommended dosages vary depending on the application: 1-10 mg/L for scale inhibition, 10-50 mg/L for corrosion inhibition, and 1000-2000 mg/L for detergent use. HEDP is typically used in conjunction with polycarboxylic acids to enhance its effectiveness.

Company Background: Hebei Longke Water Treatment Co., Ltd.

Hebei Longke Water Treatment Co., Ltd. is a leading manufacturer of water treatment chemicals, specializing in scale and corrosion inhibitors. With a commitment to innovation and quality, the company provides solutions for diverse industrial needs. Their product line includes HEDP, which is produced under strict quality control standards to ensure optimal performance. For more information about their products and services, visit Hebei Longke Water Treatment Co., Ltd..

Safety and Handling

As an acidic compound, HEDP requires careful handling. Users should adhere to safety protocols to avoid contact with eyes and skin. In case of accidental splashing, rinse immediately with plenty of water. Proper storage in a shaded, dry place for up to 12 months ensures product stability.

Storage and Packaging

HEDP is available in both liquid and solid forms:

• Liquid: 200L plastic drums, IBC (1000L), and custom packaging.
• Solid: 25kg/bag, with options for customer-specific requirements.

Conclusion

1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP) is an indispensable chemical in modern industrial water treatment systems. Its exceptional properties, including scale inhibition, corrosion prevention, and chemical stability, make it a preferred choice across multiple sectors. As a trusted product from Hebei Longke Water Treatment Co., Ltd., HEDP exemplifies the synergy between advanced chemistry and industrial application. For further details, explore the HEDP product page.

References

Information about HEDP and its applications aligns with the standards and research conducted by the National Institute of Standards and Technology (NIST), which provides critical guidelines for chemical safety and performance in industrial contexts.

Keywords: HEDP, scale and corrosion inhibitor chemicals, scale and corrosion inhibitor, scale and corrosion inhibitor for cooling tower, corrosion scale inhibitor