HEDP Corrosion Scale Inhibitor - Hebei Longke | Industrial Water Treatment

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

Introduction to HEDP

1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP) is a versatile organophosphoric acid widely recognized for its exceptional corrosion and scale inhibition properties. As a scale and corrosion inhibitor, HEDP plays a critical role in industrial water treatment systems, ensuring the longevity and efficiency of equipment in sectors such as power generation, chemical processing, and metallurgy. This article delves into the technical specifications, applications, and advantages of HEDP, while also highlighting the company background of Hebei Longke Water Treatment Co., Ltd., a leading provider of water treatment solutions.

Key Features and Properties of HEDP

HEDP is a corrosion scale inhibitor that exhibits remarkable chelating and anti-scaling capabilities. It forms stable complexes with metal ions such as iron (Fe), copper (Cu), and zinc (Zn), effectively dissolving oxidized materials on metal surfaces. This property makes it an ideal choice for high-temperature environments, as it maintains its efficacy even at temperatures up to 250°C. Additionally, HEDP demonstrates excellent chemical stability under high pH conditions, resisting hydrolysis and decomposition under normal light and heat. Its resistance to acid/alkali and chlorine oxidation surpasses that of other organophosphoric acids, making it a preferred option in demanding industrial settings.

The solid form of HEDP is a white crystal powder, suitable 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. The structural formula of HEDP is depicted below:

Technical Specifications of HEDP

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 extensively used in circulating cooling water systems, oil fields, and low-pressure boilers across industries such as power generation, chemical processing, metallurgy, and fertilizer production. Its applications include:

• Scale and Corrosion Inhibition: HEDP effectively prevents the formation of calcium carbonate and other mineral deposits, reducing maintenance costs and extending equipment lifespan.
• Industrial Detergents: In the textile industry, HEDP acts as a detergent for both metal and non-metal surfaces. In dyeing processes, it functions as a peroxide stabilizer and dye-fixing agent.
• Electroplating: In non-cyanide electroplating, HEDP serves as a chelating agent, enhancing the quality and uniformity of plated layers.

The recommended dosage of HEDP varies depending on the application: 1-10 mg/L for scale inhibition, 10-50 mg/L for corrosion inhibition, and 1000-2000 mg/L as a detergent. It is typically used in conjunction with polycarboxylic acids to achieve optimal performance.

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, or as per customer requirements.

For optimal storage, HEDP should be kept in a shady, dry place for up to 12 months.

Safety and Protection

HEDP is an acidic compound, and appropriate safety measures should be taken during handling. Direct contact with eyes and skin should be avoided. In case of accidental splashing, rinse immediately with plenty of water. Always refer to the Safety Data Sheet (SDS) for detailed safety information.

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

Hebei Longke Water Treatment Co., Ltd. is a leading manufacturer and supplier of water treatment chemicals, including scale and corrosion inhibitors. With a focus on innovation and quality, the company has established itself as a trusted partner in the global water treatment industry. Their products are designed to meet the stringent demands of industrial applications, ensuring efficiency, safety, and environmental compliance.

For more information about Hebei Longke Water Treatment Co., Ltd., visit their official website: Hebei Longke Water Treatment Co., Ltd.

Product Images

Below are the product images for HEDP:

Conclusion

1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP) is a high-performance corrosion and scale inhibitor with a wide range of industrial applications. Its chemical stability, chelating efficiency, and compatibility with other water treatment chemicals make it an essential component in modern industrial processes. Whether used in cooling towers, boilers, or electroplating, HEDP ensures equipment longevity and operational efficiency. For more details on HEDP and its applications, visit the HEDP product page.

References

1. National Institute of Standards and Technology (NIST) – For authoritative information on chemical properties and standards.

Keywords

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