HEDP - Hebei Longke Water Treatment | Scale & Corrosion Inhibitor

CAS No.: 2809-21-4

Molecular Formula: C₂H₈O₇P₂

Molecular Weight: 206.02

Overview of HEDP

1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP) is a critical organophosphoric acid compound widely used as a scale and corrosion inhibitor in industrial and commercial applications. Its unique chemical structure allows it to chelate with metal ions such as iron (Fe), copper (Cu), and zinc (Zn), forming stable complexes that prevent scaling and corrosion. HEDP is renowned for its high stability under extreme conditions, including high temperatures (up to 250°C) and varying pH levels. This article provides an in-depth analysis of HEDP’s properties, technical specifications, applications, and the company behind its production, Hebei Longke Water Treatment Co., Ltd..

Key Properties of HEDP

HEDP is a corrosion scale inhibitor with exceptional performance in water treatment systems. Its primary properties include:

• Chelation Ability: HEDP forms stable complexes with metal ions, effectively dissolving oxidized layers on metal surfaces. This property makes it ideal for preventing scale buildup in industrial water systems.
• Thermal Stability: HEDP remains effective at temperatures up to 250°C, making it suitable for high-temperature applications such as cooling towers and boiler systems.
• Chemical Stability: It is resistant to hydrolysis and decomposition under normal light and heat conditions. Its acid/alkali and chlorine oxidation tolerance surpasses that of other organophosphoric acids.
• Scale Inhibition: HEDP reacts with calcium ions to form hexa-element chelating complexes, providing excellent scale inhibition and threshold effects. When combined with other water treatment chemicals, it exhibits synergistic effects.

Technical Specifications of HEDP

Below is a detailed specification table for HEDP, highlighting its physical and chemical properties:

Items	Index (Aqueous Solution)	Index (Solid Powder)
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 versatile chemical used across multiple industries. Its applications include:

Industrial Water Treatment

HEDP is a critical component in scale and corrosion inhibitor systems for circulating cooling water, oil fields, and low-pressure boilers. It is widely used in power generation, chemical manufacturing, metallurgy, and fertilizer production. The recommended dosage ranges from 1-10 mg/L for scale inhibition, 10-50 mg/L for corrosion control, and 1000-2000 mg/L as a detergent.

Textile and Dyeing Industries

In the textile industry, HEDP serves as a detergent for both metal and non-metal surfaces. In dyeing processes, it acts as a peroxide stabilizer and dye-fixing agent, enhancing the efficiency of textile processing.

Electroplating

HEDP is used in non-cyanide electroplating as a chelating agent, replacing toxic cyanide compounds. This application aligns with modern environmental and safety standards.

Electronic and Daily Chemical Industries

The high purity of HEDP makes it suitable for use as a cleaning agent in electronic manufacturing and as an additive in daily chemical products. Its solid form is particularly effective in cold climates, where it remains stable and functional.

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

Hebei Longke Water Treatment Co., Ltd. is a leading manufacturer of water treatment chemicals, specializing in the production of advanced scale and corrosion inhibitor chemicals like HEDP. With over two decades of experience, the company has established itself as a trusted supplier to industries worldwide. Hebei Longke is committed to innovation, sustainability, and quality, ensuring that its products meet the highest industry standards.

The company’s products are widely used in power plants, chemical facilities, and industrial cooling systems. Their focus on research and development has led to the creation of specialized formulations that address the unique challenges of water treatment in diverse environments.

Storage and Safety

HEDP is available in both liquid and solid forms. The liquid form is packaged in 200L plastic drums or IBC tanks (1000L), while the solid form comes in 25kg bags. For optimal storage, HEDP should be kept in a shaded, dry place for up to 12 months.

As an acidic compound, HEDP requires careful handling. Safety precautions include avoiding contact with eyes and skin. If contact occurs, rinse immediately with water. Proper personal protective equipment (PPE) should be worn during handling.

Conclusion

HEDP is an indispensable chemical in modern industrial processes, offering unmatched performance as a scale and corrosion inhibitor. Its chemical stability, versatility, and compatibility with other treatment agents make it a preferred choice for industries ranging from power generation to textiles. Hebei Longke Water Treatment Co., Ltd. continues to lead in the development and supply of high-quality HEDP, ensuring that its clients benefit from cutting-edge solutions tailored to their needs.

Keywords

HEDP, 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid, scale and corrosion inhibitor chemicals, scale and corrosion inhibitor, scale and corrosion inhibitor for cooling tower, corrosion scale inhibitor

References

For further information on chemical standards and industrial applications, refer to the National Institute of Standards and Technology (NIST). NIST provides authoritative guidelines on chemical properties and safety protocols, ensuring compliance with global standards.

Source: https://www.nist.gov/