1-Hydroxy Ethylidene-1,1-Diphosphonic Acid-Hedp|Scale and Corrosion Inhibitor&Water Treatment Solution

CAS No.: 2809-21-4

Molecular Formula: C₂H₈O₇P₂

Molecular Weight: 206.02

Introduction

1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP) is a versatile scale and corrosion inhibitor widely used in industrial and commercial applications. Known for its exceptional chelating properties and chemical stability, HEDP plays a critical role in water treatment systems, metal protection, and industrial cleaning. This article provides an in-depth analysis of HEDP's properties, technical specifications, applications, and the company behind its production.

Product Overview

HEDP is an organophosphoric acid that functions as a corrosion scale inhibitor. Its molecular structure allows it to chelate with metal ions such as Fe, Cu, and Zn, forming stable complexes that prevent oxidation and scale formation. This makes HEDP an essential component in systems where metal surfaces are exposed to water, heat, or corrosive environments.

One of HEDP's standout features is its ability to dissolve oxidized materials on metal surfaces, ensuring long-term protection against corrosion. It is particularly effective under high-temperature conditions (up to 250°C) and maintains stability in high-pH environments. Compared to other organophosphoric acids, HEDP exhibits superior resistance to hydrolysis and decomposition, making it a preferred choice in demanding industrial applications.

Technical Specifications

Below is a detailed specification table for 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	-

Key Properties

• Chemical Stability: HEDP remains stable under high pH, high temperature, and exposure to light and heat.
• Chelating Efficiency: It forms hexa-element chelates with calcium ions, effectively preventing scale formation.
• Synergistic Effects: When combined with other water treatment chemicals, HEDP enhances their performance.
• Low Toxicity: Compared to traditional inhibitors, HEDP offers a safer alternative for industrial use.

Applications

HEDP is a critical component in various industrial and commercial systems. Its applications include:

1. Water Treatment Systems

HEDP is widely used in scale and corrosion inhibitor for circulating cooling water systems, oil fields, and low-pressure boilers. It prevents the buildup of calcium carbonate and other mineral deposits, ensuring efficient heat transfer and prolonging equipment lifespan.

2. Metal Cleaning and Protection

As a corrosion scale inhibitor, HEDP is used in the textile industry for cleaning metals and non-metals. In the dyeing industry, it acts as a peroxide stabilizer and dye-fixing agent, improving the quality of finished products.

3. Electroplating

In non-cyanide electroplating, HEDP functions as a chelating agent, ensuring uniform metal deposition and reducing the risk of defects.

4. Industrial Cleaning

At concentrations of 1000-2000 mg/L, HEDP serves as a powerful detergent for removing stubborn residues from industrial equipment.

Product 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.

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

Safety and Handling

HEDP is acidic and requires careful handling. Always wear appropriate personal protective equipment (PPE) to avoid contact with eyes and skin. In case of accidental exposure, rinse thoroughly with water. For detailed safety information, refer to the product safety data sheet.

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

Founded with a focus on scale and corrosion inhibitor chemicals, Hebei Longke Water Treatment Co., Ltd. is a leading manufacturer of water treatment solutions. The company specializes in developing high-purity HEDP products tailored to meet the needs of diverse industries, including power generation, chemical manufacturing, and metallurgy.

With a commitment to innovation and quality, Hebei Longke ensures its products comply with international standards. The company's expertise in water treatment technologies has made it a trusted partner for clients worldwide.

Conclusion

HEDP is a versatile and reliable scale and corrosion inhibitor that addresses critical challenges in industrial water treatment and metal protection. Its unique chemical properties, combined with the expertise of Hebei Longke Water Treatment Co., Ltd., make it an essential solution for modern industries.

References

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

2. Product Specification Sheet – For detailed technical data on HEDP.

3. Hebei Longke Water Treatment Co., Ltd. – For information on the company's products and services.