2025年2月

HEDP (hydroxyethylidene diphosphonic acid) is a kind of organic phosphonic acid scale and corrosion inhibitor, which can form stable complexes with iron, copper, zinc and other metal ions, and can dissolve the oxides on the metal surface. In 250 ℃ can still play a good corrosion and scale inhibition, in high pH is still very stable, not easy to hydrolyze, general light and heat conditions are not easy to decompose. Acid and alkali resistance, chlorine oxidation resistance is better than other organic phosphonic acid (salt). It can form hexacyclic chelates with metal ions in water, especially calcium ions, thus it has better scale inhibition effect and obvious solubility limitation effect, when used in combination with other water treatment agents, it shows ideal synergistic effect.

HEDP solid belongs to high purity products, suitable for winter cold area; especially suitable for cleaning agent in electronics industry and additives for daily-use chemicals.

HEDP is widely used in electric power, chemical industry, metallurgy, fertilizer and other industrial circulating cooling water system and medium and low pressure boiler, oil field water injection and oil pipeline scale and corrosion inhibition; in the textile industry, it can be used as metal and non-metal cleaning agent, bleaching and dyeing industry peroxide stabilizers and color-fixing agents, cyanide-free electroplating industry complexing agent, pharmaceutical industry as a carrying agent for radioactive elements.

[HEDP][1] (hydroxyethylidene diphosphonic acid) is a kind of organic phosphonic acid scale and corrosion inhibitor, which can form stable complexes with iron, copper, zinc and other metal ions, and can dissolve the oxides on the metal surface. In 250 ℃ can still play a good corrosion and scale inhibition, in high pH is still very stable, not easy to hydrolyze, general light and heat conditions are not easy to decompose. Acid and alkali resistance, chlorine oxidation resistance is better than other organic phosphonic acid (salt). It can form hexacyclic chelates with metal ions in water, especially calcium ions, thus it has better scale inhibition effect and obvious solubility limitation effect, when used in combination with other water treatment agents, it shows ideal synergistic effect.

HEDP solid belongs to high purity products, suitable for winter cold area; especially suitable for cleaning agent in electronics industry and additives for daily-use chemicals.

HEDP is widely used in electric power, chemical industry, metallurgy, fertilizer and other industrial circulating cooling water system and medium and low pressure boiler, oil field water injection and oil pipeline scale inhibition and corrosion inhibition; in the textile industry, it can be used as metal and non-metal cleaning agent, bleaching and dyeing industry peroxide stabilizers and fixing agent, cyanide-free plating industry complexing agent, the pharmaceutical industry as a carrying agent for radioactive elements.

HEDP-Na4 (tetrasodium hydroxyethylidene diphosphonate) is mainly used in cleaning agents in the following aspects:

  1. Metal surface cleaning

HEDP-Na4 is able to form stable complexes with many metal ions, such as iron, copper, zinc, and so on, so as to effectively remove oxidization, rust, and mineral deposition on metal surfaces. This characteristic makes it excellent in metal surface cleaners, especially suitable for cleaning boilers, pipelines and other metal equipment.

  1. Industrial cleaners

    In industrial cleaners, HEDP-Na4 is commonly used to remove scale and mineral deposits. Its chelating ability prevents metal ions such as calcium and magnesium from combining with anions in water to form scale, and also dissolves already formed scale. In boiler cleaning agent, the concentration of HEDP-Na4 is usually 1000-2000mg/L.

    1. Cleaning application in light textile industry

    In light textile industry, HEDP-Na4 can be used as a metal and non-metal cleaning agent for removing impurities and metal ions on the surface of fibers to improve the cleanliness and softness of fabrics.

  2. Application in daily chemicals

    HEDP-Na4 can also be used as a component of household detergents to improve the cleaning effect and prevent the redeposition of limescale and stains. In addition, in cosmetics and personal care products, HEDP-Na4 acts as a chelating agent to prevent metal ions from interfering with product stability.

  3. Other cleaning-related applications

    Printing and dyeing industry: as a peroxide stabilizer and color-fixing agent, preventing color changes caused by the combination of dyes and metal ions, and improving dyeing uniformity and color stability.

    Paper industry: as bleaching auxiliary and retention aid, to prevent metal ions from interfering with bleaching agent and improve the quality and strength of paper.

Summarize

HEDP-Na4 is widely used in cleaning agents, mainly due to its excellent chelating ability and corrosion inhibition performance. It can effectively remove oxides and mineral deposits on metal surfaces while preventing scale formation and redeposition, and is widely used in many fields such as industry, light textiles, and daily-use chemicals.

Shandong Kairui Chemistry Co., Ltd. is located in Xuecheng Chemical Industrial Zone of Zaozhuang City, plant size is around 67,000 m2, adopts advanced continuous mass production technology and DCS automatic control system. Built with 5 workshops for Phosphonates, Polycarboxylic Polymers, Biocides etc., company's monomers production capacity achieves 280,000 tons per year. Besides industrial water treatment, our products are also widely used in oilfield, detergents, textile & dyeing, paper-making, seawater desalination and other fields.

Kairui Chemistry has experiences of nearly 20 years in the R&D, production management and upstream&downstream of supply chain management , as well as more than 15 years' export experiences, fast quotation system and the professional dangerous goods operation team, which ensure timely delivery and professional&satisfied service for global clients. Until now, our products have been exported to more than 70 countries & regions.

HEDP, or hydroxyethylidene diphosphonic acid, plays a vital role in a number of fields and has a wide range of applications.

In terms of the underlying mechanism of action, HEDP exhibits strong chelating properties due to its unique chemical structure containing hydroxyl and phosphonic acid groups. It combines precisely and strongly with metal ions such as calcium, magnesium and iron in water to form stable chelates. This chelating effect is like putting a “shackle” on the metal ions, preventing them from free movement and aggregation, thus effectively preventing the formation of limescale from the source. Once the scale is formed, it will adhere to the surface of pipes and equipment, which not only affects the heat transfer efficiency, but also may cause pipe blockage and equipment damage, and HEDP can precisely solve this problem.

In the industrial field, it is the “guardian angel” of the industrial circulating water system. Industrial production of a large number of water circulation, water temperature repeatedly rise and fall, the increase in impurities in the water, it is very easy to cause scale and corrosion problems. HEDP as a water quality stabilizer to join them, on the one hand, continue to inhibit the generation of scale, so that the cooling pumps, heat exchangers, pipelines and other key equipment free from scale trouble, and always maintain a high efficiency of the heat exchange efficiency, to protect the smooth production process; on the other hand, it can also be with the corrosion inhibitor tacit cooperation! On the other hand, it also works well with corrosion inhibitors to build a protective film on the metal surface, and HEDP strengthens this protective effect. Under the double guarantee, it greatly slows down the corrosion rate of the metal, reduces the high cost of frequent maintenance and replacement of equipments, and ensures the stable and efficient operation of industrial production.

In the central air conditioning water system, HEDP is also indispensable. Central air-conditioning operating conditions are complex and variable, the water temperature, water quality changes at any time, the water quality requirements are extremely high, HEDP with its own good adaptability, whether it is high temperature and humidity in the summer, or low temperature and dry winter, can flexibly respond to different water temperatures, water quality conditions, to ensure that there is no obstacle to the flow of water in the system, the condenser, the evaporator, and other core components of the heat dissipation is normal, so that air-conditioning system is always maintained in the best energy efficiency, reducing energy consumption, saving the user the energy. This reduces energy consumption, saves users money on electricity bills and extends the service life of the air conditioner.

For hot water heating systems, HEDP is the key to keeping residents warm through the winter. As hot water circulates in the heating pipes, the impurities carried in the water accumulate over time, which can easily lead to clogged pipes, corrosion and perforation, affecting the effect of heating, and the addition of HEDP can keep the water clean at all times, preventing scaling inside the radiators and pipelines, so that the heat can be uniformly and smoothly transmitted to each household, making the homes of the residents as warm as spring at all times. Moreover, it effectively slows down pipe corrosion, greatly extending the overall service life of the heating system and reducing the frequency and cost of maintenance before the heating season.

Compared with traditional water treatment agents, the advantages of HEDP are obvious. Compared with simple corrosion inhibitor, although it also synergistic corrosion inhibition, but more focused on scale prevention and control, with strong chelating and scale inhibition ability as the core competitiveness; compared with DTPMPA and other products with chelating ability, in the use of low-concentration scenarios, HEDP cost-effective and only a small amount of injection can achieve excellent scale inhibition results, saving a lot of pharmaceutical costs for the enterprise and the user, and really achieve high efficiency and economy. It is really efficient and economical.

In short, HEDP with its excellent performance, a full range of penetration into industrial production, commercial operations and daily life of various types of systems that require stable water quality, to become the mainstay of modern water treatment, and continue to create a comfortable and efficient production and living environment for people.