Chemical water treatment is a chemical technique that uses chemicals to eliminate and prevent scaling, reduce corrosion, kill bacteria and algae, and purify water. In the water treatment industry, chemicals are generally used to perform these tasks.

Using flocculants to remove mechanical impurities in raw water.  Using scale inhibitors to prevent scaling. Using fungicides to stop the growth of harmful microorganisms. Cleaning agent removes rust residue, old scale, and oil stains.

There are three main types of water treatment chemicals: flocculants, biocides, and scale inhibitors. The flocculants are to settle the suspended matter in the water and reduce the turbidity of the water.

An inorganic salt flocculant is usually added to a small amount of an organic high-molecular flocculant to dissolve it in water. They are mixed with the treated water, allowing the suspended matter to settle in large quantities.

The biocide is to control or remove bacteria and algae from the water. Scale inhibitors are mainly used for circulating cooling water. It can increase the concentration of water and reduce the amount of sewage to achieve the purpose of saving water. At the same time, scale inhibitors can also reduce the fouling and corrosion of heat exchangers and pipes.

HEDP is a kind of scale inhibitor. It can prevent scale and dirt. Compared to other scale inhibitors, HEDP has many advantages. Such as excellent dirt resistance, low pollution or harmless, low dose, good dissolution, good synergy. HEDP phosphonates provide the conditions for the application of alkaline water treatment technology.

Scale inhibitors commonly used in industry are mainly organic phosphonate scale inhibitors, such as HEDP and DTPMP. Phosphorus-based formulations are used in circulating water systems, mainly organic phosphonates.

Organic phosphonic acid is a compound that is directly linked to the carbon source in the phosphonic acid group. The most commonly used organic phosphonic acids are ATMP and HEDP. Organic phosphonic acids and their salts are similar in many respects to polyphosphonates. They all have a low scale effect and have a corrosion-inhibiting effect on the steel.

However, the organic phosphonic acids and their salts are not as easily hydrolyzed to the phosphonates as polyphosphonates. This is their outstanding advantage. Organic phosphonic acids and their salts have been successfully used to control corrosion and scaling of high hardness, high temperature, and high pH cooling water systems.

Therefore, organic phosphonic acids are often used as scale inhibitors.

Organic phosphonic acids and their salts have the following advantages.

• It is not easily hydrolyzed and is especially suitable for cooling water systems with high hardness, high pH, and high temperature.
• Its zinc salt is stable in water.

As a China HEDP manufacturer and China HEDP supplier, IRO has always provided high-quality HEDP products. And, IRO’s HEDP has great advantages in price. If you have any requirements, please contact us.

The main product of this website is HEDP, an organic phosphonic acid in water treatment. HEDP can be used as a scale inhibitor or as a metal cleaner. However, there are more water treatment products in the water treatment industry.

According to different USES and processes, the main types of water treatment chemicals are as follows.

Synergetic preparation can effectively prevent the formation of scale and microbial viscosity, improve the system desalination rate and water yield, and prolong the service life of reverse osmosis membrane.

Circulating cooling water treatment chemicals ensure that the cooling tower, chiller, and other equipment are in the best running state. They can effectively control the microbial flora, inhibit the production of scale, and prevent corrosion of pipeline equipment. To reduce energy consumption and prolong the service life of the equipment.

Synergetic preparation can prevent the boiler from corroding and scaling. It can stabilize the boiler water quality and ensure the normal operation of the boiler. Synergistic combination preparation can reduce the boiler consumption and prolong the service life of the boiler.

In addition, the preparation of wastewater treatment needs to be done well. Water treatment technology combined with depth treatment can be used for a long time. It also saves a lot of water.

When the system is of high hardness and alkalinity, chelators and dispersants are not sufficient to prevent them from settling. If there are no dispersants, the growth of the dirt will follow the general rule of the growth of the crystal, and the formation of dirt will be firmly attached to the surface of the heat exchanger.

If there is enough of dispersant, scale particles (is made up of hundreds of thousands of CaCO₃ molecules) surrounded by adsorption and dispersant, prevent dirt particles are arranged in its rules on the crystal lattice of the crystal lattice, resulting in a dirt soft and easy to be water washed away.

There are many kinds of scaling on the surface of the metal, such as oil-soluble scaling, water-soluble scaling, metal rust, and scaling. HEDP is mainly used to clean inorganic scale, alkaline oxide, and hydroxide of the metal surface.

The commonly used organic acids metal cleaning agent is HEDP acid. In the process of pickling, HEDP acid cannot only dissolve scaling but also play a role in inorganic scale.

On the one hand, the composition of inorganic salts changes, and some inorganic salts are converted to soluble salts. For example, calcium carbonate and magnesium carbonate are converted to calcium chloride and magnesium chloride by hydrochloric acid.

The other part is converted into new insoluble salts, but the new insoluble salts formed in a short time are dispersed and easily washed away.

Therefore, the effective utilization of the characteristics of HEDP can greatly reduce the formation of the scale of the metal surface. So that the metal equipment can work better in production.

HEDP is an organic phosphonic acid that can be used in many fields. HEDP and its sodium salts (HEDP Na, HEDP Na₂, HEDP Na₄) are called all-purpose organic phosphine products. HEDP and its sodium salts have occupied a large proportion of global sales of corrosion inhibitors.

Now, you will better understand HEDP and its sodium products here. Two Uses of Organic Phosphonic Acid, HEDP. They are scale Inhibitors and metal cleaning agents.

First, let us understand the inhibition mechanism of organic phosphonic acid.

As for the organic phosphonic acid, its inhibition mechanism is an electrodeposition film. The organic phosphonic acid in the water is a negatively charged ion. It reacts with calcium ions in water. They produce a positive and negative charge of complexing ions “Na₂Ca₂P₆O₆“.

Relying on the current generated during metal corrosion, this complex is deposited on the metal surface. This will hinder the contact of oxygen with metal. In this way, the effect of suppressing corrosion can be achieved.

Therefore, phosphine-based formulations require a certain concentration of calcium ions in water. Other organophosphorus scale inhibitors (such as HEDP, DTPMP) work in the same way.

The zinc salt forms a zinc hydroxide precipitate in the cathode, which suppresses the cathodic reaction and acts as a corrosion inhibitor. The formation of zinc film is fast, but the film is loose and weak. It is usually used with other corrosion inhibitors such as zinc phosphate. Because it deposits tightly on the metal surface as soon as it settles, it is relatively strong and compact.

Usually, several inhibitors, like HEDP, DTPMP. They are used together in a certain proportion. Several kinds of corrosion inhibitors are used together with certain proportions, which is smaller than the amount used alone, and the effect is better. This is the so-called “synergy effect”.

Scale inhibitors remove and prevent scaling, improve heat transfer efficiency, and reduce energy and fuel consumption. In the water treatment industry, HEDP can also reduce sewage discharge and increase water utilization.

HEDP is used as a scale inhibitor to disperse insoluble inorganic salts in water. HEDP scale inhibitors prevent or interfere with precipitation and scaling of insoluble inorganic salts on metal surfaces. At the same time, HEDP scale inhibitors can maintain good heat transfer performance of metal equipment.

The cleaning temperature of HEDP used as a metal cleaning agent is generally 50 ~ 85 °C. Dilution oil cleaning temperature is 50～60°C. Heavy oils have a higher temperature of higher melting point oils. The cleaning time of the HEDP cleaning agent is related to the cleaning method.

According to the characteristics of the cleaning agent, the cleaning time is 2 to 10 minutes or more.

Cleaning methods include immersion cleaning, spray cleaning, ultrasonic and multi-stage cleaning. The cleaning process is generally: washing, rinsing, dehydration, and rust-proof treatment.

For example, the pre-plating cleaning process for oil contaminated parts is as follows. Degreasing, washing, pickling, washing, alkaline soaking (ultrasonic), anodic electrolytic cleaning, washing, activating, washing and plating.

HEDP acid is a typical metal cleaning agent. HEDP acid has its own acidity and excellent chelating activity. HEDP can chelate, dissolve and disperse special dirt such as oxide layer adhering to the metal surface to achieve the purpose of cleaning.

IROCHEM has a long-term supply of high-quality HEDP and its sodium products.

In the water treatment industry, people all know how important the HEDP is and how widely used it is. After reading this article, you can see why does HEDP so popular.

HEDP has excellent corrosion resistance to carbon steel, copper and copper alloys. It has good dispersion properties for calcium carbonate and calcium phosphate. HEDP is the most important scale inhibitor in IROCHEM.

HEDP is mainly used in the open circulating cooling water treatment system. This acid is especially suitable for copper equipment system. HEDP acid can be used for high pH, high alkalinity, and high hardness water. It is one of the ideal water treatment agents that do not adjust pH.

HEDP is the main agent for water quality stabilization of circulating cooling water system. It is an organic phosphonic acid water treatment agent. This kind of water treatment agent products also include some other varieties, such as HEDP and DTPMP. Organic phosphonic acid is a water treatment agent developed in the late 1960s and confirmed in 1970s.

Organic phosphoric acid has greatly improved water treatment technology. Compared with other organic polyphosphoric acids, HEDP has the characteristics of good chemical stability, low hydrolysis, high-temperature resistance, and small dosage.

It is a cathodic inhibitor and is a nonchemical equivalent scale inhibitor. HEDP acid has an excellent chelating ability for many metal ions such as calcium, magnesium, copper, and zinc.

Even for the inorganic salts such as CaSO4, CaCO3, and MgSiO3, HEDP has a good inactivation effect. HEDP has a large number of applications in water treatment industry. It is also one of the main products of IROCHEM. One thing for sure, HEDP is low-toxicity. In the biotoxicity test, the mice subcutaneous test LD50 was 486.4 mg/kg.

The HEDP acid is also used as a metal cleaner in the textile industry due to its good corrosion inhibition capability.

All kinds of condenser, heat exchanger and filter, reverse osmosis equipment are widely used in textile industry. Due to the change in water quality and temperature difference, it is very easy to cause fouling in the equipment. That can greatly reduce the heat transfer and filtration efficiency of the equipment, resulting in a shutdown. Traditional methods are usually manual cleaning, high-pressure water washing, and chemical cleaning.

These methods not only have a poor cleaning effect but also cause corrosion and damage to metal tube and screen. And shortened the service life of the equipment. Currently, HEDP is used as a metal cleaning agent in the textile industry to deal with the scaling phenomenon.

HEDP can effectively remove scale, calcium oxide, silt and rust from water equipment. It has a remarkable effect in cleaning technology of carbon steel, stainless steel, copper, and other materials.

HEDP is the main product of IROCHEM. It has the most sales of all organophosphoric antiscale and corrosion inhibitors in IRO. The HEDP market is in great demand. In order to meet the requirements of clients, IRO has optimized and improved the production of HEDP. Among the many methods of preparing HEDP in the industry, the following three methods are mainly used.

The First Method

The glacial acetic acid reacts with phosphorus trichloride. Then to concentrate the acylation products and phosphorus trichloride hydrolysis products. Add the measured water and glacial acetic acid into the reactor and stir evenly. Add phosphorus trichloride during the cooling period. The reaction temperature should be controlled between 40 °C to 80 °C. Hydrogen chloride gas, the by-product of the reaction is condensed and fed into the absorber to recover hydrochloric acid.

Excessive acetyl chloride and acetic acid are condensed and returned to the reactor. After the phosphorus trichloride to join, the temperature rises to 100 ~ 130 °C. The time is 4 hours to 5 hours. After the reaction, water vapor hydrolysis was introduced. The residual acetic acid and low boiling point substance are distilled. And then get the product.

The Second Method

Through the nucleophilic addition of diethylenetriamine and formaldehyde. The product was esterified and neutralized with the hydrolyzed product of trichloride. And then get the product.

The third Method

Phosphorus trichloride is mixed with glacial acetic acid. To heat and distill them, and get acetyl chloride. And then to react that with the phosphoric acid. The products sold in the market is a viscous liquid diluted to 50% of water. Each ton of products consumes 931 kilograms of phosphorus trichloride (95%) and 591 kilograms of glacial acetic acid.

The HEDP production process adopted by IROCHEM combines many advantages of the above methods. And IRO has made further innovations and improvements. For this reason, the HEDP products produced by IRO are recognized by the market and clients.

Compared with organic phosphonic antiscale and corrosion inhibitors, HEDP has better chemical stability. It doesn’t hydrolyze easily, and it’s resistant to heat. HEDP has a good chelating ability for a variety of metal ions.

Such as calcium, magnesium, copper, zinc ions. At present, the commonly used organic phosphorus chelators are HEDP, DTPMP, BHMTPMPA, PAPEMP, etc.

HEDP is not only a good chelating agent but also a good stabilizer.

A stabilizer is a chemical that enhances the stability of the solution, colloids, solids, and mixtures. It can slow down the reaction. It keeps the chemical balance. It reduces surface tension. It protects against the light. It can be decomposed or decomposed.

Chemical stabilizers are widely available in the broad sense. Any chemicals can be used flexibly to achieve a stable purpose. The product quality is mainly based on the design purpose of the formula designer. HEDP is an excellent peroxide stabilizer.

In order to better development of the water treatment industry and meet clients’ requirements, IROCHEM has manufactured a series of new products. Such as ATMP, HEDP,  EDTMP, DTPMP, PBTCA, HPAA, PAPE and PAPEMP.

However, the study of organic phosphine inhibitors continues to develop. There are a lot of reports about organic phosphonic antiscale and corrosion inhibitors in China every year. Because of the kind of corrosion inhibitors have so many functions, such as scale inhibition, corrosion inhibition, antifreeze, and lubrication. They are getting more and more attention.

IROCHEM’s other organic phosphonic antiscale and corrosion inhibitors also have the advantages of high efficiency and good stability. The main types are polyamide, polyacrylic acid, polyether, and other phosphorous polymers. Scale inhibitor is composed of organic phosphine, fine copolymer and copper corrosion inhibitor. They have excellent corrosion resistance to carbon steel, COP and copper alloys.

And these scale inhibitors have good dispersion properties of calcium carbonate and calcium phosphate. IROCHEM’s scale and corrosion inhibitors are mainly used for the open circulating cooling water treatment system, especially for copper equipment system. HEDP can be used for high pH, high alkalinity and high hardness of water quality. It is one of the ideal non-ph alkaline treatment water treatment agents.

HEDP accounts for a large proportion of all organophosphate corrosion inhibitor products. HEDP is also one of IROCHEM’s main products. It is well known that HEDP is an organic phosphonic acid scale inhibitor. It can form a stable complex with metal ions such as iron, copper, and zinc. HEDP can remove and reduce metal ions in water very well. HEDP can dissolve the oxide on the metal surface.

It is still under 250 ℃ can play a role of good scale and corrosion inhibitor. Its acid and alkali resistance and chlorine oxidation are better than other organic phosphonic acids (salt) products. HEDP can form six ring chelates in water with metal ions, especially calcium ions.

The results show that the six ring chelates have a good effect of scale inhibition and obvious dissolution. When combined with other water treatment agents, the siX-ring chelate has the ideal synergistic effect. HEDP is not easy to hydrolyze and remains stable under high pH.

HEDP  is not easy to decompose under normal photothermal conditions. It is important to note that only high-purity solid HEDP products are suitable for use in cold winter areas. This solid HEDP is especially suitable for cleaning agents and daily chemical additives in the electronics industry.

In recent years, the demand for HEDP market in China has been increasing year by year. In 2017, the demand of HEDP in China is about 1456,000 tons. And it is estimated that the HEDP acid demand will reach 2608,000 tons by 2020.

HEDP is short for hydroxyethylidene diphosphonic acid. Hydroxyethylidene diphosphonic is widely used in petroleum, chemical, metallurgy, transportation, light industry, textile, and other industries. HEDP (hydroxyethylidene diphosphonic acid) can be used as a corrosion inhibitor, scale inhibitor, metal chelating agent, peroxide stabilizer, peroxide curing agent, complexing agent of electroplating industry, electronics industry cleaner, and daily chemical additives, etc.

In practical applications, HEDP acid and other water treatment agents have a better synergistic effect when used in combination. For this reason, it is important to note that the antagonism between the components is due to improper compounding. That will cause the effect to be reduced or lost. At the same time, we should make full use of the synergistic effect to increase the HEDP effect.

In addition, most water treatment systems are open systems. These systems have a certain amount of emissions. Therefore, when using HEDP, you should consider the impact on the environment.

Common HEDP products and its salts include HEDP 30, HDEP 60, HEDP liquid, HEDP solid, HEDP Na, HEDP Na₂, HEDP Na₄, HEDP Kx, etc.

HEDP (Hydroxyethylidene Diphosphonic Acid) is an odorless organic phosphorus chemical compound. For one thing, it is colorless to yellowish acidic liquid.

In recent years, the demand for HEDP market in China has been increasing year by year. In 2017, the demand of HEDP acid in China is about 1456,000 tons. And it is estimated that the HEDP demand will reach 2608,000 tons by 2020.

The formation and development of the water treatment industry are accompanied by the rapid development of the economy and the process of urban industrialization. The shortage of water resources and the enhancement of human environmental awareness provide the driving force and a huge market for the development and growth of the water treatment industry.

HEDP is the development of China with the introduction of modern water treatment technology and development. HEDP developed later than developed countries, but it is growing fast. It has developed a system of independent development and industrialization of various water treatment reagents including HEDP.

The development of Chinese water treatment agent can be divided into two stages. From 1974 to 1989, the first stage was the introduction of absorption and localization. The goal of this stage is to establish a research and manufacturing system for water treatment in China. From 1990 to 2000, the second stage was the innovation and development and industrialization. The goal is to establish a water treatment agent and technology system with independent intellectual property rights in China.

So far, China has more than 100 kinds of water treatment products, such as HEDP and DTPMP. HEDP and HEDP salts have basically met the domestic demand from production to quality and can also be exported. Technically, some production technology and performance have been at the international leading level.

Due to the huge potential of HEDP acid market, the industry competition is increasingly fierce. However, most enterprises are small in scale and low in technology. And the product homogenization is serious. The competition in the industry is mainly reflected in the quality, brand and marketing channels. Among this competition, brand formation is a long-term accumulation process. And the brand competition is also a comprehensive reflection of the competition in hydroxyethylidene diphosphonic acid industry.

New enterprises continue to enter the water treatment industry. HEDP market has a new development situation. Upstream raw material prices continue to rise, leading to lower industry profits. Therefore, the market competition in HEDP industry is increasingly fierce. IROCHEM focuses on innovation. In order to develop better, IROCHEM fully understands the development of the industry and our position in the industry. IROCHEM will provide high-quality products and services to global partners.

This article about “7 Basic Principles of Industrial Wastewater Treatment” is posted on IROCHEM HEDP website – www.irohedp.com. If you want to quote, please indicate the source.

Industrial wastewater includes production wastewater, sewage, and cooling water. Industrial wastewater refers to wastewater and waste liquid generated in the industrial production process. It contains industrial materials, intermediate products, and other pollutants.

There are many kinds of industrial wastewater. And they are complicated. For example, electrolysis salts industrial wastewater contains mercury. Heavy metals smelting industrial wastewater contains various metals such as lead, cadmium. Electroplating industrial wastewater contains cyanide and chromium. Oil refining industrial wastewater contains phenol. Pesticide industry wastewater contains various pesticides and so on.

Due to industrial wastewater often contains a variety of toxic substances. The substances are great harm to the environment and human health. So it is very necessary to develop comprehensive utilization and minimize the hazard. And according to the composition and concentration of pollutants in wastewater, the purification measures should be done before discharge.

As we all know, the impact of industrial wastewater on the environment is enormous. And the difficulty of processing is also unbelievable. 7 basic principles of industrial wastewater treatment should be noticed. They are summarized as follows:

1. Choose non-toxic production technology to replace or improve the antiquated production process. And eliminate or reduce the production of poisonous and harmful wastewater as far as possible in the production process.
2. In the process of using toxic raw materials and producing toxic intermediates and products. Operation and supervision should be carried out strictly to eliminate dripping, reduce loss, and adopt reasonable processes and equipment.
3. Wastewater containing highly toxic substances, such as some heavy metals, radioactive substances, a high concentration of phenol and cyanide wastewater. That should be separated from other wastewater for processing and recycling of useful substances.
4. The wastewater with the large flow and light pollution should be properly treated and recycled. It is not good to be discharged into the sewer. For fear that increases the urban sewage and urban sewage treatment workload.
5. Organic wastewater similar to urban sewage, such as food processing wastewater, sugar wastewater, and papermaking wastewater. It can be discharged into an urban sewage system for treatment.
6. Some toxic wastewater that can be biodegradable, such as phenol and cyanogen wastewater. They should be treated first and discharged into the city drain according to the allowable discharge standard. And then do further biochemical treatment.
7. Toxic wastewater containing difficult biodegradation should be treated separately and should not be discharged into urban sewage.

The development trend of industrial wastewater treatment is to recycle wastewater and pollutants as useful resources or to implement closed-circuit circulation.

IRO CHEM has more than 10 years of experience in the water treatment field. HEDP is one of the main products. HEDP acid can chelate with metal ions in water and form six ring chelate. Thus HEDP has good scale inhibition effect. It has a good effect to reduce the impact of industrial wastewater.

By the way, the HEDP products of IRO CHEM are the most cost-effective in the world. It has high quality and the price is acceptable for most clients. Other water treatment chemicals, you can move to IROWATER.COM.