1-HYDROXYETHYLIDENE-1,1-DIPHOSPHONIC ACID (HEDP)

1-HYDROXYETHYLIDENE-1,1-DIPHOSPHONIC ACID (HEDP)

What is 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP)?

1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) Molecular Formula; C₂H₈O₇P₂

1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) Molecular Weight; 206.027 g/mol

1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) Chemical Name; 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP)

1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) CAS Number; 2809-21-4

Synonyms used for 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP);

• Etidronic Acid
• 1-Hydroxyethylidene-1,1-Diphosphonic Acid
• HEDP
• HEDP(A)
• HEDPA
• Hydroxyethylidene Diphosphonic Acid
• 1-Hydroxyethylidene Diphosphonic Acid
• 1-Hydroxyethane-1,1-diphosphonic Acid
• 1-Hydroxyethylidenedi(phosphonic acid)
• 1-Hydroxyethylidene-1,1-bis-(phosphonic acid)
• Ethane-1-Hydroxy-1,1-Diphosphonic Acid
• 1-Hydroxy-1,1-Diphosphonate
• Oxyethylidenediphosphonic Acid

1-Hydroxyethylidene-1,1-Diphosphonic Acid is commercially abbreviated as HEDP. It is generally known by this name, HEDP, in industry and common language. It is also widely used by some as Etidronic Acid.

1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) is an acidic and organic water treatment chemical with the chemical structure of phosphonates, generally considered industrial grade.

The 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) molecule is formed by the bonding of 2 classic phosphonic acid (H2PO3) groups, an acidic phosphonate group above and below the structure, 4 reactive hydroxyl groups (OH), phosphorus, hydrogen, and Oxygen.

As an acidic phosphonate chemical, 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) functions as a chelating or sequestering chemical agent to prevent scale formation in industrial factory and power plant processes. In such industrial processes, 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) acts as a corrosion inhibitor to prevent rust.

1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) is a unique chemical among polyphosphates and other phosphonate families because it forms complex molecules with Cu (Copper), Zn (Zinc), Fe (Iron), and Ca (Calcium) ions to reduce the effect of these metal ions and to passivate them, and also due to its Cl (Chlorine) stability.

1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) can dissolve oxidized materials on the surfaces of these metals. At its optimum operating temperature of 250 °C, 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) has an ideal usage amount and excellent corrosion-inhibiting effects.

1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) acts as a stabilizing agent.

How is 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) Produced?

1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) is generally produced as an industrial solution in the form of a 60% aqueous solution.

There are 2 different methods for the production of 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP). One of them involves the reaction of phosphorous acid (H₃PO₃) with Acetic Anhydride ((CH₃CO)₂O). The chemical equation is as follows:

2H₃PO₃ + (CH₃CO)₂O 》C₂H₈O₇P₂(HEDP) +CH₃COOH

Here, Acetic Acid (CH₃COOH) is formed as a by-product. This method is used by some manufacturers in America.

1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) is generally produced as an industrial solution in the form of a 60% aqueous solution.

1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) is produced by the reaction of Glacial Acetic Acid (CH₃COOH) and Phosphorus Trichloride.

The reaction equation for the production of 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) is as follows:

CH₃COOH+2PCl₃+5H₂O》C₂H₈O₇P₂(HEDP) + 6HCl

Here, Hydrochloric Acid (HCl) is produced as a by-product. This method is generally used by Chinese manufacturers.

What are the Physical and Chemical Properties of 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP)?

1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) has a mild odor. It is freely miscible with alcohols and organic solvents.

1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) has strong acidic properties with a pH value lower than 1.

Physically, 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) is usually found as a clear, colorless liquid solution, or a pale yellow aqueous solution, or in a higher purity crystalline powder form.

While the active content in the aqueous solution of 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) is 60%, the active content of 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) in crystalline powder form is over 90%. This means the purity level is higher.

1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) is a water-soluble chemical.

1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) is stable. It is incompatible with oxidizing agents.

Density: 1.45 g/cm³

Melting Point: 198-199 °C

Boiling Point: Information not available

What are the Effects of 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) on Human Health?

1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) can cause severe skin burns and eye damage.

In case of contact with eyes, 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) can cause serious eye problems. For this, rinse with plenty of water and remove contact lenses if present.

Before application with 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP), personal protective equipment such as gloves, goggles, masks, and body protectors must be actively used.

How is 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) Stored?

1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) is packaged in 250 or 290 kg plastic drums or 1450 kg IBCs.

The crystalline powder form of 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) can also be packaged in 25 kg bags. This varies according to customer requirements and demands.

In regions with harsh cold weather conditions, the solid form of 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) is used. This is due to the freezing of the liquid form of 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP).

1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) should not be stored in areas exposed to direct sunlight or in places with temperatures higher than room temperature. Storage in such places will cause the active substance of 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) to decompose, reducing its effectiveness.

1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) can be stored in a shaded, dry storage area for a period of 10 months.

What are the Application Areas of 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP)?

• 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) chelates at a high level with many earth metal ions such as Fe+2, Mg+2, Ca+2, Pb+2, and Ba+2. It effectively dissolves oxidized materials on these metal ions. 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) creates a very good effect with other chemical substances used in water treatment systems. And its synergy with these treatment chemicals is very strong.
• Due to its high chlorine stability, 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) has excellent compatibility for stain prevention in swimming pools. And 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP), is used extensively in this field.
• 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) is used as a good sequestrant and stabilizer over a wide range of temperatures and pH to prevent scaling and precipitation of, for example, CaCO3 and other metal compounds.
• 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) is generally used extensively in industrial water treatment systems.
• In the pharmacological sector, the high-purity product of 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) is used in the production of some formulas.
• The most common use of 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) in the commercial field with 3 basic functions is in the water treatment sector, where it functions to sequester heavy metal ions such as iron and manganese oxides, and color-causing agents in water. It has scale inhibition properties in desalination processes.
• 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) is used as a scale-inhibiting agent in boilers, air conditioning units, and cooling towers of power plants, as well as in the heating/cooling towers of some factories with hot processes.
• 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) can prevent the decomposition of bleaching, oxidizing agents like Hydrogen Peroxide.
• 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) is also known to be the only phosphonate group used in municipal water treatment plants, personal care products, and soap preservatives.
• A solution of 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) with appropriate purity is approved and used as a drinking water additive.
• 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) is the phosphonate group used as a preservative in personal care products such as bar soaps and shampoos.
• The single largest application of 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) is in industrial water treatment and therapy applications.
• 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) is used extensively in the cooling waters of electric power plants.
• It is used in the production of Hydrogen Peroxide-based oxidants for hair lightening to prevent swelling of the formulation during or before application.
• It is in the phosphonate group used in the manufacturing of acidizing solutions prepared for oil and natural gas wells.
• Deposits form in cooling water systems. HEDP is used to remove these deposits. 

What Factors Affect the Price of 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP)?

The price of 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) shows a short-term decline with the establishment of a new 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) production facility. It returns to its former level when competition becomes reasonable.

The prices of 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) increase when a new application area for this chemical emerges.

The prices of 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) increase with the rise in the prices of chemicals and inputs used in the production of 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP).

The price of 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) has been on a steady rise for a very long time.

The price of 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) varies according to the costs of the production method. In the method using Phosphorus Trichloride (PCl3), the costs are lower, so the price of 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) is also lower. However, the price of the by-product is also low. Therefore, in the system where Acetic Acid (CH₃COOH) is produced as a by-product, the price of 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) may balance out.