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

This product is an organic phosphonic acid scale and corrosion inhibitor, which can form stable complexes with iron, copper, zinc and other metal ions, and can dissolve oxides on the metal surface. It can play a good role in corrosion and scale inhibition at 250 ℃, is still stable at high pH value, is not easy to hydrolyze, and is not easy to decompose under general light and heat conditions. Acid and alkali resistance and chlorine oxidation resistance are better than other organic phosphonic acids (salts). It can form a six-ring chelate with metal ions in water, especially calcium ions, so it has a good scale inhibition effect and an obvious solution limit effect. When combined with other water treatment agents, it shows ideal Synergistic effect.
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Product Name 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP)
Synonyms 1-Hydroxyethylidene-1,1-diphosphonic acid
Molecular Formula C2H8O7P2
Molecular Weight 201.9987
CAS Registry Number 2809-21-4
Molecular Structure 图片1
Product Application It serves as a scale and corrosion inhibitor for boilers and heat exchangers, a complexing agent for cyanide-free electroplating, a chelating agent for soap production, and a cleaning agent for both metal and non-metal surfaces.


Product Information:

1-Hydroxyethylidene-1,1-Diphosphonic Acid, commonly known as HEDP or Etidronic acid, bears the CAS number 2809-21-4. 

This versatile molecule features a molecular formula of C₂H₈O₇P₂ and molar mass at 206.03 grams per mole. 

With density around 1.45 for a 60% aqueous solution, this substance exhibits properties including melting point between 198-199°C and high stability against chlorine degradation.

Usage and Performance:

As a crucial industrial chemical, HEDP functions primarily as a boiler and heat exchange system's scale inhibitor and anticorrosive additive.

 Its applications also extend beyond these domains – serving as a stabilizer in soaps, cleanser for metals and non-metals, electroplating complexing agent without cyanide, textile fixing aid, concrete retardant, cooling systems descalant, carbonated waters preservative, construction material enhancer, and even as a peroxide stabilizer. 

A key advantage lies within its ability to create durable bonds with various metallic elements, making it suitable for combined treatments alongside additional agents like phosphates, polymers, and salts.

Health and Handling Precautions:

Although considered less toxic overall, contact with concentrated solutions may cause eye and skin irritation necessitating immediate flushing if accidental contamination occurs.

Proper protective gear during handling ensures safety from any unintended harm due to prolonged exposures. 

Additionally, maintaining adequate air circulation when storing bulk quantities helps prevent undue deterioration caused by sunlight or extreme temperature fluctuations.

Lastly, exercise care when mixing different chemicals since certain combinations could lead to unwanted reactions.

Conclusion:

1-Hydroxyethylidene-1,1-Diphosphonic Acid stands out owing to its multitude of uses spanning numerous industry segments coupled with reasonable health risks provided appropriate precautions are taken throughout production processes and end application scenarios alike.away from sunlight, and avoid mixing with strong alkalines.

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