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

1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) is an organic phosphonic acid used as a scale and corrosion inhibitor. It forms stable complexes with metal ions like iron, copper, and zinc. HEDP is stable up to 250°C and high pH values, resisting hydrolysis, decomposition, acid, alkali, and chlorine oxidation. It forms a six-ring chelate with calcium, offering effective scale inhibition and solution limit effects. It shows ideal synergy when combined with other water treatment agents.
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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.


Names and Identifiers


1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP), also known as Etidronic Acid, has the CAS number 2809-21-4.

 Its molecular formula C₂H₈O₇P₂, with a molar mass of 206.03 g/mol. 

HEDP is recognized by several names, including 1-Hydroxyethylidene-1,1-Diphosphonic Acid and Etidronic Acid, and is also referred to by its IUPAC name, 2-hydroxy-1,2,3-propane-tricarboxylic acid.



Chemical Properties


1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP) has a density of approximately 1.45 for a 60% aqueous solution. 

It has a melting point between 198-199°C and is stable against chlorine degradation. 

It is soluble in water and exhibits good resistance to oxidation.


Production Usage


It is widely used as a scale inhibitor and anticorrosive additive in boilers and heat exchange systems. 

Its applications extend to soaps as a stabilizer, in metal and non-metal cleaning, and as a cyanide-free electroplating complexing agent. HEDP is also used in textile fixing, concrete retardation, and as a cooling system descalant. 

It acts as a preservative in carbonated waters and enhances construction materials. 

Additionally, it serves as a peroxide stabilizer. HEDP forms strong bonds with metallic elements and can be used in combination with other agents such as phosphates, polymers, and salts.


Safety and Storage


HEDP is considered less toxic, but contact with concentrated solutions may cause eye and skin irritation. Immediate flushing is required if accidental contamination occurs. 

Wear proper protective gear during handling to prevent exposure.

When storing bulk quantities, ensure adequate air circulation to prevent degradation from sunlight or extreme temperature fluctuations. Exercise caution when mixing with other chemicals, as certain combinations may lead to unwanted reactions.


Conclusion


1-Hydroxyethylidene-1,1-Diphosphonic Acid is widely used across various industries, offering numerous applications. It presents minimal health risks when proper precautions are taken during production and use. The substance should be stored away from sunlight and kept separate from strong alkalines to prevent undesirable reactions.

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