Etidronic Acid CAS 2809-21-4
Factory wholesale Etidronic Acid CAS 2809-21-4
- Appearance:Liquid
- Purity:99.8%
- Delivery:30days
- Sample Available:Available
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Name: Etidronic Acid
CAS: 2809-21-4
MOQ: 1KG
Directory Guidance on Etidronic Acid
Chemical Structure
Basic Info:
| Melting point | 198~199℃ |
| Boiling point | 578.8±60.0 °C(Predicted) |
| density | 1.45 (60% aq.) |
| vapor pressure | 0Pa at 25℃ |
Etidronic Acid Introduction:
Etidronic Acid is an organic compound composed of phosphorus with the molecular formula C2H8O7P2 and CAS number 2809-21-4. It features two phosphate groups and one hydroxyethylidene group in its molecular structure for an O,O-diphosphoric acid structure.
This special chemical configuration gives it excellent chelating abilities and chemical stability, making it one of the more widely-used organic phosphonic acid compounds in industry. Synthesis usually utilizes phosphorous acid and acetic anhydride as raw materials and condensation reaction under specific temperature and catalyst conditions – during which, temperature and feed ratio must be strictly managed in order to ensure purity and yield of product.
Etidronic Acid can be described as a white crystalline powder at room temperature that dissolves readily in water, with weakly acidic solutions produced from its aqueous solution. Furthermore, Etidronic Acid possesses outstanding thermal stability characteristics; not easily decomposing under high-temperature conditions and possessing superior oxidation resistance properties.
Etidronic Acid’s chemical properties make it stand out, with significant chelating capabilities on a range of metal ions such as calcium, magnesium and iron; and can effectively inhibit crystallization of metal salts by forming stable cyclic complexes with them – characteristics which make it standout as scale inhibitor and corrosion inhibitor. Furthermore, Etidronic Acid’s chelating ability remains stable over various pH ranges – especially under alkaline conditions – maintaining high activity allowing its use in complex working environments.
Etidronic Acid’s mechanism of action relies heavily on multiple coordination sites within its molecules. Oxygen atoms in its phosphate group and hydroxyl group can form strong coordination bonds with metal ions to form stable five or six membered rings structures, and this leads to its effective action.
This chelating effect not only prevents metal ions from reacting with other anions to form precipitation, but can also form a protective film on metal surfaces and slow the corrosion process. According to experiments, its inhibition efficiency against common scales such as calcium carbonate and calcium sulfate scale can reach over 90% while its action concentration range is wide; even at low concentrations (1-10ppm), its significant effects can still be felt significantly.
Etidronic Acid stands out in terms of environmental compatibility as a superior biodegradable water treatment agent, thanks to its optimized structural phosphonic acid group and reduced retention time in natural waters bodies due to photolysis or microbial action. As such, this substance could become an ideal replacement for traditional products containing phosphorus that have strict environmental protection requirements.
Notable here is that its toxicological data show it to be low-toxic and has no apparent negative impacts on aquatic organisms at typical use concentrations, providing assurances for large-scale applications across industries.
Nature and Specifications:
| Item | Specification |
| Product Name | Etidronic Acid |
| CAS No. | 2809-21-4 |
| Appearance | Powder |
| Shelf Life | 2 years |
| Packing | As Your Requirements |
| pka | 1.35, 2.87, 7.03, 11.3(at 25℃) |
| form | Powder |
| color | white |
| PH | pH (1.7→100, 25℃) : 1.3～1.8 |
Product service:
- Certificate Of Analysis (COA)
- Material Safety Data Sheet (MSDS)
- Route of synthesis (ROS)
- Method of Aanlysis (MOA)
- Nuclear Magnetic Resonance (NMR)
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- Free Sample
- Factory audit
The Application Situation Of Etidronic Acid
Etidronic Acid has become an indispensable additive for industrial water treatment systems, serving to prevent scale formation by chelating calcium and magnesium ions, while attenuating corrosion by adhering to metal pipe walls to form protective films that shield them. Compare to traditional polyphosphate scale inhibitors, this one still maintains stable performance even in high temperature and hardness water environments, making it suitable for scale prevention in heat exchangers, boilers, and other equipment. Combining corrosion inhibitors like zinc salts and molybdates can create a synergistic effect and increase corrosion inhibition rates to more than 95%, making the composite formula widely utilized by power and petrochemical industries alike.
Etidronic Acid has many applications in oil extraction. Oilfield water injection systems present an inherent danger of mixing formation water and injection water, which may lead to deposition of insoluble salts such as barium sulfate or strontium sulfate, leading to formation blockage and leading to blockages that prevent production. Etidronic Acid can effectively prevent scaling by preferentially binding with barium and strontium ions to maintain oil well permeability and increase barium sulfate deposition by more than 80%, according to experimental data. Furthermore, during tertiary oil recovery processes it acts as a surfactant stabilizer, helping prevent metal ions from interfering with recovery systems and thus increase oil recovery rates.
Etidronic Acid is widely utilized as a stabilizer in hydrogen peroxide bleaching processes for textile printing and dying industries. Under high temperature alkaline conditions, hydrogen peroxide forms stable complexes with transition metal ions like iron and copper to inhibit catalytic decomposition of hydrogen peroxide by metals; this extends its effectiveness while decreasing fiber damage. Studies show that adding 0.5% Etidronic Acid can decrease the decomposition rate of bleaching solution by 60% while simultaneously raising whiteness index by 15%. When used during dyeing processes, Etidronic Acid also can improve uniformity of dye loading by integrating heavy metal ions in water; this has proven particularly helpful when dealing with reactive dyes that need fixing quickly.
Etidronic Acid has become an essential component of phosphorus-free detergents in recent years. Replacing traditional sodium tripolyphosphate (STPP), it not only maintains chelation capabilities for calcium and magnesium ions while simultaneously decreasing risks associated with water body eutrophication; personal care products utilizing it include toothpaste anticalculus agents, shampoo metal ion chelators and other formulations due to its mild chemical properties; studies have indicated that toothpaste containing 0.3% Etidronic Acid can reduce tartar formation by 40% while being non-irritating to oral mucosas.
Etidronic Acid offers unique advantages when applied to metal surface treatments. When combined with powerful acids such as hydrochloric and sulfuric acids, it not only accelerates dissolving metal oxides quickly but can also prevent over-corrosion by adhering to base metal surfaces and inhibiting over-corrosion by adhering firmly onto base metal surfaces. Adding just 1% Etidronic Acid to copper pickling solutions has been found to decrease surface roughness by 30% while simultaneously decreasing acid mist escape by 50%; furthermore it can act as stabilizers when electroplating solutions have crystallization fineness by controlling concentration of free metal ions to increase crystallization fineness and bonding strength of coatings by controlling concentrations of free metal ions that form.
The Advantages Of Etidronic Acid
Efficiency is the most prominent technological advantage of Etidronic Acid. Its molecular structure contains four coordinating oxygen atoms, with a chelating capacity of 6.8 mmol/g, much higher than organic acid chelating agents such as citric acid (3.2 mmol/g). In practical applications, only 1/3-1/2 of the dosage of traditional scale inhibitors is needed to achieve the same anti scaling effect.
Environmental performance is the key advantage that sets Etidronic Acid apart from traditional phosphorus containing products. Although it contains phosphorus in its molecule, its stable structure design through C-P bonds allows it to gradually degrade into phosphate and carbon dioxide in the natural environment, with a biodegradation rate of over 65% in 28 days, much higher than sodium tripolyphosphate (<10%). This environmentally friendly feature has enabled it to successfully pass the EU REACH regulation certification and be included in the recommended list of technical standards for environmental labeling products in China. In ecological toxicity testing, Etidronic Acid has a 96h-LC50>100mg/L for zebrafish, which is considered a practically non-toxic substance.
The economic advantage is reflected in the cost control throughout the entire lifecycle. Although the unit price of Etidronic Acid is higher than that of inorganic phosphates, its long-lasting effect can reduce the frequency of dosing and reduce the overall cost of use by 20% -40%. In the circulating water system, its duration of action can reach 72 hours, which is three times that of polyacrylic acid. This long-term effect not only reduces manual maintenance costs, but also reduces production losses caused by downtime for cleaning. According to application data from a petrochemical enterprise, after switching to the Etidronic Acid based water treatment solution, the equipment maintenance cycle has been extended from 3 months to 8 months.
The compatibility advantage makes it easy to construct composite formula systems. Etidronic Acid has good compatibility with most anionic and non-ionic additives, and can synergistically enhance corrosion and scale inhibition effects. When compounded with zinc salts, its coordination can prevent the precipitation of zinc hydroxide and increase the stable concentration of zinc ions by 2-3 times. In polymer flooding systems, it can effectively eliminate the influence of calcium and magnesium ions on polymer viscosity, ensuring system stability. This compatibility feature makes it a core component of multifunctional composite formulas, meeting the diverse needs of complex working conditions.
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Related References:
Chemicalbook-Etidronic Acid
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