1-Hydroxy Ethylidene-1,1-Diphosphonic Acid

Product Details

CasNo： 2809-21-4

MF： C2H8O7P2

Appearance： liquid

Delivery Time： 15 days

Packing： 200kg/drum

Purity： 60%

1. Basic Information​

• Molecular Formula: C₂H₈O₇P₂​

• Molecular Weight: 206.03​

• CAS No.: 2809 - 21 - 4​

• Appearance: Usually presented as a colorless to pale yellow viscous transparent liquid or white crystalline powder, odorless.​

• Melting and Boiling Points: The melting point of the solid is approximately 198 - 200°C (with decomposition). The boiling point of the liquid is relatively high, generally above 100°C and varies with concentration.​

1. Physical and Chemical Properties​

• Density: The density of the liquid is about 1.45 - 1.50g/cm³ (at 20°C, 50% concentration).​

• Solubility: It is highly soluble in water, slightly soluble in ethanol, and insoluble in organic solvents such as diethyl ether and benzene.​

• Stability: It is stable at room temperature and not prone to decomposition. It has good acid and alkali resistance. It has a strong chelating ability with metal ions and remains stable at high temperatures. However, it may react with strong oxidants.​

1. Quality Indicators​

• Active Component Content: ≥50.0%​

• Phosphorous Acid (Calculated as PO₃³⁻) Content: ≤2.0%​

• Phosphoric Acid (Calculated as PO₄³⁻) Content: ≤0.8%​

• pH Value (1% Aqueous Solution): 1.5 - 2.0​

• Calcium Chelation Value: ≥450mg/g​

1. Product Applications​

• Water Treatment Field: Widely used as a scale and corrosion inhibitor in industrial circulating water, boiler water, and cooling water systems. It can chelate metal ions such as calcium and magnesium in water, preventing scale formation and protecting metal equipment from corrosion.​

• Textile and Dyeing Industry: As a chelating agent and stabilizer, it can improve the utilization rate of dyes and the uniformity of dyeing, enhancing the dyeing effect of fabrics.​

• Detergent Field: Used in synthetic detergents and cleaners. As a chelating agent, it can enhance the detergency and prevent re - deposition of stains, especially suitable for detergents used in hard water environments.​

• Other Fields: In the electroplating industry, it is used as a metal surface treatment agent to improve the quality of coatings; in the paper - making industry, it is used in the pulp bleaching process to reduce the damage of metal ions to bleaching agents; it can also be used as a chelating agent in cosmetics to stabilize product components.​

1. Packaging and Storage​

• Packaging: The liquid is packaged in plastic drums, with 30kg or 250kg per drum. The solid is packaged in plastic - woven bags with polyethylene - lined inner bags, with a net weight of 25kg per bag. The packaging can also be determined according to user needs.​

• Storage: Store in a cool and ventilated indoor place, pay attention to moisture - proof. The storage period is generally ten months.​

1. Safety Precautions​

• HEDP is acidic. During operation, pay attention to labor protection to avoid contact with skin, eyes, etc. In case of contact, immediately rinse with a large amount of clean water.​