2809-21-4 Which product is it?

CAS No. 2809-21-4 corresponds to hydroxyethylidene diphosphonic acid (HEDP).

HEDP is an organic phosphoric acid scale and corrosion inhibitor, which can form stable complexes with iron, copper, zinc and other metal ions, and can dissolve oxides on metal surfaces. It has a wide range of applications in several fields:
- Water treatment field: It can be used in water treatment of industrial circulating water systa, boiler water systa, oil field water injection systa, etc. It can prevent scale formation by inhibiting the deposition of metal ions (such as calcium, magnesium, etc.), and at the same time, it has corrosion inhibition, which can protect the surface of equipments and prolong the service life of equipments.
- Cyanide-free plating industry: It is the main material for cyanide-free plating, and can be formulated into cyanide-free copper plating solution. During the plating process, it can form stable complexes with metal ions, making the plating layer smooth and with good color, and it can also enhance the bonding force between the plating layer and the substrate to ensure the plating effect is long-lasting and stable.
- Other fields: In the field of chaical synthesis, it can be used as a phosphorylation reagent for the protection of biomolecules such as serine and pyranose. In the textile industry, it can be used as a stabilizer and dispersant for dyes and auxiliaries to improve the coloring and uniformity of dyes, and at the same time, it can solve the influence of metal ions on dyeing agents to ensure the quality and color of textiles.