Brand:Daming Technology
MOQ:10
Quantity:50
1-Hydroxy Ethylidene-1,1-Diphosphonic Acid(HEDP)
CAS No.: 2809-21-4
Molecular Formula:C2H8O7P2
Molecular weight: 206.02
Dequest: 2010
Structural Formula:
HEDP is an organophosphoric acid corrosion inhibitor. It canchelate with Fe, Cu, and Zn ions to form stable chelatingcompounds.
It can dissolve the oxidized materials on these metals' surfaces.HEDP shows excellent scale and corrosion inhibition effects undertemperature 250°C. HEDP has good chemical stability under high pHvalue, hard to be hydrolyzed, and hard to be decomposed underordinary light and heat conditions. Its acid/alkali and chlorineoxidation tolerance are better than that of other organophosphoricacids (salt). HEDP can react with metal ions in water system toform hexa-element chelating complex, with calcium ion inparticular. Therefore, HEDP has good antiscale and visiblethreshold effects. When built together with other water treatmentchemicals, it shows good synergistic effects.
The solid state of HEDP is crystal powder, suitable for usage inwinter and freezing districts. Because of its high purity, it canbe used as cleaning agent in electronic fields and as additives indaily chemicals.
Specification:
items | index | |
Appearance | Colorless or light yellow transparent liquid | White crystal powder |
Active content (HEDP)% | 58.0-62.0 | 89.0 min |
Phosphorous acid (as PO33-)% | 1.0 max | 0.5 max |
Phosphoric acid (asPO43- )% | 0.5 max | 0.5 max |
Chloride (as Cl-)% | 0.3 max | 0.1 max |
pH (1% solution) | 2 max | 2 max |
Density (20°C)g/cm3 | 1.40 min | - |
Fe ion ppm | 10 max | 20 max |
Ca sequestrant Value | 450 min | - |
Colour APHA (Hazen) | 40 max | - |
Usage:
HEDP is used as scale and corrosion inhibition in circulating coolwater system, oil field and low-pressure boilers in fields such aselectric power, chemical industry, metallurgy, fertilizer, etc.. Inlight woven industry, HEDP is used as detergent for metal andnonmetal. In dyeing industry, HEDP is used as peroxide stabilizerand dye-fixing agent; In non-cyanide electroplating, HEDP is usedas chelating agent. The dosage of 1-10mg/L is preferred as scaleinhibitor, 10-50mg/L as corrosion inhibitor, and 1000-2000mg/L asdetergent. Usually, HEDP is used together with polycarboxylicacid.
Package and Storage:
HEDP liquid: Normally In 250kg net Plastic Drum, IBC drum can alsobe used as required.
HEDP solid: 25kg inner liner polyethylene (PE) bag, outer plasticwoven bag,, or confirmed by clients.
Storage for ten months in room shady and dry place.
Safety Protection:
Acidity, Avoid contact with eye and skin, once contacted, flushwith water.
1-HydroxyEthylidene-1,1-Diphosphonic Acid (HEDP)
