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HEDP

Product Details

1-Hydroxyethylidene -1,1,-Diphosphonic Acid

HEDP

(Certified by NSF STANDARD 60 and Passed REACH Registration)

CAS Number: 2809-21-4.

Molecular Formula: C2H8O7P2

Molecular Weight: 206.

Application Notes:

HEDP can chelate with Fe, Cu, Al, Zn etc. metal ions and form stable chelating compounds and dissolve the oxidized materials on metals' surfaces. It is soluble with water, shows excellent scale and corrosion inhibition effects under temperature 200°C and has good chemical stability under high pH value, hard to be hydrolyzed , and hard to be decomposed under ordinary light and heat conditions. Its acid/alkali and chlorine oxidation tolerance are better than that of other organophosphorus acids (salt). HEDP can react with metal ions in water system to form hexa-element chelating complex, with calcium ion in particular. Therefore, HEDP has good antiscale and visible threshold effects. When built together with other water treatment chemicals, it shows good synergistic effects.

The crystal powder of HEDP with high content, suitable for usage in winter and freezing districts. Because of its high purity, it can be used as cleaning agent in electronic fields and as additives in daily chemicals.

Recommended Uses:

HEDP is used as scale and corrosion inhibition in circulating cool water system, oil field and low-pressure boilers in fields such as electric power, chemical industry, metallurgy, fertilizer, etc.. In light woven industry, HEDP is used as detergent for metal and nonmetal. In dyeing industry, HEDP is used as peroxide stabilizer and dye-fixing agent; In non-cyanide electroplating, HEDP is used as chelating agent.

Product Specification: 

Items

                                           Index

Appearance

Clear colorless to pale yellow 

liquid, free from foreign matter

White crystalline powder

Active Acid (%)

58.0 - 62.0

90.0 min

Active content as HEDP.H2O (%)

---

98.0 min

Phosphorous acid as PO33- (%)

2.0 max

2.0 max

Phosphoric acid as PO43- (%)

0.8 max

0.8 max

Chloride as Cl- (ppm w/w)

100 max

100 max

Iron content (Fe ppm)

35.0 max

35.0 max

pH (1% solution)

2.0 max

2.0 max

Sequestrant value (CaCO3) mg/g as product at pH 11-12

400 min

---

Density at 20°C, g/cm3

1.440 min

---

Colour (APHA)

80 max

---

  

Items

                                                 Index

Low Arsenic

Low Heavy metal

Appearance

Clear colorless to pale yellow liquid, free from foreign matter

Active Acid (%)

58.0 - 62.0

58.0 - 62.0

Phosphorous acid as PO33- (%)

2.0 max

2.0 max

Phosphoric acid as PO43- (%)

0.8 max

0.8 max

Chloride as Cl- (ppm w/w)

100 max

100 max

Iron content (Fe ppm)

35.0 max

35.0 max

pH (1% solution)

2.0 max

2.0 max

Sequestrant value (CaCO3) mg/g as product at pH 11-12

400 min

400 min

Density at 20°C, g/cm3

1.440 min

1.440 min

Colour (APHA)

80 max

80 max

Arsenic content (As ppm)

1.0 max

---

Cu content, as Cu (ppm)

---

1.0 max

Co content, as Co (ppm)

---

1.0 max

Ti content, as Ti (ppm)

---

1.0 max

Pb content, as Pb (ppm)

---

10.0 max

Package and Storage:

HEDP liquid: Normally in 200L HDPE drum, 1000L IBC and ISO TANK.

HEDP powder: 25kg inner liner polyethylene (PE) bag and 1000kg woven bag.

Storage for 12 months in room shady and dry place.

Safety Protection:

Acidity, avoid contact with eye and skin, once contacted, flush with plenty water.

 

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