High Quality 1-Hydroxyethylidene -1,1-diphosphonic Acid with High Purity 98% HEDP Powder CAS 2809-21-4

Sinobio HEDP 98% Powder

Purity: 98%

CAS: 2809-21-4

Formula: C2h8o7p2

EINECS: 220-552-8

MF: C2H8O7P2

Package: 25kg/bag

HEDP is an organophosphoric acid corrosion inhibitor. It can chelate with Fe, Cu, and Zn ions to form stable chelating compounds.It can dissolve the oxidized materials on these metals’ surfaces. HEDP shows excellent scale and corrosion inhibition effects under temperature 250℃. HEDP 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 organophosphoric 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 solid state of HEDP is crystal powder, 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.

HEDP Specification:

Items	Index
Appearance	Clear, Colorless to pale yellow aqueous solution	White crystal powder
Active content (HEDP)%	58.0-62.0	90.0 min
Active content (HEDP·H2O)%	-	98.0 min
Phosphorous acid (as PO33-)%	2.0 max	0.8 max
Phosphoric acid  (as PO43- )%	0.8 max	0.5 max
Chloride (as Cl-)%	0.02 max	0.01 max
pH (1% water solution)	2.0 max	2.0 max
Density  (20℃)g/cm3	1.40 min	-
Fe, mg/L	20.0 max	10.0 max
Ca sequestration (mg CaCO3/g)	500.0 min

HEDP Usage:

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. The dosage of 1-10mg/L is preferred as scale inhibitor, 10-50mg/L as corrosion inhibitor, and 1000-2000mg/L as detergent. Usually, HEDP is used together with polycarboxylic acid.

HEDP Application：

I. Water treatment field

1. Scale and corrosion inhibition:

*HEDP can form stable complexes with iron, copper, zinc and many other metal ions, effectively preventing the formation of scale.

*It can also dissolve the oxides on the metal surface, showing good scale and corrosion inhibition effects, even at high temperatures (e.g., 250°C) can also maintain its performance.

*HEDP is widely used as scale and corrosion inhibitor in circulating cooling water systems and medium and low pressure boilers in industries such as electric power, chemical industry, metallurgy, chemical fertiliser, oil field water injection and oil pipelines.

2.Cleaning agent and colour fixing agent:

* In the light textile industry, HEDP can be used as cleaning agent for metal and non-metal, and peroxide stabilizer and colour-fixing agent in bleaching and dyeing industry.

II. Medical field

*HEDP can also be used as a carrier for radioactive elements, and is commonly used in the medical field for tumour examinations.

III. Industrial applications

* In addition to the field of water treatment, HEDP can also be used as a complexing agent in the cyanide-free electroplating industry.