1-Hydroxy Ethylidene-1,1-Diphosphonic Acid,HEDP,HEDP,1-Hydroxy Ethylidene-1,1-Diphosphonic Acid,HUTONG GLOBAL CO.,LTD

1-Hydroxy Ethylidene-1,1-Diphosphonic Acid

Item : HEDP

Details :

1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP)

CAS No.: 2809-21-4
Molecular Formula: C₂H₈O₇P₂
Molecular weight: 206.02
Dequest: 2010
Structural Formula:

Properties:
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.

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℃)g/cm3	1.40 min	-
Fe ion ppm	10 max	20 max
Ca sequestrant Value (mg Ca CO3/g)	450 min	-
Colour APHA (Hazen)	40 max	-

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.

Package and Storage:
HEDP liquid: Normally In 250kg net Plastic Drum, IBC drum can also be used as required.
HEDP solid: 25kg inner liner polyethylene (PE) bag, outer plastic woven 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, flush with water.

Monosodium of 1-Hydroxy Ethylidene-l,1-Diphosphonic Acid
(HEDP·Na)

CAS No.: 29329-71-3
Molecular Formula: C₂H₇O₇P₂Na
Dequest: 2016A
Molecular weight: 228

Items	Index
Appearance	Colorless or light yellow transparent liquid
Active component(HEDP) %	19.0-21.0
Fe (as Fe³⁺) (ppm)	20max
pH value (1% water solution)	2.3-2.9
Density (20℃)g/cm³	1.11-1.21

Disodium of 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid
(HEDP·Na₂)

CAS No.: 7417-83-7
Molecular Formula: C₂H₆O₇P₂Na₂
CubleK: 2012
Molecular weight: 250
Dequest: 2016BD

Items	Index
Appearance	Colorless to light yellow transparent liquid	White powder
Active component (HEDP) %	16.5min	74.0-79.0
Active component (HEDP·Na₂) %	20.0min	89.8min
Density (20℃)g/cm³	1.12-1.22	-
Fe (as Fe³⁺) (ppm)	-	35max
Phosphorous acid (PO₃^3-计)%	-	3max
Dry weight loss, %	-	3-6
PH(1% water solution)	4.0-6.0	4.0-6.0

Tetra sodium of 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid
(HEDP·Na₄)

CAS No.: 29329-71-3 (x-Na), 3794-83-0 (4-Na)
Molecular Formula: C₂H₄O₇P₂Na₄
Dequest: 2016/2016DG
Molecular weight: 294

Items	Index
Appearance	White powder	Colorless to light yellow transparent liquid
Active component (HEDP) %	56.0min	20.3-21.7
Active component (HEDP·Na₄) %	79.9min	29.0-31.0
Total phosphoric acid (PO₄^3-) %	52.0-54.0	18.4-20.4
Fe (as Fe³⁺) (ppm)	35.0max	20max
Dry weight loss, %	15max	-
density (20℃) g/cm³	-	1.26-1.36
PH	11.0-12.0(1% water solution)	10.0-12.0(as it)

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