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

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

【CAS】2809-21-4

Molecular Formula:C2H8O7P2                Molecular weight: 206.02

1, Properties

1-Hydroxy Ethylidene-1 HEDP is an organophosphoric acid corrosion inhibitor. It can chelate with Fe, Cu, and Zn etc. metal ions and form stable complex compound. It can dissolve the oxidized materials on these metals’ surfaces. Under  250℃ 1-Hydroxy Ethylidene-1 HEDP shows excellent scale and corrosion inhibition ability. 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,1-Hydroxy Ethylidene-1 HEDP has good antiscale and visible threshold effects. When built together with other water treatment chemicals, it shows good synergistic effects.

The solid of 1-Hydroxy Ethylidene-1 HEDP is high purity product, suitable for using in winter and freezing districts. it is quite suitable for using as cleaning agent in electronic fields and as additives in daily chemicals. 

2, 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-)% 1.0 max 0.8 max
Phosphoric acid  (asPO43- )% 0.6 max 0.5 max
Chloride (as Cl-) ppm 100.0 max 50.0max
pH (1% solution) 2.0 max 2.0 max
Density  (20℃)g/cm3 1.43-1.47 -
Fe,mg/L 10.0 max 5.0 max
Colour APHA (Hazen) 30.0 max -
Acetic acid % 0.5 max  
Ca sequestration (mg CaCO3/g) 500.0 min  

3,1-Hydroxy Ethylidene-1 HEDPApplication range&using method

1-Hydroxy Ethylidene-1 HEDP is widely used in the in circulating cool water system of electric power, chemical industry, metallurgy, fertilizer, etc. and widely used as a scale and corrosion inhibitor of low-pressure boilers, field waterflood, oil pipeline.

In light&textile industry,1-Hydroxy Ethylidene-1  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.

4,Package and Storage:

ATMP liquid: Normally In 30kg or 250kg net Plastic Drum;ATMP solid: 25kg inner liner polyethylene (PE) bag, outer plastic woven bag, or confirmed by clients request.Storage for ten months in room shady and dry place.

5,Safety Protection:

1-Hydroxy Ethylidene-1 HEDP is Acidity, Avoid contact with eye and skin, once contacted, flush with water.

HEDP    HEDP.Na    HEDP.Na2    HEDP.Na4    HEDP.Kx    2809-21-4    C2H8O7P2    1-Hydroxy Ethylidene-1

Corrosion inhibition Water treatment chemicals

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HEDP Producer Dongtao Chemical Co., Ltd. The company is committed to the field of specialty chemicals for water treatment and application development,professional production of water for industrial cooling water treatment agent scale and corrosion inhibitor,scale dispersants,fungicides,cement stripping visco agent,pre-film,dispersants,chelating agents and so on,are widely used in iron and steel,chemicals,power,textile,printing and dyeing,paper,petroleum, environmental protection,industrial water treatment industry and urban water supply and drainage applications.Over the years,with reliable products and quality service has won the majority of users trust and praise. Guided by the quality of the factory in order to survive,in good faith and development,services and efficient,management,will be dedicated to provide you with satisfied products.General manager,Xiaodong Kan,carrying all the staff to welcome old and new friends to cooperate here!
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