HEDP Hydroxy ethylidene diphosphonic acid

HEDP 1-Hydroxy Ethyidene-1,1-Diphosphonic Acid[CAS] 2809-21-4 Alias: 1-Hydroxy Ethyidene-1,1-Diphosphonic Acid Dequest:2010 Molecular Formula:C2H8O7P2 Molecular weight:206.02 1, Properties HEDP is an oranophosphoric 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 metal,surfaces.Under 250°C 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 , HEDP has good antiscale and visible threshold effects.When built together with other water teatment chemicals,it shows good synergistic effects. The solid of HEDP is high purity productj,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 conform to HG/T 3537-1999 I temsindex HG/T 3537-1999Appearance Colorless or light yellow transparent liquidWhite crystal powderActive content (HEDP)% ≥ 50.060.089.0Phosphorous acid (as PO33-)%≤ 2.02.00.80Phosphorous acid (as PO43-)% ≤ 0.80.80.50Chloride (as CL-)% ≤ 1.01.00.10Ph (1% solution ) ≤ 222.0Density(20°C)g/ cm3 ≥ 1.341.40—Fe ion ppm≤ 10105.0Active content(as HEDP- H2O)≥ —98.0Ca sequestration mg/g ≥ 450500 — 3,Application range & using method HEDP is widely used in the in circulating cool water sustem of electric power,chemical industry ,metallurgy,fertilizer,etc.and widely used s a scale and corrosion inhibitor of low-pressure boilers,field waterflood,oil pipeline. In light&textile industry , HEDP is used as detergent for metal and nonmeta.In dyding industry , HEDP is used as peroxide stabilizer and dye-fixing agent; In non-cyanide electroplating , HEDP is used as chelating agent,.The dasage of 1-10mg/L is prefer. red as scale inhibitor10-50mg/L as corrosion inhibitor, and 1000-2000mg/L as detergent.Usually , HEDP is used together with polycarboxylic acid. 4, Pacage and Storage: HEDP liquid:Normally In 30kg or 250kg net Plastic Drum; HEDP silid:25kg inner liner polyethylene(PE) bag,outer plastic woven bag,or confirmed by client request. Storage for ten months in room shady and dry place. 5, Safety Protection HEDP is Acidity,Avoid contact with eye and skin,once contacted,flush with water.