HEDP?--1-Hydroxy?Ethylidene-1,1-Diphosphonic?Acid?
CAS?No.? 2809-21-4?????????????????????????????????????
Molecular?Formula:???C2H8O7P2????????????????Molecular?weight:?206.02
Properties? of? HEDP:
HEDP?is?an?organophosphoric?acid?corrosion?inhibitor.?HEDP?can?chelate?with?Fe,?Cu,?and?Zn?ions?to?form?stabl e?chelating?compounds.HEDP?can?dissolve?the?oxidized?materials?on?these?metals'?surfaces.?HEDP?shows?excellent?scale?and?corrosion?inhibition?effects?under?temperature?250?C.?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,?HEDP?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,?HEDP?can?be?used?as?cleaning?agent?in?electronic?fields?and?as?additives?in?daily?chemicals.?
Specification?of?HEDP:
Appearance?
Colorless?or?light?yellow?transparent?liquid?
White?crystal?powder?
Active?content?(HEDP)%????58.0-62.0?89.0?min?
Phosphorous?acid?(as?PO33-)%??2.0?max?0.5?max?
Phosphoric?acid??(asPO43-?)%??0.8?max?0.5?max?
Chloride?(as?Cl-)%??????????0.01?max?0.01?max?
pH?(1%??solution)?????????????2?max?2?max?
Density??(20?C)g/cm3??????????1.40?-?
Fe?ion?ppm????????????????10?max?20?max?
Colour?APHA?(Hazen)??????????40?max?-
Usage?of? HEDP:
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?of?HEDP:
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?of?HEDP:
Acidity,?Avoid?contact?with?eye?and?skin,?once?contacted,?flush?with?water.
Keywords:?HEDP
Related?Products:??1-Hydroxy?Ethylidene-1,1-Diphosphonic?Acid?(HEDP)
?????????????????Monosodium?of?1-Hydroxy?Ethylidene-1,1-Diphosphonic?Acid?(HEDP.Na)
?????????????????Potassium?salt?of?1-Hydroxy?Ethylidene-1,1-Diphosphonic?Acid?(HEDP.Kx)
?????????????????Disodium?of?1-Hydroxy?Ethylidene-1,1-Diphosphonic?Acid?(HEDP.Na2)
?????????????????Tetra?sodium?of?1-Hydroxy?Ethylidene-1,1-Diphosphonic?Acid?(HEDP.Na4)
?
HEDP,?HEDP.Na5,HEDP.Kx,?HEDP.Na4,HEDP?Liquid,?HEDP?Powder,?HEDP?Solid,?HEDP?Salt,?HEDP?Sodium,?,1-Hydroxy?Ethylidene-1,1-Diphosphonic?Acid,Monosodium?of?1-Hydroxy?Ethylidene-1,1-Diphosphonic?Acid,Potassium?salt?of?1-Hydroxy?Ethylidene-1,1-Diphosphonic?Acid,Disodium?of?1-Hydroxy?Ethylidene-1,1-Diphosphonic?Acid,Tetra?sodium?of?1-Hydroxy?Ethylidene-1,1-Diphosphonic?Acid?