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

1-hidroksi etiliden-1,1-difosfonska kislina (HEDP)

Št. CAS 2809-21-4

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CAS No. 2809-21-4

Molecular Formula: C₂H₈O₇P₂ Molekulska masa: 206,02

Strukturna formula:

Read More About corrosion scale inhibitor

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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 kaže odlične učinke zaviranja lestvice in korozije pri temperaturi 250 ℃. HEDP ima dobro kemično stabilnost pri visoki pH vrednosti, težko se hidrolizira in težko razgradi pod običajnimi svetlobnimi in toplotnimi pogoji. Njegova toleranca na kisline/alkalije in oksidacijo klora je boljša kot pri drugih organofosfornih kislinah (sol). 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.

Trdno stanje 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.

Specifikacija:

Predmeti	Kazalo
Videz	Bistra, brezbarvna do bledo rumena vodna raztopina	Bel kristalni prah
Aktivna vsebnost (HEDP), %	58-62	90,0 min
Active content (HEDP·H₂O), %	-	98,0 min
Fosforna kislina (kot PO₃^3-), %	2,0 maks	0,8 maks
Phosphoric acid (as PO₄^3-), %	0,8 maks	0,5 maks
Klorid (kot Cl^-)%	0,02 maks	0,01 maks
pH (1% vodna raztopina)	2,0 maks	2,0 maks
Gostota (20℃), g/cm³	1.40 min	-
Fe, mg/L	20,0 maks	10,0 maks
Barva APHA (Hazen)	40,0 maks	-
Sekvestracija Ca (mg CaCO₃/g)	500,0 min

Uporaba:

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.