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

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

CAS br. 2809-21-4

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Detalji

Oznake

Detaljan uvod Read More About 1 hydroxy ethylidene 1 1 diphosphonic acid hedp1

CAS No. 2809-21-4

Molecular Formula: C₂H₈O₇P₂ Molekulska težina: 206,02

Strukturna formula:

Read More About corrosion scale inhibitor

Svojstva:

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 pokazuje odlične efekte inhibicije kamenca i korozije na temperaturi od 250℃. HEDP ima dobru hemijsku stabilnost pri visokoj pH vrednosti, teško se hidrolizira i teško se razlaže pod normalnim svetlosnim i toplotnim uslovima. Njegova tolerancija na oksidaciju kiselina/alkalija i hlora je bolja nego kod drugih organofosfornih kiselina (soli). 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.

Čvrsto 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	Indeks
Izgled	Bistra, bezbojna do blijedožuta vodena otopina	Bijeli kristalni prah
Aktivni sadržaj (HEDP), %	58-62	90.0 min
Active content (HEDP·H₂O), %	-	98.0 min
Fosforna kiselina (kao PO₃^3-), %	2,0 max	0,8 max
Phosphoric acid (as PO₄^3-), %	0,8 max	0,5 max
Hlorid (kao Cl^-)%	0,02 max	0,01 max
pH (1% vodeni rastvor)	2,0 max	2,0 max
Gustina (20℃), g/cm³	1.40 min	-
Fe, mg/L	20,0 max	10,0 max
Boja APHA (Hazen)	40,0 max	-
Sekvestracija Ca (mg CaCO₃/g)	500,0 min

Upotreba:

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.