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

1-hydroksyetyliden-1,1-difosfonsyre (HEDP)

CAS nr. 2809-21-4

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Detaljert introduksjon Read More About 1 hydroxy ethylidene 1 1 diphosphonic acid hedp1

CAS No. 2809-21-4

Molecular Formula: C₂H₈O₇P₂ Molekylvekt: 206,02

Strukturformel:

Read More About corrosion scale inhibitor

Egenskaper:

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 viser utmerket skala og korrosjonshemmende effekter under temperatur 250 ℃. HEDP har god kjemisk stabilitet under høy pH-verdi, vanskelig å hydrolyseres, og vanskelig å brytes ned under vanlige lys- og varmeforhold. Dens syre/alkali- og kloroksidasjonstoleranse er bedre enn andre organofosforsyrer (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, it shows good synergistic effects.

Den solide tilstanden til 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.

Spesifikasjon:

Varer	Indeks
Utseende	Klar, fargeløs til blekgul vandig løsning	Hvitt krystallpulver
Aktivt innhold (HEDP), %	58-62	90,0 min
Active content (HEDP·H₂O), %	-	98,0 min
Fosforsyre (som PO₃^3-), %	2,0 maks	0,8 maks
Phosphoric acid (as PO₄^3-), %	0,8 maks	0,5 maks
Klorid (som Cl^-)%	0,02 maks	0,01 maks
pH (1 % vannløsning)	2,0 maks	2,0 maks
Tetthet (20℃), g/cm³	1.40 min	-
Fe, mg/L	20,0 maks	10,0 maks
Farge APHA (hazen)	40,0 maks	-
Ca-sekvestrering (mg CaCO₃/g)	500,0 min

Bruk:

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.

Emballasje og oppbevaring:

HEDP liquid: 200L plastic drum,IBC(1000L),customers’ requirement.

HEDP solid: 25kg/bag,customers’ requirement.

Lagring i tolv måneder på et skyggefullt og tørt sted.

Sikkerhet og beskyttelse:

HEDP er surt. Vær oppmerksom på arbeidsbeskyttelse under drift. Unngå kontakt med øyne og hud. Hvis det spruter på kroppen, skyll umiddelbart med mye vann.