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

1-hüdroksüetülideen-1,1-difosfoonhape (HEDP)

CAS nr 2809-21-4

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Üksikasjalik tutvustus Read More About 1 hydroxy ethylidene 1 1 diphosphonic acid hedp1

CAS No. 2809-21-4

Molecular Formula: C₂H₈O₇P₂ Molekulmass: 206,02

Struktuurivalem:

Read More About corrosion scale inhibitor

Omadused:

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 näitab suurepärast katlakivi ja korrosiooni inhibeerivat toimet temperatuuril 250 ℃. HEDP on hea keemilise stabiilsusega kõrge pH väärtuse juures, raskesti hüdrolüüsitav ja raskesti lagunev tavalistes valgus- ja soojustingimustes. Selle happe/leelise ja kloori oksüdatsioonitaluvus on parem kui teistel fosfororgaanilistel hapetel (sool). 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.

Tahke olek 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.

Spetsifikatsioon:

Üksused	Indeks
Välimus	Selge värvitu kuni kahvatukollane vesilahus	Valge kristalne pulber
Aktiivne sisu (HEDP), %	58-62	90,0 min
Active content (HEDP·H₂O), %	-	98,0 min
Fosforhape (nagu PO₃^3-), %	2,0 max	0,8 max
Phosphoric acid (as PO₄^3-), %	0,8 max	0,5 max
Kloriid (nagu Cl^-)%	0,02 max	0,01 max
pH (1% vesilahus)	2,0 max	2,0 max
Tihedus (20 ℃), g/cm³	1,40 min	-
Fe, mg/l	20,0 max	10,0 max
Värv APHA (hazen)	40,0 max	-
Ca sekvestreerimine (mg CaCO₃/g)	500,0 min

Kasutamine:

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.

Pakendamine ja ladustamine:

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

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

Säilitatakse kaksteist kuud toas varjulises ja kuivas kohas.

Ohutus ja kaitse:

HEDP on happeline. Töötamise ajal pöörake tähelepanu töökaitsele. Vältida kokkupuudet silmade ja nahaga. Kui see satub kehale, loputage koheselt rohke veega.