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

Nombor CAS 2809-21-4

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CAS No. 2809-21-4

Molecular Formula: C₂H₈O₇P₂ Berat molekul: 206.02

Formula Struktur:

Read More About corrosion scale inhibitor

sifat:

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 menunjukkan skala yang sangat baik dan kesan perencatan kakisan di bawah suhu 250 ℃. HEDP mempunyai kestabilan kimia yang baik di bawah nilai pH yang tinggi, sukar untuk dihidrolisiskan, dan sukar untuk diuraikan dalam keadaan cahaya dan haba biasa. Toleransi pengoksidaan asid/alkali dan klorinnya lebih baik daripada asid organofosforik (garam) yang lain. 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.

Keadaan pepejal bagi 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.

Spesifikasi:

barang	Indeks
Penampilan	Larutan akueus jernih, Tidak berwarna hingga kuning pucat	Serbuk kristal putih
Kandungan aktif (HEDP), %	58-62	90.0 min
Active content (HEDP·H₂O), %	-	98.0 min
Asid fosforus (sebagai PO₃^3-), %	2.0 maks	0.8 maks
Phosphoric acid (as PO₄^3-), %	0.8 maks	0.5 maks
Klorida (sebagai Cl^-)%	0.02 maks	0.01 maks
pH (larutan air 1%)	2.0 maks	2.0 maks
Ketumpatan (20℃), g/cm³	1.40 min	-
Fe, mg/L	20.0 maks	10.0 maks
Warna APHA (Hazen)	40.0 maks	-
Penyerapan Ca (mg CaCO₃/g)	500.0 min

penggunaan:

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.

Pembungkusan dan penyimpanan:

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

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

Penyimpanan selama dua belas bulan di dalam bilik yang teduh dan kering.

Keselamatan dan perlindungan:

HEDP adalah berasid. Beri perhatian kepada perlindungan buruh semasa operasi. Elakkan terkena mata dan kulit. Jika ia memercik pada badan, segera bilas dengan air yang banyak.