羟基乙叉二膦酸

1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP)
2809-21-4

山东更新日期：2011-05-24

ZaoZhuang XinTai WaterTreatment Technology Co., Ltd.

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联系人：Sophia

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产品详情:

中文名称：: 羟基乙叉二膦酸

英文名称：: 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP)

CAS号：: 2809-21-4

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 shows excellent scale and corrosion inhibition effects under temperature 250 centigrade. HEDP has good chemical stability under high pH value, hard to be hydrolyzed, and hard to be decomposed under ordinary light and heat conditions. Its acid/alkali and chlorine oxidation tolerance are better than that of other organophosphoric acids (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.

The solid state of 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.

Specification:

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items

index

Appearance

Colorless or light yellow transparent liquid

White crystal powder

Active content（HEDP）％

58.0-62.0

89.0 min

Phosphorous acid（as PO₃^3-）%

2.0 max

0.5 max

Phosphoric acid （asPO₄^3- ）%

0.8 max

0.5 max

Chloride (as Cl^-)%

0.01 max

pH（1％ solution）

2 max

Density （20℃）g/cm³

1.40

—

Fe ion ppm

10 max

20 max

Colour APHA (Hazen)

40 max

—

Usage:

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.

HEDP China,Scale inhibitor,1-Hydroxy Ethylidene-1,1-Diphosphonic Acid(HEDP)