标题：HEDP
羟基亚乙基二膦酸
英文名称及简写：1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP)
别名：羟基亚乙基二膦酸、HEDPA、(1-羟基亚乙基)二膦酸、1-羟基亚乙基-1,1-二磷酸  
CAS No. 2809-21-4 
分子式 C2H8O7P2 
相对分子质量：206.02 
结构式
一、产品特性：
HEDP是一种有机膦酸类阻垢缓蚀剂，能与铁、铜、锌等多种金属离子形成稳定的络合物，能溶解金属表面的氧化物。在250℃下仍能起到良好的缓蚀阻垢作用，在高pH下仍很稳定，不易水解，一般光热条件下不易分解。耐酸碱性、耐氯氧化性能较其它有机膦酸（盐）好。可与水中金属离子，尤其是钙离子形成六圆环螯合物，因而具较好的阻垢效果并具明显的溶限效应，当和其它水处理剂复合使用时，表现出理想的协同效应。 HEDP固体属于高纯产品，适用于冬季严寒地区；特别适用于电子行业的清洗剂和日用化学品添加剂。 HEDP具有良好的化学稳定性，药剂用量小，并兼具缓蚀和阻垢效果的特点，药剂自身基本无毒，无公害污染，此外，它们在电镀行业，金属表面处理，过氧化氢稳定，金属离子掩蔽等方面都有不少新的用途。
二、技术要求： 
符合  HG/T3537-1999
外     观无色或淡黄色透明液体 无色或淡黄色透明液体 白色晶状固体活性组分（以HEDP计）％ ≥ 50.060.090.0亚磷酸（以PO3计）% ≤ 2.02.00.80磷酸（以PO4计）% ≤ 0.80.80.50氯化物 (以Cl计)% ≤ 1.01.00.10PH值（1％水溶液） ≤ 2.02.02.0密度（20℃）g/cm≥1.34 1.40—— 铁离子（以Fe计），ppm   ≤10.010.05.0活性组分(以HEDP·H2O计) % ≤—— —— 98.0
三、HEDP应用范围与使用方法
HEDP广泛应用于电力、化工、冶金、化肥等工业循环冷却水系统及中、低压锅炉、油田注水及输油管线的阻垢和缓蚀；HEDP在轻纺工业中，可以作金属和非金属的清洗剂，漂染工业的过氧化物稳定剂和固色剂，无氰电镀工业的络合剂。HEDP作阻垢剂一般使用浓度1~10mg/L，作缓蚀剂一般使用浓度10~50mg/L；作清洗剂一般使用浓度1000~2000mg/L；通常与聚羧酸型阻垢分散剂复配使用。 HEDP包装与贮存
HEDP液体用塑料桶包装，每桶30Kg或250Kg；HEDP固体用内衬聚乙烯袋的塑料编织袋包装，每袋净重25kg，也可根据用户需要确定。贮于室内阴凉通风处，防潮，贮存期十个月。
HEDP安全防护
HEDP为酸性，应避免与眼睛、皮肤接触，一旦溅到身上，应立即用大量清水冲洗。
HEDP包装与贮存
塑料桶包装，每桶30kg或250kg，贮存于室内阴凉处，贮存期十个月。
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1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP)
CAS No. 2809-21-4 Dequest:2010 
Molecular Formula: C2H8O7P2 Molecular weight: 206.02 
Properties:
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℃. 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:
itemsindexAppearanceColorless or light yellow transparent liquidWhite crystal powderActive content（HEDP）％ 58.0-62.089.0 minPhosphorous acid（as PO3）%2.0 max0.5 maxPhosphoric acid （asPO4 ）%0.8 max0.5 maxChloride (as Cl)%0.01 max0.01 maxpH（1％ solution）2 max2 maxDensity （20℃）g/cm1.40—Fe ion ppm 10 max20 maxColour 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. 
Package and Storage:
HEDP liquid: Normally In 250kg net Plastic Drum, IBC drum can also be used as required HEDP solid: 25kg inner liner polyethylene (PE) bag, outer plastic woven bag, or confirmed by clients. 
Storage for ten months in room shady and dry place. 
Safety Protection:
Acidity, Avoid contact with eye and skin, once contacted, flush with water.　
OTHER
the UN NO.of HEDP is 3265
Keywords: HEDP China,Scale inhibitor,1-Hydroxy Ethylidene-1,1-Diphosphonic Acid(HEDP)
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