羟基乙叉二膦酸（HEDP）
1-Hydroxy Ethylidene-1,1-Diphosphonic Acid
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
分子式： C2H8O7P2 相对分子质量： 206.02
Molecular formula: C2H8O7P2 Relative molecular weight: 206.02
CASNo. 29329-71-3
结构式：
Structural formula:
1、 产品性能Product Performance
在高温、高PH值下仍很稳定，低毒无害。在200℃温度下有良好的阻垢作用，250℃以上才分解，耐酸碱，能同铁、铜、钙、镁、铝、锌等多种金属形成稳定的整合物。因此，可用于氰电镀，由于能溶解金属表面的氧化物，所以可用于清洗锅炉和管道中铁锈和无机盐垢。本产品耐氯气，氧化性能较一般的有机磷酸盐好。是一种优良的阻垢剂、无氰电镀络合剂、金属清洗剂。
HEDP remains stable under high temperature and high pH value, low toxic and harmless. It has good anti-scale effect under 200℃, and only decomposes at above 250℃. It resists acid and alkali, and can chelate with Fe, Cu, Ca, Mg, Al and Zn ions to form stable compounds. Hence, it can be used in cyanide electroplating. It can dissolve the oxidized materials on metal surfaces, so it can be used to clean iron rust and inorganic scale of the boiler and pipelines. It is chlorine-resistant and has a better oxidation performance than ordinary organic phosphates. HEDP is a good scale inhibitor, non-cyanide electroplating agent and metal cleaning agent.
2、应用范围 Application scope
广泛用于电力、化学、冶金、化肥等工业循环冷却水系统，锅炉、换热器水管、油田注水管及输油管线的阻垢剂和缓蚀剂，在轻纺工业中，可以作金属和非金属的清洗剂，电镀工业的螯合剂，漂染工业的稳定剂和固定剂。
HEDP is widely used in circulating cool water system, boiler, heat exchanger water pipelines, oilfield water injection pipeline and oil transmission pipeline, as scale and corrosion inhibitor, in fields such as power plant, chemical industry, metallurgy, fertilizer, etc. In light and textile industry, it is used as detergent for metal and non-metal. In electroplating industry, it is used as chelating agent. In dyeing industry, it is used as stabilizer and dye-fixing agent.
3、质量标准Quality index
外观：无色至淡黄色透明液体，无沉淀。
Appearance: clear or clear yellow transparent liquid, no sediment.
| 项目名称 Item name | 指标 Index |
| 优等品 Premium | 一等品 First rate | 合格品 Qualified |
| 活性组分（以ATMP计）： ≥ Active component （as ATMP）: ≥ | 58 | 50 | 50 |
| 亚磷酸（以PO33-计）含量％ ≤ Phosphorous acid （as PO33-） % ≤ | 1.0 | 2.0 | 3.0 |
| 磷酸（以PO43-计）含量％ ≤ Phosphoric acid （PO43-） % ≤ | 0.5 | 0.8 | 1.0 |
| 氯化物（以C1-计）含量：％ ≤ Chloride （as Cl-）: % ≤ | 0.3 | 0.5 | 1.0 |
| PH值（1％水溶液） ≤ Ph value （1% water solution） ≤ | 2.0 | 2.0 | 2.0 |
| 密度：（20℃）g/cm3 ≥ Density （20℃） g/cm3 ≥ | 1.40 | 1.34 | 1.34 |
| 钙螯合值mg CaCO3/g ≥ Ca Chelating ability mg CaCO3/g ≥ | 500 | 450 | 450 |
| 铁（以Fe3+计）含量 ppm ≤ Fe （as Fe3+） ppm ≤ | 10 | 10 | 25 |
4、使用方法 Usage
作为阻垢剂使用，投加量一般2-8ppm，作为缓蚀剂使用，投加量一般为50-80ppm，与其它水稳剂复合使用时，投加量一般为2-4ppm
When used as scale inhibitor, the dosage 2-8 ppm is preferred; When used as corrosion inhibitor, the dosage 50-80 ppm is preferred; When used together with other water stabilizers, the dosage 2-4 ppm is preferred.
5、包装与贮存 Packing and storage Packing and storage
本品采用聚乙烯塑料桶包装，每桶净重250kg，或采用内衬聚乙烯塑料薄膜的铁桶包装，每桶净重200kg，运输时防止曝晒，贮存在干燥通风的库房内，贮存期10个月。
Pack in 250kg net polyethylene （PE） plastic drum, or in 200kg net iron bucket with polyethylene （PE） inner-lining. Avoid insolation during transportation. Be stored for ten months in room ventilated and dry place.
