Hydroxyethylidene diphosphonic acid (HEDP)
CAS No. 2809-21-4
Alias: hydroxyethylidene diphosphonic acid, HEDPA,( 57300930,1-hydroxyethylidene) diphosphonic acid, 1-hydroxyethylidene-1,1-diphosphate
Molecular formula C2H8O7P2 Relative molecular mass: 206.02
1. performance and use
HEDP is an organic
phosphonic acid scale and corrosion inhibitor. It can form stable complexes
with various metal ions such as iron, copper and zinc, and can dissolve oxides
on metal surfaces. It can still play a good role in corrosion inhibition and
scale inhibition at 250 ° C. It is stable at high pH and is not easy to be
hydrolyzed. It is not easy to decompose under light and heat conditions. Acid
and alkali resistance and chlorine oxidation resistance are better than other
organic phosphonic acids (salts). It can form a six-ring chelate with metal
ions in water, especially calciumions, so it has better scale inhibition
effect and obvious solubility effect. When used in combination with other water
treatment agents, it shows ideal synergistic effect.
HEDP solids are high-purity products suitable for use in cold winters; they are especially suitable for cleaning agents and household chemicals in the electronics industry.
HEDP is widely used in industrial circulating cooling water systems such as electric power, chemical industry, metallurgy, chemical fertilizers, and scale and corrosion inhibition of medium and low pressure boilers, oilfield water injection and oil pipelines. In the textile industry, it can be used as a metal and non-metal cleaning agent. Peroxide stabilizer and fixing agent for bleaching and dyeing industry, complexing agent for cyanide-free electroplating industry, and carrier for radioactive elements in pharmaceutical industry.
2. technical indicators in line with GB/T 26324-2010 HG/T 3537-2010
3. the method of use
HEDP as a scale inhibitor generally uses a concentration of 1 ~ 10mg / L, as a corrosion inhibitor generally used concentration of 10-50mg / L; as a cleaning agent generally used concentration of 1000 ~ 2000mg / L; usually with polycarboxylic acid type scale inhibitor and dispersant use. When used in other industries, the amount should be determined according to the test.
4. packaging and storage
HEDP liquids are packed in plastic drums at 30Kg or 250Kg per barrel. HEDP solids are packed in plastic woven bags lined with polyethylene bags. The net weight of each bag is 25kg, which can also be determined according to user needs. Store in a cool, ventilated place indoors, protected from moisture, and stored for 12 months.
5. security protection
HEDP is acidic, pay attention to labor protection during operation, avoid contact with skin, eyes, etc., and rinse immediately with plenty of water after contact.
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Contact Person: Sally Sun