HEDP 50% 60% 90% Hydroxyls Ethylidene-1, 1-Diphosphonic Acid CAS 2809-21-41

HEDP Etidronic acid CAS 2809-21-4, The pure product is a white crystalline body. Easy to dissolve in water, soluble in methanol and ethanol, melting point 198-199 ℃, HEDP Etidronic acid CAS 2809-21-4 is a colorless to pale yellow viscous transparent liquid; It is a polybasic acid that is easily soluble in water and an important chelating agent. Its structure is stable and not easily hydrolyzed, and it does not decompose under general photothermal conditions. HEDP is commonly used as a chelating agent, water quality stabilizer, masking agent, extractant, etc. It is widely used in circulating cooling water, boiler water, oilfield water injection, and oil pipeline anti-corrosion and scaling prevention.

1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP) is a cathodic corrosion inhibitor, which has a corrosion inhibition rate about four times higher than inorganic polymeric phosphates. HEDP, when used in combination with other corrosion and scale inhibitors such as chromate, polyphosphate, molybdate, silicate, zinc salt, polycarboxylate and their derivatives, has a synergistic effect and can enhance drug efficacy. Due to strict control of emission standards for chromium and phosphate by environmental protection departments, low phosphorus or phosphate free agents are used in both circulating cooling water systems and boiler systems, with HEDP being commonly used in low phosphorus agents The dosage is generally less than 1-3 ppm.