1-Hydroxyethylidene-1,1-Diphosphonic Acid(HEDP) CAS 2809-21-4
Category:
Product Description
Product Details
Introduction
1-Hydroxyethylidene-1,1-diphosphonic acid is referred to as HDEP, also known as Etidronic acid or etidronate.
HEDP is an organic phosphonic acid scale and corrosion inhibitor that can form stable complexes with various metal ions such as iron, copper, and zinc, and can dissolve oxides on the metal surface. It can still play a good role in corrosion and scale inhibition at 250°C, is still very stable at high pH, is not easy to hydrolyze, and is not easy to decompose under general light and heat conditions. It has better acid and alkali resistance and chlorine oxidation resistance than other organic phosphonic acids (salts). It can form a six-ring chelate with metal ions in water, especially calcium ions, so it has a good scale inhibition effect and a significant solubility limit effect. When used in combination with other water treatment agents, it shows an ideal synergistic effect.
HEDP solid is a high-purity product, suitable for areas with severe winter cold; especially suitable for cleaning agents and daily chemical additives in the electronics industry.
Specification
| Appearance | Light yellow transparent liquid | Light yellow transparent liquid | White crystal powder |
| Active ingredients(HEDP) | ≥50.0% | ≥60.0% | -- |
| Active ingredients(HEDP*H2O) | -- | -- | ≥97.0% |
Phosphorous acid (as PO33-) | ≤2.0% | ≤2.0% | ≤0.8% |
Phosphoric acid (as PO43-) | ≤0.8% | ≤0.8% | ≤0.5% |
pH value (1% solution) | 1.5-2.0 | 1.5-2.0 | 1.5-2.0 |
Density | ≥1.36g/cm3 | ≥1.40g/cm3 | -- |
Chloride (as Cl-) | ≤0.02% | ≤0.02% | ≤0.01% |
Iron (as Fe2-) | ≤20mg/L | ≤20mg/L | ≤10mg/L |
Calcium chelation value | ≥450mg/g | ≥500mg/g | -- |
Application:
HEDP is widely used in industrial circulating cooling water systems such as electric power, chemical industry, metallurgy, fertilizer, etc., as well as scale and corrosion inhibition for medium and low pressure boilers, oil field water injection and oil pipelines; in the textile industry, it can be used as a cleaning agent for metals and non-metals, a peroxide stabilizer and color fixer in the bleaching and dyeing industry, a complexing agent in the cyanide-free electroplating industry, and as a carrier of radioactive elements in the pharmaceutical industry.
Electronic grade HEDP is a high-purity product with strong metal ion chelating ability. It can improve grinding efficiency and smoothness in the grinding, polishing, etching and other processes of semiconductor processing. It can reduce burrs and improve the surface smoothness of copper foil when used in the etching process of display panels and PCB boards.
Package: 30, 250kg/drum, 25kg/bag
Keyword:
Send Inquiry
Leave a message immediately and receive free product consultation. We will arrange experts to contact you as soon as possible.