98% HEDP Powder CAS 2809‑21‑4 Water Treatment Scale & Corrosion Inhibitor

98% HEDP Powder CAS 2809‑21‑4 

Water Treatment Scale & Corrosion Inhibitor

CAS No: 2809‑21‑4

Synonyms: HEDP, Etidronic Acid, 1‑Hydroxy Ethylidene‑1,1‑Diphosphonic Acid

Appearance: White crystalline solid (98% powder grade)

Molecular Formula: C₂H₈O₇P₂

Molecular Weight: 206.03

Structural Formula: 

Product Overview

1‑Hydroxyethylidene‑1,1‑Diphosphonic Acid, short name **HEDP**, also known as Etidronic Acid, CAS 2809‑21‑4. Our SINOBIO 98% HEDP is high‑purity white crystalline powder organophosphonic acid water‑treatment chemical.

Solid 98% HEDP is especially suitable for cold‑climate regions compared with liquid HEDP 50‑60%. It can form stable six‑membered ring chelate complexes with calcium, iron, copper, zinc and other metal ions in water. It possesses threshold scale‑inhibition effect and good corrosion‑inhibition performance, stable under high‑temperature, high‑pH and chlorine‑containing water environments. Widely adopted in circulating cooling water, boiler, oilfield injection water, textile dyeing, non‑cyanide electroplating, metal cleaning and fine‑chemical industries. Factory strict batch‑to‑batch quality control, available for bulk order and small trial sample.

Core Product Advantages

1. Excellent high‑temperature stability: 

Maintain scale‑inhibition & corrosion‑inhibition performance up to 250°C, fit boiler and oilfield high‑temperature working condition.

2. Strong anti‑oxidation & pH tolerance: 

Resist hydrolysis, chlorine oxidation, stable in wide acid‑alkaline range, better performance than common organophosphorus agents.

3. Powerful metal chelating & threshold effect: 

Form stable chelate with Ca²⁺, Fe³⁺, Cu²⁺, suppress calcium‑carbonate scale deposition; dissolve metal oxide layers on equipment surface.

4. Good synergistic compatibility: 

Can compound with polycarboxylate, zinc salt, BTA and other water‑treatment reagents to improve comprehensive treatment efficiency.

5. Solid‑powder form logistics benefit: 

98% high‑concentration solid powder, greatly reduce freight cost for long‑distance export, suitable for cold‑area storage and usage.

6. Multi‑industry versatility: 

Not limited to water‑treatment; also usable for textile peroxide stabilizer, non‑cyanide electroplating chelator, metal cleaning agent, fine‑chemical auxiliary raw‑material.

Wide Application Fields

1. Industrial Circulating Cooling Water & Boiler Water Treatment

Scale and corrosion inhibitor for power plant, chemical plant, metallurgy and fertilizer factory circulating cooling‑water, low‑pressure boiler water and oilfield injection‑water. Inhibit calcium salt scale deposition, reduce pipeline & heat‑exchanger corrosion, lower equipment maintenance frequency.

2. Oilfield Production System

Applied in oil‑field injection water and gathering pipeline system; control scale formation under high‑temperature & high‑salinity oil‑field water quality environment.

3. Textile Printing & Dyeing Industry

Act as peroxide stabilizer in bleaching process, prevent peroxide decomposition; work as metal‑ion masking agent to avoid fabric discoloration caused by heavy‑metal impurities.

4. Non‑Cyanide Electroplating Industry

High‑efficiency chelating agent for eco‑friendly non‑cyanide electroplating bath, improve coating uniformity and adhesion performance.

5. Metal & Non‑Metal Cleaning Agent

Remove rust and oxide scale for metal surface cleaning formula; will not cause excessive substrate corrosion after pickling treatment.

6. Other Fine‑Chemical Fields

Used as raw‑material for electronic cleaning agent, daily‑chemical additive and pharmaceutical radioactive‑element carrier.