Description

Ethylenebis[Nitrilobis(Methylene)]Tetrakisphosphonic Acid, Sodium Salt is a high-performance phosphonate-based chelating agent and scale inhibitor. This compound is valued for its exceptional ability to sequester di- and trivalent metal ions, such as calcium, magnesium, and iron, under demanding conditions. It is essential for industries requiring robust water treatment, mineral processing, and detergent formulations where stability and performance are critical.

Application

• Industrial Water Treatment: Primary application as a highly effective scale and corrosion inhibitor in cooling water systems, boilers, and reverse osmosis membranes.
• Detergent & Cleaning Formulations: Acts as a powerful builder and sequestrant to enhance cleaning efficiency by inactivating water hardness ions.
• Pulp & Paper Industry: Used in bleaching processes to stabilize peroxides and chelate metal ions that can degrade pulp quality.
• Textile Processing: Serves as a chelant in dyeing and bleaching baths to prevent metal-ion interference and improve color fastness.
• Oilfield Applications: Employed in scale control for production wells and pipelines to prevent mineral deposits.
• Personal Care Products: Incorporated as a stabilizing agent in formulations such as shampoos and liquid soaps.

Basic Information

Product Name	Ethylenebis[Nitrilobis(Methylene)]Tetrakisphosphonic Acid, Sodium Salt
CAS No.	22036-77-7
Molecular Formula	C6H12N2O12P4Nan (n=4-6, typical)
Molecular Weight	~ 500-600 g/mol (as sodium salt mixture)
Synonyms	Ethylenediamine tetra(methylene phosphonic acid) sodium salt; EDTMP•Na; Ethylenediaminetetramethylenephosphonate sodium salt; Dequest® 2041 (Trade Name); ENTMP•Na; EDTMPA-Na; 1,2-Ethanediamine, N,N,N',N'-tetrakis(methylenephosphonic acid), sodium salt; PBTC-related phosphonate.
EINECS	244-728-3

Quality Control

Our Ethylenebis[Nitrilobis(Methylene)]Tetrakisphosphonic Acid, Sodium Salt is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure consistent purity, active content, and performance. Certificates of Analysis (COA) detailing key parameters such as assay, pH, and phosphonate content are available upon request to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). This product is hygroscopic (moisture-sensitive); ensure containers are sealed immediately after use to prevent absorption of atmospheric moisture which may lead to caking or reduced efficacy.

Specification

Item	Specification
Appearance	Clear to slightly yellow aqueous solution
Active Content (as acid)	≥ 50.0 %
pH (1% aqueous solution)	6.0 - 8.0
Density (20°C)	1.30 - 1.40 g/cm³
Identification (IR)	Conforms
Iron (Fe)	≤ 10 ppm
Chloride (Cl)	≤ 0.1 %

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.