Overview
N,N'-Bis(3-aminopropyl)ethylenediamine, commonly referred to as tetraethylenepentamine (TEPA), is a versatile polyamine compound with a wide range of industrial applications. It is a member of the ethyleneamine family, characterized by multiple amine groups that impart high reactivity and chelating properties. This compound is primarily used as an intermediate in chemical synthesis, particularly in the production of epoxy curing agents and chelating agents. Its ability to form stable complexes with metal ions makes it valuable in water treatment and corrosion inhibition applications.
Physical and Chemical Properties
TEPA is a colorless to pale yellow viscous liquid with a strong amine odor. It has a molecular weight of 189.30 g/mol and a density of 0.99 g/cm³ at 20°C. The compound is highly soluble in water and most organic solvents, including ethanol and acetone. Chemically, TEPA is a polyfunctional amine, featuring five nitrogen atoms that contribute to its high reactivity. It exhibits strong chelating properties, forming stable complexes with metal ions. The compound is hygroscopic and should be stored under anhydrous conditions to prevent moisture absorption.
Main Applications
TEPA is widely used as an epoxy curing agent, where it reacts with epoxy resins to form durable, cross-linked polymers. These cured resins are used in coatings, adhesives, and composites for industries such as automotive, aerospace, and construction. In water treatment, TEPA serves as a chelating agent to remove heavy metal ions from industrial wastewater. It is also employed as a corrosion inhibitor in cooling systems and boilers. Additionally, TEPA finds use in textile auxiliaries, paper chemicals, and as an intermediate in the synthesis of surfactants and pharmaceuticals.
Safety and Storage
TEPA is classified as a corrosive substance and can cause severe skin and eye irritation. Proper personal protective equipment (PPE), including gloves, goggles, and chemical-resistant clothing, should be worn when handling this compound. Inhalation of vapors should be avoided by working in well-ventilated areas or using respiratory protection. Storage recommendations include keeping the compound in tightly sealed containers made of polyethylene or stainless steel, away from oxidizing agents and acids. The storage area should be cool, dry, and well-ventilated, with temperatures not exceeding 30°C to prevent degradation.
B2B Procurement Guide
When procuring TEPA for industrial use, buyers should verify the CAS number (112-57-2) to ensure product authenticity. Specifications such as purity (typically 95-99%), moisture content, and amine value should be confirmed with suppliers. Bulk procurement in drums or intermediate bulk containers (IBCs) may offer cost savings. Buyers should evaluate supplier reliability, lead times, and transportation options, especially for international shipments. Technical support and quality certifications (e.g., ISO) from suppliers can be valuable for specialized applications.
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