Description
Chemical Identity
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Chemical Name: Tetraethylenepentamine
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Abbreviation: TEPA
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Chemical Formula: C₈H₂₃N₅
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Molecular Weight: 189.3 g/mol
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CAS Number: 112-57-2
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EC Number: 203-986-2
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Structure: H₂NCH₂CH₂NHCH₂CH₂NHCH₂CH₂NHCH₂CH₂NH₂
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Synonyms: TEPA, N,N’-Bis(2-aminoethyl)ethylenediamine
Physical and Chemical Properties
| Property | Specification |
|---|---|
| Appearance | Clear to pale yellow liquid |
| Odor | Ammonia-like |
| Purity (TEPA content) | ≥ 97% |
| Boiling Point | ~340 °C (decomposes) |
| Melting Point | -30 °C |
| Viscosity (25°C) | ~200–250 cP |
| Density (20°C) | ~0.98 g/cm³ |
| Solubility | Completely miscible in water and alcohol |
| pH (1% solution) | Alkaline |
Key Applications of Tetraethylenepentamine (TEPA)
🧪 Epoxy Resin Curing Agent
TEPA is a highly effective curing agent for epoxy resins, providing excellent mechanical strength, chemical resistance, and durability in adhesives, coatings, and composites.
⚗️ Corrosion Inhibitors
It is widely used in oilfield corrosion inhibitors, especially in gas and crude oil pipelines, to prevent corrosion caused by acidic gases like CO₂ and H₂S.
💧 Chelating and Sequestering Agents
TEPA forms stable complexes with metal ions, making it ideal for chelating formulations in water treatment and industrial cleaning solutions.
🛢️ Fuel and Lubricant Additives
Used as an intermediate in the production of detergents and dispersants for engine oils and fuels, TEPA helps prevent sludge and deposit formation.
🌾 Agricultural Chemicals
It acts as a building block in pesticide and fungicide production and is occasionally used in fertilizer enhancers.
Handling and Safety
Tetraethylenepentamine is classified as corrosive and can cause severe skin burns and eye damage. It also has potential for sensitization and inhalation hazards. Always handle in a well-ventilated area using appropriate PPE, such as gloves, goggles, and respirators.
Storage: Store in tightly sealed containers away from strong oxidizers, acids, and sources of ignition. Keep in a cool, dry, and ventilated area.
Conclusion
Tetraethylenepentamine (TEPA) is a high-performance polyamine that plays a crucial role across multiple industrial sectors. Its unique chemical structure, featuring several reactive amine groups, enables its use in a wide array of formulations and synthesis processes. From epoxy curing to water treatment and lubricant additive production, TEPA is an indispensable ingredient for industries that demand performance, stability, and versatility.
