Aminoethylpiperazine
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| UN number | 2815 |
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| Appearance | Colourless to yellowish liquid |
| Density | 0.984 g/cm3 at 20 °C |
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| Vapor pressure | 0.076 mmHg @ 20 °C |
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Aminoethylpiperazine (AEP) is a derivative of piperazine. This ethyleneamine contains three nitrogen atoms; one primary, one secondary and one tertiary. It is a corrosive organic liquid and can cause second or third degree burns. Aminoethylpiperazine can also cause pulmonary edema as a result of inhalation. It is REACH and TSCA registered.[1]
Production
Ethylene dichloride is reacted with ammonia as a main method of production. This process produces various ethylene amines which can then be purified by distillation. These include ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, other higher homologues and aminoethyl piperazine. [2][3] AEP is also manufactured by reacting ethylenediamine or ethanolamine/ammonia mixtures over a catalyst.
Epoxy resin curing agent
A key use of AEP is as an epoxy curing agent.[4] When used as an epoxy resin curing agent, it is usually used in conjunction with other amines as an accelerator as it only has 3 amine hydrogens for cross-linking. The tertiary amine on the molecule acts as an accelerator and the other three amine hydrogens allow sites for crosslinking the epoxy.[5] This then allows coating systems to be formulated that prevent corrosion of steel and other substrates.[6] Novolac resins may also be cured by this material and blends.[7]
Other uses
Uses include inhibition of corrosion, surface activation, and as an asphalt additive. As AEP is alkaline and carbon dioxide is weakly acidic, it has been researched as a carbon dioxide sequestrant.[8] This is part of ongoing research in Carbon capture and storage.[9][10]
Toxicology
The toxicology has been extensively studied and is well understood.[11][12]
See also
References
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- ↑ Howarth G.A "Synthesis of a legislation compliant corrosion protection coating system based on urethane, oxazolidine and waterborne epoxy technology" Master of Science Thesis April 1997 Imperial College London
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