Abbreviation: TEDA, DABCO
English name: TRIETHYLENEDIAMINE
Chemical formula: C6H12N2
Physical and chemical properties
TEDA is normally a colorless or white crystal. It is easily absorbed in the air and is deliquescent and agglomerated. It is alkaline and absorbs CO2 in the air and yellows. Soluble in acetone, benzene and ethanol. Pure TEDA is very toxic. Inhalation of saturated TEDA vapor can cause mild mucosal irritation, damage to the eyes, and irritating skin can cause allergies.
Relative density (25 ° C): about 1.14
Pure product melting point: 158-159 ° C
Flash point: 60 ° C
Boiling point: 174 ° C, easy sublimation, slightly ammonia
Vapor pressure: about 67Pa at 21°C, 533Pa at 50°C, and 7.7kPa at 100°C
System of law
There are several methods for synthesizing TEDA at home and abroad. The general process is to pass an aqueous solution of an amine or an alcohol amine raw material through a reactor packed with a catalytic zeolite at a certain flow rate, and react at 320-400 ° C and 0.3 MPa to purify. , get TEMA.
The use of piperazine and its derivatives to prepare TEDA has high efficiency and mature technology to achieve industrialization. However, in China, piperazine and its derivatives have small yield and high price, and ethanolamine is used as raw material to produce TEDA. The supply is sufficient, the operation is simple, the cost is low, and industrialization in Japan is feasible in China.
Characteristics and uses
Triethylenediamine is a dicyclic heterocyclic tertiary amine compound mainly used as a gel catalyst for polyurethane foams, and is widely used in soft, semi-rigid, rigid polyurethane foams, elastomers, and, moreover, It can be used for an epoxy resin curing catalyst, an ethylene polymerization catalyst, a propylene catalyst, an acrylonitrile polymerization catalyst, and an ethylene oxide polymerization catalyst.