For the physical and chemical properties of triethanolamine, see ethanolamine. Its main physical property data are as follows: melting point 21.2ºC, boiling point 360.0ºC, 227ºC (20kPa), relative density (20/4ºC) 1.1242, dynamic viscosity (25ºC) 613.3mPa·s, refractive index (nD20) 1.4852, flash point 193ºC. It is miscible with water, methanol and acetone. At 25ºC, the solubility is: benzene 4.2, ether 1.6, carbon tetrachloride 0.4, n-heptane less than 0.1. Slightly ammoniacal odor, very moisture absorption, can absorb carbon dioxide in the air, exposed to air and turn brown in light. Ethylene oxide and ammonia water are sent into the reactor, and the reaction temperature is 30-40ºC and the reaction pressure is 70.9-304kPa. The mixed liquid of 1, 2 and triethanolamine is formed by condensation reaction. After dehydration and concentration at 90-120ºC, the mixture is sent to three vacuum distillation towers for vacuum distillation, and the fractions are cut off at different boiling points. The finished products of monoethanolamine, diethanolamine and triethanolamine with purity up to 99 can be obtained. In the process of reaction, if the proportion of ethylene oxide is increased, the production proportion of DI and triethanolamine will increase, and the yield of DI and triethanolamine can be improved.
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