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.At room temperature, it is a colorless transparent viscous liquid with a slight ammonia taste. It is hygroscopic and can absorb moisture and carbon dioxide in the air. Can be arbitrarily mixed with water and alcohol, soluble in chloroform, slightly low in benzene and ether. 0. The pH of 1moI/L solution is 10.5. Risk of burning in high heat, open flame or contact with oxidants. Its aqueous solution is corrosive.Triethanolamine is less basic than ammonia (pKa=7.82) and has the properties of tertiary amines and alcohols. React with organic acids to form salts at low temperatures and esters at high temperatures. Chelates that form 2-4 ligands with a variety of metals. Amine oxides are formed when oxidized with hypochlorous acid. It is decomposed by periodate oxidation into ammonia and formaldehyde. It reacts with sulfuric acid to form hydroxyethyl morpholine. Triethanolamine can absorb acidic gas at low temperature and release it at high temperature.
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