Hebei Tianao Technology Co.,Ltd

overview
Triethanolamine is also known as trihydroxyethylamine and aminotriethanol. Colorless oily liquid, ammonia odor, easily absorbs water, turns brown in the air and in light. At low temperatures, it becomes a colorless or light yellow cubic crystal. The melting point is 21.2 °C, the boiling point is 335.4 °C, 277 °C (19.950kPa), 206~207 °C (1.995kPa), the relative density is 1.1242, and the refractive index is 1.4852. Kb＝2.5×10-10。 The pH of 0.1mol/L aqueous solution is 10.5. It is miscible with water, methanol and acetone. Soluble in benzene and ether, slightly soluble in carbon tetrachloride and n-heptane. A strong base, which binds to protons and can be used in condensation reactions. In analytical chemistry, triethanolamine can be used as a stationary liquid for gas-liquid chromatography (maximum use temperature 75 °C, solvent is methanol and ethanol) for the separation of pyridine and methyl substituents. In the analysis of complexation titration, it can be used as a masking agent for interfering ions, such as in a solution with pH = 10, when using EDTA to titrate magnesium, zinc, cadmium, calcium, nickel and other ions, this reagent can be used to mask titanium, aluminum, iron, tin and other ions. In addition, it can also be used with hydrochloric acid to form a buffer solution with a certain pH value. Triethanolamine is mainly used in the manufacture of surfactants, liquid detergents, cosmetics, etc. It is one of the components of cutting fluid and antifreeze. In the polymerization of nitrile rubber, it is used as an activator, vulcanization activator for natural rubber and synthetic rubber. It can also be used as an emulsifier for oils, waxes, pesticides, etc., a humidifier and stabilizer for cosmetics, a softener for textiles, and an anti-corrosion additive for lubricating oils. Triethanolamine can absorb gases such as carbon dioxide and hydrogen sulfide, and can remove acid gases in the purification of industrial gases such as coke oven gas. It is a masking agent commonly used in EDTA titration. China stipulates that the allowable concentration in the air is 3μg/g.