Diethanolamine is also called dihydroxyethylamine and 2,2′-iminodiethanol. It is a white crystal or colorless liquid with strong hygroscopicity. It is easily soluble in water, methanol, ethanol, acetone and benzene. Its solubility in benzene (g/100g) is 4.2 at 25°C and in ether is 0.8. Its uses are: gas purifier, which can absorb acidic gases in the gas, such as carbon dioxide, hydrogen sulfide, sulfur dioxide, etc. The “Benfil” solution used in the synthetic ammonia industry is mainly composed of this product; it is also used as an emulsifier, lubricant, shampoo, thickener, etc.; an organic synthesis intermediate, used in the production of detergent raw materials, preservatives and daily chemical products (such as surfactants); and synthesized morpholine.