Ethanolamine is also called “aminoethanol”. Chemical formula HOCH2CH2NH2. Molecular weight 61.08. Colorless viscous liquid. Hygroscopic, with the smell of ammonia. Specific gravity 1.0117 (25/4℃). Melting point 10.3℃. Boiling point 170.8℃. Refractive index 1.4539. Miscible with water, methanol, acetone, slightly soluble in benzene, ether, slightly soluble in n-pentane. Strong alkalinity, dissociation constant K=3.39×10-Chemicalbook10(25℃); 25% aqueous solution pH is 12.1, can absorb carbon dioxide in the air. Its hydrochloride is hygroscopic crystal, melting point 75～77℃. It is industrially prepared by the reaction of ethylene oxide and ammonia water. Ethanolamine is an important chemical raw material used in the manufacture of medicines, fragrances, surfactants, coatings, emulsifiers, etc. It is also a leather softener and pesticide dispersant. It can also be used for gas purification to remove carbon dioxide and hydrogen sulfide from the gas.