Ethanolamines are prepared by the reaction of ammonia and ethylene oxide. They include monoethanolamine (MEA), diethanolamine (DEA) and triethanolamine (TEA). The three are widely used in industry, principally as absorbents for acidic components of natural gas and of petroleum-refinery gas streams. MEA is mainly used as the raw material to produce ethyleneamines. It is also used to make detergents, metalworking fluids, and as gas sweetening. DEA is mainly used as gas sweetening and in agrochemicals. TEA is used in detergents and cosmetics applications and as a cement additive.