Triethanolamine is used as an emulsifier and pH adjuster in cosmetics and personal care products, such as creams, lotions, cleansers, and soaps, to mix water and oil-based ingredients, stabilize formulations, improve texture, maintain pH stability, and reduce skin irritation.

In industrial cleaners and detergents, it enhances cleaning efficiency by softening water and improving ingredient solubility. In the paint and coatings industry, it adjusts pH, increases formulation stability, and promotes faster drying. In textiles, it aids dyeing processes for better color adhesion.

It is used in gas treatment processes to remove acidic gases like hydrogen sulfide and carbon dioxide from natural gas streams. Serves as a corrosion inhibitor in metalworking fluids, cooling systems, and lubricant formulations. Also utilized in the production of surfactants and as a buffering agent in pharmaceuticals.