N,N,N',N'-Tetraethylmalonamide is a specialty chemical primarily employed as a solvent extractant in liquid-liquid extraction processes. It is widely used for the separation and recovery of rare earth elements (REEs), lanthanides, actinides, and other metal ions from aqueous solutions, with key applications in hydrometallurgy, nuclear fuel reprocessing, and rare earth processing industries. Its chelating properties enable selective coordination and extraction, making it valuable for purifying strategic metals. Additionally, it serves as an auxiliary reagent in organic synthesis for specialty chemicals and may find use in heat transfer systems in specialized industrial settings.