Triethylamine hydrochloride is widely used in organic synthesis as a catalyst or neutralizing agent, particularly in the production of pharmaceuticals and agrochemicals. It is also employed in the preparation of quaternary ammonium compounds, which are essential in various industrial applications, including surfactants and disinfectants. Additionally, it serves as a reagent in the synthesis of dyes, rubber chemicals, and resins. In biochemical research, it is utilized for protein sequencing and peptide synthesis due to its ability to facilitate specific reactions. Its role in pH adjustment and buffering further extends its use in laboratory and industrial processes.