Tetrapropylammonium chloride is a quaternary ammonium compound. As a cationic salt, it serves various industrial and biomedical purposes. Commonly utilized as a phase-transfer catalyst, it facilitates the movement of reactants between immiscible phases in organic synthesis reactions. Additionally, Tetrapropylammonium chloride acts as a surfactant in formulations of personal care products, detergents, textiles, and pharmaceuticals. It is also used in producing certain types of polymers and resins.