1-Ethyl-3-methylpyridinium ethyl sulfate is primarily used as an ionic liquid in various industrial and research applications. It serves as a solvent in chemical reactions, particularly in organic synthesis, where it can enhance reaction rates and selectivity. This compound is also employed in electrochemistry, acting as an electrolyte in batteries and supercapacitors due to its high ionic conductivity and stability. Additionally, it is utilized in separation processes, such as liquid-liquid extraction, where it helps in the efficient separation of specific compounds from mixtures. Its role in catalysis is notable, as it can act as a catalyst or catalyst support in various chemical transformations.