1-Methyl-1-ethylpyrrolidine bromide is a quaternary ammonium salt. As an important chemical raw material, quaternary ammonium salts are widely used in various fields such as chemical industry and show a growing trend. In particular, Chemicalbook is used as an electrolyte and quaternary ammonium reagent, and its dosage and quality requirements are also increasing. The production of quaternary ammonium salts is generally obtained by alkylation, and can also be obtained by replacing the anions of existing quaternary ammonium salts.