In medicine, acetonitrile is used to synthesize a series of important drug intermediates such as vitamin B1, metronidazole, ethambutol, triamterene, adenine and dichlorvos; in pesticides, it is used to synthesize pesticide intermediates such as pyrethroid insecticides and ethoxicarb. High-purity methanol and high-purity acetonitrile are the most widely used and typical high-purity solvent products. High-purity methanol is widely used in many industrial fields such as electronics, pharmaceuticals, biochemicals, fine chemicals, and food, and is mainly used as a mobile phase for high-performance liquid chromatography of chemical precision instruments and a cleaning agent in the electronics industry. High-purity acetonitrile is an extremely strong organic solvent with good solubility for grease, inorganic salts, and polymer compounds. It can clean grease, wax, fingerprints, inorganic salts, corrosive agents, and flux residues on silicon wafers, and is therefore widely used as a semiconductor cleaning agent.