Quinoline is used in the preparation of nicotinic acid drugs, hydroxyquinoline drugs, cyanine blue pigments, photosensitive pigments, rubber accelerators, and the pesticide 8-hydroxyquinolinone.It serves as an organic synthesis reagent, basic condensing agent, and solvent.It is used as an analytical reagent and solvent, and also for the separation of vanadates and arsenates.It is used in the manufacture of cardiotonics, and can also be used as an acid, solvent, preservative, etc.In the pharmaceutical industry, it is used to produce nicotinic acid drugs and 8-hydroxyquinoline drugs;in the printing and dyeing industry, it is used to prepare cyanine blue pigments and photosensitive pigments;in the rubber industry, it is used to produce accelerators.