Aniline hydrochloride is widely used in the dye industry as a precursor for the synthesis of various dyes and pigments. It plays a key role in the production of methylene blue, a vital dye in biological staining and textile coloring. Additionally, it serves as an intermediate in the manufacture of pharmaceuticals, particularly in the synthesis of antipyretics and analgesics. In the rubber industry, it is utilized as a vulcanization accelerator to enhance the properties of rubber products. It also finds application in organic synthesis for producing complex chemical compounds.