α- Methylnaphthalene is α- A isomer of methylnaphthalene, which is mainly used in the manufacture of fluorescent brightener, printing and dyeing carrier vinyl chloride fiber, polyester printing and dyeing carrier surfactant, heat carrier, pharmaceutical intermediate and sulfur extractant. It can be used in the production of plasticizer and fiber dyeing aid. It can also be used as a Diesel Cetane Number measuring agent, a reagent for measuring the theoretical plate number of distillation tower, a solvent for pesticides and pesticides, and a solvent for the production of hydrogen peroxide by anthraquinone method. It can also be used to produce plant growth regulators α- Naphthylacetic acid. essence α- Methylnaphthalene can be used to synthesize 1,4 naphthalene dicarboxylic acid as raw material for the production of fluorescent brightener dyes, as well as resin for engineering plastics. 1-Naphthalene diacid can be synthesized as plant growth hormone, 1-Naphthalene dicarboxylic acid can be synthesized as raw material for color photographic dyes, and can also be used as pharmaceutical intermediates.