The synthesis of 2-menadione faces challenges such as high cost,a large wastewater treatment capacity,low selectivity,and difficulty in product separation.Considering the properties of 2-menadione,concentrated sulfuric acid(98％)was chosen as the catalyst,2-methylnaphthalene as the reaction raw material,and hydrogen peroxide as the oxidizer,with acetic acid as the solvent.The optimal conditions for synthesizing 2-menadione were determined as follows:concentrated sulfuric acid was used as the catalyst with a dosage of 1.5％,hydrogen peroxide was used as the oxidizer at a molar ratio of hydrogen peroxide to 2-methylnaphthalene of 1.8,the reaction time was set at 5 hours,and the reaction temperature was maintained at 60 ℃.Concentrated sulfuric acid functioned as the catalyst to facilitate the conversion of acetic acid into peracetic acid.This intermediate compound initially oxidized methyl naphthalene,subsequently transforming into 2-menadione through a gradual oxidation process using hydrogen peroxide.The conversion rate of 2-methylnaphthalene reached 46.37％,yielding a 39.45％output of 2-menadione with a selectivity of 90.34％.
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维普
