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工业上多采用硫酸/铬酐(或重铬酸钠)氧化2-甲基萘合成2-甲萘醌,但此法会产生大量的含铬废水,对环境污染严重。研究了以硝酸钴为催化剂、Oxone为氧化剂催化氧化2-甲基萘合成2-甲萘醌的新方法。研究表明,当以5 mol%硝酸钴为催化剂、Oxone为氧化剂、乙腈/水为溶剂,在反应温度为25℃、反应时间为16 h时,2-甲基萘的转化率和2-甲萘醌的产率分别为82.6%和51.2%。该反应可在室温下进行,反应平稳、绿色、环保、节能、高效。
Industrial use of sulfuric acid / chromic anhydride (or sodium dichromate) oxidation of 2-methylnaphthalene synthesis of 2-menadione, but this method will produce a lot of chromium-containing wastewater, serious environmental pollution. A new method for synthesizing 2-methylnaphthalene from 2-methylnaphthalene by using cobalt nitrate as catalyst and Oxone as oxidant was studied. The results showed that when the conversion of 2-methylnaphthalene and 2-methylnaphthalene were 5 mol% cobalt nitrate as catalyst, Oxone as oxidant and acetonitrile / water as solvent, the reaction temperature was 25 ℃ and the reaction time was 16 h, The quinone yields were 82.6% and 51.2%, respectively. The reaction can be carried out at room temperature, the reaction smooth, green, environmentally friendly, energy saving and efficient.