关键词: 苯酚, 对苯醌, 电解氧化, 萃取剂

Abstract: The benzoquinone was prepared from phenol by electrooxidation in an H-type cell with cation exchange membrane, in which lead plates were used both as an anode and a cathode, while H₂SO₄ was used as a supporting electrolyte. The effects of current density, concentration of sulphuric acid, concentrations of benzoquinone in electrolyte and extractant on the yields and efficiencies of electrolysis were investigated. Under the optimized conditions of current density being 4 A·dm^-2, concentration of sulphuric acid 1 mol·L^-1, passed charge 3.2 A·h, the yield and current efficiency of benzoquinone could reach 68% and 24.7%, respectively, without using chloroform as an extractant. However, the yield and current efficiency of benzoquinone could be increased to 73% and 26%, respectively, in the presence of chloroform extractant which could be recycled in the preparation of benzoquinone.

Key words: phenol, beznoquinone, electrochemical oxidation, extractant