邻甲基苯甲醛的“槽内式”间接电合成  

"In-Cell" Indirect Electrosynthesis of o-Tolualdehyde from o-Xylene

作　　者：易清风[1] 于站良[2] 范敏[3] 周秀林[1] 刘小平[1] 

机构地区：[1]湖南科技大学化学化工学院,湘潭411201 [2]昆明理工大学材料与冶金工程学院 [3]中国船舶重工集团公司第七一八所净化设备工程部

出　　处：《应用化学》2005年第10期1127-1131,共5页Chinese Journal of Applied Chemistry

基　　金：湖南省自然科学基金(03JJY6004);湖南省教育厅青年基金(03B043)资助项目

摘　　要：在V5+离子存在的硫酸溶液中,通过往阴极表面不断通入氧气,一步直接将邻二甲苯氧化为邻甲基苯甲醛。研究了硫酸浓度、电流密度、反应温度、反应时间、V5+浓度以及表面活性剂CTAB等因素对电流效率影响。结果表明,在硫酸浓度为10 mol/L,CTAB浓度为0.001 mol/L,反应温度60℃,电流密度为1.5×10-3A/cm2及反应时间为3 h的条件下,产生邻甲基苯甲醛的电流效率达155.2%。电解后的水溶液相循环使用4次的电流效率分别为151.0%、147.1%、150.0%和148.6%,保证了整个过程无废液排放,符合绿色化学要求。A new approach to the “in-ceil” indirect electrosynthesis of o-tolualdehyde from o-xylene is reported in this paper. In an aqueous sulfuric acid solution containing V^5＋ ions, o-xylene was directly eletrooxidized to o-tolualdehyde in an undivided cell where oxygen was continuously bubbled over the cathodic surface. The experimental conditions affecting the current efficiency for the o-tolualdehyde production, such as H2SO4 concentration, current density, electrolytic temperature, reaction time, V^5＋ concentration, and surfactant CTAB, were determined. The results show that the maximum current efficiency for o-tolualdehyde production was 155.20%. The current efficiency remained - 150% even when the aqueous solution separated from the electrolysis mixture was recycled for four times.

关 键 词：邻甲基苯甲醛 氧电还原 氧还电对V^5+/V^4+ 邻二甲苯 电解 

分 类 号：O621.3[理学—有机化学] TQ612.2[理学—化学]