Span 60对3-甲基吡啶电氧化的影响

通过循环伏安曲线测定,考察了Span 60(山梨糖醇酐单硬脂酸酯)对3-甲基吡啶电氧化的影响。正交实验确定的最佳反应条件是:n(3-甲基吡啶)/n(硫酸)=0.4,添加高于或接近临界胶束浓度的Span 60,反应温度15℃,阳极电位1.9~2.0 V,电解电量为理论电量的10%;其选择性可达85.46%,电流效率为48.69%,电流密度提高300 mA/cm2,并根据最佳反应条件进行外循环放大实验,其结果与小试基本相同。在选定的实验范围内,Span 60对3-甲基吡啶电氧化有明显的促进作用,有应用前景。

Effect of Sorbitan Monostearate(Span 60) on the Electrooxidation of 3-Picoline

Electrooxidation of 3-picoline was studied by cyclic voltammetry in sulfuric acid solution with surfactant sorbitan monostearate(Span 60).The optimum conditions of electrooxidation of 3-picoline were determined in the electrolytic system by orthogonal experiments to be:n(3-picoline)/n(H2SO4)=0.4,temperature 15 ℃,anode potential 1.9～2.0 V,electric quantity 10% of the theoretical,and Span 60 concentration close to or exceeding the critical micellar concentration.The selectivity and current efficiency were 85.46%and 48.69%,respectively,and the current density was enhanced by 300 mA/cm2 in electrooxidation of 3-picoline by addition of Span 60.The scale-up tests were performed,and the results were almost uniform with the orthogonal experiments.This mothod possesses application prospect.