阴极冷却固定床反应器电合成乙醛酸  

Electrosynthesis of glyoxylic acid in a static bed reactor with cooled cathode

作　　者：樊金红[1] 李军[2] 苏玉忠[2] 胡晓慧[2] 高廷耀[1] 

机构地区：[1]同济大学环境学院,上海200092 [2]厦门大学化工系,福建厦门361005

出　　处：《应用化工》2004年第3期24-25,27,共3页Applied Chemical Industry

基　　金：福建省自然科学基金资助项目(F99029)

摘　　要：以过饱和草酸水溶液为阴极液,盐酸溶液为阳极液,在阴极冷却固定床电化学反应器内草酸电解合成乙醛酸。考察了电流密度、电极和电解液温度、阴极材料对合成乙醛酸时空产率和电流效率的影响。结果表明,阴极冷却固定床反应器是一种较理想的反应器,用石墨板作阳极,铅作阴极,电流密度为400.5A/m2,阴极空速u0=0.505m/s,电解温度为20℃左右时,电解1.5h,在阴极可得到质量分数为5.45%的乙醛酸溶液,平均时空产率可达0.12kg/dm3·h以上。Glyoxylic acid was produced by electroreduction of oxalic acid in the static bed reactor with cooled cathode. The cathodic and anodic electrolytes were super-saturated oxalic acid and hydrochloric acid aqueous solutions. The current efficiency and time-space yield of glyoxylic acid were studied under different current densities, temperatures of cathode and electrolyte,materials of cathode. The results indicated that the cooled cathode static bed reactor is an excellent reactor. The average space-time yield of glyoxylic acid is over 0.12 kg/dm^3·h and the concentration of glyoxylic acid can reach 5.45% after 1.5 h electrolysis with cathode of lead and anode of graphite board under conditions of temperature 20℃,superficial flow rate of 0.505 m/s and current density of 400.5 A/m^2 in the cooled cathode static bed reactor.

关 键 词：草酸 乙醛酸 阴极冷却 固定床反应器 

分 类 号：TQ151.5[化学工程—电化学工业]