乙二醛电氧化合成乙醛酸产物的分离  

Separation of system of glyoxylic acid by electrodialysis

作　　者：苏蕊[1] 张新胜[1] 陈驰[1] 

机构地区：[1]华东理工大学化学工程联合国家重点实验室,上海200237

出　　处：《化工学报》2010年第S1期43-50,共8页CIESC Journal

摘　　要：采用电渗析法实现乙二醛电氧化合成乙醛酸体系产品的分离,以淡化室储槽中溶液的组分含量为分析对象,分别考察电流密度、淡化室流速、温度、阴离子交换膜对电渗析作用的影响。实验结果表明,随着电流密度增大,氯离子迁移速率先增大后减小,初期电流密度可为628.7A·m-2;当盐酸通过率为50%,则电流密度应调整为456.6A·m-2,此时乙醛酸的迁移量最少,分离效果最好。当流速为3.37cm·s-1时,各组分迁移速率最大;当流速为4.21cm·s-1时,乙醛酸的迁移量较少,分离效果最好。温度升高,各物质的迁移量增大,选择性下降,操作温度在30℃最适宜;ASV膜的透过性比AHT膜大,AHT膜选择性好。This paper attempted to separate glyoxylic acid from the system of the electro-oxidation of glyoxal by electrodialysis.The influences of current density,flow velocity,temperature and nature of anion membrane on electrodialysis were studied.The results showed that flow rate at 4.21 cm·s-1,temperature at 30℃,AHT as anion membrane and the process with current density 628.7 A·m-2 at early stage and 456.6 A·m-2at later stage benefitted the separation of the system of glyoxylic acid.

关 键 词：乙醛酸 电渗析 膜分离 

分 类 号：TQ225.2[化学工程—有机化工]