固定床电解槽变电流成对电解合成乙醛酸  

Varying Current Electro-synthesis of Glyoxalic Acid in Pairs in the Fixed-bed Electrolytic Cell

作　　者：陈银生[1] 张新胜[1] 戴迎春[1] 袁渭康[1] 

机构地区：[1]华东理工大学联合化学反应工程研究所反应工程国家重点实验室,上海200237

出　　处：《电化学》2002年第1期60-65,共6页Journal of Electrochemistry

摘　　要：对电解氧化乙二醛合成乙醛酸过程 ,固定床电解槽和变电流电解效果明显优于平板型电解槽和恒电流电解效果 .当阳极液中乙二醛和盐酸初始质量分数 (WCHOCHO 和WHCI)分别等于7.0 %和 8.0 %、阴极液为始终饱和的草酸溶液和微量的添加剂时 ,采用平均电流密度 (i)为 15 35A/m2 的变电流方式电解 ,阳极电流效率 (CEa)为 85 .3%、乙醛酸选择性 (RSa)为 93.9% ;阴极电流效率 (CEc)为 86 .7% ,乙醛酸选择性 (RSc)为 94 .0 % .阳极初产品中WCHOCOOH∶WCHOCHO≥ 4 0∶3。As for the process of the electro oxidation of glyoxal to glyoxalic acid, the electrolytic result of either fixed bed electrolytic cell or varying current electrolysis was better than that of either flat plate electrolytic cell or constant current electrolysis. The average current density of varying current electro synthesis of glyoxalic acid in pairs was 1535 A/m 2 and the current efficiency were 85.3% and 86.7% and the selectivity were 93.9% and 94.0% for the anodic oxidation and cathodal reduction respectively. The initial composition of anodic electrolyte was 7% glyoxal and 8% hydrochloric acid (W/W) and the cathodal electrolyte consisted of saturated oxalic acid aqueous solution mixed with trace quantity of additive. The mass ratio of glyoxalic acid to glyoxal of the primary anodic product was over 40∶3, which avoided the separation of glyoxal from glyoxalic acid aqueous solution.

关 键 词：乙醛酸 成对电解 合成 固定床电解槽 交电流电解 乙二醛 草酸 

分 类 号：TQ226[化学工程—有机化工]