固定床电化学反应器内电解合成丁二酸的研究

摘要

A packed bed electrochemical reactor was used for succinic acid synthesis, and its performance was evaluated by applying different current densities adjusted by changing diameter and amount of titanium pellets. The results indicate that optimum performance can be achieved when using 133 titanium pellets with diameter of 8 mm, current density ratio of ic:ia=1:4, anodic current density of 1000 A.m-2, initial maleic acid weight of percent 9.8%, initial sulfuric acid weight percent of 5%and electrolysis temperature of 50℃. Average reduction yield of 93.7%, current efficiency of 95.0% and cell voltage range of 2.6~3.0 V can be obtained under such conditions. Compared with traditional tank type electrochemical reactors, the packed bed electrochemical reactor can increase average reduction yield of 4.4%, current efficiency of 3.5% and space-time yield of 1.6 times.%设计并制作了一种固定床电化学反应器用于电解合成丁二酸，通过改变固定床层中钛球的直径和填充个数以调控不同的阴极电流密度，对在该反应器内电解合成丁二酸的性能进行评价。结果表明，当固定床层中填充钛球的直径为8 mm，填充个数为133个，阴、阳极电流密度之比为1：4时，选取阳极电流密度1000 A.m-2，投入原料马来酸酐质量分数9.8%，硫酸质量分数5%，电解温度为50℃，可获得最佳的实验结果：平均还原收率可达93.7%，电流效率95.0%，槽电压范围2.6~3.0 V。与传统的箱式电化学反应器相比，平均还原收率可提高4.4%，电流效率提高3.5%，时空产率约为后者的1.6倍。