电压对电渗析回收汽油碱渣中NaOH的影响

 采用电渗析方法回收汽油碱渣中的NaOH。以胜华汽油碱渣为原料，考察了不同电压对NaOH回收率的影响；以大港催化裂化汽油碱渣为原料, 探讨了电场存在与否对电渗析回收NaOH的影响。 结果表明, 增加电压有利于提高碱渣NaOH的回收率和缩短回收时间, 但电流过大会缩短离子膜和电极的使用寿命; 当碱渣中NaOH浓度较大时, 在电场存在的条件下进行电渗析回收NaOH, 在较短的时间内就会有较好的效果。综合回收效果及离子膜与电极的承受能力 , 比较适宜的单对膜电压为2~2.5V。

EFFECT OF VOLTAGE ON RECOVERY OF NaOH FROM ALKALINE RESIDUE OF GASOLINE BY ELECTRODIALYSIS

Abstract: In this paper, electrodialysis is used for recycling NaOH from alkaline residue of gasoline. The voltage influence was investigated under five different voltage using alkaline residue from ShengHua atmospheric distillation as basic material. The higher the voltage is, the higher the recovery rate is, and the shorter the time of recovery is. But if the current is too high, it will shorten the working life of the electrode and the ion exchange membrane. The voltage 24V～30V is appropriate by thinking about the effect of reclaiming and the durability of the electrode and the ion exchange membrane. Compared with the effect without electric field, alkaline residue from DaGang FCC gasoline as basic material was used to study the effect of reclaiming NaOH under 24v voltage for further validation. Within a short time, the effect in reclaiming alkaline is much better in the electric field than that without electric field when there is a high concentration difference of NaOH.