离子交换膜更换前后的效果对比

Effect comparison before and after replacement of ion-exchange membrane

膜极距离子膜法制碱装置中,膜的破损直接影响产品产量。通过观察pH值变化、阳极岀口溢流时间、阳极出口溢流情况,可以检测膜是否破损。根据天伟化工有限公司的生产数据,看出:膜运行2年后,32%片碱中氯酸盐含量达到0.001%;运行3年将达到0.003%以上。换膜后,碱中含盐质量分数降至0.00043%以下,电流效率明显提高,吨碱耗降低,气体纯度明显升高,各种辅料消耗量减少,对企业节能降耗起到了良好的促进作用。

In production of caustic soda by zero-gap ion-exchange membrane electrolyzers, the breakage of the membrane directly affects the output of the product. By observing the change in pH value, the overflow time and overflow situation at the anode outlet, the membrane can be detected whether it is damaged or not. According to the production data of Tianwei Chemical Co., Ltd., it can be seen that the chlorate content in 32% flake alkali reaches 0. 001% after 2-year operation and 0. 003% after 3-year operation. After membrane replacement, the salt content in alkali decreased to less than 0. 000 43%. Moreover, the current efficiency is obviously increased, the material consumption per ton of alkali is reduced, the gas purity is obviously increased, and the consumption of various auxiliary materials is reduced. Thus, energy saving and consumption reduction are promoted.