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比较静态交换与动态交换试验结果,发现在动态交换过程中,交换柱内纤维的利用率极低,吸附效率不到30%。通过模拟溶液在交换柱内扩散、吸附过程,得出由于交换柱内的纤维填充不均匀产生空隙,造成氯化钠溶液选择性流过交换柱从而降低了吸附效率。采用去离子水充满交换柱,然后用氯化钠溶液逐渐替换的方法,可以大大提高纤维利用率。
Comparing the results of static exchange and dynamic exchange test, we find that in the dynamic exchange process, the utilization of fiber in the exchange column is very low, and the adsorption efficiency is less than 30%. By simulating the diffusion and adsorption process of the solution in the exchange column, it is concluded that the interspaces are formed due to the uneven packing of fibers in the exchange column, resulting in the selective flow of sodium chloride solution through the exchange column, thereby reducing the adsorption efficiency. Filled with deionized water exchange column, and then gradually replaced with sodium chloride solution, can greatly improve fiber utilization.