Resin column regeneration
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Does waiting for over ten hours after acid washing during the resin column regeneration process before performing water washing have any adverse effects on the resin?
Since the acid contains a certain amount of free chlorine, and saltwater contains chlorates, it is necessary to carry out a water wash after acid cleaning under normal circumstances; otherwise, the resin can easily be poisoned
It’s likely that the process was halted due to valve damage during regeneration or because there wasn’t enough space to store the wastewater. Try not to wait while carrying out the acid cleaning process; as the moderator above mentioned, the chlorates in acid and saltwater can react to produce free chlorine, which can poison the resin. Of course, I think the possibility of a reaction caused by temperature is low, but the free chlorine present in hydrochloric acid is indeed a problem
Thank you! You’re absolutely right; the acid we use for pickling is ensured to have zero free chlorine content through chemical analysis.
Nanofiltration machines can be considered to separately purify and recover acids and bases. It can generate significant economic value and environmental benefits. Generally, recycled hydrochloric acid with a high concentration (greater than 1%) is collected and purified using nanofiltration to remove more than 95% of calcium, magnesium ions, pigments, and other macromolecular impurities, with a recovery rate of over 80%. It is also possible to collect regenerated waste alkali solutions with a high concentration (greater than 1%), purify them using nanofiltration to remove more than 93% of macromolecular impurities such as pigments, with a recovery rate of over 80% as well. The purified dilute hydrochloric acid can be supplemented with some concentrated hydrochloric acid for use in the next regeneration process. The purified weak alkaline solution can also be reused for the next regeneration by simply adding some liquid alkali to it. I saw on Baidu Wenku, at https://wenku.baidu.com/view/83a9ef9a81eb6294dd88d0d233d4b14e84243e54.html, that they offer equipment rental services. It can be used without any investment. But it seems there are requirements regarding the processing volume. It’s not very cost-effective when the quantity is too small.