Selective absorption of iodine by resin
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This post was last edited by sunjl1981 on 2013-1-6 at 19:57. Everyone is aware of the impact of iodine on ion exchange membranes; I would like experts to discuss which brand of resin performs better in removing iodine from saline using ion exchange membranes. This post was last edited by gzhd on 2009-3-11 at 07:33.] # ， ， &
No resin is currently available to handle iodide ions.
Many manufacturers face this challenge: within the allowable range of controls, if the iodine level is high, the sulfate content in the saltwater can be increased appropriately, which results in less damage to the ion exchange membrane!
High iodide ions have a significant impact on the current efficiency of ion membranes； It seems there’s no good way to remove it at the moment; the key is to control the quality of the raw salt: P
What kind of salt is being used? We use lake salt from Qinghai; what method do you use to determine iodine content? Analyze what the iodine content is?
A few days ago, I discussed this with resin manufacturers; Xi’an Lanxiao claimed that their resin has good selectivity for iodine. Other manufacturers also provided their own explanations, all of which sounded reasonable, but it’s unclear what the actual situation is. Therefore, I ask all the experts to share their views based on their own analysis data
I haven’t heard of any chelating resin that has a particularly strong adsorption capacity for iodine. Rohm and Haas does have a specialized device for removing iodine, which also uses resin for adsorption. However, it’s necessary to carefully consider whether the iodine content in the saltwater in question is high enough to justify using such a device. Additionally, this process requires adjusting the pH of the saltwater to an acidic level first, before adjusting it to an alkaline level before it enters the ion exchange tower; in any case, this approach carries certain safety risks.
In fact, resins have little effect on iodine; to reduce the iodine content, it is necessary to use raw salt with a low iodine content.
At present, chelating resins are not yet capable of effectively removing iodine from saline water, as these resins are essentially ineffective in alkaline conditions. Our company does possess resins that can adsorb iodine, but it remains necessary to conduct experiments to determine whether they can achieve removal in alkaline conditions and what the extent of that removal will be.
Currently, the ion-exchange membrane process cannot be used to treat iodine; one can only purchase raw salt with low iodine content.
What analysis method to use? Is it using a spectrum?