Method for removing hypervalent iodine in ionic membrane caustic soda light salt brine

By adjusting the pH value of dilute brine with sodium sulfite and hydrogen peroxide and combining it with modified activated carbon adsorbent, the problem of removing high-valent iodine from dilute brine was solved, achieving low-cost and high-efficiency iodine removal and extending the service life of the ion exchange membrane.

CN121248079APending Publication Date: 2026-01-02INNER MONGOLIA ERDOS ELECTRIC POWER & METALLURGY CO LTD
3 Cites 1 Cited by

Patent Information

Application Number
CN202511712929.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-11-20
Publication Date
2026-01-02

AI Technical Summary

Technical Problem

Existing technologies are insufficient to effectively remove high-valent iodine from the brine in the caustic soda production process using ion-exchange membranes, leading to a shortened membrane lifespan. Furthermore, traditional methods pose risks of contamination and incur high costs.

Method used

Sodium sulfite and hydrogen peroxide were used to adjust the pH of the brine, and modified activated carbon was used as a composite adsorbent. Through primary and secondary adsorption processes, high-valence iodine was converted into low-valence iodine and adsorbed as elemental iodine, thus achieving removal.

Benefits of technology

This method achieves efficient and low-cost reduction of iodine content in brine to below 0.1 mg/L, avoiding system contamination and extending the service life of the ion exchange membrane.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The invention belongs to the technical field of iodine removal of light salt brine, and particularly relates to a method for removing high-valence iodine in ionic membrane caustic soda light salt brine. Comprising the following steps: (1) adding a pH regulator and sodium sulfite into light salt brine, regulating the pH to 1-3, stirring until the reaction is completed, and carrying out primary adsorption deiodination by adopting a composite adsorbent to obtain light salt brine 1; and (2) adding a pH regulator and hydrogen peroxide into the light salt brine 1, regulating the pH value to 1-2, stirring until the reaction is completed, and carrying out secondary adsorption by adopting a composite adsorbent to remove iodine, thereby obtaining the deiodinated light salt brine. According to the removal method disclosed by the invention, high-valence iodine such as periodate and iodate in the light salt brine is converted into low-valence iodine such as iodate and iodide ions by utilizing the reducibility of sodium sulfite and the oxidation-reduction property of hydrogen peroxide in the coexistence of iodide ions and iodate, and then is further converted into simple substance iodine, and the simple substance iodine is efficiently removed by utilizing a composite adsorbent; the process is simple, the cost is low, the removal rate is high, and the removal effect is good.
Need to check novelty before this filing date? Find Prior Art