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Eco-friendly production process of iodate

A green production and iodate technology, which is applied in the field of green iodate production technology, can solve problems such as increased energy consumption, safety accidents, and impact on product quality

Active Publication Date: 2020-12-04
TAIAN HAVAY CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] A main disadvantage of direct electrolytic synthesis of potassium iodate is: due to the low solubility of potassium iodate in water, the electrolysis process will increase with the concentration of iodate generated, and the iodate will precipitate and crystallize with potassium ions, and adhere to the plate or membrane, resulting in Increased energy consumption, damage to equipment, and short-circuit of plate crystallization can also cause safety accidents. Therefore, it is difficult to achieve industrial production by direct electrolytic synthesis of potassium iodate
[0012] Potassium iodate is produced by direct oxidation of potassium chlorate, which produces chlorine gas during the reaction, pollutes the environment, and contains a large number of side reaction products in the product, which is difficult to separate and high in cost
[0013] Similarly, if chemical synthesis is used to produce other iodates, the synthesis process will also produce chlorine gas like the synthesis of potassium iodate. Once leaked, it will cause environmental pollution and safety accidents, and the reaction process of dangerous chlorate and nitric acid will produce carbon dioxide. The possibility of chlorine, chlorine dioxide is extremely unstable, and it is easy to cause explosion accidents, so it is difficult to achieve large-scale and continuous production by chemical synthesis
Simultaneous oxidation synthesis of iodate will produce a large amount of by-product chloride, which not only affects product quality, but also pollutes the environment

Method used

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  • Eco-friendly production process of iodate
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Preparation of Potassium Iodate:

[0043]Add 3600mL of deionized water to the 5000mL reaction kettle, put in 632g of lithium hydroxide (≥56.5%), 1910g of iodine, and 12.08g of potassium dichromate, take samples to detect the concentration and pH of lithium ions and potassium dichromate, and add an appropriate amount according to the test results Water, lithium hydroxide, iodine, potassium dichromate, adjust the final lithium ion mass concentration to 1.7%, add potassium dichromate to adjust the potassium dichromate mass concentration to 0.2%, adjust the pH to 10.1, configure 3 batches of electrolysis according to this ratio The solution is transferred to the electrolyte storage tank for later use.

[0044] Part of the configured electrolyte is put into the electrolysis device, the temperature is raised to 80°C, the cycle is started, the voltage is set to 3.8V, the electrolysis is carried out until the mass concentration of iodate is 18%, and the electrolyte is continuou...

Embodiment 2

[0050] The preparation of potassium iodate (mother solution applies mechanically):

[0051] Get the metathesis mother liquor 4000mL that obtains in embodiment 1, detect lithium ion, potassium ion, potassium dichromate concentration, pH value, add appropriate amount of water, lithium hydroxide and iodine fine-tuning according to detection result, make the lithium ion mass concentration in the solution be 0.8 %, potassium ion mass concentration ≤ 1.3%, potassium dichromate mass concentration 0.2%, adjust pH to 9.6, configure 3 batches and transfer to electrolyte storage tank for standby.

[0052] In embodiment 1, add above electrolytic solution continuously in the electrolytic circulation system containing 18% of iodate root that has been stabilized, control electrolytic anode and cathode voltage 3.8V, and extract electrolysis completion liquid continuously from discharge opening, by electrolytic solution feeding valve, Adjust the flow rate, control the mass concentration of iod...

Embodiment 3

[0058] Preparation of sodium iodate:

[0059] Add 3600mL of deionized water to the 5000mL reactor, add lithium hydroxide and iodine, adjust the mass concentration of lithium ions to 1.7%, add sodium dichromate to adjust the mass concentration of sodium dichromate to 0.15%, and adjust the pH to 10.6, according to this ratio Configure 4 batches of electrolyte and transfer it to the electrolyte storage tank for standby.

[0060] Part of the configured electrolyte is put into the electrolysis device, the temperature is raised to 80°C, the cycle is started, the voltage is set to 3.7V, the electrolysis is carried out until the mass concentration of iodate is 16%, and the electrolyte is continuously added to the electrolysis device, and continuously collected from the outlet. The finished electrolysis solution is discharged, the flow rate is adjusted through the electrolyte feeding valve, and the mass concentration of iodate in the finished electrolysis solution is controlled to be 1...

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Abstract

The invention belongs to the field of electrochemical synthesis, and particularly relates to an eco-friendly production process of iodate, which comprises the following steps: preparing lithium iodateby an electrolytic method, and reacting the prepared lithium iodate with iodide to prepare iodate, thereby recycling the mother solution, avoiding the generation of discharged wastes, having high product yield, avoiding the generation of abundant waste salts, and being green and environment-friendly.In the synthesis process of preparing the lithium iodate by the electrolytic method, a clean electrolytic process is used, an oxidizing agent and other additional raw and auxiliary materials do not need to be added like a chemical method, the raw and auxiliary materials are simple, and the produced iodate product is high in quality.

Description

technical field [0001] The invention belongs to the technical field of electrochemical synthesis, and in particular relates to a green production process of iodate. [0002] technical background [0003] Iodine salts are widely used in chemical synthesis, chemical analysis, pesticides, medicine, and material industries; some iodate salts can be used as additives in the food and feed industries. [0004] Taking potassium iodate as an example, it can be used as precipitant and standard reagent in chemical analysis; it can be used as feed additive in agriculture; it can be used as iodine addition agent or medicament for preventing and treating endemic goiter in medicine, and it can also be used in organic synthesis; it can be used in food industry as Additive of the trace element iodine. Existing potassium iodate synthesis methods mainly include direct electrolysis of potassium iodide to synthesize potassium iodate and potassium chlorate oxidation. [0005] The method of direc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/14C01B11/22
CPCC25B1/14C01B11/22C25B1/24C25B15/081
Inventor 孙桂彬王加旺李贺存任淑振
Owner TAIAN HAVAY CHEM
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