Method and device for producing potassium iodate through oxygen cathode non-diaphragm electrolysis

A technology of potassium iodate and cathode, which is applied in the field of electrochemical electrolysis to prepare potassium iodate, can solve the problems of product pollution, reduced current efficiency and high cell voltage, and achieves the effects of reducing production cost, improving production efficiency and avoiding reduction.

Inactive Publication Date: 2011-12-28
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But potassium dichromate itself is a kind of carcinogen, very easily causes product pollution, moreover, the electrolyzer voltage of this method is 2.5~3.5V, and energy consumption is higher
[0004] In summary, the existing electrochemical preparation of potassium iodate technology requires high cell voltage and the use of ionic membranes to inhibit the diffusion of iodate to the cathode region, otherwise the current efficiency will be reduced, and the use of ionic membranes makes the production cost the highest. high

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  • Method and device for producing potassium iodate through oxygen cathode non-diaphragm electrolysis

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Embodiment 1

[0025] A plate and frame electrolytic cell is used, titanium ruthenium is used for the anode, oxygen cathode is used for the cathode, cobalt oxide is used as the cathode catalyst, and the effective area of ​​the electrodes is 20cm. 2 , prepare KI 100g / L, KOH 80g / L electrolyte 100ml, electrolyte temperature 45°C, cathode gas chamber into oxygen, current density 100mA / cm 2 , electrolysis time 5h, the average cell voltage 0.675V.

[0026] After electrolysis, the electrolytic solution is heated and concentrated, then cooled and crystallized, and the solid obtained by filtering is dried, and the obtained KIO 3 The solid crude product is washed with ice water, recrystallized and refined, and the mother liquor of the crude crystal and recrystallization is combined, and the KIO in the mother liquor is obtained by titration analysis. 3 Mass 2.15g, solid KIO 3 The mass is 10.38g, and the analyzed purity is 99.78%. All KIOs 3 Yield 97.2%, solid KIO 3 Yield 80.52%, unit KIO 3 The po...

Embodiment 2

[0028] Use a plate and frame electrolytic cell, titanium ruthenium is used for the anode, oxygen cathode is used for the cathode, and the cathode catalyst is Co 3 o 4 , the electrode effective area is 20cm 2 , prepare KI 180g / L, KOH 100g / L electrolyte 200ml, electrolyte temperature 75°C, cathode gas chamber into oxygen, current density 200mA / cm 2 , electrolysis time 9h, the average cell voltage 0.714V.

[0029] After electrolysis, the electrolytic solution is heated and concentrated, then cooled and crystallized, and the solid obtained by filtering is dried, and the obtained KIO 3The solid crude product is washed with ice water, recrystallized and refined, and the mother liquor of the crude crystal and recrystallization is combined, and the KIO in the mother liquor is obtained by titration analysis. 3 Mass 7.08g, solid KIO 3 The mass is 38.14 g, and the analyzed purity is 99.46%. All KIOs 3 Yield 97.44%, solid KIO 3 Yield 82.18%. UnitKIO 3 The power consumption of ele...

Embodiment 3

[0031] Use a plate and frame electrolytic cell, nickel ruthenium is used for the anode, oxygen cathode is used for the cathode, the cathode catalyst is Ag, and the effective area of ​​the electrodes is 20cm 2 , prepare KI 160g / L, KOH 100g / L electrolyte 200ml, electrolyte temperature 75°C, cathode gas chamber into oxygen, current density 200mA / cm 2 , electrolysis time 8h, the average cell voltage 0.764V.

[0032] After electrolysis, the electrolytic solution is heated and concentrated, then cooled and crystallized, and the solid obtained by filtering is dried, and the obtained KIO 3 The solid crude product is washed with ice water, recrystallized and refined, and the mother liquor of the crude crystal and recrystallization is combined, and the KIO in the mother liquor is obtained by titration analysis. 3 Mass 6.71g, solid KIO 3 The mass is 33.62 g, and the analyzed purity is 99.92%. All KIOs 3 Yield 97.76%, solid KIO 3 Yield 81.5%, unit KIO 3 The power consumption of elec...

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Abstract

The invention relates to a method and device for producing potassium iodate through oxygen cathode non-diaphragm electrolysis. In the device in the invention, the mixed solution of potassium iodide and potassium hydroxide is used as electrolyte, wherein iodine ions are oxidized at the anode to generate iodate ions, oxygen is reduced at the cathode to generate hydroxyl ions; the liquid generated by electrolysis is cooled to precipitate potassium iodate crystals; and after potassium iodide and water are added in mother liquor, the mixture is send back to the electrolytic cell for electrolysis. The cathode of the electrolytic cell is an oxygen-consuming cathode and the anode is a corrosion resistant non-sacrificial anode, thus the cationic film or diaphragm is not required and the reduction of iodate ions at the cathode can be avoided. The method is obviously characterized in that the cell voltage is only about 0.6-1.0V, thus the energy consumption can be greatly reduced; the whole flow is performed circularly; and the electrolytic cell has simple structure, no ion film and low operating cost.

Description

technical field [0001] The invention provides a method and a device for preparing potassium iodate by electrochemical electrolysis, in particular a method and a device for preparing potassium iodate through electrochemical oxidation of an anode without a diaphragm by replacing the existing hydrogen evolution cathode with an oxygen reduction cathode. technical background [0002] At present, the industrial preparation methods of potassium iodate mainly include potassium chlorate oxidation method, concentrated nitric acid oxidation method, hydrogen peroxide oxidation method and electrochemical oxidation method. Utilizing potassium chlorate to oxidize elemental iodine is the mainstream process for the production of potassium iodate in my country, but because the oxidation of potassium chlorate needs to be carried out under acidic conditions, the requirements for equipment materials are high; in addition, iodate is easy to react with iodide ions to form iodine under acidic condit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/24
Inventor 唐阳万平玉陈咏梅余章龙孙艳芝李云锦白雅娴莫恒亮苗杰朱海彬
Owner BEIJING UNIV OF CHEM TECH
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