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Process method of electrochemically preparing Fe3+ and H2 in pair

A process method and electrochemical technology, applied in the electrolysis process, electrolysis components, cells, etc., can solve the problems of difficult regeneration, large energy consumption, system pollution, etc., and achieve high efficiency and energy utilization rate, high energy utilization rate, and current high efficiency effect

Inactive Publication Date: 2016-10-26
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to improve I 2 Solubility, organic solvents such as benzene and toluene can also be used, but it will cause SO 2 The absorption conversion process becomes a liquid-liquid heterogeneous reaction process, which brings about liquid-liquid dispersion mixing and separation of the liquid-liquid dispersion system after the reaction, and the introduction of organic solvents will also bring problems such as solvent recovery and system pollution.
[0020] (3) Fe 3+ easily regenerated, while I 2 Difficulty regenerating
[0037] (1) High production cost: Because in the process of hydrogen production by electrolysis of water, only the target product hydrogen is generated by the cathode reaction, and the oxygen generated by the anode is of little use, so the production cost is relatively high
[0038] (2) The cell voltage is high and the energy consumption is large: due to the relatively high potential of the oxygen evolution at the anode, the operating cell voltage during the electrolysis process is relatively high and the energy consumption is large
[0039] (3) There are potential safety hazards: In the isolation membrane electrochemical reactor, the anode generates oxygen and the cathode generates hydrogen. If the operation is not done properly, the mixture of oxygen and hydrogen will occur and there is a risk of explosion.

Method used

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  • Process method of electrochemically preparing Fe3+ and H2 in pair
  • Process method of electrochemically preparing Fe3+ and H2 in pair

Examples

Experimental program
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Effect test

Embodiment 1

[0092] Such as figure 1 and figure 2 As shown, a paired electrochemical preparation of Fe 3+ and H 2 The process method, the concrete steps are as follows:

[0093] (1) Preparation of anolyte: mix sulfuric acid with water to obtain an aqueous solution of sulfuric acid, then dissolve ferrous sulfate in the aqueous solution of sulfuric acid to obtain a solution containing 0.2mol / L H 2 SO 4 and 0.2mol / L Fe 2+ The anolyte, the operating temperature is 20 ℃.

[0094] (2) Preparation of catholyte: mix sulfuric acid with water to obtain 0.2mol / L H 2 SO 4 The aqueous solution is used as catholyte, and the operating temperature is 20°C.

[0095] (3) Fe 2+ Oxidation to produce Fe 3+ and H + Reduction to prepare H 2 : In an electrochemical reactor with a sulfonic acid type cation exchange membrane as a separator, sulfuric acid as a supporting electrolyte, and flat PbO 2 The electrode is an anode, and the operating current density is 10mA / cm 2 , the operating temperature is...

Embodiment 2

[0097] Such as figure 1 and figure 2 As shown, a paired electrochemical preparation of Fe 3+ and H 2 The process method, the concrete steps are as follows:

[0098] (1) Anolyte preparation: will contain Fe 3+ The sulfuric acid aqueous solution is mixed with sulfuric acid and water, and then ferrous sulfate is dissolved in the solution to obtain a solution containing 8.0mol / L H 2 SO 4 , 2.0mol / L Fe 2+ and Fe 3+ For the anolyte with concentration ≤0.2mol / L, the operating temperature is 60°C.

[0099] (2) catholyte preparation: will contain Fe 3+ and Fe 2+ Sulfuric acid aqueous solution is mixed with sulfuric acid and water to prepare 6.0mol / LH 2 SO 4 , 0.02mol / L Fe 2+ and 0.02mol / L Fe 3+ Concentration of catholyte, the operating temperature is 60 ℃.

[0100] (3) Fe 2+ Oxidation to produce Fe 3+ and H + Reduction to prepare H 2 : In an electrochemical reactor with a sulfonic acid cation exchange membrane as a separator, sulfuric acid as a supporting electrolyte...

Embodiment 3

[0102] Such as figure 1 and figure 2 As shown, a paired electrochemical preparation of Fe 3+ and H 2 The process method, the concrete steps are as follows:

[0103] (1) Anolyte preparation: will contain Fe 3+ The sulfuric acid aqueous solution is mixed with sulfuric acid and water, and then ferrous sulfate is dissolved in the solution to obtain a solution containing 1.0mol / L H 2 SO 4 , 0.4mol / L Fe 2+ and 0.2mol / L Fe 3+ The anolyte, the operating temperature is 40 ℃.

[0104] (2) catholyte preparation: will contain Fe 3+ and Fe 2+ Sulfuric acid aqueous solution is mixed with sulfuric acid and water to prepare 4.0mol / LH 2 SO 4 , 0.01mol / L Fe 2+ and 0.02mol / L Fe 3+ The catholyte, the operating temperature is 40 ℃.

[0105] (3) Fe 2+ Oxidation to produce Fe 3+ and H + Reduction to prepare H 2 : In an electrochemical reactor with a sulfonic acid type cation exchange membrane as a separator, sulfuric acid as a supporting electrolyte, and a graphite three-dimension...

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Abstract

The invention provides a process method of electrochemically preparing Fe3+ and H2 in pair, particularly electrochemical synthesis in pair, wherein the electrochemical synthesis in pair, realizing preparation of Fe3+ by oxidizing Fe2+ and coproduction of H2, comprises the following steps: in an isolating membrane electrochemical rector, performing an oxidizing reaction on Fe2+ at an anode by taking a sulfuric acid aqueous solution containing Fe2+ as an anode liquid to generate Fe3+; and performing a reducing reaction on H+ at a cathode by taking a sulfuric acid aqueous solution as a cathode liquid to obtain H2. The process method provided by the invention realizes electrochemical synthesis in pair where the target products are obtained at the anode and the cathode at the same time, the technical process is simple and convenient to operate and control, the atom utilization ratio of the process is high, the equipment investment and production cost are low, the process is safe and reliable, and large-scale industrialization is facilitated.

Description

technical field [0001] The present invention relates to a kind of pair electrochemical preparation Fe 3+ and H 2 The technical method of the technical method belongs to the technical field of inorganic compound synthesis, especially the technical field of iron compound synthesis; it also belongs to the technical field of hydrogen preparation, especially the technical field of hydrogen energy preparation; it also belongs to the technical field of electrochemical reaction engineering and chemical separation technology. Background technique [0002] 1. Fe in sulfuric acid medium 3+ Features of use as an oxidizing agent [0003] In acidic medium, Fe 3+ and Fe 2+ can exist stably, Fe 3+ with Fe 2+ The following reactions can occur between: [0004] 2Fe 3+ →2Fe 2+ +2e - [0005] Standard electrode potential for this reaction At 1.0mol / LH 2 SO 4 solution, Therefore, Fe 3+ is an oxidizing agent with moderate oxidation ability, and Fe 2+ It is a reducing agent with...

Claims

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Application Information

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IPC IPC(8): C25B1/02C25B1/00C25B9/08C25B9/19
CPCC25B1/00C25B1/02C25B9/19
Inventor 许文林李宝同王大为王雅琼
Owner YANGZHOU UNIV
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