Process of producing H2 by way of parallel Fe2+ anodic oxidation and cathodic reduction

A technology of anodic oxidation and process method, which is applied in chemical instruments and methods, photographic process, photographic auxiliary process, etc., and can solve problems such as difficult regeneration, high cell voltage, solvent recovery, etc.

Active Publication Date: 2016-09-07
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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
[0034] (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
[0035] (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
[0036] (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 of producing H2 by way of parallel Fe2+ anodic oxidation and cathodic reduction
  • Process of producing H2 by way of parallel Fe2+ anodic oxidation and cathodic reduction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] Such as figure 1 and figure 2 As shown, a Fe 2+ Anodic oxidation and cathodic reduction co-produce 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) catholyte preparation: will contain Fe 3+ The sulfuric acid aqueous solution is mixed with sulfuric acid and water, and then the ferrous sulfate is dissolved in the sulfuric acid aqueous solution to obtain 8.0mol / L H 2 SO 4 , 2.0mol / L Fe 2+ and 0.02mol / L Fe 3+ The catholyte, the operating temperature is 20 ℃.

[0095] (3) Fe 2+ Anodic oxidation and cathodic reduction co-produce H 2 : In an electrochemical reactor with a sulfonic acid type cation exchange membrane as the isolation membrane, su...

Embodiment 2

[0097] Such as figure 1 and figure 2 As shown, a Fe 2+ Anodic oxidation and cathodic reduction co-produce 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 8.0mol / L H 2 SO 4 , 2.0mol / L Fe 2+ and Fe 3+ For anolyte with concentration ≤0.2mol / L, the operating temperature is 60°C.

[0099] (2) catholyte 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 8.0mol / L H 2 SO 4 , 2.0mol / L Fe 2+ and 0.02mol / L Fe 3+ The catholyte operating temperature is 60°C;

[0100] (3) Fe 2+ Anodic oxidation and cathodic reduction co-produce H 2 : In an electrochemical reactor with a sulfonic acid type cation exchange membrane as a separator, sulfuric acid as a supporting el...

Embodiment 3

[0102] Such as figure 1 and figure 2 As shown, a Fe 2+ Anodic oxidation and cathodic reduction co-produce H 2 The process method, the concrete steps are as follows:

[0103] (1) Anolyte preparation: will contain Fe 2+ and Fe 3+ The sulfuric acid aqueous solution is directly used as the anolyte, and the solution composition is 6.0mol / L H 2 SO 4 , 0.8mol / L Fe 2+ and 0.1mol / L Fe 3+ , operating temperature is 40°C.

[0104] (2) catholyte preparation: will contain Fe 2+ and Fe 3+ The sulfuric acid aqueous solution is directly used as the catholyte, and the solution composition is 8.0mol / L H 2 SO 4 , 1.0mol / L Fe 2+ and 0.02mol / L Fe 3+ , operating temperature is 40°C.

[0105] (3) Fe 2+ Anodic oxidation and cathodic reduction co-produce H 2 : In a three-dimensional fixed-bed electrode electrochemical reactor with a sulfonic acid-type cation-exchange membrane as a separator, sulfuric acid as a supporting electrolyte, and a graphite electrode as an anode, the operatin...

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Abstract

The invention provides a process of producing H2 by way of parallel Fe2+ anodic oxidation and cathodic reduction. The method is carried out in an aqueous solution of sulfuric acid by oxidizing Fe2+ at an anode to obtain Fe3+ and reducing Fe2+ at a cathode to generate Fe, and simultaneously reducing H+ in an catholyte to produce H2. The method provided by the present invention achieves regeneration of Fe3+ at the anode and deprivation of Fe2+ and coproduction of H2 at the cathode; in such a way, paired electrochemical synthesis of obtaining a target product at both the cathode and the anode is realized, allowing effective utilization of double chamber electrodes. The process of producing H2 by way of parallel Fe2+ anodic oxidation and cathodic reduction is simple in procedure, convenient to operate and control, high in efficiency of procedure and energy utilization rate, low in equipment investment and production cost, safe and reliable in procedure, and conducive to large-scale industrialization.

Description

technical field [0001] The present invention relates to a kind of Fe 2+ Anodic oxidation and cathodic reduction co-produce H 2 The process method belongs to the field of inorganic chemical preparation technology, also belongs to the field of hydrogen and sulfuric acid preparation technology, especially the field of hydrogen energy preparation technology; also belongs to the 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 2+ →2Fe 3+ +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 moderate reducing ability. Fe 3+ able to I - 、H 2 Oxidation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/02C25B9/08C25C1/06C01B17/74C25B9/19
CPCC25B1/02C25C1/06C01B17/74C25B9/19Y02P10/20
Inventor 王雅琼李宝同王大为许文林
Owner YANGZHOU UNIV
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