A kind of Fe2+ anodic oxidation and cathodic reduction parallel production method of H2

Abstract

The present invention provides a kind of Fe2+ anodic oxidation and cathodic reduction and co-produced H2 process method, this method is in sulfuric acid aqueous solution, Fe2+ is oxidized at anodic to obtain Fe3+, Fe2+ is reduced at cathode to generate Fe, at the same time H+ in catholyte is reduced to generate H2 . The process method of the present invention realizes the regeneration of Fe3+ at the anode, the removal of Fe2+ and the co-production of H2 at the cathode, and realizes the paired electrochemical synthesis of the target product at the cathode and the anode at the same time, so that the double-chamber electrodes are effectively obtained. use. The technological process of the present invention is simple, easy to operate and control, high in process efficiency and energy utilization rate, low in equipment investment and production cost, safe and reliable in process, 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...

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 problems of 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.

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