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Organic electrolyte for producing hydrogen by electrolyzing hydrogen sulfide at low temperature, and cyclic reaction device and process

An organic electrolyte and electrolysis reactor technology, which is applied in the electrolysis process, electrolysis components, and bulk chemical production, etc., and can solve the problem of difficult separation of sulfur.

Inactive Publication Date: 2020-08-07
马艺嘉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] One of the objects of the present invention is to provide an organic electrolyte system that can efficiently electrolyze hydrogen sulfide, which can dissolve H 2 S can also dissolve part of the elemental sulfur, and the sulfur can be precipitated by cooling down, which can not only solve the anode passivation problem caused by sulfur deposition in the direct electrolysis method to a certain extent, but also solve the problem that sulfur is not easy to separate in the indirect electrolysis method.

Method used

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  • Organic electrolyte for producing hydrogen by electrolyzing hydrogen sulfide at low temperature, and cyclic reaction device and process
  • Organic electrolyte for producing hydrogen by electrolyzing hydrogen sulfide at low temperature, and cyclic reaction device and process
  • Organic electrolyte for producing hydrogen by electrolyzing hydrogen sulfide at low temperature, and cyclic reaction device and process

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Experimental program
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Effect test

Embodiment 1

[0072] (1) Configure 0.5mol / L[C 3 OHmin]BF 4 Tetraethylene glycol dimethyl ether solution is placed in five electrolytic cells, monoethanolamine MEA is added to make its mass fraction reach 1.5%, and the solution is mixed evenly;

[0073] (2) Infuse high-purity argon for 30 minutes to remove possible oxygen in the solution, while heating to 50°C;

[0074] (3) Introduce hydrogen sulfide gas (which can be produced by the reaction of ferrous sulfide and dilute sulfuric acid or dilute phosphoric acid), and use a three-electrode system (working electrode, counter electrode, Ag / Ag + Reference electrode) carries out cyclic voltammetry test to the hydrogen sulfide in the solution, obtains the CV curve of the electrochemical behavior of the hydrogen sulfide in the solution, as figure 2 shown.

[0075] (4) Carry out constant potential electrolysis at 0V with respect to reference electrode, the current density time curve that electrolysis obtains, detect the hydrogen that generates w...

Embodiment 2

[0080] The difference from Example 1 is:

[0081] Configure 0.2mol / L[C 3 OHmin]BF 4 solution of tetraethylene glycol dimethyl ether. The obtained CV curve of the electrochemical behavior of hydrogen sulfide in solution, such as Figure 7 shown. The yellow solid XRD pattern after electrolysis is as follows Figure 8 shown.

Embodiment 3

[0083] The difference from Example 1 is that

[0084] Configuration 0.1mol / L[C 3 OHmin]BF 4 Add monoethanolamine MEA to make the mass fraction reach 1%, pass 30min high-purity Ar into the five-port electrolytic cell, and heat to 80°C, obtain hydrogen sulfide in the According to the CV curve in the system, the electrolysis voltage is determined to be -0.1V. Hydrogen sulfide is introduced into the system for electrolysis and it is found that there are bubbles in the cathode, that is, hydrogen gas is generated. The electrolysis reaction is carried out for 7 hours. After cooling the electrolyte, it is found that yellow solids are precipitated in the system. After centrifugal filtration , the solid and the supernatant were separated, the supernatant was further electrolyzed, the obtained solid was washed and dried, and the obtained solid was detected as elemental sulfur by XRD.

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Abstract

The invention discloses an organic electrolyte for producing hydrogen by electrolyzing hydrogen sulfide at a low temperature, and a cyclic reaction device and process. The invention relates to a novelelectrolyte system for producing hydrogen by electrolyzing hydrogen sulfide at a low temperature. The system can absorb H2S, elemental sulfur has high solubility dependence in the system, sulfur is separated out through slightly high-temperature electrolysis and cooling, the problem of anode passivation caused by sulfur deposition in a direct electrolysis method is solved, and the problem that sulfur is not easy to separate in an indirect electrolysis method is also solved. The invention also relates to the circular reaction device. The device comprises two parallel electrolytic reactor units, a condensation unit, a heating unit, a gas separation unit and pipelines for connecting the units, wherein the pipelines are provided with delivery pumps and valves, so a reaction can be continuously carried out. Through the design of the electrolyte and the circular reaction device, the toxic and harmful gas H2S is decomposed into elemental sulfur and clean energy gas, namely hydrogen at a lowtemperature, and the reaction can be continuously carried out.

Description

technical field [0001] The invention belongs to the technical field of hydrogen sulfide conversion, and specifically refers to an organic electrolyte, a circulation reaction device and a process for low-temperature electrolysis of hydrogen sulfide to produce hydrogen. Background technique [0002] Hydrogen economy is a strategic direction of my country's current development. The development of hydrogen energy economy is inseparable from the preparation of hydrogen, among which the use of renewable clean energy to generate electricity and hydrogen production through electrolysis of water is an important research topic. At present, there are many methods of hydrogen production in industry, such as hydrogen production by electrolysis of water, hydrogen production by coal gasification, etc., but the energy consumed by these methods in the early stage is greater than the energy contained in the hydrogen produced by them. Therefore, finding a simple and cheap method to produce hy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/02C25B1/00C25B15/08C25B15/00
CPCC25B1/00C25B1/02C25B15/00C25B15/08Y02P20/54
Inventor 马艺嘉
Owner 马艺嘉
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