A full-process process for producing hydrogen and sulfur by electrochemically decomposing hydrogen sulfide assisted by a mediator

Abstract

The present application discloses a full-process process method for producing hydrogen and sulfur by electrochemically decomposing hydrogen sulfide assisted by a mediator. The process method includes using hydrogen sulfide as a raw material, including three units: media absorbing hydrogen sulfide to produce sulfur, media catalytic hydrogen evolution, and media electrochemical conversion. The process and method provided by the present invention can accurately control the reaction progress of each unit, balance the reaction rate of each unit, and effectively improve the raw material processing efficiency and reduce the operating energy consumption through media circulation. Under media-assisted conditions, 100% absorption and conversion of hydrogen sulfide and production of high-purity hydrogen and sulfur are achieved, providing a practical electrochemical path and method for the resource conversion and utilization of hydrogen sulfide.

Description

Technical Field

[0001] The present application relates to a full-process process for producing hydrogen and sulfur by electrochemically decomposing hydrogen sulfide assisted by a medium, which belongs to the field of resource conversion and utilization of harmful gases, and also belongs to the field of large-scale hydrogen production from new energy sources. Background Art

[0002] Hydrogen sulfide is a highly toxic and harmful gas that mainly comes from natural gas chemical industry, petrochemical industry and coal chemical industry.

[0003] The most commonly used hydrogen sulfide treatment process in industry at present is the traditional Claus process, which first uses alcohol amine solvents to separate hydrogen sulfide gas, purifies and concentrates it, and then burns it into water and sulfur through chemical oxidation. Sulfur is also recovered during the desulfurization process. In addition, wet desulfurization technology represented by the LO-CAT complex iron process is more suitable for treating tail gas with lower hydrogen sulfide content. Specifically, it uses Fe-containing 3+ The absorption liquid is used to oxidize hydrogen sulfide to generate sulfur, and then the absorption liquid is oxidized with air to regenerate it, and the absorption liquid is recycled and reused. The biggest disadvantage of the current conventional hydrogen sulfide treatment method is that the hydrogen element in the hydrogen sulfide is oxidized to water and cannot be effectively utilized. In order to achieve efficient utilization of resources, energy conservation and emission reduction, and turn waste into treasure, the new technology of treating hydrogen sulfide using electrochemical methods has gradually attracted people's attention. In previous work, we disclosed a method for electrochemical decomposition of hydrogen sulfide assisted by a mediator (CN107815698A, CN111232921A), the reaction conditions are mild, and hydrogen can be generated while generating sulfur. It is an effective and green hydrogen sulfide treatment process. Summary of the invention

[0004] The present invention provides a full-process process method for preparing high-purity hydrogen and sulfur by electrochemical decomposition of hydrogen sulfide gas assisted by a medium, which eliminates hydrogen sulfide pollution while realizing the resource conversion and utilization of toxic gas hydrogen sulfide. It is an efficient and green hydrogen sulfide treatment process method.

[0005] The whole process includes three main units: oxidized media absorb hydrogen sulfide to produce sulfur, reduced media catalyze hydrogen evolution to produce high-purity hydrogen, and oxidized / reduced media electrochemical conversion. The oxidized media absorb hydrogen sulfide to produce sulfur unit uses a dedicated media, and the oxidized media composition control is used to achieve 100% absorption and conversion of hydrogen sulfide raw materials. The reduced media catalytic hydrogen evolution unit uses a dedicated hydrogen evolution catalyst to achieve complete hydrogen precipitation in the reduced media. The oxidized / reduced media electrochemical conversion unit uses a dedicated stack system to achieve the recycling of oxidized / reduced media. This process method can efficiently absorb and transform hydrogen sulfide gas to produce high-purity hydrogen and sulfur, and achieve 100% resource conversion and utilization of hydrogen sulfide gas to produce high-purity hydrogen and sulfur.

[0006] In one aspect of the present application, a full-process process for producing hydrogen and sulfur by electrochemically decomposing hydrogen sulfide assisted by a mediator is provided.

[0007] The process comprises: introducing a raw material containing hydrogen sulfide into a reaction device containing a medium and a hydrogen evolution catalyst to produce hydrogen and sulfur;

[0008] The mediator includes an oxidized mediator and a reduced mediator.

[0009] Optionally, the process comprises a sulfur production unit, an electrochemical conversion unit, and a hydrogen evolution unit connected in sequence;

[0010] The hydrogen sulfide absorption sulfur production unit comprises a hydrogen sulfide absorption reactor containing an oxidized medium; the hydrogen sulfide absorption reactor is provided with a raw material inlet, an oxidized medium inlet, an outlet I, and an outlet II;

[0011] The electrochemical conversion unit comprises a stack; the stack is provided with an anode inlet, a cathode inlet, an anode outlet, and a cathode outlet; the anode inlet is connected to the outlet II pipeline; the anode outlet is connected to the oxidized medium inlet pipeline;

[0012] An elemental sulfur separator is also provided between the anode inlet and the outlet II;

[0013] The hydrogen evolution unit comprises a catalytic hydrogen evolution reactor and a separation device;

[0014] The inlet of the hydrogen evolution reactor is communicated with the cathode outlet pipeline; the outlet of the hydrogen evolution reactor is communicated with the inlet pipeline of the separation device, and the liquid phase of the separation device is communicated with the cathode inlet pipeline.

[0015] Optionally, the hydrogen sulfide absorption sulfur production unit further includes a hydrogen sulfide eluting device, and the hydrogen sulfide eluting device is connected to the outlet I of the hydrogen sulfide absorption reactor;

[0016] The hydrogen sulfide absorption sulfur production unit also includes a pressure boosting device I-1 and a pressure boosting device I-2;

[0017] The anode outlet, the pressure boosting device I-1, and the oxidized medium inlet are connected in sequence by pipelines;

[0018] The outlet II, the pressure boosting device I-2 and the anode inlet are connected in sequence through pipelines.

[0019] Optionally, the electrochemical conversion unit further includes a booster device II-1 and a booster device II-2;

[0020] The outlet II, the pressure boosting device II-1, and the anode inlet are connected in sequence by pipelines;

[0021] The separation device, the pressure boosting device II-2, and the cathode inlet are connected in sequence by pipelines;

[0022] The electrochemical conversion unit further includes a storage device II-1, a storage device II-2, a storage device II-3, and a storage device II-4;

[0023] The anode outlet is connected to the oxidized medium inlet through a storage device II-1 pipeline;

[0024] The outlet II, the storage device II-2, and the anode inlet are connected in sequence by pipelines;

[0025] The cathode outlet, the storage device II-3, and the catalytic hydrogen evolution reactor are connected in sequence by pipelines;

[0026] The separation device, storage device II-4 and cathode inlet are connected in sequence through pipelines.

[0027] Optionally, the hydrogen evolution unit includes a pressure boosting device III-1 and a pressure boosting device III-2;

[0028] The cathode outlet, the pressure boosting device III-1, and the inlet of the catalytic hydrogen evolution reactor are connected in sequence by pipelines;

[0029] The liquid phase outlet I of the separation device, the pressurizing device III-2, and the cathode inlet are connected in sequence by pipelines;

[0030] The separation device is also provided with a gas phase outlet;

[0031] The hydrogen evolution unit further comprises a dehydration device, and the dehydration device is communicated with the gas phase outlet pipeline of the separation device.

[0032] Optionally, the process method specifically includes:

[0033] (1) A raw material containing hydrogen sulfide is introduced into a hydrogen sulfide absorption reactor containing an oxidized medium I through a raw material inlet, and is contacted with the oxidized medium I to react to obtain elemental sulfur, hydrogen ions, and a reduced medium I;

[0034] The elemental sulfur is separated and recovered by an elemental sulfur separator;

[0035] The hydrogen ions and the reduced mediator I enter the anode side of the electrochemical conversion unit through the anode inlet, and the reduced mediator I is converted into an oxidized mediator I, and returns to the hydrogen sulfide absorption reactor through the anode outlet and the oxidized mediator inlet for circulation;

[0036] The other unreacted gases enter the elution device containing the oxidized medium I through the outlet I of the hydrogen sulfide absorption reactor, and are then eluted and released;

[0037] (2) The hydrogen ions enter the cathode side of the electrochemical conversion unit, and enter the hydrogen evolution reactor containing a hydrogen evolution catalyst and a reduced medium II through the cathode outlet, undergoing a catalytic reduction reaction to generate a mixture containing hydrogen and an oxidized medium II;

[0038] The mixture is separated into gas and liquid by a separation device to produce hydrogen and an oxidized medium II;

[0039] The oxidized mediator II enters the cathode side of the electrochemical conversion unit through the cathode inlet; the oxidized mediator II is converted into a reduced mediator II, and returns to the hydrogen evolution reactor through the cathode outlet for circulation;

[0040] The hydrogen is discharged through the gas phase outlet of the separation device.

[0041] Optionally, the hydrogen sulfide absorption reactor and the hydrogen evolution reactor further include an electrolyte;

[0042] The electrolyte is selected from at least one of HNO3, H2SO4, and HCl;

[0043] The molar concentration of the electrolyte is 0.01-6 mol / L.

[0044] Optionally, the upper limit of the molar concentration of the electrolyte can be independently selected from 2 mol / L, 4 mol / L, and 6 mol / L; the lower limit can be independently selected from 0.01 mol / L, 2 mol / L, and 4 mol / L.

[0045] Optionally, the volume content of hydrogen sulfide in the raw material is 0.01 to 100%;

[0046] Optionally, the volume content of hydrogen sulfide in the raw material is 90-100%;

[0047] Optionally, the upper limit of the volume content of hydrogen sulfide can be independently selected from 10%, 30%, 50%, 80%, 100%; the lower limit can be independently selected from 0.01%, 10%, 30%, 50%, 80%;

[0048] Through this process, all toxic hydrogen sulfide gas can be absorbed and converted into resources, achieving zero emission of hydrogen sulfide gas.

[0049] Optionally, the contact reaction temperature is 0 to 90° C., and the contact reaction pressure is 0 to 2.0 MPa;

[0050] Optionally, the upper limit of the contact reaction temperature can be independently selected from 30°C, 60°C, and 90°C; the lower limit can be independently selected from 0°C, 30°C, and 60°C;

[0051] Optionally, the upper limit of the contact reaction pressure can be independently selected from 1MPa and 2MPa; the lower limit can be independently selected from 0MPa and 1MPa;

[0052] Optionally, in the electrochemical conversion unit, the working temperature of the battery stack is 0-90° C., the working pressure is 0-2.0 MPa, and the working voltage between the anode and the cathode is 0.5-5 V;

[0053] Optionally, the upper limit of the operating temperature of the battery stack can be independently selected from 30°C, 60°C, and 90°C; the lower limit can be independently selected from 0°C, 30°C, and 60°C;

[0054] Optionally, the upper limit of the working pressure can be independently selected from 1MPa and 2MPa; the lower limit can be independently selected from 0MPa and 1MPa;

[0055] Optionally, the upper limit of the working voltage between the anode and the cathode can be independently selected from 1.2V, 2.4V, 3.6V, and 5V; the lower limit can be independently selected from 0.5V, 1.2V, 2.4V, and 3.6V;

[0056] Optionally, the reaction temperature of the catalytic reduction reaction is 0 to 90° C., and the reaction pressure is 0 to 2.0 MPa;

[0057] Optionally, the upper limit of the reaction temperature can be independently selected from 30°C, 60°C, and 90°C; the lower limit can be independently selected from 0°C, 30°C, and 60°C;

[0058] Optionally, the upper limit of the reaction pressure can be independently selected from 1 MPa and 2 MPa; the lower limit can be independently selected from 0 MPa and 1 MPa.

[0059] Optionally, the hydrogen is discharged after being dehydrated by a dehydration device, and the purity of the hydrogen after simple dehydration and purification treatment is not less than 99.99%.

[0060] As a specific implementation, the method includes:

[0061] The hydrogen sulfide-containing gas enters the hydrogen sulfide absorption sulfur production unit containing an oxidized medium. In the hydrogen sulfide absorption reactor, the oxidized medium contacts and reacts with the hydrogen sulfide gas to obtain elemental sulfur and hydrogen ions, and the oxidized medium is reduced at the same time; other gases that do not participate in the reaction are purified by an elution tower containing the oxidized medium and then released; elemental sulfur is separated by centrifugation; and a mixed solution containing hydrogen ions and reduced medium enters the raw material storage tank on the anode side of the electrochemical conversion unit.

[0062] A mixed solution containing hydrogen ions and a reduced medium passes through a hydrogen evolution reactor to generate hydrogen under the action of a hydrogen evolution catalyst; the generated hydrogen is separated into gas and liquid in a gas-liquid separation tank and then dehydrated and purified to obtain high-purity hydrogen; the reduced medium is oxidized and enters the raw material storage tank on the cathode side of the electrochemical conversion unit.

[0063] On the anode side, the reduced mediator is oxidized to generate the oxidized mediator again, completing the cycle between the absorption reactor and the anode side; the hydrogen ions on the anode side pass through the electrolytic cell diaphragm to the cathode side.

[0064] On the cathode side, the oxidized mediator is reduced to generate the reduced mediator again, completing the cycle between the hydrogen evolution reactor and the cathode side.

[0065] The beneficial effects of this application include:

[0066] 1) The full-process process for preparing high-purity hydrogen and sulfur by electrochemically decomposing hydrogen sulfide assisted by a mediator provided in this application aims to provide a practical process route for the resource conversion and utilization of hydrogen sulfide with a simple process, continuity and scalability.

[0067] 2) The method provided in the present application can efficiently absorb and transform hydrogen sulfide gas to produce high-purity hydrogen and sulfur, and realize 100% resource conversion and utilization of hydrogen sulfide gas to produce high-purity hydrogen and sulfur.

[0068] 3) The full-process process and method provided in this application can accurately control the progress of each unit reaction, balance the reaction rate of each unit, effectively improve the raw material processing efficiency and reduce the operating energy consumption through the circulation of the media. Under the condition of media assistance, 100% absorption and conversion of hydrogen sulfide and production of high-purity hydrogen and sulfur are achieved, providing a practical electrochemical path and method for the resource conversion and utilization of hydrogen sulfide.

[0069] 4) The entire process of the method provided in this application is carried out in an aqueous solution. It can be carried out at normal temperature and pressure, with mild operating conditions and no hazardous gas emissions during the entire process. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] Figure 1 This is a simplified process flow diagram of this application.

[0071] in:

[0072] 1. Elution tower; 2. Hydrogen sulfide absorption reactor; 3. Booster pump I-1; 4. Booster pump I-2; 5. Hydrogen sulfide absorption raw material storage tank; 6. Electrochemical conversion unit anode side raw material storage tank; 7. Booster pump II-1; 8. Fuel cell system; 9. Booster pump II-2; 10. Hydrogen evolution raw material storage tank; 11. Cathode side raw material storage tank; 12. Booster pump III-1; 13. Booster pump III-2; 14. Hydrogen evolution reactor; 15. Gas-liquid separation tank; 16. Dehydration purifier. DETAILED DESCRIPTION

[0073] The present application is described in detail below with reference to embodiments, but the present application is not limited to these embodiments.

[0074] Unless otherwise specified, the raw materials and catalysts in the examples of this application were purchased through commercial channels.

[0075] Example 1

[0076] like Figure 1 As shown, in the present invention, the hydrogen sulfide-containing gas enters the hydrogen sulfide absorption reactor 2, the oxidized mediator contacts and reacts with the hydrogen sulfide gas to obtain elemental sulfur and hydrogen ions, and the oxidized mediator is reduced at the same time; other gases that do not participate in the reaction are purified by the oxidized mediator elution tower 1 to remove trace hydrogen sulfide gas and then released; elemental sulfur is separated by centrifugation; the mixed solution containing hydrogen ions and reduced mediators enters the anode side raw material storage tank 6 of the electrochemical conversion unit through the booster pump I-2 4, and then enters the anode side of the stack system 8 through the booster pump II-1 7 ​​to generate the oxidized mediator and then enter the hydrogen sulfide absorption raw material storage tank 5, and then enters the hydrogen sulfide absorption reactor 2 through the booster pump I-1 3 for recycling. The mixed solution containing hydrogen ions and the reduced medium passes through the hydrogen evolution reactor 14 to generate hydrogen under the action of the hydrogen evolution catalyst; the generated hydrogen is treated by the dehydration purifier 16 after completing gas-liquid separation in the gas-liquid separation tank 15 to obtain high-purity hydrogen; the reduced medium is oxidized and enters the raw material storage tank 11 on the cathode side of the electrochemical conversion unit through the booster pump III-2 13, and then enters the cathode side of the electrolyzer system 8 through the booster pump II-2 9 to generate a reduced medium and then enters the hydrogen evolution raw material storage tank 10, and then enters the hydrogen evolution reactor 14 through the booster pump III-1 12 for recycling.

[0077] Example 2

[0078] In this embodiment, 100% hydrogen sulfide gas is selected as the raw gas; 2 mol / L HCl is selected as the medium supporting electrolyte; the hydrogen sulfide absorption unit operates at a temperature of 30°C and an operating pressure of 1.0 MPa; the electrolyzer system operates at a temperature of 30°C and an operating pressure of 1.0 MPa, and the operating voltage between the anode and the cathode is 1.2 V; the hydrogen evolution unit operates at a temperature of 30°C and an operating pressure of 1.0 MPa.

[0079] 1000ml of oxidized mediator is injected into the hydrogen sulfide absorption reactor to establish circulation on the anode side; 500ml of reduced mediator is injected into the hydrogen evolution raw material storage tank to establish circulation on the cathode side; 200ml of oxidized mediator is injected into the hydrogen sulfide elution tower to establish circulation within the tower; 10ml of hydrogen evolution catalyst is loaded into the hydrogen evolution reactor.

[0080] After the system is prepared, hydrogen sulfide gas is input into the reaction system at a flow rate of 1000ml / h. The oxidized medium reacts with the hydrogen sulfide gas to precipitate light yellow elemental sulfur. The reaction progress is monitored by online sampling to control the conversion rate of the oxidized medium to be maintained in the range of 85-95%. At the same time, the stack system is connected to a 1.2V working power supply. The generated hydrogen is measured by a mass flow meter and the purity is detected online by a mass spectrometer.

[0081] The data results of the system running stably for 100 hours show: the average hydrogen production rate is 1000ml / h, and the gas purity after dehydration and purification is not less than 99.99%; the average elemental sulfur production rate is 1.3kg / h; hydrogen sulfide is completely converted, and no exhaust emissions are detected during the whole process.

[0082] Example 3

[0083] The difference from Example 2 is that in this example, a mixture of 10% hydrogen sulfide and 90% nitrogen is used as the raw gas.

[0084] The data results of the system running stably for 100 hours show: the average hydrogen production rate is 100ml / h, and the gas purity after dehydration and purification is not less than 99.99%; the average elemental sulfur production rate is 0.13kg / h; hydrogen sulfide is completely converted, and no hydrogen sulfide is detected in the relaxation gas during the whole process.

[0085] Example 4

[0086] The difference from Example 2 is that hydrogen sulfide gas is introduced into the reaction system at a flow rate of 2000 ml / h.

[0087] The data results of the system running stably for 100 hours show: the average hydrogen production rate is 2000ml / h, and the gas purity after dehydration and purification is not less than 99.99%; the average elemental sulfur production rate is 2.6kg / h; hydrogen sulfide is completely converted, and no exhaust emissions are detected during the whole process.

[0088] The above are only a few embodiments of the present application and do not constitute any form of limitation to the present application. Although the present application is disclosed as above with preferred embodiments, it is not intended to limit the present application. Any technician familiar with the profession, without departing from the scope of the technical solution of the present application, using the technical content disclosed above to make slight changes or modifications are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. A full-process process for producing hydrogen and sulfur by electrochemical decomposition of hydrogen sulfide assisted by a mediator, characterized in that: The process comprises: introducing a raw material containing hydrogen sulfide into a reaction device containing a medium and a hydrogen evolution catalyst to produce hydrogen and sulfur; The mediator includes an oxidized mediator and a reduced mediator; The reaction device comprises a hydrogen sulfide absorption sulfur production unit, an electrochemical conversion unit, and a hydrogen evolution unit connected in sequence; The hydrogen sulfide absorption sulfur production unit comprises a hydrogen sulfide absorption reactor containing an oxidized medium; the hydrogen sulfide absorption reactor is provided with a raw material inlet, an oxidized medium inlet, an outlet I, and an outlet II; The electrochemical conversion unit includes a battery stack; The medium is regulated by the battery stack; The medium is precisely controlled and efficiently recycled through the stack system; the stack is provided with an anode inlet, a cathode inlet, an anode outlet, and a cathode outlet; The anode inlet is connected to the outlet II pipeline; The anode outlet is in communication with the oxidized medium inlet pipeline; An elemental sulfur separator is also provided between the anode inlet and the outlet II; The hydrogen evolution unit comprises a catalytic hydrogen evolution reactor and a separation device; The inlet of the hydrogen evolution reactor is in communication with the cathode outlet pipeline; The outlet of the hydrogen evolution reactor is in communication with the inlet pipeline of the separation device, and the liquid phase outlet of the separation device is in communication with the cathode inlet pipeline; The process specifically comprises: (1) A raw material containing hydrogen sulfide is introduced into a hydrogen sulfide absorption reactor containing an oxidized medium I through a raw material inlet, and reacts with the oxidized medium I to obtain elemental sulfur, hydrogen ions and reduced medium I; The elemental sulfur is separated and recovered by an elemental sulfur separator; The hydrogen ions and the reduced mediator I enter the anode side of the electrochemical conversion unit through the anode inlet, and the reduced mediator I is converted into an oxidized mediator I, and returns to the hydrogen sulfide absorption reactor through the anode outlet and the oxidized mediator inlet for circulation; The other unreacted gases enter the elution device containing the oxidized medium I through the outlet I of the hydrogen sulfide absorption reactor, and are then eluted and released; (2) The hydrogen ions enter the cathode side of the electrochemical conversion unit, and enter the hydrogen evolution reactor containing a hydrogen evolution catalyst and a reduced medium II through the cathode outlet, undergoing a catalytic reduction reaction to generate a mixture containing hydrogen and an oxidized medium II; The mixture is separated into gas and liquid by a separation device to produce hydrogen and an oxidized medium II; The oxidized mediator II enters the cathode side of the electrochemical conversion unit through the cathode inlet; the oxidized mediator II is converted into a reduced mediator II, and returns to the hydrogen evolution reactor through the cathode outlet for circulation; The hydrogen is discharged through the gas phase outlet of the separation device; The sulfur production unit includes a pressure boosting device I-1 and a pressure boosting device I-2; The electrochemical conversion unit includes a pressure boosting device II-1 and a pressure boosting device II-2; The electrochemical conversion unit further includes a storage device II-1, a storage device II-2, a storage device II-3, and a storage device II-4; The hydrogen evolution unit comprises a pressure boosting device III-1 and a pressure boosting device III-2; The contact reaction temperature is 0-90°C, and the contact reaction pressure is 0-2.0MPa; In the electrochemical conversion unit, the working temperature of the battery stack is 0~90 ˚C, the working pressure is 0~2.0 MPa, and the working voltage between the anode and the cathode is 0.5~5V; The reaction temperature of the catalytic reduction reaction is 0-90°C and the reaction pressure is 0-2.0MPa; In the process, the conversion rate of the oxidized medium is controlled to be maintained in the range of 85-95%; The hydrogen sulfide absorption sulfur production unit also includes a hydrogen sulfide eluting device; The hydrogen evolution unit also includes a dehydration purification device.

2. The process according to claim 1, characterized in that: The hydrogen sulfide eluting device is connected to the outlet I of the hydrogen sulfide absorption reactor; The anode outlet, the pressure boosting device I-1, and the oxidized medium inlet are connected in sequence by pipelines; The outlet II, the pressure boosting device I-2 and the anode inlet are connected in sequence through pipelines.

3. The process according to claim 1, characterized in that: The outlet II, the pressure boosting device II-1, and the anode inlet are connected in sequence by pipelines; The separation device, the pressure boosting device II-2, and the cathode inlet are connected in sequence by pipelines; The anode outlet is connected to the oxidized medium inlet through a storage device II-1 pipeline; The outlet II, the storage device II-2, and the anode inlet are connected in sequence by pipelines; The cathode outlet, the storage device II-3, and the catalytic hydrogen evolution reactor are connected in sequence by pipelines; The separation device, storage device II-4 and cathode inlet are connected in sequence through pipelines.

4. The process according to claim 1, characterized in that: The cathode outlet, the pressure boosting device III-1, and the inlet of the catalytic hydrogen evolution reactor are connected in sequence by pipelines; The liquid phase outlet I of the separation device, the pressurizing device III-2, and the cathode inlet are connected in sequence by pipelines; The separation device is also provided with a gas phase outlet; The dehydration purification device is communicated with the gas phase outlet pipeline of the separation device.

5. The process according to claim 1, characterized in that: The hydrogen sulfide absorption reactor and the hydrogen evolution reactor further include an electrolyte; The electrolyte is selected from at least one of HNO3, H2SO4, and HCl; The molar concentration of the electrolyte is 0.01-6 mol / L.

6. The process according to claim 1, characterized in that: In the raw material, the volume content of hydrogen sulfide is 0.01~100%.

7. The process according to claim 6, characterized in that: The volume content of hydrogen sulfide in the raw material is 90-100%.

8. The process according to claim 1, characterized in that: The hydrogen is discharged after being dehydrated by a dehydration purification device.

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