A neutral high-purity hydrogen peroxide synthesis system based on a yin-yang film solid electrolyte

Abstract

The utility model discloses a kind of neutral high-purity hydrogen peroxide synthesis systems based on yin-yang film solid electrolyte, it is related to hydrogen peroxide synthesis field, three-cavity electrolytic cell including electrolytic unit adopts yin-yang film and solid electrolyte combination structure, groove body is divided into anode, intermediate, cathode chamber, each is equipped with inlet and outlet and gas port, realize reaction space and material transport channel.Cathode gas supply unit is transported oxygen to cathode cavity by oxygen production device, check valve, flowmeter;Intermediate cavity overflow unit realizes product continuous collection;Anode circulating unit constitutes anode liquid closed loop circulation;Oxygen recycling unit recycles and separates oxygen;Liquid supplement unit maintains liquid level balance;Control unit overall adjustment parameter, realize automated accurate operation.The utility model can efficiently electric synthesis high-purity hydrogen peroxide, with the characteristics of low energy consumption, product pure, operation stable, environmental protection good, suitable for preparation demand in chemical industry, environmental protection and other fields, can realize the continuous synthesis and intelligent control of neutral high-purity hydrogen peroxide.

Description

Technical Field

[0001] This utility model relates to the field of hydrogen peroxide synthesis technology, and more specifically to a neutral high-purity hydrogen peroxide synthesis system based on anion and cation membrane solid electrolyte. Background Technology

[0002] Currently, hydrogen peroxide, as an important inorganic chemical product, is widely used in many fields such as chemical synthesis, environmental protection, medical and health care, and food processing. The demand for high-purity hydrogen peroxide is particularly urgent in the electronics industry and high-end pharmaceuticals.

[0003] Currently, the mainstream method for industrial preparation of hydrogen peroxide is the anthraquinone process. However, the anthraquinone process has many limitations: it requires the use of a large amount of organic solvents, which can easily cause environmental pollution; the impurities generated during the reaction are difficult to remove completely, resulting in limited product purity; and the process is complex, with high equipment investment and operating costs.

[0004] Besides the anthraquinone method, electrolysis is also an important route for preparing hydrogen peroxide. Traditional electrolysis methods mostly use acidic or alkaline electrolytes, which have problems such as strong electrolyte corrosivity and high equipment requirements. At the same time, side reactions (such as the generation of oxygen and hydrogen) are prone to occur during electrolysis, resulting in reduced current efficiency, and electrolyte impurities are easily mixed into the product, making it difficult to obtain high-purity hydrogen peroxide.

[0005] In addition, the existing electrolysis equipment is often poorly designed and lacks an effective mechanism for material separation and recycling, resulting in low raw material utilization and difficulty in product collection, which further limits the improvement of hydrogen peroxide purity and production efficiency.

[0006] Therefore, how to provide a hydrogen peroxide electrosynthesis system that can operate under neutral conditions, produces high-purity products, consumes little energy, and is environmentally friendly is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0007] In view of this, the present invention provides a neutral high-purity hydrogen peroxide synthesis system based on anion-ion membrane solid electrolyte to solve the problems existing in the background art.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: A neutral high-purity hydrogen peroxide synthesis system based on anion and cation membrane solid electrolyte includes an electrolysis unit, a cathode gas supply unit, an intermediate cavity flow unit, an anode circulation unit, an oxygen recovery unit, a liquid replenishment unit, and a control unit. The electrolysis unit is used to electrolyze and generate hydrogen peroxide. The electrolysis unit includes a DC power supply and an electrolytic cell. The electrolytic cell is composed of a structure consisting of an anode and cathode membranes and a solid electrolyte, which are divided into three chambers: an anode chamber, an intermediate chamber, and a cathode chamber. The cathode gas supply unit is used to continuously supply oxygen, the reactant, to the cathode chamber; The intermediate cavity flow unit is used to supply deionized water to the intermediate cavity and collect the generated hydrogen peroxide; The anode circulation unit is used to circulate the anolyte to maintain the efficiency of the anode reaction, while removing the oxygen produced by the reaction. The oxygen recycling unit is used to recover oxygen generated at the anode. The replenishment unit is used to maintain the liquid level balance of the anode circulation unit and replenish the water consumed during electrolysis. The control unit is used to control each unit.

[0009] Optionally, the anode chamber is provided with an anode inlet and an anode outlet, the cathode chamber is provided with a cathode gas inlet and a cathode gas outlet, and the intermediate chamber is provided with an intermediate chamber inlet and a hydrogen peroxide outlet; the anode chamber and the intermediate chamber are selectively ion-isolated by an anode membrane, and an anode mass transfer diffusion layer is provided in the anode chamber to enhance the mass transfer efficiency of the electrolyte; the intermediate chamber is filled with a porous solid electrolyte to form a reaction environment for the generation and enrichment of hydrogen peroxide; the cathode chamber and the intermediate chamber are selectively isolated by a cathode membrane, and a cathode electrode is provided in the cathode chamber to provide active sites for the reduction of oxygen to generate hydrogen peroxide ions.

[0010] Optionally, the cathode gas supply unit includes an oxygen generating device, a one-way valve, and a flow meter. The oxygen generated by the oxygen generating device is delivered to the cathode chamber through the cathode inlet after passing through the one-way valve and the flow meter.

[0011] Optionally, the intermediate cavity flow unit includes a pure water tank, a first metering pump, a first flow meter, and a product tank; the outlet of the pure water tank is connected to the first metering pump and the first flow meter in sequence through pipelines, and then connected to the intermediate cavity inlet of the electrolytic cell, with a one-way valve installed on the pipeline near the intermediate cavity inlet; the intermediate cavity outlet of the electrolytic cell is directly connected to the inlet of the product tank through a pipeline, with a sampling valve installed on the pipeline near the product tank.

[0012] Optionally, the anode circulation unit includes an anode liquid tank, a second metering pump, a second flow meter, and a gas-liquid separator; the anode liquid tank is connected to the second metering pump and the second flow meter in sequence via pipelines, and then connected to the anode inlet of the electrolytic cell; the anode outlet of the electrolytic cell is connected to the inlet of the gas-liquid separator via pipelines; the liquid phase outlet of the gas-liquid separator returns to the anode liquid tank via pipelines, forming a circulation loop; its gas phase outlet is connected to the subsequent oxygen recovery unit.

[0013] Optionally, the oxygen recycling unit consists of a gas-liquid separator, an oxygen storage tank, and a pressure regulating device. The oxygen separated by the gas-liquid separator is compressed and collected in the oxygen storage tank. The oxygen storage tank is connected to the outlet pipeline of the oxygen generator of the cathode gas supply unit through the pressure regulating device. After pressure matching, they are connected to the cathode inlet to achieve coordinated supply of recovered oxygen and oxygen produced by the oxygen generator.

[0014] Optionally, the anode membrane is a perfluorosulfonic acid proton exchange membrane with a thickness of 50-150 μm, and the loading of the anode catalyst on the perfluorosulfonic acid proton exchange membrane is 0.2-0.8 mg / cm³. 2 The cathode membrane is an anion exchange membrane with a thickness of 50-150 μm.

[0015] Optionally, the anode mass transfer diffusion layer is made of titanium fiber felt with a thickness of 0.1-0.5 mm, the cathode electrode is a gas diffusion layer electrode with a thickness of 0.1-0.4 mm, and the cathode catalyst loading on the carbon paper is 10-30 mg / cm³. 2 .

[0016] Optionally, the control unit includes a PLC controller, a touch screen, and a sensor group; the PLC controller triggers a replenishment valve or a power failure protection module based on sensor data; the sensor group includes flow sensors, pressure sensors, temperature sensors, liquid level sensors installed in each pipeline, and a voltage sensor installed in the electrolytic cell.

[0017] As can be seen from the above technical solution, compared with the prior art, this utility model discloses a neutral high-purity hydrogen peroxide synthesis system based on anion and cation membrane solid electrolyte, which has the following beneficial effects: 1. Employing an anion-cation membrane solid electrolyte structure, the anion and cation membranes work together to achieve directional ion migration during electrolysis, directly generating neutral high-purity hydrogen peroxide (H2O2) without the need for additional neutralization steps, avoiding the introduction of impurities and significantly improving the applicability of the product; 2. By using a gas separation and storage device, the oxygen generated at the anode is recovered and recycled as a cathode reaction gas, which greatly reduces raw material consumption and waste gas emissions, achieving green synthesis with near-zero waste gas.

[0018] 3. Multi-sensor linkage control, real-time monitoring of voltage, current, temperature and liquid level parameters: avoids the decrease in electrolysis efficiency caused by excessive voltage; dynamic liquid replenishment prevents the risk of dry burning caused by excessively low water level; temperature over-limit warning and intervention ensure the continuous and stable operation of the system. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0020] Figure 1 A schematic diagram of the system structure provided by this utility model; Figure 2 This is a schematic diagram of the electrolytic cell structure provided by this utility model. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] This utility model discloses a neutral high-purity hydrogen peroxide synthesis system based on anion-cation membrane solid electrolyte, used for the continuous and stable production of electronic-grade high-purity hydrogen peroxide aqueous solution. For example... Figure 1 As shown, it mainly includes an electrolysis unit, a cathode gas supply unit, an intermediate cavity flow unit, an anode circulation unit, an oxygen recovery unit, a liquid replenishment unit, and a control unit. The various units are linked through pipelines, circuits, and industrial-grade signal lines to form a closed-loop production system, enabling continuous synthesis and intelligent control of neutral, high-purity hydrogen peroxide.

[0023] The electrolysis unit is used to electrolyze and generate hydrogen peroxide. The electrolysis unit includes a DC power supply and an electrolytic cell. The electrolytic cell is composed of a structure consisting of an anode and cathode membranes and a solid electrolyte, which are divided into three chambers: the anode chamber, the intermediate chamber, and the cathode chamber. The cathode gas supply unit is used to continuously supply oxygen, the reactant, to the cathode chamber; The intermediate cavity flow unit is used to supply deionized water to the intermediate cavity and collect the generated hydrogen peroxide; The anode circulation unit is used to circulate the anolyte to maintain the efficiency of the anode reaction, while removing the oxygen produced by the reaction. The oxygen recycling unit is used to recover oxygen generated at the anode; The replenishment unit is used to maintain the liquid level balance of the anode circulation unit and replenish the water consumed during electrolysis. The control unit is used to control each unit.

[0024] The various devices are linked through pipelines, circuits, and industrial-grade signal lines to form a closed-loop production system, enabling continuous synthesis and intelligent control of neutral high-purity hydrogen peroxide.

[0025] The system structure and connections are as follows: 1.1 Electrolysis Unit This unit is the core of the system. For example... Figure 2 As shown, it includes a DC regulated power supply and a three-chamber electrolytic cell.

[0026] The electrolytic cell has a rectangular structure with a PTFE outer shell. Internally, a three-chamber structure isolates the electrochemical reaction from directional mass transfer. The three chambers, from left to right, are the anode chamber, the intermediate chamber, and the cathode chamber, as detailed below: Anode chamber: Separated from the solid electrolyte resin chamber by a perfluorosulfonic acid proton exchange membrane (anode membrane, 80 μm thick), with an effective membrane area of ​​0.005 m². An anode mass transfer diffusion layer (85% porosity, 0.2 mm thickness) made of titanium fiber felt is installed inside the chamber, connected to a titanium alloy current collector, serving as the anode for the electrolysis reaction. During operation, pure water electrolyte supplied by the anode inlet storage device is introduced into the anode chamber, where a water oxidation reaction (OER) occurs under the influence of an electric field: 2... O-4 = ↑+4 The generated oxygen is discharged from the anode outlet along with the electrolyte at a flow rate of 40 mL / min. The oxygen is then separated and stored by a gas-liquid separator for use as a feedstock for the cathode reaction. The electrolyte is then recycled into the anode inlet storage tank. It then migrates directionally to the solid electrolyte resin chamber through the anode membrane.

[0027] Intermediate chamber: Filled with a porous solid electrolyte (such as a strong acid ion exchange resin, particle size 0.5-1 mm), with a packing density of 0.13 g / cm³. Its function is to connect the anode and cathode via ion conduction, allowing ions to migrate from the anode chamber... With HO2 migrating from the cathode chamber - High-purity H2O2 is generated here.

[0028] Cathode chamber: Separated from the intermediate chamber by an anion exchange membrane (cathode membrane, 60 μm thick), the effective area of ​​which is the same as that of the anode membrane. A cathode electrode (0.3 mm thick) made of gas diffusion layer electrode material is installed within the chamber. The gas diffusion layer electrode is coated with a carbon-supported catalyst, preferably at a loading of 20 mg / cm². During operation, oxygen generated from the anode reaction is introduced into the cathode chamber through the inlet. The gas flow rate is controlled at 1 L / min by a mass flow meter, and the oxygen reduction reaction (ORR) occurs under the action of the catalyst. +2 O+2 =HO2 - +2O The generated HO2 - They migrate directionally through the cathode membrane to the intermediate chamber, where they interact with H. + This combination generates high-purity H2O2.

[0029] Chamber interface: The cathode chamber is equipped with a cathode air inlet and a cathode air outlet.

[0030] The intermediate chamber is equipped with an intermediate chamber inlet and an intermediate chamber outlet.

[0031] The anode chamber is equipped with an anode inlet and an anode outlet.

[0032] The positive and negative terminals of the DC power supply are electrically connected to the anode and cathode plates of the electrolytic cell, respectively.

[0033] 1.2 Cathode Gas Supply Unit

[0034] This unit continuously supplies oxygen, the reactant, to the cathode. It includes an oxygen generator, a check valve, and a gas flow meter. The outlet of the oxygen generator is connected in sequence to the check valve and the inlet of the gas flow meter via piping. The outlet of the gas flow meter is connected to the cathode inlet of the electrolytic cell via piping, entering the cathode chamber. By adjusting the flow rate of the flow meter, the amount of oxygen entering the cathode chamber is controlled to meet the requirements of the electrosynthesis reaction. The check valve effectively prevents gas backflow, ensuring the safe operation of the system.

[0035] 1.3 Intermediate cavity flow unit

[0036] This unit supplies deionized water to the intermediate chamber and collects the generated hydrogen peroxide product. It includes a pure water tank, a first metering pump, a first flow meter, and a product tank. The product tank is a 100L polytetrafluoroethylene (PTFE) storage tank to prevent hydrogen peroxide decomposition. The outlet of the pure water tank is connected sequentially to the first metering pump and the first flow meter via pipelines, and then connected to the inlet of the intermediate chamber of the electrolyzer. A one-way valve is installed on the pipeline near the inlet of the intermediate chamber. The outlet of the intermediate chamber of the electrolyzer is directly connected to the inlet of the product tank via a pipeline, and a sampling valve is installed on the pipeline near the product tank.

[0037] 1.4 Anode Circulation Unit

[0038] This unit is used to circulate the anolyte to maintain the efficiency of the anolyte reaction while removing the oxygen produced by the reaction. It includes an anolyte tank, a second metering pump, a second flow meter, and a gas-liquid separator. The anolyte tank is made of plastic to avoid the introduction of metal impurities that could cause side reactions. The anolyte tank contains 1L of pure water electrolyte. The anolyte tank is connected to the second metering pump and the second flow meter via pipelines, and then connected to the anode inlet of the electrolytic cell. The anode outlet of the electrolytic cell is connected to the inlet of the gas-liquid separator via pipelines. The liquid phase outlet of the gas-liquid separator returns to the anolyte tank via pipelines, forming a circulation loop; its gas phase outlet is connected to the subsequent oxygen recovery unit. An immersion-type liquid level sensor (measuring range 0-100cm, accuracy ±0.5cm) is installed in the anolyte tank. When the liquid level is below 5cm, the control device triggers the replenishment valve to automatically add pure water electrolyte from the raw material tank. The replenishment amount is measured by an electromagnetic flow meter to ensure the liquid level remains stable at 30-50cm. The gas-liquid separator has a vertical structure with a diameter of 15cm and a height of 50cm.

[0039] When the anode circulation unit is running, the anode electrolyte to be circulated in the anode tank is powered by the circulation pump and transported to the anode chamber through the anode inlet to participate in the reaction. The gas-liquid mixture formed after the reaction is discharged from the anode outlet and directly enters the gas-liquid separation device for component separation. The separated liquid flows back to the anode tank along the preset circuit to complete a single circulation process.

[0040] 1.5 Oxygen Recycling Unit

[0041] This unit is used to recover oxygen generated at the anode, improving raw material utilization and ensuring safety. It consists of a gas-liquid separator, an oxygen storage tank, and a pressure regulating device. The oxygen storage tank (50L volume, 0.3MPa operating pressure) is equipped with a pressure sensor with a measurement range of 0-1MPa. Gas from the gas phase outlet of the gas-liquid separator is connected to the inlet of the separator for further drying and purification. The gas phase outlet of the gas-liquid separator is connected to the inlet of the oxygen storage tank via a pipeline. The outlet of the oxygen storage tank is connected via a branch pipeline, supplemented by a regulating valve, to the pipeline at the end of the oxygen generation unit in the cathode gas supply unit, achieving oxygen recycling. This ensures both the smooth flow of oxygen recovery and adapts to the gas pressure requirements of the cathode reaction through pressure regulation.

[0042] 1.6 Liquid replenishment unit

[0043] This unit is used to maintain the liquid level balance of the anode circulation unit and replenish the water consumed during electrolysis. It includes a makeup water tank and a feed pump. The outlet of the makeup water tank is connected to the anode liquid tank via the feed pump. The anode liquid tank has an overflow port at the top, which is connected to the wastewater treatment device via pipeline to discharge excess liquid and maintain the system's water balance.

[0044] System Workflow

[0045] Pre-start checks: Confirm that all devices are securely connected, control device parameters are set correctly (constant current, current density 100mA / cm²), and all valves are in their initial state (replenishment valve closed, circulation valve open). Start the system control unit.

[0046] The cathode gas supply unit starts, and high-purity oxygen (concentration >93%) generated by the oxygen generator is introduced into the cathode chamber at a constant flow rate of 2 L / min (monitored and controlled by a flow meter). The intermediate chamber flow unit starts, and the first metering pump delivers ultrapure water (resistivity >18.2 MΩ·cm) from the pure water tank into the intermediate chamber at a flow rate of 20 mL / min. The anode circulation unit starts, and the second metering pump delivers pure water from the anolyte tank into the anode chamber for circulation at a flow rate of 50 mL / min.

[0047] The DC power supply starts up and applies a constant current.

[0048] Electrolysis reaction: When the electrolytic cell starts working, water oxidation occurs at the anode to produce oxygen, and oxygen reduction occurs at the cathode to produce hydrogen peroxide. and HO2 Hydrogen peroxide is generated by the directional migration of the anion and cation membranes into the solid electrolyte chamber, and the control device collects various parameters in real time during the reaction.

[0049] Product collection: The neutral high-purity hydrogen peroxide solution (pH 7.0±1) generated in the intermediate chamber continuously flows out from the outlet of the intermediate chamber and enters the product tank. The product concentration can be detected periodically through the sampling valve.

[0050] Gas treatment: Oxygen carried in the anolyte is separated in a gas-liquid separator. The liquid is returned to the anolyte tank, while the gas is dried by the gas-liquid separator and stored in an oxygen storage tank, and can be reused in the cathode gas supply line. Incompletely reacted tail gas from the cathode is discharged from the cathode outlet and can be piped outdoors or subjected to other safe treatment.

[0051] Water balance control: As the reaction proceeds, the anolyte will be consumed. The feed pump in the replenishment unit is activated based on the liquid level signal of the anolyte tank to replenish the tank with pure water and maintain a stable liquid level.

[0052] System Control and Shutdown: The control device automatically replenishes liquid, adjusts temperature, or triggers protection mechanisms based on sensor data. When shutdown is required, first disconnect the power supply to the electrolytic cell, continue liquid and gas circulation for 3 minutes, then shut off the liquid inlet pump and gas circulation system. Finally, turn off the main power supply and clean the sampling valve and filter.

[0053] Implementation effect

[0054] Using the system described in this embodiment, under the conditions of a controlled current density of 100 mA / cm², a pure water flow rate of 4 mL / min in the anode chamber, a pure water flow rate of 3 mL / min in the intermediate chamber, and an oxygen flow rate of 70 mL / min at the cathode, samples were taken from the product tank for analysis after 24 hours of continuous operation at room temperature. The hydrogen peroxide concentration was determined by potassium permanganate titration and remained stable at approximately 3.5 wt.%. Inductively coupled plasma mass spectrometry (ICP-MS) analysis showed that the content of any single metal impurity in the product was less than 10 ppb, meeting electronic grade standards. The system operated stably, with the cell voltage maintained below 12.0 V, demonstrating good energy efficiency and product purity.

[0055] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0056] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A neutral high-purity hydrogen peroxide synthesis system based on anion-ion membrane solid electrolyte, characterized in that, It includes an electrolysis unit, a cathode gas supply unit, an intermediate cavity flow control unit, an anode circulation unit, an oxygen recovery unit, a liquid replenishment unit, and a control unit; The electrolysis unit is used to electrolyze and generate hydrogen peroxide. The electrolysis unit includes a DC power supply and an electrolytic cell. The electrolytic cell is composed of a structure consisting of an anode and cathode membranes and a solid electrolyte, which are divided into three chambers: an anode chamber, an intermediate chamber, and a cathode chamber. The cathode gas supply unit is used to continuously supply oxygen, the reactant, to the cathode chamber; The intermediate cavity flow unit is used to supply deionized water to the intermediate cavity and collect the generated hydrogen peroxide; The anode circulation unit is used to circulate the anolyte to maintain the efficiency of the anode reaction, while removing the oxygen produced by the reaction. The oxygen recycling unit is used to recover oxygen generated at the anode. The replenishment unit is used to maintain the liquid level balance of the anode circulation unit and replenish the water consumed during electrolysis. The control unit is used to control each unit.

2. The neutral high-purity hydrogen peroxide synthesis system based on anion-cation membrane solid electrolyte as described in claim 1, characterized in that, The anode chamber is provided with an anode inlet and an anode outlet, the cathode chamber is provided with a cathode gas inlet and a cathode gas outlet, and the intermediate chamber is provided with an intermediate chamber inlet and a hydrogen peroxide outlet. The anode chamber and the intermediate chamber are selectively ion-isolated by an anode membrane, and an anode mass transfer diffusion layer is provided in the anode chamber to enhance the mass transfer efficiency of the electrolyte. The intermediate chamber is filled with a porous solid electrolyte to form a reaction environment for the generation and enrichment of hydrogen peroxide. The cathode chamber and the intermediate chamber are selectively isolated by a cathode membrane, and a cathode electrode is provided in the cathode chamber to provide active sites for the reduction of oxygen to generate hydrogen peroxide ions.

3. The neutral high-purity hydrogen peroxide synthesis system based on anion-cation membrane solid electrolyte as described in claim 1, characterized in that, The cathode gas supply unit includes an oxygen generating device, a one-way valve, and a flow meter. The oxygen generated by the oxygen generating device is delivered to the cathode chamber through the cathode inlet after passing through the one-way valve and the flow meter.

4. The neutral high-purity hydrogen peroxide synthesis system based on anion-cation membrane solid electrolyte as described in claim 1, characterized in that, The intermediate cavity flow unit includes a pure water tank, a first metering pump, a first flow meter, and a product tank. The outlet of the pure water tank is connected to the first metering pump and the first flow meter in sequence through pipelines, and then connected to the intermediate cavity inlet of the electrolytic cell. A one-way valve is installed on the pipeline near the intermediate cavity inlet. The intermediate cavity outlet of the electrolytic cell is directly connected to the inlet of the product tank through a pipeline. A sampling valve is installed on the pipeline near the product tank.

5. The neutral high-purity hydrogen peroxide synthesis system based on anion and cation membrane solid electrolytes according to claim 1, characterized in that, The anode circulation unit includes an anode liquid tank, a second metering pump, a second flow meter, and a gas-liquid separator. The anode liquid tank is connected to the second metering pump and the second flow meter in sequence via pipelines, and then connected to the anode inlet of the electrolytic cell. The anode outlet of the electrolytic cell is connected to the inlet of the gas-liquid separator via pipelines. The liquid phase outlet of the gas-liquid separator returns to the anode liquid tank via pipelines, forming a circulation loop. Its gas phase outlet is connected to the subsequent oxygen recovery unit.

6. The neutral high-purity hydrogen peroxide synthesis system based on anion-cation membrane solid electrolyte according to claim 1, characterized in that, The oxygen recycling unit consists of a gas-liquid separator, an oxygen storage tank, and a pressure regulating device. The oxygen separated by the gas-liquid separator is compressed and collected in the oxygen storage tank. The oxygen storage tank is connected to the outlet pipeline of the oxygen generator of the cathode gas supply unit through the pressure regulating device. After pressure matching, they are connected to the cathode inlet to achieve coordinated supply of recovered oxygen and oxygen produced by the oxygen generator.

7. The neutral high-purity hydrogen peroxide synthesis system based on anion-cation membrane solid electrolyte according to claim 2, characterized in that, The anode membrane is a perfluorosulfonic acid proton exchange membrane with a thickness of 50-150 μm, and the loading of the anode catalyst on the perfluorosulfonic acid proton exchange membrane is 0.2-0.8 mg / cm³. 2 The cathode membrane is an anion exchange membrane with a thickness of 50-150 μm.

8. The neutral high-purity hydrogen peroxide synthesis system based on anion-cation membrane solid electrolyte according to claim 2, characterized in that, The anode mass transfer diffusion layer is made of titanium fiber felt with a thickness of 0.1-0.5 mm, the cathode electrode is a gas diffusion layer electrode with a thickness of 0.1-0.4 mm, and the cathode catalyst loading on carbon paper is 10-30 mg / cm³. 2 .

9. The neutral high-purity hydrogen peroxide synthesis system based on anion-cation membrane solid electrolyte as described in claim 1, characterized in that, The control unit includes a PLC controller, a touch screen, and a sensor group; the PLC controller triggers the replenishment valve or power failure protection module based on sensor data; the sensor group includes flow sensors, pressure sensors, temperature sensors, liquid level sensors installed in each pipeline, and a voltage sensor installed in the electrolytic cell.

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