Sandwich type hydrogen peroxide preparation electrolytic bath

Abstract

The utility model discloses a sandwich type hydrogen peroxide preparation electrolytic bath which comprises a front panel and a rear panel which are spliced with each other, two groups of collector plates are arranged between the front panel and the rear panel, at least one group of electrolysis electrodes are arranged between the two groups of collector plates, and bipolar plates are respectively arranged on two sides of the electrolysis electrodes. A liquid flow channel and a gas flow channel are respectively arranged on two opposite side surfaces of the bipolar plate; the edges of the two sides of the electrolysis electrode are each provided with a distribution part, one end of each distribution part is connected with the gas flow channel or the liquid flow channel, and the other end of each distribution part leads to the center position of the electrolysis electrode; the hydrogen peroxide preparation device can safely and stably prepare hydrogen peroxide, and the efficiency of hydrogen peroxide preparation through electrolysis is remarkably improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of electrolytic preparation of hydrogen peroxide, and specifically relates to a sandwich-type electrolytic cell for preparing hydrogen peroxide. Background Technology

[0002] Currently, the main industrial and laboratory technologies for preparing hydrogen peroxide include the anthraquinone method, the direct hydrogen-oxygen synthesis method, and the traditional electrolysis method. Among these, the anthraquinone method, as the mainstream process, generates hydrogen peroxide through the hydrogenation and oxidation cycle of anthraquinone compounds. It requires organic solvents as the reaction medium and involves complex multi-step processes such as hydrogenation, oxidation, extraction, and regeneration. The direct hydrogen-oxygen synthesis method involves the direct reaction of hydrogen and oxygen under the action of a catalyst to produce hydrogen peroxide. However, this method has stringent requirements for reaction conditions (such as pressure, temperature, and raw material purity), posing safety risks, and it is difficult to simultaneously ensure the selectivity and stability of the catalyst. Traditional electrolysis methods often employ a single-electrode electrolyzer structure, with a relatively loose assembly of electrodes and membrane components. Fluid distribution relies mainly on a simple flow channel design, typically with only a single inlet and outlet, without forming a dedicated fluid distribution area. The adhesion between the electrode material and the ion exchange membrane is insufficient, often requiring additional clamping structures to ensure mass transfer efficiency.

[0003] Therefore, in view of the above-mentioned defects of existing hydrogen peroxide electrolyzers, this utility model discloses a sandwich-type hydrogen peroxide preparation electrolyzer. Utility Model Content

[0004] This utility model discloses a sandwich-type hydrogen peroxide preparation electrolytic cell, which can safely and stably prepare hydrogen peroxide and significantly improve the efficiency of hydrogen peroxide preparation by electrolysis.

[0005] This utility model is achieved through the following technical solution:

[0006] A sandwich-type hydrogen peroxide preparation electrolyzer includes a front panel and a rear panel that are joined together. Two sets of current collectors are disposed between the front panel and the rear panel. At least one set of electrolytic electrodes is disposed between the two sets of current collectors. Bipolar plates are disposed on both sides of the electrolytic electrodes. Liquid channels and gas channels are respectively disposed on the two opposite sides of the bipolar plates. Distribution sections are disposed at the edges of both sides of the electrolytic electrodes. One end of the distribution section is connected to the gas channel or the liquid channel, and the other end of the distribution section leads to the center of the electrolytic electrode.

[0007] Water is introduced into the liquid channel on one side of the bipolar plate as a raw material for the electrolysis reaction, while air is introduced into the gas channel on the other side to provide oxygen for the hydrogen peroxide preparation reaction. The cathode of the electrolytic electrode is positioned opposite the gas channel, and the anode is positioned opposite the liquid channel. By providing a distribution section at the edge of the electrolytic electrode, air in the gas channel is uniformly guided and distributed to the cathode, and water in the liquid channel is uniformly guided and distributed to the anode.

[0008] To better realize this utility model, the electrolytic electrode further includes carbon paper, a frame assembly, an ion exchange membrane assembly, and a titanium felt. The ion exchange membrane assembly is installed inside the frame assembly, the carbon paper is installed on the side of the frame assembly near the gas flow channel, and the titanium felt is installed on the side of the frame assembly near the liquid flow channel.

[0009] To better realize this utility model, the ion exchange membrane further includes a porous membrane and an Nfion membrane. The frame assembly has a stepped positioning groove inside, and the porous membrane and the Nfion membrane are installed inside the stepped positioning groove. The porous membrane is positioned close to the carbon paper, and the Nfion membrane is positioned close to the titanium felt.

[0010] To better realize this utility model, further, the central area of ​​the frame assembly near the ion exchange membrane is provided with a membrane limiting area corresponding to the ion exchange membrane, and an annular sealing groove is provided around the outside of the membrane limiting area, and a first sealing ring is installed inside the annular sealing groove; the distribution part is provided in the area between the membrane limiting area and the annular sealing groove, one end of the distribution part is connected to the gas flow channel or the liquid flow channel through the connecting groove, and the other end of the distribution part leads to the membrane limiting area.

[0011] To better realize this utility model, the distribution part further includes a distribution opening, and a plurality of diversion grooves are evenly arranged inside the distribution opening.

[0012] To better realize this utility model, further, a carbon paper inlay groove is provided on the side of the frame assembly near the carbon paper, and carbon paper is inlaid inside the carbon paper inlay groove; a titanium felt inlay groove is provided on the side of the frame assembly near the titanium felt, and titanium felt is inlaid inside the titanium felt inlay groove.

[0013] To better realize this utility model, a gas flow channel is provided on one side of the bipolar plate, and a liquid flow channel is provided on the other side of the bipolar plate. The gas flow channel and the liquid flow channel are serpentine flow channels or mesh flow channels.

[0014] To better realize this utility model, a second sealing ring is further provided between the bipolar plate and the electrolytic electrode, and the gas flow channel and liquid flow channel are located in the inner area of ​​the second sealing ring.

[0015] To better realize this utility model, the front panel further includes a front end plate and a front insulating plate, wherein the front insulating plate is disposed between the front end plate and the current collector plate.

[0016] To better realize this utility model, the rear panel further includes a rear end plate and a rear insulating plate, wherein the rear insulating plate is disposed between the rear end plate and the current collector plate.

[0017] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0018] (1) This utility model adopts an integrated assembly structure, which does not require complicated auxiliary processes. Compared with the anthraquinone method, it greatly simplifies the process steps and significantly reduces equipment investment and operating costs. At the same time, the ion exchange membrane is precisely fixed by the step positioning groove on the frame assembly, which does not require an additional clamping structure, simplifies the assembly process and improves the assembly efficiency.

[0019] (2) This utility model combines the gas flow channel and liquid flow channel on the bipolar plate with the distribution part on the frame assembly. The distribution part realizes the uniform distribution and stable flow guidance of the reaction fluid, avoids the problem of local fluid stagnation or uneven flow rate, and ensures that the fluid is evenly distributed on the ion exchange membrane, thereby improving the electrolysis efficiency.

[0020] (3) This utility model tightly bonds carbon paper, titanium felt, porous membrane, and Nafion membrane, which reduces contact resistance, promotes efficient transfer of electrons and ions, and significantly improves the overall efficiency of electrolysis reaction.

[0021] (4) The present invention uses the stepped positioning groove on the frame assembly to accurately fix the ion exchange membrane, and sets the first sealing ring and the second sealing ring to ensure the sealing of the electrode, which avoids the displacement, wrinkling or damage of the ion exchange membrane during the electrolysis reaction, extends the service life of the ion exchange membrane and reduces the equipment maintenance cost; at the same time, the tight assembly of each component and the multiple sealing design ensure the overall sealing of the electrolytic cell, prevent fluid leakage and improve the operating stability of the equipment.

[0022] (5) The Nafion membrane used in this invention has excellent ion selectivity, which can effectively prevent the occurrence of side reactions and improve the purity of hydrogen peroxide products; the uniform mass transfer conditions and high reaction efficiency significantly increase the amount of hydrogen peroxide generated per unit time, and the product yield is increased by more than 30% compared with the traditional electrolysis method. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the three-dimensional structure of a hydrogen peroxide electrolysis cell;

[0024] Figure 2 This is a cross-sectional view of a hydrogen peroxide electrolysis cell;

[0025] Figure 3 This is a schematic diagram of the structure of an electrolytic electrode;

[0026] Figure 4 This is a schematic diagram of the distribution section.

[0027] Wherein: 10-Front end plate; 20-Front insulating plate; 30-Current collector; 40-Bipolar plate; 50-Second sealing ring; 60-Electrolytic electrode; 70-Rear insulating plate; 80-Rear end plate; 61-Carbon paper; 62-Frame assembly; 63-First sealing ring; 64-Porous membrane; 65-Nafion membrane; 66-Titanium felt; 62A-Annular sealing groove; 62B-Distribution section; 62C-Connecting groove. Detailed Implementation

[0028] Example 1:

[0029] This embodiment describes a sandwich-type hydrogen peroxide preparation electrolytic cell, such as... Figure 1 , Figure 2 As shown, the device includes a front panel and a rear panel that are joined together. Two sets of current collectors 30 are disposed between the front and rear panels. At least one set of electrolytic electrodes 60 is disposed between the two sets of current collectors 30. Bipolar plates 40 are disposed on both sides of each electrolytic electrode 60. Liquid channels and gas channels are respectively disposed on opposite sides of each bipolar plate 40. Distribution portions 62B are respectively disposed at the edges of both sides of each electrolytic electrode 60. One end of each distribution portion 62B is connected to either the gas channel or the liquid channel, and the other end of each distribution portion 62B leads to the center of the electrolytic electrode 60. A gas channel is disposed on one side of each bipolar plate 40, and a liquid channel is disposed on the other side of each bipolar plate 40. The gas channel and liquid channel are either serpentine channels or mesh channels.

[0030] The front and rear panels, serving as the outer shell of the electrolytic cell, provide support and sealing protection for the internal structural components after being assembled together, ensuring the normal operation of the hydrogen peroxide electrolysis reaction. The current collector 30 collects and transfers electrons during electrolysis, ensuring the efficiency of the hydrogen peroxide electrolysis process. At least one set of electrolytic electrodes 60 is disposed between the current collectors 30 on both sides. Figure 1As shown, two sets of electrolytic electrodes 60 are arranged between the current collectors 30 on both sides. The number of electrolytic electrodes 60 can be appropriately increased or decreased according to actual electrolysis requirements. A bipolar plate 40 is provided on both sides of each electrolytic electrode 60. One side of the bipolar plate 40 is a gas channel for air to flow in; the other side is a liquid channel for water to flow in. The gas channel of the first bipolar plate 40 is in contact with the cathode side of the electrolytic electrode 60, and the liquid channel of the second bipolar plate 40 is in contact with the anode side of the electrolytic electrode 60.

[0031] To ensure uniform distribution of air and water to the cathode and anode of the electrolysis electrode 60, distribution sections 62B are provided at the edges of both sides of the electrolysis electrode 60. One end of the distribution section 62B is connected to a gas channel or a liquid channel, and the other end leads to a diaphragm at the center of the electrolysis electrode 60. Air in the gas channel is guided and distributed by the distribution section 62B and flows uniformly to the cathode side of the electrolysis electrode 60, ensuring uniform distribution and sufficient contact between the air and the cathode side. Simultaneously, water in the liquid channel is guided and distributed by the distribution section 62B and flows uniformly to the anode side of the electrolysis electrode 60, ensuring uniform distribution and sufficient contact between the water and the anode side. This ultimately reduces contact resistance, promotes efficient electron and ion transfer, and significantly improves the overall efficiency of the electrolysis reaction. Meanwhile, a membrane is directly integrated at the center of the electrolytic electrode 60, which effectively prevents the membrane from shifting or displacing, thereby preventing the membrane from moving and breaking during the electrolytic reaction and improving the structural stability of the entire electrolytic cell.

[0032] Furthermore, a second sealing ring 50 is provided between the bipolar plate 40 and the electrolytic electrode 60, and the gas flow channel and liquid flow channel are located within the inner region of the second sealing ring 50. Distributing the gas flow channel and liquid flow channel on both sides of the bipolar plate 40 achieves gas-liquid separation, and the air introduced into the gas flow channel and the water introduced into the liquid flow channel are relatively safer raw materials. By providing the second sealing ring 50 between the bipolar plate 40 and the electrolytic electrode 60, the fluids inside the gas flow channel and liquid flow channel are effectively sealed, preventing fluid leakage and improving the stability and safety of the electrolytic cell operation.

[0033] Example 2:

[0034] This embodiment discloses a sandwich-type hydrogen peroxide preparation electrolyzer, which is an improvement on Embodiment 1, such as... Figure 2 and Figure 3As shown, the electrolytic electrode 60 includes carbon paper 61, a frame assembly 62, an ion exchange membrane assembly, and a titanium felt 66. The ion exchange membrane assembly is installed inside the frame assembly 62. The carbon paper 61 is installed on the side of the frame assembly 62 near the gas flow channel, and the titanium felt 66 is installed on the side of the frame assembly 62 near the liquid flow channel.

[0035] The frame assembly 62 includes two interlocking sub-frames. By fitting the two sub-frames together, the ion exchange membrane module is confined and fixed inside the frame assembly 62, effectively preventing movement of the ion exchange membrane module during electrolysis. Carbon paper 61 is disposed on the side of the frame assembly 62 near the gas flow channel, serving as the cathode material. Titanium felt 66 is disposed on the side of the frame assembly 62 near the liquid flow channel, serving as the anode material.

[0036] The carbon paper 61 and titanium felt 66 are both installed on both sides of the frame assembly 62 in an inlay manner. This ensures the stability of the carbon paper 61 and titanium felt 66, while also ensuring that the carbon paper 61 can make close contact with the ion exchange membrane module and the titanium felt 66 can make close contact with the ion exchange membrane module, thereby ensuring electrolysis efficiency.

[0037] The rest of this embodiment is the same as that of Embodiment 1, so it will not be described again.

[0038] Example 3:

[0039] This embodiment discloses a sandwich-type hydrogen peroxide preparation electrolyzer, which is an optimization based on Embodiment 1 or 2, such as... Figure 2 and Figure 3 As shown, the ion exchange membrane includes a porous membrane 64 and a Nafion membrane 65. The frame assembly 62 has a stepped positioning groove inside, and the porous membrane 64 and Nafion membrane 65 are installed inside the stepped positioning groove. The porous membrane 64 is positioned close to the carbon paper 61, and the Nafion membrane 65 is positioned close to the titanium felt 66.

[0040] The frame assembly 62 has a stepped positioning groove inside, the size and thickness of which correspond to the size and thickness of the ion exchange membrane. The ion exchange membrane is fitted inside the stepped positioning groove, thus fixing it in place and effectively preventing displacement under fluid disturbance, thereby extending its service life. The porous membrane 64 is tightly bonded to the Nafion membrane 65, which is used for ion exchange, selectively transferring ions and promoting the generation of hydrogen peroxide. The porous membrane 64 supports the Nafion membrane 65 and provides uniform liquid distribution. After the fluid enters through the distribution section 62B of the frame, it permeates evenly through the porous membrane 64 to the surface of the Nafion membrane 65. The hydrogen peroxide product generated after the reaction flows out from the other side with the fluid.

[0041] Furthermore, such as Figure 4 As shown, the frame assembly 62 has a membrane limiting area in the central region on the side near the ion exchange membrane, corresponding to the ion exchange membrane. An annular sealing groove 62A is arranged around the outside of the membrane limiting area, and a first sealing ring 63 is installed inside the annular sealing groove 62A. The distribution part 62B is arranged in the area between the membrane limiting area and the annular sealing groove 62A. One end of the distribution part 62B is connected to the gas flow channel or the liquid flow channel through the connecting groove 62C, and the other end of the distribution part 62B leads to the membrane limiting area.

[0042] The membrane limiting area is equipped with stepped positioning grooves to achieve stable and non-displacement-free positioning and fixation of the ion exchange membrane. The annular sealing groove 62A facilitates the positioning and installation of the first sealing ring 63, which seals the membrane limiting area within the annular sealing groove 62A, effectively preventing fluid leakage. The connecting groove 62C is an elongated, waist-shaped groove. After passing through the connecting groove 62C, the fluid enters the distribution section 62B, and then flows along the distribution section 62B, distributing evenly towards the membrane limiting area. This ensures uniform fluid distribution on the ion exchange membrane and guarantees sufficient contact between the fluid and the ion exchange membrane.

[0043] Furthermore, the distribution section 62B includes a distribution opening, inside which a plurality of diversion channels are evenly arranged. The distribution opening is funnel-shaped, which helps guide the fluid into the diversion channels. The plurality of evenly arranged diversion channels evenly distribute and guide the fluid to the ion exchange membrane, ensuring a uniform distribution of the fluid on the ion exchange membrane.

[0044] The rest of this embodiment is the same as that of embodiment 1 or 2, so it will not be described again.

[0045] Example 4:

[0046] This embodiment discloses a sandwich-type hydrogen peroxide preparation electrolyzer, which is optimized based on any one of Embodiments 1-3, such as... Figure 3 As shown, the frame assembly 62 has a carbon paper inlay groove on the side near the carbon paper 61, and the carbon paper 61 is inlaid inside the carbon paper inlay groove; the frame assembly 62 has a titanium felt inlay groove on the side near the titanium felt 66, and the titanium felt 66 is inlaid inside the titanium felt inlay groove.

[0047] The rest of this embodiment is the same as any one of embodiments 1-3, so it will not be described again.

[0048] Example 5:

[0049] This embodiment discloses a sandwich-type hydrogen peroxide preparation electrolyzer, which is optimized based on any one of embodiments 1-4, such as... Figure 1As shown, the front panel includes a front end plate 10 and a front insulating plate 20, with the front insulating plate 20 disposed between the front end plate 10 and the current collector plate 30. The rear panel includes a rear end plate 80 and a rear insulating plate 70, with the rear insulating plate 70 disposed between the rear end plate 80 and the current collector plate 30.

[0050] Both the front end plate 10 and the rear end plate 80 are equipped with gas inlets and liquid inlets, with the gas inlets communicating with the gas flow channel and the liquid inlets communicating with the liquid flow channel. A front insulating plate 20 is positioned between the front current collector 30 and the front end plate 10, and a rear insulating plate 70 is positioned between the rear current collector 30 and the rear end plate 80, serving as insulation and isolation. The current collector 30 is used to collect and conduct electrons generated during the electrolysis reaction. The front end plate 10 and the rear insulating plate 70, as the outer shell structure of the electrolytic cell, provide assembly support and sealing protection.

[0051] The rest of this embodiment is the same as any one of embodiments 1-4, so it will not be described again.

[0052] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A sandwich-type hydrogen peroxide preparation electrolytic cell, comprising a front panel and a rear panel joined together, characterized in that, Two sets of current collectors (30) are provided between the front panel and the rear panel, and at least one set of electrolytic electrodes (60) is provided between the two sets of current collectors (30). Bipolar plates (40) are provided on both sides of the electrolytic electrode (60), and liquid flow channels and gas flow channels are provided on the opposite two sides of the bipolar plates (40). Distribution parts (62B) are provided at the edges on both sides of the electrolytic electrode (60). One end of the distribution part (62B) is connected to the gas flow channel or the liquid flow channel, and the other end of the distribution part (62B) leads to the center of the electrolytic electrode (60).

2. The sandwich-type hydrogen peroxide preparation electrolytic cell according to claim 1, characterized in that, The electrolytic electrode (60) includes carbon paper (61), a frame assembly (62), an ion exchange membrane assembly, and a titanium felt (66). The ion exchange membrane assembly is installed inside the frame assembly (62). The carbon paper (61) is installed on the side of the frame assembly (62) near the gas flow channel, and the titanium felt (66) is installed on the side of the frame assembly (62) near the liquid flow channel.

3. The sandwich-type hydrogen peroxide preparation electrolytic cell according to claim 2, characterized in that, The ion exchange membrane includes a porous membrane (64) and a Nafion membrane (65). The frame assembly (62) has a stepped positioning groove inside, and the porous membrane (64) and Nafion membrane (65) are installed inside the stepped positioning groove. The porous membrane (64) is positioned close to the carbon paper (61), and the Nafion membrane (65) is positioned close to the titanium felt (66).

4. The sandwich-type hydrogen peroxide preparation electrolytic cell according to claim 3, characterized in that, The frame assembly (62) has a membrane limiting area in the central region of the side near the ion exchange membrane, corresponding to the ion exchange membrane. An annular sealing groove (62A) is provided around the outside of the membrane limiting area, and a first sealing ring (63) is installed inside the annular sealing groove (62A). The distribution part (62B) is located in the area between the membrane limiting area and the annular sealing groove (62A). One end of the distribution part (62B) is connected to the gas flow channel or the liquid flow channel through the connecting groove (62C), and the other end of the distribution part (62B) leads to the membrane limiting area.

5. A sandwich-type hydrogen peroxide preparation electrolytic cell according to claim 4, characterized in that, The distribution section (62B) includes a distribution opening, and a plurality of diversion grooves are evenly arranged inside the distribution opening.

6. A sandwich-type hydrogen peroxide preparation electrolytic cell according to claim 5, characterized in that, The frame assembly (62) has a carbon paper inlay groove on the side near the carbon paper (61), and carbon paper (61) is inlaid inside the carbon paper inlay groove; the frame assembly (62) has a titanium felt inlay groove on the side near the titanium felt (66), and titanium felt (66) is inlaid inside the titanium felt inlay groove.

7. A sandwich-type hydrogen peroxide preparation electrolyzer according to any one of claims 1-6, characterized in that, A gas flow channel is provided on one side of the bipolar plate (40), and a liquid flow channel is provided on the other side of the bipolar plate (40). The gas flow channel and the liquid flow channel are serpentine flow channels or mesh flow channels.

8. A sandwich-type hydrogen peroxide preparation electrolyzer according to any one of claims 1-6, characterized in that, A second sealing ring (50) is provided between the bipolar plate (40) and the electrolytic electrode (60), and the gas flow channel and liquid flow channel are located in the inner area of ​​the second sealing ring (50).

9. A sandwich-type hydrogen peroxide preparation electrolyzer according to any one of claims 1-6, characterized in that, The front panel includes a front panel (10) and a front insulating panel (20), wherein the front insulating panel (20) is disposed between the front panel (10) and the current collector (30).

10. A sandwich-type hydrogen peroxide preparation electrolyzer according to any one of claims 1-6, characterized in that, The rear panel includes a rear end plate (80) and a rear insulating plate (70), wherein the rear insulating plate (70) is disposed between the rear end plate (80) and the current collector plate (30).

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