Switchable mode multifunctional electrochemical synthesis of hydrogen peroxide cell

Abstract

The application discloses a switchable mode multifunctional electric synthesis hydrogen peroxide electric pile, which comprises an anode end plate, an anode current collecting plate, a modular electrolytic unit group, a cathode current collecting plate and a cathode end plate which are sequentially connected; the modular electrolytic unit group comprises a plurality of modular electrolytic units which are stacked; one of the two modular electrolytic units at two ends is connected with the anode current collecting plate, and the other is connected with the cathode current collecting plate; the anode current collecting plate is connected with an anode terminal post; the cathode current collecting plate is connected with a cathode terminal post; wherein, the anode end plate, the anode current collecting plate, the modular electrolytic unit, the cathode current collecting plate and the cathode end plate are all provided with a plurality of feeding ports and a plurality of discharging ports. In the application, the modular electrolytic unit can be switched in a pure hydrogen peroxide system, a neutral non-pure hydrogen peroxide system and an alkaline system, three different working modes are synthesized, the versatility and flexibility of the equipment are improved, and the cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrochemical synthesis, in particular to a stack device for electrochemical synthesis of hydrogen peroxide (H2O2), and more particularly to a stack capable of switching between different working modes (neutral, alkaline, pure hydrogen peroxide synthesis) by replacing part of the modular components. BACKGROUND

[0002] Hydrogen peroxide (H2O2) is an important green oxidant and is widely used in chemical industry, environmental protection, medical treatment, electronics and other fields. Electrochemical synthesis method has become an important way to prepare hydrogen peroxide due to its environmental friendliness, mild operating conditions, on-site production and other advantages. At present, most of the electrolytic cells for electrochemical synthesis of hydrogen peroxide are mainly intermittent single-tank structures based on laboratory research. The electrolytic cell structure is not compact enough, the system ohmic impedance is relatively high, and it is also difficult to realize large-scale series integration. In addition, due to the different requirements of different application scenarios for the purity, pH and electrolyte of hydrogen peroxide, different stack designs are needed. A few existing stacks are mainly for single reaction systems (such as neutral system, alkaline system or system pursuing high-purity product), and different special stacks need to be designed and manufactured to meet different needs, resulting in high research and production costs, low equipment utilization, inconvenience in switching application scenarios, and difficulty in achieving one machine for multiple uses. SUMMARY

[0003] In order to solve the above problems, the present application provides a stackable multifunctional electrochemical synthesis hydrogen peroxide stack with switchable modes. Through modular design, only a single component needs to be replaced, and the same stack basic platform can adapt to three different working modes of neutral, alkaline or pure hydrogen peroxide synthesis, significantly improving the versatility and flexibility of the equipment and reducing the use cost.

[0004] The present application provides a multifunctional electrochemical synthesis hydrogen peroxide stack with switchable modes, which adopts the following technical scheme:

[0005] A multifunctional electrochemical synthesis hydrogen peroxide stack with switchable modes comprises an anode end plate, an anode bus bar, a modular electrolytic unit group, a cathode bus bar and a cathode end plate connected in sequence, and is fastened to form a whole through a connecting piece;

[0006] The modular electrolytic unit group comprises a plurality of modular electrolytic units stacked; one of the two modular electrolytic units at both ends is connected with the anode bus bar, and the other is connected with the cathode bus bar;

[0007] The anode bus bar is connected with an anode terminal post to connect the positive pole of the power supply; the cathode bus bar is connected with a cathode terminal post to connect the negative pole of the power supply;

[0008] The anode end plate, the anode current collector plate, the modular electrolysis unit, the cathode current collector plate and the cathode end plate are all provided with a plurality of feeding ports and a plurality of discharging ports; the modular electrolysis unit realizes switching in any of a pure hydrogen peroxide system, a neutral non-pure hydrogen peroxide system and an alkaline system by selecting an electrolyte.

[0009] Further, the modular electrolysis unit comprises an anode flow channel plate, an electrolyte cavity plate, a cathode flow channel plate, an ion exchange membrane, a bipolar plate and a gasket connected in sequence; the anode flow channel plate is connected with an anode; a cathode is arranged between the cathode flow channel plate and the bipolar plate; the anode flow channel plate and the cathode flow channel plate are both provided with a rectifying structure to evenly distribute the flow field.

[0010] Further, the anode current collector plate and the bipolar plate are both plated with a layer of noble metal coating.

[0011] Further, anion and cation separation membranes are arranged between the anode flow channel plate and the cathode flow channel plate; a cation membrane is arranged between the anode flow channel plate and the anode; and an anion membrane is arranged between the cathode flow channel plate and the cathode.

[0012] Further, the anode end plate, the anode current collector plate, the modular electrolysis unit, the cathode current collector plate and the cathode end plate are all provided with three feeding ports and three discharging ports; the three feeding ports and the three discharging ports are arranged in one-to-one correspondence, and the feeding ports and the discharging ports are arranged at two ends of the length direction of the multifunctional hydrogen peroxide synthesis hydrogen peroxide electric pile respectively;

[0013] The feeding port communicating with the feeding channel of the anode is set as a first feeding port, and the discharging port communicating with the discharging channel of the anode is set as a first discharging port; the feeding port communicating with the feeding channel of the cathode is set as a second feeding port, and the discharging port communicating with the discharging channel of the cathode is set as a second discharging port; the feeding port communicating with the feeding channel of the electrolyte cavity is set as a third feeding port, and the discharging port communicating with the discharging channel of the electrolyte cavity is set as a third discharging port.

[0014] Further, the anode flow channel plate is provided with an anode cavity; the anode cavity communicates with the first feeding port and the first discharging port through a first rectifying area respectively; and the inlet area of the first feeding port is larger than the outlet area of the first discharging port.

[0015] Further, the electrolyte cavity plate is provided with an electrolyte cavity; the electrolyte cavity communicates with the second feeding port and the second discharging port through a second rectifying area respectively; and the inlet area of the second feeding port is larger than the outlet area of the second discharging port.

[0016] Further, the bipolar plate is provided with a vertical flow channel near the cathode side; the vertical flow channel is in communication with the third feeding port and the third discharging port through the third rectifying area; the inlet area of the third feeding port is larger than the outlet area of the third discharging port.

[0017] Further, the cathode end plate is provided with a first feeding external interface, a second feeding external interface, a third feeding external interface, a first discharging external interface, a second discharging external interface and a third discharging external interface; the first feeding external interface is in communication with the first feeding port to form a first feeding total channel, the second feeding external interface is in communication with the second feeding port to form a second feeding total channel, and the third feeding external interface is in communication with the third feeding port to form a third feeding total channel; the first discharging external interface is in communication with the first discharging port to form a first discharging total channel, the second discharging external interface is in communication with the second discharging port to form a second discharging total channel, and the third discharging external interface is in communication with the third discharging port to form a third discharging total channel.

[0018] Further, the anode cavity on the anode flow channel plate is in communication with the first feeding total channel and the first discharging total channel, so that the anode cavity of each anode flow channel plate becomes a branch flow channel of the first feeding total channel and the first discharging total channel;

[0019] The electrolyte cavity on the electrolyte cavity plate is in communication with the second feeding total channel and the second discharging total channel, so that the electrolyte cavity of each electrolyte cavity plate becomes a branch flow channel of the second feeding total channel and the second discharging total channel;

[0020] The vertical flow channel on the bipolar plate near the cathode side is in communication with the third feeding total channel and the third discharging total channel, so that the vertical flow channel of each bipolar plate becomes a branch flow channel of the third feeding total channel and the third discharging total channel.

[0021] Beneficial effects:

[0022] The multifunctional hydrogen peroxide synthesis electric pile provided by the application can adapt to three different working modes of neutral, alkaline or pure hydrogen peroxide synthesis by only replacing the conductive plate and flow channel plate assembly on the anode side, significantly improves the versatility and flexibility of the equipment, and reduces the use cost. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The structure explosion diagram of the multifunctional hydrogen peroxide synthesis electric pile provided by the application;

[0024] Figure 2A pure hydrogen peroxide system modular electrolytic unit for the present invention;

[0025] Figure 3 A first feed and discharge schematic for the neutral system of Example 2;

[0026] Figure 4 A second feed and discharge schematic for the neutral system of Example 2;

[0027] Figure 5 A third feed and discharge schematic for the neutral system of Example 2;

[0028] Figure 6 A neutral hydrogen peroxide system modular electrolytic unit for Example 3;

[0029] Figure 7 A basic hydrogen peroxide system modular electrolytic unit for Example 4;

[0030] Figure 8 A pure hydrogen peroxide system electro-synthesis hydrogen peroxide production and pH graph for Example 2;

[0031] Figure 9 A neutral hydrogen peroxide system electro-synthesis hydrogen peroxide production and pH graph for Example 3;

[0032] Figure 10 A basic hydrogen peroxide system electro-synthesis hydrogen peroxide production and pH graph for Example 4;

[0033] Wherein, 1, anode end plate; 2, anode busbar; 3, modular electrolytic unit; 4, cathode busbar; 5, cathode end plate; 31, anode; 32, cation membrane; 33, anode flow channel plate; 34, electrolyte cavity plate; 35, cathode flow channel plate; 36, anion membrane; 37, cathode; 38, bipolar plate; 512, first feed total channel; 513, first rectification zone; 514, first discharge total channel; 522, second feed total channel; 523, second rectification zone; 524, second discharge total channel; 532, third feed total channel; 533, third rectification zone; 534, third discharge total channel. DETAILED DESCRIPTION

[0034] The above description is only a summary of the technical solutions of the present application, in order to more clearly understand the technical means of the present application, the contents of the specification can be implemented, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described.

[0035] Example 1

[0036] Reference Figures 1 to 2A switchable mode multifunctional electric synthesis hydrogen peroxide electric pile comprises an anode end plate 1, an anode current collector plate 2, a modular electrolytic unit group, a cathode current collector plate 4 and a cathode end plate 5 connected in sequence and fastened to form a whole through connecting pieces.

[0037] Preferably, the connecting pieces are bolts, and the anode end plate 1, the anode current collector plate 2, the modular electrolytic unit group, the cathode current collector plate 4 and the cathode end plate 5 are fastened to form a whole through the bolts.

[0038] The modular electrolytic unit group comprises a plurality of stacked modular electrolytic units 3, wherein one of the two modular electrolytic units 3 at both ends is connected with the anode current collector plate 2, and the other is connected with the cathode current collector plate 4.

[0039] The anode current collector plate 2 is connected with an anode terminal post to connect the positive pole of the power supply, and the cathode current collector plate 4 is connected with a cathode terminal post to connect the negative pole of the power supply.

[0040] Preferably, the anode end plate 1, the anode current collector plate 2, the modular electrolytic unit 3, the cathode current collector plate 4 and the cathode end plate 5 are provided with a plurality of feeding ports and a plurality of discharging ports; and the modular electrolytic unit 3 can realize switching among a pure hydrogen peroxide system, a neutral non-pure hydrogen peroxide system and an alkaline system by selecting an electrolyte.

[0041] In the embodiment, the modular electrolytic unit 3 comprises an anode flow channel plate 33, an electrolyte cavity plate 34, a cathode flow channel plate 35, an ion exchange membrane and a bipolar plate 38 and a gasket connected in sequence; the anode flow channel plate 33 is connected with the anode 31; the cathode 37 is arranged between the cathode flow channel plate 35 and the bipolar plate 38; and the anode flow channel plate 33 and the cathode flow channel plate 35 are both provided with rectifier structures to evenly distribute the flow field.

[0042] Preferably, the anode flow channel plate 33 and the cathode flow channel plate 35 are made of acrylic, PEEK (a kind of high-performance special engineering plastic) or the like, and more preferably PEEK.

[0043] In the embodiment, the surfaces of the anode current collector plate 2 and the bipolar plate 38 are both plated with a layer of noble metal coating.

[0044] Preferably, the anode current collector plate 2 and the bipolar plate 38 are both made of titanium plates plated with a noble metal coating, and the noble metal coating is a coating of platinum, palladium, ruthenium, iridium, tantalum or the like, and more preferably platinum is used as the noble metal coating of the anode current collector plate 2 and the bipolar plate 38.

[0045] Preferably, the anode current collector plate 2 is made of a titanium plate plated with platinum.

[0046] The material of the cathode current collector plate 4 is ordinary carbon, titanium, titanium with a noble metal coating (platinum, palladium, iridium, tantalum), nickel, or graphite, and in this embodiment, graphite is preferably used as the cathode current collector plate 4.

[0047] An anion separator and a cation separator are arranged between the anode flow channel plate 33 and the cathode flow channel plate 35; a cation membrane 32 is arranged between the anode flow channel plate 33 and the anode 31; and an anion membrane 36 is arranged between the cathode flow channel plate 35 and the cathode 37.

[0048] The anion separator and the cation separator between the anode flow channel plate 33 and the cathode flow channel plate 35 can be arranged according to specific requirements.

[0049] In this embodiment, three feed inlets and three discharge outlets are arranged on the anode end plate 1, the anode current collector plate 2, the modular electrolysis unit 3, the cathode current collector plate 4, and the cathode end plate 5; the three feed inlets and the three discharge outlets are arranged one-to-one in correspondence, and the feed inlets and the discharge outlets are arranged at both ends of the length direction of the multifunctional electric synthesis hydrogen peroxide electric pile.

[0050] The feed inlet connected to the feed channel on the anode 31 is set as the first feed inlet, and the discharge outlet connected to the discharge channel on the anode 31 is set as the first discharge outlet; the feed inlet connected to the feed channel of the electrolyte cavity is set as the second feed inlet, and the discharge outlet connected to the discharge channel of the electrolyte cavity is set as the second discharge outlet; the feed inlet connected to the feed channel on the cathode 37 is set as the third feed inlet, and the discharge outlet connected to the discharge channel on the cathode 37 is set as the third discharge outlet.

[0051] In this embodiment, the anode 31 cavity is arranged on the anode flow channel plate 33; the anode 31 cavity is connected to the first feed inlet and the first discharge outlet through the first rectifier area 513; and the inlet area of the first feed inlet is larger than the outlet area of the first discharge outlet.

[0052] In this embodiment, the electrolyte cavity is arranged on the electrolyte cavity plate 34; the electrolyte cavity is connected to the second feed inlet and the second discharge outlet through the second rectifier area 523; and the inlet area of the second feed inlet is larger than the outlet area of the second discharge outlet.

[0053] In this embodiment, the vertical flow channel is arranged on the bipolar plate 38 close to the cathode 37 side; the vertical flow channel is connected to the third feed inlet and the third discharge outlet through the third rectifier area 533; and the inlet area of the third feed inlet is larger than the outlet area of the third discharge outlet.

[0054] In the embodiment, the cathode end plate 5 is provided with a first feeding external interface, a second feeding external interface, a third feeding external interface, a first discharging external interface, a second discharging external interface and a third discharging external interface; the first feeding external interface is in communication with the first feeding port to form the first feeding total channel 512, the second feeding external interface is in communication with the second feeding port to form the second feeding total channel 522, and the third feeding external interface is in communication with the third feeding port to form the third feeding total channel 532; the first discharging external interface is in communication with the first discharging port to form the first discharging total channel 514, the second discharging external interface is in communication with the second discharging port to form the second discharging total channel 524, and the third discharging external interface is in communication with the third discharging port to form the third discharging total channel 534.

[0055] In the embodiment, the anode 31 cavity provided on the anode flow channel plate 33 is in communication with the first feeding total channel 512 and the first discharging total channel 514 respectively, so that the anode 31 cavity of each anode flow channel plate 33 becomes a branch flow channel of the first feeding total channel 512 and the first discharging total channel 514;

[0056] The electrolyte cavity provided on the electrolyte cavity plate 34 is in communication with the second feeding total channel 522 and the second discharging total channel 524 respectively, so that the electrolyte cavity of each electrolyte cavity plate 34 becomes a branch flow channel of the second feeding total channel 522 and the second discharging total channel 524;

[0057] The vertical flow channel provided on the bipolar plate 38 close to the cathode 37 side is in communication with the third feeding total channel 532 and the discharging total channel respectively, so that the vertical flow channel of each bipolar plate 38 becomes a branch flow channel of the third feeding total channel 532 and the third discharging total channel 534.

[0058] Embodiment 2

[0059] Referring to Figure 8 , the embodiment is a further setting based on embodiment 1, wherein the switchable mode multifunctional electric synthesis hydrogen peroxide stack in the embodiment is switched to a pure hydrogen peroxide system.

[0060] Pure hydrogen peroxide system:

[0061] The pure hydrogen peroxide system structure comprises an anode end plate 1, an anode current collector plate 2, a pure hydrogen peroxide system modular electrolysis unit group, a cathode current collector plate 4 and a cathode end plate 5 which are sequentially stacked and connected;

[0062] The pure hydrogen peroxide system modular electrolysis unit group comprises a plurality of pure hydrogen peroxide system modular electrolysis units, among which, one pure hydrogen peroxide system modular electrolysis unit is connected with the anode current collector plate 2, and the other pure hydrogen peroxide system modular electrolysis unit is connected with the cathode current collector plate 4;

[0063] The modular electrolytic unit of pure hydrogen peroxide system comprises, in sequence, an anode flow channel plate 33, an electrolyte cavity, a cathode flow channel plate 35, a bipolar plate 38 and a gasket.

[0064] In use, the anode 31 is placed in the anode flow channel plate 33; the electrolyte cavity is filled with solid electrolyte; and the cathode 37 is placed in the cathode flow channel plate 35. The anode 31 and the anode flow channel plate 33 are sandwiched by a cation membrane 32, and the electrolyte cavity is sandwiched by an anion membrane 36 between the cathode 37 and the cathode flow channel plate 35.

[0065] The anode 31 uses a titanium felt coated with a metal (e.g. platinum, palladium, ruthenium, iridium, tantalum, etc.) coating (preferably iridium metal coating), and the cathode 37 uses a porous electrode with a carbon-based catalyst coating; the porous electrode can be selected from titanium foam, nickel foam, graphite felt, etc., and graphite felt is preferred;

[0066] Pure water enters the stack from the first feed external interface of the cathode end plate 5, passes through the first feed total channel 512, respectively passes through the first rectifier area 513 of the anode flow channel plate 33 of each modular electrolytic unit 3, enters the anode flow channel and reacts with the anode 31, and finally converges in the first discharge total channel 514 and leaves the stack from the first discharge external interface, as shown in Figure 3 .

[0067] Pure water enters the stack from the second feed external interface of the cathode end plate 5, passes through the second feed total channel 522, respectively passes through the second rectifier area 523 of the electrolyte cavity plate 34 of each modular electrolytic unit, enters the electrolyte cavity and mixes with the hydrogen peroxide generated by the reaction in the cavity, and finally converges in the second discharge total channel 524 and leaves the stack from the second discharge external interface to obtain pure hydrogen peroxide, as shown in Figure 4 .

[0068] The cathode 37 is fed with oxygen or air, preferably oxygen. Oxygen enters the stack from the third feed external interface of the cathode end plate 5, passes through the third feed total channel 532, respectively passes through the third rectifier area 533 of the bipolar plate 38 of each modular electrolytic unit, enters the vertical flow channel of the bipolar plate 38, and finally converges in the third discharge total channel 534 and leaves the stack from the third discharge external interface. At the same time, the oxygen entering the vertical flow channel enters the cathode flow channel plate 35 and reaches the surface of the cathode 37 to participate in the reaction, as shown in Figure 5 .

[0069] Example 3

[0070] Referring to Figure 9The embodiment is based on the embodiment 2, wherein the switchable mode multifunctional electric synthesis hydrogen peroxide stack in the embodiment is switched to a neutral hydrogen peroxide system, the difference is that the first external inlet and outlet of the cathode end plate 5 is plugged with a plug, and the anion membrane and the solid electrolyte are no longer needed, the cathode and anode 31 are completely consistent with the neutral hydrogen peroxide system, and the neutral modular electrolytic unit 3 is as shown in Figure 6 .

[0071] The neutral hydrogen peroxide system is as shown in

[0072] In use, the anode 31 is placed in the anode flow channel plate 33, and the cathode 37 is placed in the cathode flow channel plate 35. The neutral electrolyte enters the stack from the second inlet external interface of the cathode end plate 5, passes through the second inlet total channel 522, respectively passes through the second rectifier area 523 of each modular electrolytic unit electrolyte cavity plate 34, enters the electrolyte cavity, reacts to generate hydrogen peroxide in the cavity, and finally converges in the second outlet total channel 524 and leaves the stack from the second outlet external interface to obtain neutral hydrogen peroxide.

[0073] The cathode 37 is fed with oxygen or air, preferably oxygen. Oxygen enters the stack from the third inlet external interface of the cathode end plate 5, passes through the third inlet total channel, respectively passes through the third rectifier area 533 of each modular electrolytic unit bipolar plate 38, enters the vertical flow channel of the bipolar plate 38, and finally converges in the third outlet total channel and leaves the stack from the third outlet external interface. At the same time, the oxygen entering the vertical flow channel will enter the cathode flow channel plate 35 and reach the surface of the cathode 37 to participate in the reaction.

[0074] Embodiment 4

[0075] Referring to Figure 10 The embodiment is based on the embodiment 3, wherein the switchable mode multifunctional electric synthesis hydrogen peroxide stack in the embodiment is switched to an alkaline hydrogen peroxide system, the difference is that the anion membrane 36 and the cathode flow channel plate 35 are no longer needed, and the third outlet external interface is plugged with a plug, as shown in Figure 7 .

[0076] The alkaline hydrogen peroxide system is as shown in

[0077] In use, the anode 31 is placed in the anode flow channel plate 33, and the cathode 37 is placed in the electrolyte cavity plate 34. The anode 31 and the anode flow channel plate 33 and the cathode 37 and the cathode flow channel plate 35 are sandwiched with a cation membrane.

[0078] The anode 31 uses foamed nickel, and the cathode 37 uses a porous electrode with a carbon-based catalyst coating (optionally foamed titanium, foamed nickel, graphite felt, etc., preferably graphite felt).

[0079] The anode 31 liquid enters the stack from the first feed outer interface of the cathode end plate 5, passes through the first feed total channel 512, respectively passes through the first rectification area 513 of the anode flow channel plate 33 of each modular electrolytic unit, enters the anode flow channel and reacts with the anode 31, and finally converges in the first discharge total channel 514 and leaves the stack from the first discharge outer interface.

[0080] The pure water and oxygen are pre-mixed outside the stack, and then enter the stack together from the second feed outer interface, pass through the second feed total channel 522, respectively pass through the second rectification area 523 of the electrolyte cavity plate 34 of each modular electrolytic unit, enter the electrolyte cavity to contact the cathode 37 to generate hydrogen peroxide by two-electron reaction, and finally converge in the second discharge total channel 524 and leave the stack from the second discharge outer interface to obtain alkaline hydrogen peroxide.

[0081] In addition, the oxygen enters the stack from the third feed outer interface of the cathode end plate 5, passes through the third feed total channel, respectively passes through the third rectification area 533 of the bipolar plate 38 of each modular electrolytic unit, enters the vertical flow channel of the bipolar plate 38, and the oxygen entering the vertical flow channel enters the cathode flow channel plate 35 to reach the surface of the cathode 37 to participate in the reaction, and finally converges with the gas-liquid mixture in the electrolyte cavity in the third discharge total channel and leaves the stack from the third discharge outer interface.

[0082] Example 5

[0083] In this embodiment, the electro-synthetic hydrogen peroxide stack of Example 2 is used to carry out pure hydrogen peroxide production test, and the operating condition of fixed cross-flow 10 A is adopted, and the current density of the reactor is calculated to be 100 mA / cm 2 .

[0084] The pure water enters the reaction stack from the first feed outer interface at a flow rate of 600 ml / min.

[0085] The pure water enters the stack from the second feed outer interface at a flow rate of 200 ml / min.

[0086] The air first passes through the pure water, and then enters the reaction stack from the third feed outer interface at a flow rate of 5 l / min. The production is carried out in the form of over-flow circulation electrolysis, the concentration is measured once every hour, and the electrolyte is replaced once every hour.

[0087] Example 6

[0088] In this embodiment, the electro-synthetic hydrogen peroxide stack of Example 3 is used to carry out neutral hydrogen peroxide production test, and the operating condition of fixed cross-flow 10 A is adopted, and the current density of the reactor is calculated to be 100 mA / cm 2 .

[0089] Neutral electrolyte (sodium sulphate) enters the reaction stack from the second feed external connection at a flow rate of 1000 ml / min.

[0090] Air enters the reaction stack from the third feed external connection at a flow rate of 3 1 / min. Production is carried out in the form of overflow circulation electrolysis, the concentration is measured every hour and the electrolyte is replaced.

[0091] Example 7

[0092] This example uses the switched to alkaline system stack of example 4 for production tests, this implementation uses the operating conditions of fixed cross flow 10 A, the current density of the reactor is calculated, the result is 100 mA / cm 2 .

[0093] NaOH solution enters the reaction stack from the first feed external connection at a flow rate of 600 ml / min.

[0094] Air and pure water are first pre-mixed, air enters the stack from the second feed external connection at a flow rate of 3 1 / min and pure water at a flow rate of 600 ml / min. Air enters the reaction stack from the third feed external connection at a flow rate of 3 1 / min. Production is carried out in the form of overflow circulation electrolysis, the concentration is measured every hour and the electrolyte is replaced.

[0095] The above description is only the preferred embodiment of the present application, and does not limit the technical scope of the present application in any way. Any slight modification, equivalent change and modification made according to the technical essence of the present application to the above embodiments still falls within the scope of the technical solution of the present application.

Claims

1. A switchable mode, multi-functional electro-synthetic hydrogen peroxide stack, characterized in that, The multifunctional hydrogen peroxide synthesis electrolytic stack comprises an anode end plate, an anode busbar, a modular electrolytic unit group, a cathode busbar and a cathode end plate connected in sequence and fastened to form a whole through a connecting piece; The modular electrolytic unit group comprises a plurality of modular electrolytic units arranged in stacks; among the two modular electrolytic units at both ends, one is connected with the anode busbar and the other is connected with the cathode busbar; The anode busbar is connected with an anode terminal to connect the positive pole of the power supply; the cathode busbar is connected with a cathode terminal to connect the negative pole of the power supply; The modular electrolytic unit can be switched among a pure hydrogen peroxide system, a neutral non-pure hydrogen peroxide system and an alkaline system by selecting an electrolyte; The modular electrolytic unit comprises an anode flow channel plate, an electrolyte cavity plate, a cathode flow channel plate, an ion exchange membrane, a bipolar plate and a gasket connected in sequence; the anode flow channel plate is connected with an anode; a cathode is arranged between the cathode flow channel plate and the bipolar plate; the anode flow channel plate and the cathode flow channel plate are both provided with rectifying structures to evenly distribute the flow field; The anode end plate, the anode busbar, the modular electrolytic unit, the cathode busbar and the cathode end plate are all provided with three inlet ports and three outlet ports; the three inlet ports and the three outlet ports are arranged one-to-one in correspondence, and the inlet ports and the outlet ports are arranged at both ends of the length direction of the multifunctional hydrogen peroxide synthesis electrolytic stack; The inlet port connected with the anode upper inlet channel is set as the first inlet port, and the outlet port connected with the anode upper outlet channel is set as the first outlet port; the inlet port connected with the electrolyte cavity inlet channel is set as the second inlet port, and the outlet port connected with the electrolyte cavity outlet channel is set as the second outlet port; the inlet port connected with the cathode upper inlet channel is set as the third inlet port, and the outlet port connected with the cathode upper outlet channel is set as the third outlet port.

2. The switchable mode multi-functional electro-synthetic hydrogen peroxide electrochemical cell of claim 1, wherein, The anode busbar and the bipolar plate are both plated with a layer of noble metal coating.

3. The switchable mode, multifunctional electro-synthetic hydrogen peroxide electrochemical cell of claim 1, wherein, An anion separator and a cation separator are arranged between the anode flow channel plate and the cathode flow channel plate; a cation membrane is arranged between the anode flow channel plate and the anode; and an anion membrane is arranged between the cathode flow channel plate and the cathode.

4. The switchable mode, multifunctional electro-synthetic hydrogen peroxide electrochemical cell of claim 1, wherein, The anode flow channel plate is provided with an anode cavity; the anode cavity is connected with the first inlet port and the first outlet port through a first rectifying area; and the inlet area of the first inlet port is larger than the outlet area of the first outlet port.

5. The switchable mode, multifunctional electro-synthetic hydrogen peroxide electrochemical cell of claim 1, wherein, The electrolyte cavity plate is provided with an electrolyte cavity; the electrolyte cavity is connected with the second inlet port and the second outlet port through a second rectifying area; and the inlet area of the second inlet port is larger than the outlet area of the second outlet port.

6. The switchable mode, multifunctional electro-synthetic hydrogen peroxide electrochemical cell of claim 1, wherein, The bipolar plate is provided with a vertical flow channel near the cathode side; the vertical flow channel is connected with the third inlet port and the third outlet port through a third rectifying area; and the inlet area of the third inlet port is larger than the outlet area of the third outlet port.

7. The switchable mode, multifunctional electro-synthetic hydrogen peroxide electrochemical cell of claim 1, wherein, The cathode end plate is provided with a first feeding outer interface, a second feeding outer interface, a third feeding outer interface, a first discharging outer interface, a second discharging outer interface and a third discharging outer interface; the first feeding outer interface is communicated with the first feeding port to form a first feeding total channel, the second feeding outer interface is communicated with the second feeding port to form a second feeding total channel, and the third feeding outer interface is communicated with the third feeding port to form a third feeding total channel; The first discharging outer interface is communicated with the first discharging port to form a first discharging total channel, the second discharging outer interface is communicated with the second discharging port to form a second discharging total channel, and the third discharging outer interface is communicated with the third discharging port to form a third discharging total channel.

8. The switchable mode, multifunctional electro-synthetic hydrogen peroxide electrochemical cell of claim 7, wherein, The anode cavity provided on the anode flow channel plate is respectively communicated with the first feeding total channel and the first discharging total channel, so that the anode cavity of each anode flow channel plate becomes a branch flow channel of the first feeding total channel and the first discharging total channel; The electrolyte cavity provided on the electrolyte cavity plate is respectively communicated with the second feeding total channel and the second discharging total channel, so that the electrolyte cavity of each electrolyte cavity plate becomes a branch flow channel of the second feeding total channel and the second discharging total channel; The vertical flow channel provided on the bipolar plate close to the cathode side is respectively communicated with the third feeding total channel and the discharging total channel, so that the vertical flow channel of each bipolar plate becomes a branch flow channel of the third feeding total channel and the third discharging total channel.

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