Bionic blade flow electrolytic tank device for producing peroxyacetic acid through efficient electro-catalysis

Abstract

The utility model discloses a bionic blade flow electrolytic tank device for producing peroxyacetic acid through efficient electro-catalysis, which comprises a cathode assembly, an anode assembly and a proton exchange membrane, the cathode assembly comprises a plurality of stacked module plates, and the module plates are respectively a cathode liquid cavity plate, a hollow baffle plate and a cathode gas cavity plate from inside to outside in sequence; a cathode gas diffusion electrode is arranged between the cathode liquid cavity plate and the hollow baffle plate, a module plate of the anode assembly is an anode liquid cavity plate, a proton exchange membrane is arranged between the anode liquid cavity plate and the cathode liquid cavity plate, and an anode electrode is arranged between the proton exchange membrane and the anode liquid cavity plate; and cavities with bionic blade structures are formed in the centers of the cathode liquid cavity plate and the anode liquid cavity plate. The negative electrode liquid cavity plate, the positive electrode liquid cavity plate and the negative electrode gas cavity plate adopt cavities with bionic blades, so that turbulent flow dead zones are reduced, and mass transfer is enhanced; and the cathode is a gas diffusion electrode, is arranged between the cathode liquid cavity plate and the hollow baffle plate and is used for enabling gas to participate in reaction, so that the output of peracetic acid is realized.

Description

Technical Field

[0001] The utility model relates to a bionic blade flow electrolytic cell device for producing peracetic acid by high-efficiency electrocatalysis. Background Art

[0002] Peracetic acid is a green and efficient peroxide oxidant. As a multifunctional chemical, it has a wide range of industrial applications, such as pulp bleaching, environmental disinfection and chemical synthesis. The industrial preparation method mainly uses hydrogen peroxide and acetic acid under the catalytic action of sulfuric acid. The large amount of waste acid and high cost produced are not in line with the concept of green sustainable development, and there are storage and transportation risks. The synthesis of peracetic acid using hydrogen peroxide generated in situ by electrochemical oxygen reduction is a feasible solution. This process avoids the high concentration of hydrogen peroxide generated by the pre-industrial anthraquinone method; in addition, the electricity required for electrochemical synthesis comes more from affordable renewable energy sources such as solar and wind power.

[0003] Currently, there are few reports on the electrocatalytic production of peracetic acid. There is an urgent need for a device for large-scale synthesis of peracetic acid by electrocatalysis to improve some of the disadvantages of traditional industrial synthesis and realize the green and economical synthesis of peracetic acid. Summary of the invention

[0004] In view of the problems existing in the prior art, the purpose of the utility model is to provide a bionic blade flow electrolytic cell device for efficiently electrocatalyzing the production of peracetic acid, which has the characteristics of simple structure, easy operation, enhanced mass transfer and efficient synthesis of peracetic acid.

[0005] The technical solutions adopted in this application are as follows:

[0006] A bionic blade flow electrolytic cell device for efficient electrocatalytic production of peracetic acid, comprising a plurality of modules stacked in sequence, which are, from left to right, a cathode gas chamber plate, a hollow baffle plate, a cathode liquid chamber plate, a proton exchange membrane and an anode liquid chamber plate, and a fluororubber gasket is clamped between two adjacent module plates for sealing, a hollow space is provided in the center of the fluororubber gasket to facilitate mass transfer of fluid between two modules on both sides thereof, a cathode gas diffusion electrode is provided between the side of the cathode gas chamber plate facing the hollow baffle plate and the adjacent fluororubber gasket, and the gas entering the cathode gas chamber plate penetrates into the cathode gas diffusion electrode through the hollow baffle plate to participate in the reaction;

[0007] An anode electrode is provided between the side of the anode liquid chamber facing the proton exchange membrane and the adjacent fluororubber gasket. The anode electrode and the cathode gas diffusion electrode are both extended to the outside by connecting a Pt sheet or a Cu sheet and connected to a power source.

[0008] Among them, the centers of the cathode liquid cavity plate and the anode liquid cavity plate are both provided with cavities with bionic blade structures, and the bionic blade structures of the two cavities are arranged symmetrically in space, and inlets and outlets communicating with the cavities are respectively arranged on their opposite sides.

[0009] Furthermore, the outlet of the cathode liquid cavity plate is connected to the inlet of the cathode liquid cavity plate through a circulation pump 1 and a cathode liquid storage tank by a pipeline, thereby forming a circulation loop of the cathode liquid.

[0010] Furthermore, a cavity with a bionic blade structure is provided at the center of the cathode gas chamber plate, and an air inlet and an air outlet communicating with the central cavity are respectively provided on opposite sides of the cathode gas chamber plate, the air inlet is connected to the oxygen cylinder, and the air outlet is connected to the cathode liquid storage tank by a pipeline, so that the outlet gas of the cathode gas chamber plate is connected to the cathode liquid storage tank, thereby realizing the reuse of the gas that has not contacted the electrode surface and increasing the oxygen content of the cathode electrolyte.

[0011] Furthermore, the outlet of the anode liquid cavity plate is connected to the inlet of the anode liquid cavity plate by a pipeline through a circulation pump 2 and an anode liquid storage tank, forming a circulation loop of the anode liquid; wherein the outlet of the anode liquid cavity plate and the inlet of the cathode liquid cavity plate are located on the same side, and the inlet of the anode liquid cavity plate and the outlet of the cathode liquid cavity plate are located on the same other side, so that the liquids in their internal cavities flow in opposite directions, forming a cross flow, thereby achieving the purpose of enhancing mass transfer.

[0012] Furthermore, a rectangular array of dense holes is provided in the center of the hollow baffle, and the diameter of the holes is 0.5mm-2mm.

[0013] Furthermore, bolt holes are provided around each module and fluororubber gasket 1, and all modules and fluororubber gasket 1 are assembled in sequence, and the bolt holes around the stacked overall structure are aligned and fixed by corresponding bolt connections.

[0014] Furthermore, it also includes two outer plates, which are provided with bolt holes around them, and both sides of the central cavity of the cathode liquid chamber plate and the anode liquid chamber plate are open; the modules and fluororubber gasket 1 contained in the bionic blade flow electrolytic cell device are assembled in sequence, and fluororubber gasket 2 and the outer plates are respectively arranged on the outermost two sides, and the bolt holes around the stacked overall structure are aligned and fixed by corresponding bolt connections, so that the outer sides of the cathode liquid chamber plate and the anode liquid chamber plate are respectively provided with outer plates, and fluororubber gasket 2 is clamped between the outer plates for sealing.

[0015] Furthermore, the outer plate is made of aluminum alloy.

[0016] Furthermore, the area of ​​the proton exchange membrane is larger than the area of ​​the central cavity of the cathode liquid cavity plate and the anode liquid cavity plate.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] 1) The cavity in the center of the cathode gas cavity plate and the cathode liquid cavity plate of the utility model adopts a bionic blade structure to reduce turbulent dead zones and enhance mass transfer, thereby improving the efficiency of electrocatalytic production of peracetic acid.

[0019] 2) The hollow baffle of the utility model is provided with dense holes in a rectangular array, which can effectively solve the pressure difference between the cathode liquid cavity plate and the cathode gas cavity plate caused by the kinetic energy and gravitational potential energy generated by the flow of liquid and gas, and avoid damage to the gas diffusion electrode.

[0020] 3) The utility model has the advantages of simple structure and low cost, and is easy to realize industrial-scale electrocatalytic application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0022] Figure 2 It is a schematic diagram of the explosion structure of the utility model;

[0023] Figure 3 It is a structural schematic diagram of the cathode and anode liquid cavity plates and the cathode gas cavity plate of the bionic blade in the utility model;

[0024] Figure 4 The computational fluid dynamics simulation diagram of the bionic blade cathode and anode liquid cavity plates and cathode gas cavity plate structure in the utility model;

[0025] Figure 5 It is a schematic diagram of the hollow baffle structure in the utility model.

[0026] In the figure: 1- cathode gas chamber, 2- cathode liquid chamber, 3- cathode gas diffusion electrode, 4- hollow baffle, 5- outer plate, 6- fluororubber gasket 2, 7- anode liquid chamber, 8- anode electrode, 9- fluororubber gasket 1. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with specific embodiments, but the protection scope of the present invention is not limited thereto.

[0028] A bionic blade flow electrolytic cell device for high-efficiency electrocatalytic production of peracetic acid includes multiple modules, including, from left to right, a cathode gas chamber plate 1, a hollow baffle plate 4, a cathode liquid chamber plate 2, a proton exchange membrane, and an anode liquid chamber plate 7, and a fluororubber gasket 9 is clamped between two adjacent module plates for sealing, and a hollow space is provided in the center of the fluororubber gasket 9 to facilitate mass transfer of fluid between the two modules on both sides thereof. A cathode gas diffusion electrode 3 is provided between the side of the cathode gas chamber plate 1 facing the hollow baffle plate 4 and the adjacent fluororubber gasket 9, and the gas entering the cathode gas chamber plate 1 penetrates into the cathode gas diffusion electrode 3 through the hollow baffle plate 4 to participate in the reaction.

[0029] The centers of the cathode liquid cavity plate 2 and the anode liquid cavity plate 7 are both provided with cavities with bionic blade structures, and the bionic blade structures of the two cavities are arranged symmetrically in space, and inlets and outlets communicating with the cavities are respectively provided on opposite sides thereof.

[0030] The outlet of the cathode liquid cavity plate 2 is connected to the inlet of the cathode liquid cavity plate 2 by a pipeline through a circulation pump 1 and a cathode liquid storage tank, forming a circulation loop of the cathode liquid. The outlet of the anode liquid cavity plate 7 is connected to the inlet of the anode liquid cavity plate 7 by a pipeline through a circulation pump 2 and an anode liquid storage tank, forming a circulation loop of the anode liquid. Among them, the outlet of the anode liquid cavity plate 7 and the inlet of the cathode liquid cavity plate 2 are located on the same side, and the inlet of the anode liquid cavity plate 7 and the outlet of the cathode liquid cavity plate 2 are located on the other side of the same, so that the liquid in the internal cavities of the two flow in opposite directions, forming a cross flow, and achieving the purpose of enhancing mass transfer.

[0031] A cavity with a bionic blade structure is provided at the center of the cathode gas chamber plate 1, and an air inlet and an air outlet communicating with the central cavity are respectively provided on opposite sides of the cathode gas chamber plate 1, the air inlet is connected to the oxygen cylinder, and the air outlet is connected to the cathode liquid storage tank by a pipeline, so that the outlet gas of the cathode gas chamber plate 1 is led to the cathode liquid storage tank, thereby realizing the reuse of the gas that has not contacted the electrode surface and increasing the oxygen content of the cathode electrolyte.

[0032] like Figure 3 As shown, the bionic blade structure cavities in the center of the cathode liquid cavity plate 2, the anode liquid cavity plate 7 and the cathode gas cavity plate 1 are respectively introduced with cathode and anode electrolytes and oxygen for reaction.

[0033] like Figure 4 As shown, the cathode liquid cavity plate 2, the anode liquid cavity plate 7 and the cathode gas cavity plate 1 are simulated by computational fluid dynamics, and the gas and liquid flow in the cavity of the bionic blade structure in a uniform state, which greatly improves the mass transfer effect.

[0034] A cathode gas diffusion electrode 3 is provided between the cathode liquid cavity plate 2 and the hollow baffle plate 4. The gas entering the cathode gas cavity plate 1 penetrates into the cathode gas diffusion electrode 3 through the hollow baffle plate 4 to participate in the reaction. Figure 5 As shown, the hollow baffle 4 is a porous structure, which ensures that oxygen and the electrolyte are fully in contact and reacted while preventing the pressure difference from causing damage to the cathode gas diffusion electrode.

[0035] A proton exchange membrane is provided between the anode liquid chamber plate 7 and the cathode liquid chamber plate 2. Figure 1 A fluororubber gasket 9, a proton exchange membrane, a fluororubber gasket 9 and an anode liquid cavity plate 7 are arranged in sequence on the right side of the middle cathode liquid cavity plate 2. The area of ​​the proton exchange membrane is larger than the area of ​​the central cavity of the cathode liquid cavity plate 2 and the anode liquid cavity plate 7.

[0036] In the present invention, an anode electrode 8 is provided between the side of the anode liquid chamber 7 facing the proton exchange membrane and the adjacent fluororubber gasket 9, and the anode electrode 8 and the cathode gas diffusion electrode 3 are both extended to the outside by connecting a Pt sheet or a Cu sheet and connected to a power source. If the anode electrode 8 is a porous structure (such as nickel foam), the solution can be permeated, and its area can be larger than the central cavity area of ​​the anode liquid chamber 7. If it is a structure such as a Pt sheet, its area needs to be smaller than the central cavity area of ​​the anode liquid chamber 7 to achieve electrolyte circulation.

[0037] like Figure 5 As shown, a rectangular array of dense holes is provided in the center of the hollow baffle 4, and the diameter of the holes is 0.5mm-2mm.

[0038] Each module of the present invention is provided with bolt holes around it. The module plates and fluororubber gaskets 9 included in the bionic blade flow electrolytic cell device are assembled in sequence, and the bolt holes around the stacked overall structure are aligned and fixed by corresponding bolt connections.

[0039] Comparison Figure 2 The device of the present invention further comprises two outer plates 5, and both sides of the cavities of the cathode liquid cavity plate 2 and the anode liquid cavity plate 7 are open. The module plates included in the bionic blade flow electrolytic cell device are assembled in sequence, and fluororubber gaskets 6 and outer plates 5 are respectively arranged on the outermost sides, and corresponding bolt holes are arranged around the fluororubber gaskets 6 and the outer plates 5. The bolt holes around the stacked integral structure are aligned and fixed by corresponding bolts, so that the outer sides of the cathode liquid cavity plate 2 and the anode liquid cavity plate 7 are respectively provided with outer plates 5, and fluororubber gaskets 6 are clamped between the outer plates 5 for sealing.

[0040] The material of the outer plate 5 can be aluminum alloy.

[0041] In the following embodiments, the bionic blade flow electrolytic cell device for efficiently electrocatalytically producing peracetic acid can efficiently produce pure liquid peracetic acid in practical applications.

[0042] A bionic blade flow electrolytic cell device is used for electrocatalytic production of peracetic acid. In practical applications, pure liquid peracetic acid can be efficiently produced. The specific steps are as follows: first, assemble the bionic blade flow electrolytic cell device, in which the cathode uses a commercial gas diffusion electrode (model YSL-30T), the anode electrode uses a graphite felt electrode, and the two-electrode chamber is separated by a proton exchange membrane. The specific operation is as follows:

[0043] 50mL of 1mol / L acetic acid aqueous solution was added to the cathode liquid chamber as the cathode electrolyte, and oxygen was introduced into the cathode gas chamber at a flow rate of 10m / s; 50mL of 0.5M Na2SO4 aqueous solution was added to the anode chamber as the anode electrolyte. The electrolytes in the positive and negative electrodes were transported by circulation pumps respectively, and the circulation flow rates were both 50mL / min. Finally, a 20mA / cm 2 The reaction was carried out at a current density of , and the concentration of the product pure liquid peracetic acid reached 1000 mg / L after 1 hour through chemical titration analysis.

[0044] The contents described in this specification are merely an enumeration of implementation forms of the inventive concept, and the protection scope of the present invention should not be regarded as being limited to the specific forms described in the embodiments.

Claims

1. A bionic blade flow electrolytic cell device for efficient electrocatalytic production of peracetic acid, characterized in that: The invention comprises a plurality of modules stacked together in sequence, which are, from left to right, a cathode gas chamber plate (1), a hollow baffle plate (4), a cathode liquid chamber plate (2), a proton exchange membrane and an anode liquid chamber plate (7), and a fluororubber gasket (9) is clamped between two adjacent module plates for sealing, and a hollow space is provided in the center of the fluororubber gasket (9) to facilitate mass transfer of fluid between the two modules on both sides thereof, wherein a cathode gas diffusion electrode (3) is provided between the side of the cathode gas chamber plate (1) facing the hollow baffle plate (4) and the adjacent fluororubber gasket (9), and the gas entering the cathode gas chamber plate (1) penetrates into the cathode gas diffusion electrode (3) through the hollow baffle plate (4) to participate in the reaction; An anode electrode (8) is provided between the side of the anode liquid cavity plate (7) facing the proton exchange membrane and the adjacent fluororubber gasket (9), and the anode electrode (8) and the cathode gas diffusion electrode (3) are both extended to the outside by connecting a Pt sheet or a Cu sheet and connected to a power source; The cathode liquid chamber plate (2) and the anode liquid chamber plate (7) are both provided with cavities with bionic blade structures at their centres, and the bionic blade structures of the two cavities are spatially symmetrically arranged, and inlets and outlets communicating with the cavities are respectively provided on opposite sides thereof.

2. A bionic blade flow electrolytic cell device for high-efficiency electrocatalytic production of peracetic acid as claimed in claim 1, characterized in that: The outlet of the cathode liquid cavity plate (2) is connected to the inlet of the cathode liquid cavity plate (2) via a pipeline via a circulation pump 1 and a cathode liquid storage tank, thereby forming a cathode liquid circulation loop.

3. A bionic blade flow electrolytic cell device for high-efficiency electrocatalytic production of peracetic acid as claimed in claim 2, characterized in that: A cavity with a bionic blade structure is provided at the center of the cathode gas cavity plate (1), and an air inlet and an air outlet communicating with the central cavity are provided on opposite sides of the cathode gas cavity plate (1), the air inlet is connected to an oxygen cylinder, and the air outlet is connected to the cathode liquid storage tank by a pipeline, so that the gas outlet of the cathode gas cavity plate (1) is connected to the cathode liquid storage tank, so that the gas that does not contact the electrode surface is reused, thereby increasing the oxygen content of the cathode electrolyte.

4. The bionic blade flow electrolytic cell device for high-efficiency electrocatalytic production of peracetic acid according to claim 1, characterized in that: The outlet of the anode liquid cavity plate (7) is connected to the inlet of the anode liquid cavity plate (7) by a pipeline through a circulation pump 2 and an anode liquid storage tank, thereby forming an anode liquid circulation loop; wherein the outlet of the anode liquid cavity plate (7) and the inlet of the cathode liquid cavity plate (2) are located on the same side, and the inlet of the anode liquid cavity plate (7) and the outlet of the cathode liquid cavity plate (2) are located on the same other side, so that the liquids in their internal cavities flow in opposite directions, forming a cross flow, thereby achieving the purpose of enhancing mass transfer.

5. The bionic blade flow electrolytic cell device for high-efficiency electrocatalytic production of peracetic acid as claimed in claim 1, characterized in that: The hollow baffle (4) is provided with a rectangular array of dense holes in the center, and the diameter of the holes is 0.5 mm-2 mm.

6. The bionic blade flow electrolytic cell device for high-efficiency electrocatalytic production of peracetic acid as claimed in claim 1, characterized in that: Each module and fluororubber gasket 1 (9) is provided with bolt holes around its periphery. All modules and fluororubber gasket 1 (9) are assembled in sequence, and the bolt holes around the stacked overall structure are aligned and fixed by corresponding bolt connections.

7. A bionic blade flow electrolytic cell device for high-efficiency electrocatalytic production of peracetic acid as claimed in claim 6, characterized in that: It also includes two outer plates (5), the outer plates (5) are provided with bolt holes around their peripheries, and both sides of the central cavities of the cathode liquid chamber plate (2) and the anode liquid chamber plate (7) are open; the modules and the fluororubber gasket 1 (9) included in the bionic blade flow electrolytic cell device are assembled in sequence, and the fluororubber gasket 2 (6) and the outer plates (5) are respectively provided on the outermost sides, and the bolt holes around the stacked overall structure are aligned and fixed by corresponding bolt connection, so that the outer sides of the cathode liquid chamber plate (2) and the anode liquid chamber plate (7) are respectively provided with the outer plates (5), and the fluororubber gasket 2 (6) is clamped between the outer plates (5) for sealing.

8. A bionic blade flow electrolytic cell device for high-efficiency electrocatalytic production of peracetic acid as claimed in claim 7, characterized in that: The material of the outer plate (5) is aluminum alloy.

9. The bionic blade flow electrolytic cell device for high-efficiency electrocatalytic production of peracetic acid as claimed in claim 1, characterized in that: The area of ​​the proton exchange membrane is larger than the area of ​​the central cavity of the cathode liquid cavity plate (2) and the anode liquid cavity plate (7).

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