A nitrophenol conversion and power generation integrated device

Abstract

In view of the destructiveness and energy consumption problems of traditional organic pollutant wastewater treatment methods, it is urgently needed to develop a new device with green conversion, zero carbon emission and energy gain. Based on the chemical reaction characteristics of nitrophenol, the invention discloses a nitrophenol conversion and power generation integrated device, which is composed of a rectangular parallelepiped flow electrolytic cell frame (1), a nitrophenol cathode pool (2), a sodium borohydride anode pool (3), an ion exchange membrane electrode (4-6), an observation window (11) and (12), a gas outlet (13), a feed port (14) and (15), a discharge port (16) and (17), a liquid feed pump (7) and (8), a liquid storage tank (9) and (10), a valve (18) and (19), a connecting conduit (20) and a circuit wire (21). By converting nitrophenol reduction and sodium borohydride oxidation reaction into electrode reaction, the two reactions are spatially "decoupled", thereby generating electric energy output while obtaining an aminophenol product, realizing that material conversion and energy release are carried out synchronously.

Description

Technical Field

[0001] The invention relates to a nitrophenol conversion and power generation integrated device, belonging to the technical field of new energy and environmental protection. Background Art

[0002] Nitrophenol wastewater treatment is a crucial step in industrial wastewater treatment, extensively used in industries such as food processing, printing and dyeing, papermaking, and leather processing. To ensure that wastewater meets national standards, current methods for treating nitrophenol wastewater include physical methods such as adsorption and membrane separation, biodegradation and consumption, chemical flocculation and oxidation, and field-assisted degradation methods such as light, heat, and ultrasound. These methods separate or oxidize organic matter to purify the water. However, these methods fail to effectively transform the organic matter into valuable resources, consuming external energy and generating carbon emissions.

[0003] Guided by the goal of carbon neutrality, developing a system with green conversion, zero carbon emissions, and energy gain to surpass traditional methods of treating wastewater containing organic pollutants has important scientific significance and practical value. Summary of the Invention

[0004] Aiming at the shortcomings of traditional methods for treating wastewater containing organic pollutants, the present invention provides a new approach to treating nitrophenol wastewater. Based on the chemical reaction characteristics of nitrophenol-based organic compounds, a nitrophenol conversion and power generation integrated device is disclosed.

[0005] A nitrophenol conversion and power generation integrated device is characterized by comprising a rectangular parallelepiped flow electrolytic cell frame (1), a nitrophenol cathode cell (2), a sodium borohydride anode cell (3), a cathode coating (4), an anode coating (5), an ion exchange membrane (6), a cathode cell observation window (11) and an anode cell observation window (12), a gas outlet (13), a cathode liquid storage tank feed port (14) and an anode cell liquid storage tank feed port (15), a cathode liquid storage tank discharge port (16) and an anode liquid storage tank discharge port (17), a cathode liquid inlet pump (7) and an anode liquid inlet pump (8), a cathode liquid storage tank (9) and an anode liquid storage tank (10), a cathode liquid inlet pipeline valve (18) and anode liquid inlet pipeline valve (19), a conduit (20) and a circuit conductor (21).

[0006] A rectangular parallelepiped flow electrolytic cell frame (1) is installed, and various components and a conduit (20) are connected. When the inlet pump of the device is working, the electrolyte in the cathode cell and the anode cell is in a flowing state, and electric energy can be continuously output to the outside. When the inlet pump stops working, the electrolyte in the cathode cell and the anode cell is in a non-flowing state, and electric energy can be output to the outside intermittently.

[0007] The nitrophenol cathode pool (2) and the sodium borohydride anode pool (3) are equipped with transparent windows, which can be used to observe the color change of the solution and judge the reaction degree; they can also serve as in-situ spectrum detection windows to monitor the reaction kinetics process.

[0008] The nitrophenol cathode cell (2) is connected to the cathode liquid storage tank (9) via a conduit (20); in the nitrophenol cathode cell (2), the solute is one or more of p-nitrophenol, m-nitrophenol and o-nitrophenol.

[0009] The sodium borohydride anode cell (3) is equipped with a gas outlet (13) for safe discharge / collection of hydrogen; the sodium borohydride anode cell (3) is connected to the anode liquid storage tank (10) via a conduit (20).

[0010] In the nitrophenol conversion and power generation integrated device, the structure of the ion exchange membrane electrode includes a cathode coating (4), an anode coating (5) and an ion exchange membrane (6). The main body of the ion exchange membrane electrode is an anion exchange membrane or a cation exchange membrane.

[0011] The coatings loaded on both sides of the ion exchange membrane electrode serve as cathode and anode respectively, and serve as positive electrode and negative electrode of the battery respectively, and are connected to an external circuit via a circuit conductor (21) to provide electrical energy.

[0012] The coating layer supported by the ion exchange membrane electrode contains a catalyst, conductive carbon and a binder.

[0013] Furthermore, the cathode catalyst is preferably nickel oxide or bismuth-doped nickel oxide catalyst.

[0014] Furthermore, the anode catalyst is preferably palladium-carbon or palladium-copper catalyst.

[0015] The liquid storage tank is equipped with a feed port and a discharge port, which are respectively located at the upper side and the bottom of the tank body.

[0016] The valve and the liquid inlet pump are installed on the conduit and can control continuous or intermittent liquid inlet and the liquid inlet rate.

[0017] The working principle of the present invention is to convert the nitrophenol reduction reaction and the sodium borohydride oxidation reaction into electrode reactions, so that the two reactions are spatially "decoupled", thereby generating electric energy while obtaining the aminophenol product.

[0018] The chemical equation for the reaction of nitrophenol and sodium borohydride is:

[0019] NO2C6H4OH + NaBH4 = NH2C6H4OH + NaBO2 + H2↑

[0020] The bipolar reaction equations after designing into electrode reactions are:

[0021] Cathode: NO2C6H4OH + 4H2O + 6e - = NH2C6H4OH + 6OH -

[0022] Anode: NaBH4 + 6OH - = NaBO2 + 4H2O + H2↑ + 6e -

[0023] The reaction proceeds spontaneously, providing electrical energy output via a galvanic cell. Upon completion, aminophenol can be isolated and purified from the cathode electrolyte. Furthermore, a certain amount of H₂ product can be collected at the anode during the ongoing reaction.

[0024] The present invention is beneficial in that the chemical energy generated during the reduction reaction of nitrophenol to aminophenol is converted into electrical energy output, achieving simultaneous material conversion and energy release. As a battery that supplies external energy, the device's energy density and power density can be independently controlled. Energy density is determined by the amount of reactants; increasing the amount of nitrophenol and reducing agent raw materials can increase the total energy output; power density is determined by the reaction flux; increasing the electrode active area can increase power output. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Attachment Figure 1 This is a schematic diagram of an integrated nitrophenol conversion and power generation device. Figure 1 shows the rectangular flow electrolytic cell frame; 2 is the nitrophenol cathode cell; 3 is the sodium borohydride anode cell; 4 is the cathode coating; 5 is the anode coating; 6 is the ion exchange membrane; 4-6 together form the ion exchange membrane electrode; 7 and 8 are the cathode and anode liquid inlet pumps, respectively; 9 and 10 are the cathode and anode liquid storage tanks, respectively; 11 and 12 are the cathode and anode cell observation windows, respectively; 13 is the gas outlet; 14 and 15 are the cathode and anode liquid storage tank feed ports, respectively; 16 and 17 are the cathode and anode liquid storage tank discharge ports, respectively; 18 and 19 are the valves for the cathode and anode liquid inlet pipes, respectively; 20 is a conduit; and 21 is a circuit conductor. Specific embodiments

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clear, the following is a further detailed description with reference to the embodiments.

[0027] As attached Figure 1As shown, a nitrophenol conversion and power generation integrated device is composed of a rectangular parallelepiped flow electrolytic cell frame (1), a nitrophenol cathode cell (2), a sodium borohydride anode cell (3), ion exchange membrane electrodes (4-6), observation windows (11) and (12), a gas outlet (13), a feed port (14 and 15), a discharge port (16 and 17), a liquid feed pump (7 and 8), a liquid storage tank (9 and 10), valves (18 and 19), a conduit 20 and a circuit conductor 21.

[0028] The part fixed by the rectangular parallelepiped flow electrolytic cell frame 1 includes a nitrophenol cathode pool (2), a sodium borohydride anode pool (3), and ion exchange membrane electrodes (4-6), constituting the main body of the device.

[0029] The nitrophenol cathode cell (2) is provided with an observation window (11), connected to a cathode liquid storage tank (9) and a valve (18) via a conduit (20), and provided with liquid inlet power by a liquid inlet pump (7). A feed inlet (14) is provided on the upper side of the tank body of the cathode liquid storage tank (9), and a discharge port (16) is provided on the bottom.

[0030] The sodium borohydride anode cell (3) is provided with an observation window (12) and a gas outlet (13). The sodium borohydride anode cell (3) is connected to the anode liquid storage tank (10) and a valve (19) via a conduit (20). The liquid inlet pump (8) provides liquid inlet power. The anode liquid storage tank (10) is provided with a feed port (15) on the upper side of the tank body and a discharge port (17) on the bottom.

[0031] The structure of the ion exchange membrane electrodes 4-6 includes: 4 is a cathode coating, 5 is an anode coating, and 6 is an ion exchange membrane. The cathode and anode coatings are connected to a circuit conductor (21) to supply power to the outside.

[0032] During operation, a sufficient amount of electrolyte is injected into the cathode and anode liquid storage tanks (9 and 10) from the feed ports (14 and 15) of the cathode and anode liquid storage tanks, respectively. The valves (18 and 19) are opened, the liquid inlet pumps (7 and 8) are kept running, and the solution is introduced into the nitrophenol cathode pool (2) and the sodium borohydride anode pool (3). The nitrophenol and sodium borohydride in the solution react with each other on the surfaces of the cathode coating (4) and the anode coating (5) of the ion exchange membrane electrode. The nitrophenol substance undergoes reduction transformation at the cathode, and the sodium borohydride is reduced at the anode. At the same time, the device outputs electrical energy to the outside through the wire (21). The solution is kept flowing continuously, and electrical energy can be continuously output to the outside until the cathode and anode reaction substances are completely consumed. If the liquid inlet pump stops working and the electrolyte in the cathode pool and the anode pool is not flowing, electrical energy can be output to the outside intermittently. The observation windows (11 and 12) can be used to observe the color change of the solution and judge the degree of reaction; the gas outlet (13) generated by the anode reaction can be used to safely collect hydrogen.

[0033] The above description is only a preferred embodiment and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A nitrophenol conversion and power generation integrated device, characterized in that: The invention comprises a rectangular parallelepiped flow electrolytic cell frame (1), a nitrophenol cathode cell (2), a sodium borohydride anode cell (3), a cathode coating (4), an anode coating (5), an ion exchange membrane (6), a cathode cell observation window (11), an anode cell observation window (12), a gas outlet (13), a cathode liquid storage tank feed port (14), an anode cell liquid storage tank feed port (15), a cathode liquid storage tank discharge port (16), an anode liquid storage tank discharge port (17), a cathode liquid inlet pump (7), an anode liquid inlet pump (8), a cathode liquid storage tank (9), an anode liquid storage tank (10), a cathode liquid inlet pipe valve (18), an anode liquid inlet pipe valve (19), a conduit (20), and a circuit conductor (21); In the nitrophenol conversion and power generation integrated device, the portion fixed by the rectangular flow electrolytic cell frame (1) comprises a nitrophenol cathode pool (2), a sodium borohydride anode pool (3), and an ion exchange membrane electrode constituting the main body of the device; In the nitrophenol conversion and power generation integrated device, the nitrophenol cathode pool (2) is connected to the cathode liquid storage tank (9) via a conduit (20); the solute in the nitrophenol cathode pool (2) is one or more of p-nitrophenol, m-nitrophenol, and o-nitrophenol; the sodium borohydride anode pool (3) is equipped with a gas outlet (13), and the sodium borohydride anode pool (3) is connected to the anode liquid storage tank (10) via a conduit (20); In the nitrophenol conversion and power generation integrated device, the structure of the ion exchange membrane electrode includes a cathode coating (4), an anode coating (5) and an ion exchange membrane (6); the coatings loaded on both sides of the ion exchange membrane (6) serve as the cathode and anode, respectively, and serve as the positive electrode and negative electrode of the battery, respectively, and are connected to an external circuit through a circuit conductor (21) to provide electrical energy; wherein, the coating loaded on the ion exchange membrane electrode contains a catalyst, conductive carbon and an adhesive; the cathode catalyst is nickel oxide or bismuth-doped nickel oxide catalyst, and the anode catalyst is palladium carbon or palladium copper catalyst.

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