CN112281184A - Device and method for electrochemically generating hydrogen peroxide - Google Patents
Device and method for electrochemically generating hydrogen peroxide Download PDFInfo
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- CN112281184A CN112281184A CN202010981254.1A CN202010981254A CN112281184A CN 112281184 A CN112281184 A CN 112281184A CN 202010981254 A CN202010981254 A CN 202010981254A CN 112281184 A CN112281184 A CN 112281184A
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- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
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Abstract
The invention discloses a device and a method for electrochemically generating hydrogen peroxide. It includes reaction tank and power, be equipped with the cathode electrode on the inside wall of reaction tank, be equipped with the apron on the reaction tank, be equipped with anode electrode on the apron, all be equipped with the catalyst on cathode electrode and the anode electrode, be equipped with electrolyte in the reaction tank, be equipped with intake pipe and outlet duct on the apron, the one end of intake pipe is installed at the apron, the other end of intake pipe is arranged in the reaction tank and is contacted with electrolyte, the one end of outlet duct is installed at the apron, the outside of apron is arranged in to the other end of outlet duct, be equipped with input port and output port on the reaction tank, cathode. The invention has the beneficial effects that: this structural design is simple, does not need the diaphragm, and is with low costs, and the homogeneity of the horizontal direction electric field of assurance has increased the stability and the expandability of equipment, more conveniently integrates into in various small-size domestic equipment such as disinfect, pleasing to the eye and practical.
Description
Technical Field
The invention relates to the technical field of chemical equipment, in particular to a device and a method for electrochemically generating hydrogen peroxide.
Background
Hydrogen peroxide solutions are important chemicals for a variety of industrial applications, including chemical synthesis, pulp and paper making, textile bleaching, cleaning and etching, environmental protection, health consumer applications, and the like. As an efficient harmless and residue-free oxidant, the compound is widely applied to sterilization and disinfection of water and treatment of organic pollutants. Hydrogen peroxide currently used industrially is mainly produced by electrolytic or anthraquinone processes.
The electrolysis method mainly comprises the steps of producing ammonium persulfate by electrolyzing ammonium sulfate solution, flowing out of an anode chamber, wherein the content of the ammonium persulfate is about 180-240 g/L, and supplying the ammonium persulfate for hydrolysis through a storage tank. Under reduced pressure, the ammonium persulfate solution enters a hydrolysis distiller for hydrolysis distillation. The hydrogen peroxide is evaporated out along with steam and acid mist, the acid mist is removed through a separator, and the hydrogen peroxide is rectified in a distillation tower to obtain the hydrogen peroxide (the controlled concentration is 27.5 percent) from the bottom of the tower.
(NH4)2S2O8+2H2O→2NH4HSO4+H2O2
The anthraquinone method uses hydrogenated terpineol and benzene (volume ratio is 1: 1) as a working solution of a solvent, contains 100-110 g/L of 2-ethyl anthraquinone and 70-80 g/L of tetrahydro 2-ethyl anthraquinone, and the working solution is conveyed into a reaction kettle filled with a nickel catalyst through a quantitative pump. Continuously introducing hydrogen to hydrogenate at a pressure of 0.2-0.3 kPa and a temperature of 50-60 ℃ to control the hydrogenation degree to 50%. And filtering the hydrogenated liquid, feeding the filtered hydrogenated liquid into an oxidation tower at the top, and carrying out countercurrent oxidation on the hydrogenated liquid and oxygen at the temperature of 40-50 ℃. The oxidizing solution is subjected to countercurrent extraction by water to obtain a hydrogen peroxide aqueous solution with the concentration of 27.5-30%, and then a finished product is extracted and purified by benzene. Both of the two large-scale production methods consume a large amount of electric energy, are complicated in steps, have high requirements on sites and can only be used for large-scale centralized production. On the other hand, the hydrogen peroxide solution is unstable and can be automatically decomposed into water and oxygen at normal temperature, so that safety risks exist in transportation and storage, and corresponding cost is increased.
Disclosure of Invention
The invention provides a device and a method for electrochemically generating hydrogen peroxide with low cost to overcome the defects in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a device of electrochemistry production hydrogen peroxide, includes reaction tank and power, be equipped with the cathode electrode on the inside wall of reaction tank, the reaction tank on be equipped with the apron, the apron on be equipped with the anode electrode, cathode electrode and anode electrode on all be equipped with the catalyst, the reaction tank in be equipped with electrolyte, the apron on be equipped with intake pipe and outlet duct, the one end of intake pipe is installed at the apron, the other end of intake pipe is arranged in the reaction tank and is contacted with electrolyte, the one end of outlet duct is installed at the apron, the outside of apron is arranged in to the other end of outlet duct, the reaction tank on be equipped with input port and output port, cathode electrode and anode electrode all be connected with the power electricity.
The core of the technology is to design a novel high-efficiency clean small-sized dispersive electrochemical reactor without a membrane, and hydrogen peroxide can be generated by two-electron oxygen reduction in real time on site. The device is designed and constructed by a cathode electrode, an anode electrode and a cathode electrode, and a middle reaction tank enclosed by the electrodes, wherein the reaction tank is connected with an air inlet pipe, an input port and an output port of hydrogen peroxide, and the cathode electrode and the anode electrode are externally connected with a power supply. Compared with a common electrochemical reactor, the structure is simple in design, does not need a diaphragm and is low in cost.
Preferably, the reaction tank is in the shape of a cylinder with a hollow interior, the cover plate is mounted on the reaction tank and is in sealed connection with the reaction tank, one end of the anode electrode is mounted on the cover plate, and the other end of the anode electrode is placed in the reaction tank and is in contact with the electrolyte. The cylindrical design also makes it as the core, more conveniently integrates in equipment such as various small-size domestic disinfections, and is pleasing to the eye and practical.
Preferably, the cathode electrode is in a circular ring shape, the cathode electrode is attached to the inner side surface of the reaction tank, and the anode electrode is a carbon column electrode and is installed at the center of the cover plate. The unique design can ensure that the cathode surface is maximized in a limited space, a certain amount of hydrogen peroxide can be generated more quickly and effectively, and the design of the annular electrode ensures the uniformity of an electric field in the horizontal direction, thereby increasing the stability and the expandability of the equipment.
Preferably, the cathode electrode and the anode electrode are both made of conductive materials, and the cathode electrode and the anode electrode are both plated through an anode or are physically attached with catalysts.
Preferably, the cathode electrode and the anode electrode are made of graphite or copper tubes, and the catalyst is a carbon-based catalyst.
Preferably, the electrolyte is a weak base conductive solution with water as a carrier, and the weak base is NaHCO3、NaCO3、KHCO3、K2CO3One or more of (a).
The invention also provides a method for electrochemically generating hydrogen peroxide, which specifically comprises the following steps:
(1) after power of a power supply is input, a two-electron oxygen reduction reaction is carried out on the surface of a catalyst coating of a cathode motor, oxygen is taken as a reactant, and generated hydrogen peroxide can be diffused to a reaction tank;
(2) the anode electrode can carry out water oxidation reaction in the same step, and the electrolyte in the reaction tank is taken as a reactant to generate oxygen;
(3) the concentration of hydrogen peroxide in the reaction tank will gradually increase with the reaction time until reaching an equilibrium or maximum concentration state, and is collected through an output port of the reaction tank.
Preferably, in step (1), hydrogen peroxide is generated by two-electron oxygen reduction, and the specific cathode electrode reaction is as follows:
O2 + 2(H+ + e-)→H2O2。
preferably, in step (2), the anode electrode is matched to the electrolytic anode for water oxidation, and the reaction is as follows:
H2O→0.5O2+2(H+ + e-)。
the invention has the beneficial effects that: this structural design is simple, does not need the diaphragm, and is with low costs, can guarantee in finite space for negative pole surface maximize can be faster more effectual produces a certain amount of hydrogen peroxide, and the homogeneity of the horizontal direction electric field that annular electrode's design was guaranteed has increased the stability and the expandability of equipment, more conveniently integrates into in equipment such as various small-size domestic disinfections, pleasing to the eye and practical.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a flow chart of the method of the present invention.
In the figure: 1. catalyst, 2, cover plate, 3, anode electrode, 4, gas outlet pipe, 5, gas inlet pipe, 6, electrolyte, 7, cathode electrode, 8, reaction tank and 9, power supply.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
In the embodiment shown in fig. 1, an apparatus for electrochemically generating hydrogen peroxide includes a reaction tank 8 and a power supply 9, a cathode electrode 7 is disposed on the inner side wall of the reaction tank 8, a cover plate 2 is disposed on the reaction tank 8, an anode electrode 3 is disposed on the cover plate 2, catalysts 1 are disposed on the cathode electrode 7 and the anode electrode 3, an electrolyte 6 is disposed in the reaction tank 8, an air inlet pipe 5 and an air outlet pipe 4 are disposed on the cover plate 2, one end of the air inlet pipe 5 is mounted on the cover plate 2, the other end of the air inlet pipe 5 is disposed in the reaction tank 8 and contacts with the electrolyte 6, one end of the air outlet pipe 4 is mounted on the cover plate 2, the other end of the air outlet pipe 4 is disposed in the outer side of the cover plate 2, an.
The reaction tank 8 is shaped as an inner partThe cover plate 2 is arranged on the reaction tank 8 and is hermetically connected with the reaction tank 8, one end of the anode electrode 3 is arranged on the cover plate 2, and the other end of the anode electrode 3 is arranged in the reaction tank 8 and is in contact with the electrolyte 6. The cathode electrode 7 is in a ring shape, the cathode electrode 7 is attached to the inner side surface of the reaction tank 8, and the anode electrode 3 is a carbon column electrode and is installed at the center of the cover plate 2. The cathode electrode 7 and the anode electrode 3 are both made of conductive materials, and the cathode electrode 7 and the anode electrode 3 are both plated through an anode or are physically attached with the catalyst 1. The cathode electrode 7 and the anode electrode 3 are made of graphite or copper tubes, and the catalyst 1 is a carbon-based catalyst. The electrolyte 6 is a weak base conductive solution with water as a carrier, and the weak base is NaHCO3、NaCO3、KHCO3、K2CO3One or more of (a).
The power supply 9 part comprises, but is not limited to, a lithium battery or a wall plug and other conventional technologies, and is used for supplying power for electrochemical reaction by voltage transformation and voltage stabilization, wherein the voltage is controlled to be between 0 and 20V and the current is between 10 and 500 mA. The anode electrode 3 is made of a material including but not limited to graphite and copper tube, and is used for performing a water oxidation reaction to complete a reaction closed loop. Catalyst 1 is a wide variety of catalytic materials known in the market for use in fuel cell reactions. The cathode electrode 7 is an electrode for hydrogen peroxide reaction, is made of graphite and copper pipe materials, and is used for executing oxygen reduction reaction to complete reaction closed loop. The reaction tank 8 is a cavity where reaction occurs, reaction products fall off from the electrodes and enter a water body for collection, the reaction product part comprises an output port in an unfixed form and is used for leading out the reaction products, the form of the output port is determined according to a specific product interface, and the input port is used for inputting the electrolyte 6. The gas inlet pipe 5 is used for active aeration, and oxygen is introduced into the reaction tank 8 to be used as a raw material of electrochemical reaction. The outlet pipe 4 is used for discharging air pressure and unreacted air which may be accumulated during the reaction process.
As shown in fig. 2, the present invention also provides a method for electrochemically generating hydrogen peroxide, which specifically comprises the following steps:
(1) after power of a power supply is input, a two-electron oxygen reduction reaction is carried out on the surface of a catalyst coating of a cathode motor, oxygen is taken as a reactant, and generated hydrogen peroxide can be diffused to a reaction tank; hydrogen peroxide is produced by two-electron oxygen reduction, and the specific cathode electrode reaction is as follows:
O2 + 2(H+ + e-)→H2O2
(2) the anode electrode can carry out water oxidation reaction in the same step, and the electrolyte in the reaction tank is taken as a reactant to generate oxygen; anode electrode matching the electrolytic anode for water oxidation, the reaction is as follows:
H2O→0.5O2+2(H+ + e-)
the total reaction is as follows:
H2O+0.5O2→H2O2
the cathodic two-electron oxygen reduction and the anodic water oxidation reaction can be catalyzed by reported effective carbon-based catalysts, and no rigid requirements are imposed on the electrical conductivity and the acidity and alkalinity of the liquid.
(3) The concentration of hydrogen peroxide in the reaction tank will gradually increase with the reaction time until reaching an equilibrium or maximum concentration state, and is collected through an output port of the reaction tank.
Wherein: the reaction tank is designed into a cylindrical tank, the cathode is an annular electrode, the anode is a carbon column electrode on the inner surface of the cylindrical tank, and the unique design can ensure limited space at the center of the cylindrical tank, so that the surface of the cathode is maximized, a certain amount of hydrogen peroxide can be generated more quickly and effectively, the uniformity of a horizontal electric field is ensured by the design of the annular electrode, and the stability and expandability of the equipment are improved. The device will innovate and complement the large-scale, energy-intensive and tedious anthraquinone preparation process of hydrogen peroxide in the existing industry, synthesize the hydrogen peroxide through the oxygen reduction electrochemical reaction, and provide a simpler and more sustainable method to realize the use value of the important chemical to the maximum extent. Especially for the domestic sterilization of drinking water and the like, the production method can promote the hydrogen peroxide to be produced to purify the drinking water and sterilize in the areas with the drinking water problems in developing countries anytime and anywhere. The device can generate the hydrogen peroxide solution with medium and low concentration safely with high efficiency and low power consumption, and can be widely applied to the fields of household sterilization and disinfection, personal hygiene, fruit and vegetable cleaning, organic sewage treatment and the like.
Claims (9)
1. The device for electrochemically generating hydrogen peroxide is characterized by comprising a reaction tank (8) and a power supply (9), wherein a cathode electrode (7) is arranged on the inner side wall of the reaction tank (8), a cover plate (2) is arranged on the reaction tank (8), an anode electrode (3) is arranged on the cover plate (2), catalysts (1) are arranged on the cathode electrode (7) and the anode electrode (3), electrolyte (6) is arranged in the reaction tank (8), an air inlet pipe (5) and an air outlet pipe (4) are arranged on the cover plate (2), one end of the air inlet pipe (5) is arranged on the cover plate (2), the other end of the air inlet pipe (5) is arranged in the reaction tank (8) and is in contact with the electrolyte (6), one end of the air outlet pipe (4) is arranged on the cover plate (2), the other end of the air outlet pipe (4) is arranged on the outer side of the cover, the reaction tank (8) is provided with an input port and an output port, and the cathode electrode (7) and the anode electrode (3) are electrically connected with a power supply (9).
2. An electrochemical hydrogen peroxide generation device according to claim 1, wherein the reaction tank (8) is in the shape of a cylinder with a hollow interior, the cover plate (2) is mounted on the reaction tank (8) and is hermetically connected with the reaction tank (8), one end of the anode electrode (3) is mounted on the cover plate (2), and the other end of the anode electrode (3) is disposed in the reaction tank (8) and is in contact with the electrolyte (6).
3. An apparatus for electrochemical generation of hydrogen peroxide according to claim 2, wherein the cathode electrode (7) is in the shape of a circular ring, the cathode electrode (7) is attached to the inner surface of the reaction chamber (8), and the anode electrode (3) is a carbon column electrode and is installed at the center of the cover plate (2).
4. An apparatus for electrochemical generation of hydrogen peroxide according to claim 1, 2 or 3, characterized in that the cathode electrode (7) and the anode electrode (3) are made of conductive material, and the cathode electrode (7) and the anode electrode (3) are both anodized or physically attached with the catalyst (1).
5. An apparatus for electrochemical generation of hydrogen peroxide according to claim 4, characterized in that the cathode electrode (7) and the anode electrode (3) are made of graphite or copper tube and the catalyst (1) is a carbon based catalyst.
6. An apparatus for the electrochemical generation of hydrogen peroxide according to claim 1, characterized in that said electrolyte (6) is a conductive solution of weak base with water as carrier, said weak base being NaHCO3、NaCO3、KHCO3、K2CO3One or more of (a).
7. A method for electrochemically generating hydrogen peroxide is characterized by comprising the following steps:
(1) after power of a power supply is input, a two-electron oxygen reduction reaction is carried out on the surface of a catalyst coating of a cathode motor, oxygen is taken as a reactant, and generated hydrogen peroxide can be diffused to a reaction tank;
(2) the anode electrode can carry out water oxidation reaction in the same step, and the electrolyte in the reaction tank is taken as a reactant to generate oxygen;
(3) the concentration of hydrogen peroxide in the reaction tank will gradually increase with the reaction time until reaching an equilibrium or maximum concentration state, and is collected through an output port of the reaction tank.
8. The method of claim 7, wherein the hydrogen peroxide is generated by two-electron oxygen reduction in step (1), and the cathode electrode reaction is as follows:
O2 + 2(H+ + e-)→H2O2。
9. the method of claim 8, wherein in step (2), the anode electrode is matched to the electrolytic anode for water oxidation by the following reaction:
H2O→0.5O2+2(H+ + e-)。
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113621980A (en) * | 2021-09-10 | 2021-11-09 | 浙江清越科技有限公司 | Flow type electrochemical device for preparing hydrogen peroxide |
| CN113621981A (en) * | 2021-09-14 | 2021-11-09 | 浙江清越科技有限公司 | Series flow type hydrogen peroxide electrochemical generation device |
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| CN103695958A (en) * | 2013-12-13 | 2014-04-02 | 南开大学 | Configuration of air diffusion cathode for efficiently producing hydrogen peroxide and preparation method thereof |
| JP2014198310A (en) * | 2013-03-29 | 2014-10-23 | 国立大学法人福井大学 | Compact electrolytic water generator |
| WO2018075483A1 (en) * | 2016-10-17 | 2018-04-26 | The Board Of Trustees Of The Leland Stanford Junior University | Electrochemical hydrogen peroxide generating device |
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| CN2698812Y (en) * | 2004-04-21 | 2005-05-11 | 杨凤林 | Electrochemical reactor for in situ hydrogen peroxide generation by electrocatalysis |
| CN101495679A (en) * | 2006-05-25 | 2009-07-29 | 环球油品有限责任公司 | In situ generation of hydrogen peroxide |
| JP2014198310A (en) * | 2013-03-29 | 2014-10-23 | 国立大学法人福井大学 | Compact electrolytic water generator |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113621980A (en) * | 2021-09-10 | 2021-11-09 | 浙江清越科技有限公司 | Flow type electrochemical device for preparing hydrogen peroxide |
| CN113621980B (en) * | 2021-09-10 | 2024-01-30 | 浙江清越科技有限公司 | Flow type electrochemical device for preparing hydrogen peroxide |
| CN113621981A (en) * | 2021-09-14 | 2021-11-09 | 浙江清越科技有限公司 | Series flow type hydrogen peroxide electrochemical generation device |
| CN113621981B (en) * | 2021-09-14 | 2023-07-28 | 浙江清越科技有限公司 | Series flow type hydrogen peroxide electrochemical generation device |
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