TWM629398U - Device for carbon dioxide electrolysis - Google Patents

Abstract

A device for carbon dioxide electrolysis is provided. The device for carbon dioxide electrolysis includes electrochemical electrolysis equipment and an absorption unit fluidly connected with the electrochemical electrolysis equipment. The electrochemical electrolysis equipment is used to electrolyze a cathode reactant and an anode reactant so as to form a cathode mixture and an anode mixture. The cathode reactant includes carbon dioxide or compounds that containing a bicarbonate group or a carbonate group. The cathode mixture includes carbon monoxide and hydrogen gas. The anode mixture includes oxygen gas. The absorption unit is used to process the cathode mixture so as to separate out a syngas containing carbon monoxide and hydrogen gas.

Description

Electrolyzer for carbon dioxide

The present invention relates to an electrolysis device for carbon dioxide, in particular to an electrolysis device for carbon dioxide that can generate synthesis gas.

Carbon dioxide gas, which is produced by burning petrochemical materials, is the main cause of the greenhouse effect. In order to alleviate the problem of global warming, how to convert carbon dioxide gas into other reusable energy sources is one of the important research and development goals at present.

In the prior art, various techniques for reducing carbon dioxide are disclosed. One such technique is to combine photocatalysts with water-splitting systems to reduce carbon dioxide in a manner similar to plant photosynthesis systems. The photocatalytic decomposition of water is used to generate hydrogen ions, and then the hydrogen ions are used to reduce carbon dioxide. However, this device is a batch reaction device, which is not conducive to handling a large amount of carbon dioxide.

Another technique for reducing carbon dioxide is to dissolve carbon dioxide in an electrolyte to reduce carbon dioxide by means of electrocatalysis. However, the diffusivity and concentration of carbon dioxide can be affected by time, which in turn affects the conversion rate of carbon dioxide. In addition, the reduction products of carbon dioxide contain a variety of hydrocarbons, such as methane, methanol, ethane, ethanol, acetic acid or ethylene, but not all products can be used as fuels or as basic raw materials for other chemicals. It needs to go through multiple separation and purification steps, and has the disadvantage of complicated steps.

Therefore, how to reduce carbon dioxide in order to reduce the greenhouse effect, and to make the carbon dioxide reduction product pure and reusable, has become an important task to be solved by this project. one of the topics.

The technical problem to be solved by this creation is to provide a carbon dioxide electrolysis device in view of the deficiencies of the prior art.

In order to solve the above technical problems, one of the technical solutions adopted in this creation is to provide an electrolysis device for carbon dioxide. The carbon dioxide electrolysis device includes an electrochemical electrolysis device and an absorption unit. The electrochemical electrolysis device is used for electrolyzing a cathode reactant and an anode reactant to form a cathode mixture and an anode mixture, respectively. The cathode reactant includes carbon dioxide or a compound including bicarbonate or carbonate, and the cathode mixture includes carbon monoxide and hydrogen. An absorption unit is in fluid communication with the electrochemical electrolysis device, the absorption unit is for processing the cathode mixture to separate a synthesis gas including the carbon monoxide and the hydrogen.

In some embodiments, the carbon dioxide electrolysis device further comprises: a first reactant preparation unit, the first reactant preparation unit is in fluid communication between the electrochemical electrolysis device and the absorption unit. The absorption unit is used to separate the cathode mixture into a cathode gas product including the synthesis gas and a reflux liquid, and the first reactant preparation unit is used to receive the reflux liquid , and provide the cathode reactant to the electrochemical electrolysis device.

In some embodiments, the carbon dioxide electrolysis device further comprises: a first gas-liquid separation unit, the first gas-liquid separation unit is in fluid communication between the electrochemical electrolysis device and the absorption unit; wherein, the The first gas-liquid separation unit is used to separate the cathode mixture into a cathode gas mixture and a cathode liquid mixture, and the absorption unit is used to process the cathode gas mixture.

In some embodiments, the electrolysis device for carbon dioxide further comprises: a first liquid a gas treatment unit, the first liquid treatment unit is in fluid communication with the electrochemical electrolysis device; wherein the cathode mixture comprises a cathode gas mixture and a cathode liquid mixture, the first liquid treatment unit is used to treat the The cathode liquid mixture is produced to produce a first treatment liquid, and the first treatment liquid is returned to the electrochemical electrolysis device.

In some embodiments, the carbon dioxide electrolysis device further comprises: a first reactant preparation unit, the first reactant preparation unit is in fluid communication between the electrochemical electrolysis device and the first liquid processing unit; wherein , the first reactant preparation unit is used to receive the first treatment solution and provide the cathode reactant to the electrochemical electrolysis device.

In some embodiments, the carbon dioxide electrolysis device further comprises: a second gas-liquid separation unit, the second gas-liquid separation unit is in fluid communication with the electrochemical electrolysis device; wherein the second gas-liquid separation unit is a for separating the anode mixture into an anode gas mixture and an anode liquid mixture.

In some embodiments, the carbon dioxide electrolysis apparatus further comprises: a second liquid treatment unit in fluid communication with the electrochemical electrolysis device; wherein the anode mixture includes an anode gas mixture and a An anode liquid mixture, the second liquid treatment unit is used for processing the anode liquid mixture to generate a second treatment liquid, and returning the second treatment liquid to the electrochemical electrolysis device.

In some embodiments, the carbon dioxide electrolysis device further comprises: a second reactant preparation unit, the second reactant preparation unit is in fluid communication between the electrochemical electrolysis device and the second liquid processing unit; wherein , the second reactant preparation unit is used to receive the second treatment solution and provide the anode reactant to the electrochemical electrolysis device.

In some embodiments, the electrochemical electrolysis apparatus includes a plurality of electrolysis cells; wherein each of the electrolysis cells includes a cathode electrode located in a cathode chamber, an anode electrode located in an anode chamber, and an anode electrode located in an anode chamber. An ionic exchange between the cathode electrode and the anode electrode Change the membrane.

In some embodiments, the cathode chamber has an inlet for receiving the cathode reactant and an outlet for discharging the cathode mixture, and the anode chamber has an inlet for receiving the anode reactant. an inlet and an outlet for discharging the anode mixture.

In some embodiments, the cathode chamber has an inlet for receiving the cathode reactant and two outlets for discharging the cathode mixture, the anode chamber has an inlet for receiving the anode reactant and two outlets for discharging the anode mixture.

One of the beneficial effects of the present creation is that the carbon dioxide electrolysis device provided by the present creation can pass through the "electrochemical electrolysis device for electrolyzing cathode reactants and anode reactants" and "for processing the absorption of the cathode mixture" Unit" technical solution to achieve the effect of decomposing carbon dioxide to generate syngas.

In order to further understand the features and technical content of this creation, please refer to the following detailed descriptions and drawings about this creation, however, the provided drawings are only for reference and description, and are not intended to limit this creation.

1: Electrochemical electrolysis equipment

2: The first reactant preparation unit

3: The second reactant preparation unit

4: The first gas-liquid separation unit

5: Second gas-liquid separation unit

6: Absorption unit

7: The first liquid handling unit

8: Second Liquid Handling Unit

A1: Cathode reactant

A2: Anode reactant

B1: Cathode mix

B2: Anode mix

E1: Catholyte

E2: Anolyte

V1: Cathode Gas Mixture

V2: Anode gas mixture

L1: Cathode Liquid Mixture

L2: Anode liquid mixture

P1: Cathode gas product

R1: Reflux

R1*: The first treatment liquid

R2*: The second treatment liquid

10: Electrolysis unit

11: Cathode chamber

111: Entrance

112, 112A, 112B: Exit

12: Anode chamber

121: Entrance

122, 122A, 122B: Export

13: Insulation board

14: Cathode electrode

141: Cathode catalyst

15: Anode electrode

151: Anode catalyst

20: Ion exchange membrane

FIG. 1 is a functional block diagram of a carbon dioxide electrolysis device according to a first embodiment of the invention.

FIG. 2 is a three-dimensional schematic diagram of the created electrochemical electrolysis device.

FIG. 3 is a schematic side sectional view of the electrochemical electrolysis device according to the first embodiment of the invention.

FIG. 4 is a functional block diagram of a carbon dioxide electrolysis device according to a second embodiment of the invention.

FIG. 5 is a functional block diagram of a carbon dioxide electrolysis device according to a third embodiment of the invention.

FIG. 6 is a schematic side cross-sectional view of an electrochemical electrolysis device according to a third embodiment of the invention.

FIG. 7 is a functional block diagram of a carbon dioxide electrolysis device according to a fourth embodiment of the invention.

The following are specific specific examples to illustrate the embodiments of the "carbon dioxide electrolysis device" disclosed in the present creation, and those skilled in the art can understand the advantages and effects of the present creation from the content disclosed in this specification. This creation can be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of this creation. In addition, the drawings of this creation are only for simple schematic illustration, and are not drawn according to the actual size, and are stated in advance. The following embodiments will further describe the related technical contents of the present creation in detail, but the disclosed contents are not intended to limit the protection scope of the present creation. In addition, the term "or", as used herein, should include any one or a combination of more of the associated listed items, as the case may be.

The present invention provides an electrolysis device for carbon dioxide, which includes an electrochemical electrolysis device and an absorption unit in fluid communication. Electrochemical electrolysis equipment is used to reduce carbon dioxide, in order to achieve the effect of alleviating the greenhouse effect problem, and can simultaneously produce alkaline liquid products with commercial use. The absorption unit is used to separate carbon dioxide and carbon dioxide reduction products to obtain high-content synthesis gas (mixed gas of carbon monoxide and hydrogen), which can be used directly as fuel or as a basic raw material for other chemicals. In addition to synthesis gas, the gas-phase products produced by the cathode may include methane, ethane, ethylene, or mixtures thereof, but are still dominated by synthesis gas.

The electrochemical electrolysis device of the present invention can electrolyze a cathode reactant and an anode reactant, and form a cathode mixture and an anode mixture respectively. The cathode reactant includes carbon dioxide gas and a catholyte, and the anode reactant includes an anolyte.

Since the carbon dioxide gas is introduced into the cathode, the problem of low carbon dioxide conversion rate and unstable electrolysis reaction caused by the slow diffusion speed of carbon dioxide in the aqueous solution will not occur. Also, the cathode mixture produced by the electrolysis reaction includes a high content of synthesis gas, which can be used directly as a fuel. Then through the use of the absorption unit, the unelectrolyzed in the cathode mixture can be absorbed. carbon dioxide to further obtain high-purity synthesis gas.

It can be seen that the carbon dioxide electrolysis device of this creation can convert carbon dioxide into carbon monoxide and hydrogen at the cathode, which can not only decompose the greenhouse gas (carbon dioxide), but also generate synthetic gas (carbon monoxide and hydrogen) that can be used as fuel. Due to the high concentration of synthesis gas, it can be directly used as fuel or basic raw material for other chemicals without complicated separation or purification steps. In other embodiments, the cathode reactant may also be a compound containing bicarbonate or carbonate.

The aforesaid catholyte can contain sodium hydroxide, sodium bromide, sodium bicarbonate, sodium sulfate, sodium phosphate, sodium hydrogen phosphate, lithium hydroxide, lithium bromide, lithium bicarbonate, lithium sulfate, lithium phosphate, lithium hydrogen phosphate, An aqueous solution of an electrolyte of potassium hydroxide, potassium bromide, potassium bicarbonate, potassium sulfate, potassium phosphate, potassium hydrogen phosphate, or any combination thereof. In a preferred embodiment, the catholyte contains bicarbonate or carbonate, preferably, the catholyte is an aqueous solution containing sodium bicarbonate.

Aforesaid anolyte can contain sodium hydroxide, sodium bromide, sodium bicarbonate, sodium sulfate, sodium phosphate, sodium hydrogen phosphate, lithium hydroxide, lithium bromide, lithium bicarbonate, lithium sulfate, lithium phosphate, lithium hydrogen phosphate, An aqueous solution of an electrolyte of potassium hydroxide, potassium bromide, potassium bicarbonate, potassium sulfate, potassium phosphate, potassium hydrogen phosphate, or any combination thereof. In a preferred embodiment, the anolyte contains chloride ions (especially salts containing chloride ions). Preferably, the anolyte is an aqueous solution containing sodium chloride.

Different electrolyte compositions will lead to different electrolytic half-reactions, resulting in different cathode mixtures and anode mixtures. The following examples illustrate, but this creation is not limited to this.

When the catholyte is an aqueous solution containing sodium bicarbonate and the anolyte is an aqueous solution containing sodium bicarbonate, the half-reaction of the cathode reactants at the cathode is: CO _2(g) +H ₂ O+2e ^- →CO _(g) +2OH ^- and 2H ₂ O+2e ^- →H ₂ +2OH ^- ; the half reaction of the anode reactant at the anode is: 2H ₂ O→O ₂ +4H ⁺ +4e ^- . After electrolysis, the cathode mixture will contain the carbon monoxide and hydrogen produced by the electrolysis reaction and the catholyte. The anode mixture includes the oxygen produced by electrolysis and the anolyte.

When the catholyte is an aqueous solution containing sodium bicarbonate and the anolyte is an aqueous solution containing sodium chloride, the half-reaction of the cathode reactants at the cathode is: CO _2(g) +H ₂ O+2e ^- →CO _(g) +2OH ^- , 2H ₂ O+2e ^- →H ₂ +2OH ^- and Na ⁺ +OH ^- →NaOH; the half-reaction of the anode reactant at the anode is: 2Cl ^- →Cl ₂ +2e ^- . After electrolysis, the cathode mixture contains carbon monoxide and hydrogen produced by the electrolysis reaction, liquid sodium hydroxide, and a catholyte. The anode mixture includes chlorine gas from electrolysis and anolyte.

In a preferred embodiment, the aforementioned aqueous solution containing sodium bicarbonate can be formed by dissolving carbon dioxide into an aqueous sodium hydroxide solution. In addition, the concentration of the electrolyte in the catholyte is at least 0.001M, and the highest is the saturated concentration of the electrolyte, and the concentration of the electrolyte in the anolyte is at least 0.001M, and the highest is the saturated concentration of the electrolyte.

[First Embodiment]

Referring to FIG. 1, the first embodiment of the present invention provides a carbon dioxide electrolysis device, which includes: an electrochemical electrolysis device 1, a first reactant preparation unit 2, a second reactant preparation unit 3, a first reactant preparation unit 3, and a first reactant preparation unit 3. Gas-liquid separation unit 4 , a second gas-liquid separation unit 5 and absorption unit 6 .

The electrochemical electrolysis device 1 is in fluid communication with the first reactant preparation unit 2 to receive the cathode reactant A1 provided by the first reactant preparation unit 2 . The electrochemical electrolysis apparatus 1 is in fluid communication with the second reactant preparation unit 3 to receive the anode reactant A2 provided by the second reactant preparation unit 3 . The electrochemical electrolysis apparatus 1 electrolyzes the cathode reactant A1 and the anode reactant A2, and forms a cathode mixture B1 and an anode mixture B2, respectively. The cathode reactant A1 is prepared by the first reactant preparation unit 2 after receiving the catholyte E1 and carbon dioxide (CO ₂ ) gas, and the anode reactant A2 is prepared by the second reactant preparation unit 3 after receiving the anolyte E2. made.

The electrochemical electrolysis apparatus 1 is in fluid communication with the first gas-liquid separation unit 4 to separate the gas-phase and liquid-phase components in the cathode mixture B1. The cathode mixture B1 can be separated by the first gas-liquid separation unit 4 A cathode gas mixture V1 and a cathode liquid mixture L1 are distinguished. Specifically, the cathode gas mixture V1 includes carbon dioxide, carbon monoxide and hydrogen. Catholyte liquid mixture L1 contains catholyte E1; alternatively, cathode liquid mixture L1 contains liquid sodium hydroxide and catholyte E1, that is, catholyte mixture L1 contains metal ions, hydroxide ions or metal hydroxides thing. It can be seen from this that the carbon dioxide electrolysis device of the present invention can simultaneously generate the cathode gas mixture V1 and the cathode liquid mixture L1 with economic value.

The electrochemical electrolysis apparatus 1 is in fluid communication with a second gas-liquid separation unit 5 to separate the gas-phase and liquid-phase components in the anode mixture B2. The anode mixture B2 can be divided into an anode gas mixture V2 and an anode liquid mixture L2 by the second gas-liquid separation unit 5 . Specifically, the anode gas mixture V2 includes oxygen or chlorine gas, and the anode liquid mixture L2 includes anolyte E2.

The absorption unit 6 is in fluid communication with the first gas-liquid separation unit 4 to process the cathode gas mixture V1, and the absorption unit 6 absorbs carbon dioxide in the cathode gas mixture V1 to separate out carbon monoxide and hydrogen. Specifically, the catholyte solution E1 is passed into the absorption unit 6, and the catholyte solution E1 is brought into contact with the cathode gas mixture V1. At this time, carbon dioxide will be dissolved in the catholyte solution E1 from the cathode gas mixture V1.

After the cathode gas mixture V1 is contacted with the catholyte E1, a cathode gas product P1 and a reflux solution R1 are formed. Cathode gas product P1 includes carbon monoxide and hydrogen. The reflux solution R1 contains catholyte solution E1 and carbon dioxide; or, the reflux solution R1 includes catholyte solution E1, liquid sodium hydroxide (or generally referred to as liquid alkali) and carbon dioxide.

Therefore, the reflux liquid R1 can be returned to the electrochemical electrolysis device 1 and reused as the cathode reactant A1. In a preferred embodiment, the reflux liquid R1 is firstly delivered to the first reactant preparation unit 2 , and then delivered to the electrochemical electrolysis device 1 after being properly prepared. Specifically, the reflux liquid R1 contains bicarbonate, carbonate or hydroxide. It is worth noting that liquid sodium hydroxide reacts with carbon dioxide to form an aqueous sodium bicarbonate solution, which can be used as catholyte E1.

Please refer to FIG. 2 and FIG. 3 together, the electrochemical electrolysis device 1 of the present invention includes a plurality of electrolysis units 10 . In the first embodiment, a plurality of electrolysis units 10 are arranged in series, and an insulating plate 13 is spaced between every two adjacent electrolysis units 10 . In some embodiments, the number of electrolysis units 10 is 3 to 30.

It should be noted that the electrolysis units 10 arranged in series are illustrated in FIG. 2 , but the practical application is not limited to this, and a plurality of electrolysis units 10 may also be arranged in parallel. For example, a plurality of electrolysis units 10 can be arranged in series to form an electrolysis module, and then a plurality of electrolysis modules can be connected in parallel to form an electrolysis module, so as to increase the processing capacity of carbon dioxide gas and/or Increase the concentration of cathode gas product P1.

Please refer to FIG. 2 and FIG. 3 together. Each electrolysis unit 10 includes a cathode electrode 14 located in a cathode chamber 11 , an anode electrode 15 located in an anode chamber 12 , and an anode electrode 15 sandwiched between the cathode electrode 14 and the anode electrode. 15 between an ion exchange membrane 20.

Each cathode chamber 11 is formed with an inlet 111 on an inlet side to receive the cathode reactant A1, each cathode chamber 11 is formed with an outlet 112 on an outlet side to discharge the cathode mixture B1, and the inlet side and the outlet are sides are opposite each other. Each anode chamber 12 is formed with an inlet 121 on an inlet side to receive anode reactant A2, each anode chamber 12 is formed with an outlet 122 on an outlet side to discharge anode mixture B2, and the inlet side and outlet sides are opposite each other.

In some embodiments, the inlets 111 of each cathode chamber 11 are connected to each other by a pipeline for simultaneous injection of the cathode reactant A1, and the inlets 121 of each anode chamber 12 are connected to each other by another pipeline to simultaneously inject the anode reactant A2 . The inlet 111 of the cathode chamber 11 is not in communication with the inlet 121 of the anode chamber 12 . Similarly, the outlets 112 of the respective cathode chambers 11 are connected to each other by a pipeline, so that the electrolysis products produced by the respective electrolysis units 10 are merged to form the cathode mixture B1. The outlets 122 of the respective anode chambers 12 are connected to each other by another pipeline, so that the electrolysis products produced by the respective electrolysis units 10 are merged to form the anode mixture B2. The outlet 112 of the cathode chamber 11 does not communicate with the outlet 122 of the anode chamber 12 .

The inlets 111 and 121 may be formed at any position of the cathode chamber 11 or the anode chamber 12 , and generally speaking, the inlets 111 and 121 are formed at a position near the bottom of the cathode chamber 11 or the anode chamber 12 . Also, the positions of the outlets 112 and 122 are located at higher heights than the positions of the inlets 111 and 121 . For example, the inlets 111 and 121 can be formed at a position close to the bottom of the electrolysis unit 10 , and the outlets 112 and 122 can be formed at a position half or more of the height of the electrolysis unit 10 . However, this creation is not limited to this.

Referring to FIG. 3 , the cathode electrode 14 is disposed on the cathode chamber 11 , and a cathode catalyst 141 is formed on the cathode electrode 14 on a plane facing the ion exchange membrane 20 to promote the reduction reaction. The other plane of the cathode electrode 14 is located within the cathode chamber 11 and is in contact with the cathode reactant A1. The anode electrode 15 is disposed on the anode chamber 12, and an anode catalyst 151 is formed on a plane of the anode electrode 15 facing the ion exchange membrane 20, so as to promote the occurrence of oxidation reaction. The other plane of the anode electrode 15 is located within the anode chamber 12 and is in contact with the anode reactant A2. An external power source can apply electrical energy to the cathode electrode 14 and the anode electrode 15 for electrolysis.

In order to prevent the cathode electrodes 14 of the electrolysis cells 10 from contacting the anode electrodes 15 of the adjacent electrolysis cells 10 , insulating plates 13 are provided between the adjacent electrolysis cells 10 to completely separate them. In this way, when a voltage is externally applied to the cathode electrode 14 and the anode electrode 15 , it can be ensured that the cathode electrode 14 will not be in contact with the anode electrode 15 to avoid the occurrence of a short circuit.

In the present invention, the cathode electrode 14 may be a dense mesh structure, and the material forming the cathode electrode 14 may be a conductive material, such as metal or carbon material. The anode electrode 15 may be a dense mesh structure, and the material forming the anode electrode 15 may be a conductive material, such as metal or carbon material.

The cathode catalyst 141 may be various metals, metal compounds, alloys, carbon compounds containing at least one of heteroatoms or metals, or any combination thereof. Metals can be vanadium, chromium, manganese, iron, cobalt, nickel, copper, tin, zirconium, niobium, molybdenum, ruthenium, rhodium, palladium, silver, cadmium, hafnium, tantalum, tungsten, rhenium, iridium, platinum, gold, aluminum , indium, titanium, lead, bismuth, antimony, tellurium, lanthanum, cerium, neodymium or combinations thereof. Metal Compound Pack It includes organometallic compounds and inorganic metal compounds, and includes metal halides, metal oxides, and metal hydroxides. The carbon compound containing at least one of heteroatoms or metals may be a structure composed of nitrogen-containing graphite, nitrogen-containing graphene, or nitrogen-containing carbon tubes and metal atoms.

The anode catalyst 151 may be various metals, metal compounds, alloys, carbon compounds containing at least one of heteroatoms or metals, or any combination thereof. Metals can be vanadium, chromium, manganese, iron, cobalt, nickel, copper, tin, zirconium, niobium, molybdenum, ruthenium, rhodium, palladium, silver, cadmium, hafnium, tantalum, tungsten, rhenium, iridium, platinum, gold, aluminum , indium, titanium, lead, bismuth, antimony, tellurium, lanthanum, cerium, neodymium or combinations thereof. Metal compounds include organometallic compounds and inorganic metal compounds, and encompass metal halides, metal oxides, and metal hydroxides. The carbon compound containing at least one of heteroatoms or metals may be a structure composed of nitrogen-containing graphite, nitrogen-containing graphene, or nitrogen-containing carbon tubes and metal atoms.

The thickness of the ion exchange membrane 20 is 10 micrometers to 5000 micrometers, and the ion exchange membrane 20 can be a cation exchange membrane, for example, comprising polyvinylsulfonic acid, fullerene cross-linked polysulfonic acid, polyacrylic acid or perfluoroethanedisulfonic acid Alternatively, the ion exchange membrane 20 may be an anion exchange membrane, such as an anion exchange membrane comprising polystyrene methyl trimethyl ammonium chloride or polyether.

[Second Embodiment]

Referring to FIG. 4 , a second embodiment of the present invention provides a carbon dioxide electrolysis device, which is similar to the carbon dioxide electrolysis device of the first embodiment, and the main difference is that the carbon dioxide electrolysis device of the second embodiment further includes a first A liquid processing unit 7 and a second liquid processing unit 8 .

The first liquid processing unit 7 is in fluid communication with the first gas-liquid separation unit 4 to receive and properly process the cathode liquid mixture L1. The catholyte liquid mixture L1 can be processed by the first liquid treatment unit 7 to form a first treatment liquid R1*. The main component of the first treatment liquid R1* is the catholyte E1. Therefore, the first treatment liquid R1* can be refluxed to The electrochemical electrolysis device 1 is reused as the cathode reactant A1. In a preferred embodiment, the first treatment liquid R1* can be sent to the first reactant preparation unit 2, After appropriate preparation, it is sent to the electrochemical electrolysis device 1 . Specifically, the reflux liquid R1* contains bicarbonate, carbonate or hydroxide.

The second liquid processing unit 8 is in fluid communication with the second gas-liquid separation unit 5 to receive and properly process the anode liquid mixture L2. After the anode liquid mixture L2 is processed by the second liquid treatment unit 8, a second treatment liquid R2* can be formed. The main component of the second treatment liquid R2* is the anolyte E2. Therefore, the second treatment liquid R2* can be refluxed to The electrochemical electrolysis device 1 is reused as the anode reactant A2. In a preferred embodiment, the second treatment solution R2* can be firstly delivered to the second reactant preparation unit 3, and then delivered to the electrochemical electrolysis device 1 after being properly prepared.

[Third Embodiment]

Please refer to FIG. 5 and FIG. 6 together, a third embodiment of the present invention provides a carbon dioxide electrolysis device, which is similar to the carbon dioxide electrolysis device of the first embodiment, and the main difference is: the carbon dioxide electrolysis device of the third embodiment The first gas-liquid separation unit 4 and the second gas-liquid separation unit 5 are not included.

Referring to FIG. 6 , in the third embodiment, each cathode chamber 11 has two outlets 112A, 112B, and the two outlets 112A, 112B are formed at different height positions. The higher-level outlet 112A may be used to discharge the cathode gas mixture V1, while the lower-level outlet 112B may be used to discharge the cathode liquid mixture L1. Each anode chamber 12 has two outlets 112A, 112B, and the two outlets 112A, 112B are formed at different height positions. The higher-level outlet 122A may be used to discharge the anode gas mixture V2, while the lower-level outlet 122B may be used to discharge the anode liquid mixture L2. In this way, the use of the first liquid processing unit 7 and the second liquid processing unit 8 can be omitted.

It is worth noting that when the carbon dioxide electrolysis device of the third embodiment is in use, it is necessary to maintain the liquid level in the cathode chamber 11 and the anode chamber 12 to be half full or more than half full, so as to distinguish the cathode gas mixture V1. Mixing with cathode liquid mixture L1, and distinguishing anode gas The effect of compound V2 and anode liquid mixture L2.

Except for the first gas-liquid separation unit 4 and the second gas-liquid separation unit 5, the electrolysis device for carbon dioxide in the third embodiment has the same electrochemical electrolysis device 1, the first reaction as the electrolysis device for carbon dioxide in the first embodiment. The compound preparation unit 2, the second reactant preparation unit 3 and the absorption unit 6 are not described here.

[Fourth Embodiment]

Referring to FIG. 7 , a fourth embodiment of the present invention provides a carbon dioxide electrolysis device, which is similar to the carbon dioxide electrolysis device of the third embodiment, and the main difference is that the carbon dioxide electrolysis device of the fourth embodiment further comprises a first Liquid processing unit 7 and second liquid processing unit 8 .

The first liquid processing unit 7 is in fluid communication with the electrochemical electrolysis device 1 to receive and properly process the cathodic liquid mixture L1. The catholyte liquid mixture L1 can be processed by the first liquid treatment unit 7 to form a first treatment liquid R1*. The main component of the first treatment liquid R1* is the catholyte E1. Therefore, the first treatment liquid R1* can be refluxed to The electrochemical electrolysis device 1 is reused as the cathode reactant A1. In a preferred embodiment, the first treatment solution R1* can be firstly delivered to the first reactant preparation unit 2, and then delivered to the electrochemical electrolysis device 1 after being properly prepared.

The second liquid processing unit 8 is in fluid communication with the electrochemical electrolysis device 1 to receive and properly process the anode liquid mixture L2. After the anode liquid mixture L2 is processed by the second liquid treatment unit 8, a second treatment liquid R2* can be formed. The main component of the second treatment liquid R2* is the anolyte E2. Therefore, the second treatment liquid R2* can be refluxed to The electrochemical electrolysis device 1 is reused as the anode reactant A2. In a preferred embodiment, the second treatment solution R2* can be firstly delivered to the second reactant preparation unit 3, and then delivered to the electrochemical electrolysis device 1 after being properly prepared.

When the carbon dioxide electrolysis device of the present invention is in use, the following steps may be included: electrolyzing the cathode reactant and the anode reactant using an electrochemical electrolysis device to form a cathode mixture and an anode reactant, respectively. Anode mixture (first step); treatment of cathode mixture with absorption unit to separate cathode mixture into cathode gas product and reflux (second step); delivery of reflux to first reactant preparation unit (third step); first After receiving the reflux liquid, the reactant preparation unit provides the cathode reactant to the electrochemical electrolysis device (fourth step).

In the first step, the cathode reactants include carbon dioxide gas and a catholyte, and the anode reactants include an anolyte. The cathode mixture includes carbon monoxide, hydrogen, and catholyte (or carbon monoxide, hydrogen, liquid sodium hydroxide, and catholyte) produced by electrolysis. The anode mixture includes oxygen and anolyte (or includes chlorine and anolyte).

In the second step, the cathode gas product includes carbon monoxide and hydrogen, ie, synthesis gas. The reflux liquid includes catholyte and carbon dioxide (or includes catholyte, liquid sodium hydroxide and carbon dioxide), so it can be returned to the electrochemical electrolysis equipment through the third to fourth steps, so as to improve the carbon dioxide in the electrolysis method of carbon dioxide. Conversion rate. According to the above method, this creation can convert carbon dioxide into synthetic gas that can be used as a fuel, which not only alleviates the problem of the greenhouse effect, but also provides renewable energy.

[Advantageous effects of the embodiment]

One of the beneficial effects of the present creation is that the carbon dioxide electrolysis device provided by the present creation can pass through the "electrochemical electrolysis device for electrolyzing cathode reactants and anode reactants" and "for processing the absorption of the cathode mixture" Unit" technical solution to achieve the effect of decomposing carbon dioxide to generate syngas.

Furthermore, the carbon dioxide electrolysis device of the present creation improves the cathode gas product through the technical solution of "the absorption unit is used to distinguish the cathode mixture into cathode gas product and reflux liquid, and the cathode gas product includes the synthesis gas". content of synthesis gas.

The contents disclosed above are only preferred and feasible embodiments of the present creation, and are not The scope of the patent application of this creation is limited, so all equivalent technical changes made by using the contents of the description and drawings of this creation are included in the scope of the patent application of this creation.

1: Electrochemical electrolysis equipment

2: The first reactant preparation unit

3: The second reactant preparation unit

4: The first gas-liquid separation unit

5: Second gas-liquid separation unit

6: Absorption unit

A1: Cathode reactant

A2: Anode reactant

B1: Cathode mix

B2: Anode mix

E1: Catholyte

E2: Anolyte

V1: Cathode Gas Mixture

V2: Anode gas mixture

L1: Cathode Liquid Mixture

L2: Anode liquid mixture

P1: Cathode gas product

R1: Reflux

Claims (11)

A carbon dioxide electrolysis device, comprising: An electrochemical electrolysis device for electrolyzing a cathode reactant and an anode reactant to form a cathode mixture and an anode mixture, respectively; wherein the cathode reactant comprises carbon dioxide or bicarbonate or carbonate compound, the cathode mixture includes carbon monoxide and hydrogen; and An absorption unit, in fluid communication with the electrochemical electrolysis device, is used to process the cathode mixture to separate a synthesis gas including the carbon monoxide and the hydrogen. The carbon dioxide electrolysis device according to claim 1, further comprising: a first reactant preparation unit, the first reactant preparation unit being in fluid communication between the electrochemical electrolysis equipment and the absorption unit; wherein, The absorption unit is used to separate the cathode mixture into a cathode gas product including the synthesis gas and a reflux liquid, and the first reactant preparation unit is used to receive the reflux liquid , and provide the cathode reactant to the electrochemical electrolysis device. The carbon dioxide electrolysis device according to claim 1, further comprising: a first gas-liquid separation unit, the first gas-liquid separation unit is in fluid communication between the electrochemical electrolysis equipment and the absorption unit; wherein, The first gas-liquid separation unit is used to separate the cathode mixture into a cathode gas mixture and a cathode liquid mixture, and the absorption unit is used to process the cathode gas mixture. The carbon dioxide electrolysis device of claim 1, further comprising: a first liquid treatment unit in fluid communication with the electrochemical electrolysis device; wherein the cathode mixture comprises a cathode gas mixture With a cathode liquid mixture, the first liquid treatment unit is used to process the cathode liquid mixture to produce a first treatment liquid, and return the first treatment liquid to the electrochemical electrolysis device. The carbon dioxide electrolysis device according to claim 4, further comprising: a first reactant preparation unit, the first reactant preparation unit being in fluid communication between the electrochemical electrolysis device and the first liquid processing unit ; wherein, the first reactant preparation unit is used to receive the first treatment solution and provide the cathode reactant to the electrochemical electrolysis device. The carbon dioxide electrolysis device according to claim 1, further comprising: a second gas-liquid separation unit, the second gas-liquid separation unit is in fluid communication with the electrochemical electrolysis equipment; wherein, the second gas-liquid separation unit Cells are used to separate the anode mixture into an anode gas mixture and an anode liquid mixture. The carbon dioxide electrolysis device of claim 1, further comprising: a second liquid treatment unit in fluid communication with the electrochemical electrolysis device; wherein the anode mixture comprises an anode gas mixture With an anode liquid mixture, the second liquid treatment unit is used to process the anode liquid mixture to produce a second treatment liquid and return the second treatment liquid to the electrochemical electrolysis device. The carbon dioxide electrolysis device according to claim 7, further comprising: a second reactant preparation unit, the second reactant preparation unit being in fluid communication between the electrochemical electrolysis device and the second liquid processing unit ; wherein, the second reactant preparation unit is used to receive the second treatment solution and provide the anode reactant to the electrochemical electrolysis device. The carbon dioxide electrolysis device according to claim 1, wherein the electrochemical electrolysis device includes a plurality of electrolysis units; wherein each of the electrolysis units includes a cathode electrode located in a cathode chamber, and a cathode electrode located in an anode chamber. an anode electrode and an ion exchange membrane sandwiched between the cathode electrode and the anode electrode. The carbon dioxide electrolysis device of claim 9, wherein the cathode chamber has an inlet for receiving the cathode reactant and an outlet for discharging the cathode mixture, and the anode chamber has an inlet for receiving the cathode reactant and an outlet for discharging the cathode mixture. An inlet to receive the anode reactant and an outlet to discharge the anode mixture. The carbon dioxide electrolysis device of claim 9, wherein the cathode chamber has an inlet for receiving the cathode reactant and two outlets for discharging the cathode mixture, and the anode chamber has One inlet to receive the anode reactant and two outlets to discharge the anode mixture.

Images