Synthetic chemical product production system

Abstract

The present invention provides a synthetic chemical product production system comprising: a prescribed voltage current control device 1; a water electrolysis device to which electric power is supplied from the voltage current control device 1 and which generates H2; a prescribed voltage current control device 2; a CO2 electrolysis device which generates CO; a detection device which detects the ratio between the amounts of CO and a by-product H2 that have been generated by the CO2 electrolysis device; a synthetic chemical product production device which, via a catalyst reaction, produces a synthetic chemical product with H2 that has been generated by the water electrolysis device and CO and H2 that have been generated by the CO2 electrolysis device; and a control device which controls, in accordance with the ratio, at least one of the amount of H2 that is supplied from the water electrolysis device to the synthetic chemical product production device and the amounts of CO and the by-product H2 that are supplied from the CO2 electrolysis device to the synthetic chemical product production device. The present invention can provide a synthetic chemical product production system which makes it possible to highly accurately control an H2 / CO ratio in accordance with a desired synthetic chemical product.

Description

Synthetic Chemical Manufacturing System

[0001] The technology of this disclosure relates to synthetic chemical manufacturing systems.

[0002] Technologies for producing synthetic chemical products using electricity derived from renewable energy sources and combining electrolysis technology with Fischer-Tropsch (FT) synthesis or methanol synthesis have been attracting attention. For example, Patent Literature 1 discloses a methanol synthesis system that uses renewable energy, a steam electrolysis device, and a carbon dioxide electrolysis device to synthesize methanol.

[0003] FT synthesis and methanol synthesis are catalytic reactions, and H ２ On the other hand, when renewable energy is used as the energy source for the electrolysis reaction, the power supply fluctuates depending on the weather. ２ In the case of electrolysis, the target product is CO, but the rate of CO production changes depending on the input electrical energy, and the side reaction H ２ When producing synthesis gas, CO ２ Both electrolysis and water electrolysis equipment were prepared, and the outlet gases of each were CO and H ２ However, when the above phenomenon occurs, CO ２ H from the electrolysis outlet ２ As a result, the H in the synthesis gas after mixing ２ There was a possibility that the problem of the CO / CO ratio becoming more variable could arise.

[0004] In addition, in Patent Document 2, H in the electrolyte ２ O and CO ２ Electrolyze to produce H ２ In an electrolysis device capable of generating a raw material gas containing H and CO, ２ The initial CO and CO mixture ratio was adjusted in advance to the target mixture ratio. ２ It has been considered to carry out electrolysis at high concentrations.

[0005] JP 2017-178810 A Japanese Patent No. 5787034 A

[0006] However, the method described in Patent Document 1 uses an electrolysis device equipped with a solid oxide electrolysis cell, which requires a high temperature of approximately 800°C to 900°C (see paragraph

[0032] of Patent Document 1). This is because it is necessary to develop the ionic conductivity of the oxide electrolyte. To maintain such a high temperature state, stable power is required, and electricity from variable power sources such as solar power generation and wind power generation cannot provide sufficient H ２ The generation of CO was very unstable. ２ In the method described in Patent Document 2, only CO is generated from H in the raw material gas. ２ The initial CO and CO mixture ratio is adjusted to the target mixture ratio. ２ The concentration is pre-adjusted, but CO ２ Even if you adjust the density, ２ Furthermore, the H / CO ratio of the by-products increased over time, regardless of fluctuations in the power supply. ２ There is also the problem of increased generation of

[0007] Therefore, the technology of the present disclosure has been made in consideration of the above circumstances, and the object of the technology of the present disclosure is to provide a method for producing H with higher precision in accordance with a desired synthetic chemical product. ２ The present invention provides a synthetic chemical manufacturing system capable of controlling the CO / CO ratio.

[0008] The following embodiments are preferably applied: <1-1> A power generating device including a voltage / current control device 1 for controlling the voltage and current of power generated by power generation, a reduction electrode, an electrolyte, and an oxidation electrode, and receiving power from the voltage / current control device 1 to electrolyze water to produce H ２ a water electrolysis device that generates CO; a voltage / current control device 2 that controls the voltage and current of the power generated by the power generation; a reduction electrode, a polymer membrane, and an oxidation electrode, and is supplied with power from the voltage / current control device 2 and generates CO ２ CO is electrolyzed to produce CO ２ an electrolysis device; and ２ CO and by-product H produced in the electrolysis device ２ a detector for detecting the ratio of the amount of H generated in the water electrolysis device; ２, and the CO ２ CO and by-product H produced in the electrolysis device ２ a synthetic chemical manufacturing apparatus for manufacturing a synthetic chemical by a catalytic reaction based on the ratio; and a water electrolysis apparatus for supplying H to the synthetic chemical manufacturing apparatus according to the ratio. ２ and the CO ２ CO and by-product H from the electrolysis device to the synthetic chemical manufacturing device ２ and a control device for controlling at least one of the supply amounts of the voltage and current of the electric power generated by power generation. <1-2> A synthetic chemical manufacturing system comprising: a voltage and current control device 1 for controlling the voltage and current of the electric power generated by power generation; and a control device for controlling the supply amount of the voltage and current of the electric power generated by power generation; ２ a water electrolysis device that generates CO; a voltage / current control device 2 that controls the voltage and current of the power generated by the power generation; a reduction electrode, a polymer membrane, and an oxidation electrode, and is supplied with power from the voltage / current control device 2 and generates CO ２ CO is electrolyzed to produce CO ２ an electrolysis device; and ２ CO and by-product H produced in the electrolysis device ２ a detector for detecting the ratio of the amount of H generated in the water electrolysis device; ２ , and the CO ２ CO and by-product H produced in the electrolysis device ２ and a control device that sends a signal to the voltage and current control device 1 to control the power supply of the voltage and current control device 1 in accordance with the ratio. <1-3> A synthetic chemical production system comprising: a synthetic chemical production device that produces synthetic chemicals by a catalytic reaction based on the above ratio; and a control device that sends a signal to the voltage and current control device 1 to control the power supply of the voltage and current control device 1 in accordance with the ratio. <1-3> A synthetic chemical production system comprising: a voltage and current control device 1 that controls the voltage and current of power generated by power generation; and a control device that controls the voltage and current of power generated by power generation, the control device comprising a reduction electrode, an electrolyte, and an oxidation electrode, and that receives power from the voltage and current control device 1 and electrolyzes water to produce H ２ a water electrolysis device for generating H generated by the water electrolysis device; ２ a storage tank T1 for storing CO; a voltage / current control device 2 for controlling the voltage and current of the power generated by the power generation; and a CO ２CO is electrolyzed to produce CO ２ an electrolysis device; and ２ CO and by-product H produced in the electrolysis device ２ a storage tank T2 for storing CO and by-product H in the storage tank T2; ２ a detection device for detecting the ratio of the amount of H supplied from the storage tank T1; ２ , and CO and by-product H supplied from the storage tank T2 ２ a synthetic chemical manufacturing apparatus for manufacturing a synthetic chemical by a catalytic reaction based on the ratio; and a H ２ and the amount of CO and by-product H supplied from the storage tank T2 to the synthetic chemical manufacturing equipment. ２ and a control device for controlling at least one of the supply amounts of CO and by-product H in the storage tank T2. ２ H from the storage tank T1 according to the ratio of the amounts of ２ <1-5> The synthetic chemical manufacturing system according to <1-3>, which is capable of controlling the supply amount of electricity generated by power generation, includes a voltage / current control device 1 that controls the voltage and current of the electricity generated by power generation, a reduction electrode, an electrolyte, and an oxidation electrode, and is supplied with power from the voltage / current control device 1 to electrolyze water to produce H ２ a water electrolysis device that generates CO; a voltage / current control device 2 that controls the voltage and current of the power generated by the power generation; a reduction electrode, a polymer membrane, and an oxidation electrode, and is supplied with power from the voltage / current control device 2 and generates CO ２ CO is electrolyzed to produce CO ２ an electrolysis device; and H generated in the water electrolysis device. ２ , and the CO ２ CO and by-product H produced in the electrolysis device ２ a storage tank T for storing CO and H in the storage tank T; ２ a detection device for detecting the ratio of the amount of H supplied from the storage tank T; ２ , and CO and by-product H supplied from the storage tank T ２a synthetic chemical manufacturing apparatus for manufacturing synthetic chemicals by catalytic reaction based on the ratio; and a water electrolysis apparatus for transferring H from the water electrolysis apparatus to the storage tank T according to the ratio. ２ and the CO ２ CO and by-product H from the electrolysis device to the storage tank T ２ and a control device for controlling at least one of the supply amounts of the water electrolysis device and the CO 2 . <1-6> The synthetic chemical production system according to any one of <1-1> to <1-5>, wherein the power generation is power generation using renewable energy. <1-7> A synthetic chemical production system comprising: a water electrolysis device and a control device for controlling at least one of the supply amounts of the CO 2 . ２ The synthetic chemical production system according to any one of <1-1> to <1-6>, wherein at least one of the electrolysis devices further comprises a separator. <1-8> The synthetic chemical production system according to any one of <1-1> to <1-7>, wherein the electrolyte comprises at least one selected from the group consisting of an electrolytic solution, a polymer electrolyte membrane, and a solid electrolyte. <1-9> The synthetic chemical production system according to any one of <1-1> to <1-8>, wherein the polymer membrane is a polymer electrolyte membrane. <1-10> The synthetic chemical production system according to any one of <1-1> to <1-9>, wherein the catalytic synthesis reaction is selected from an alcohol synthesis reaction, a methanation reaction, a Fischer-Tropsch reaction, and an oxo synthesis reaction. <1-11> The CO ２ The amount of CO produced in the electrolysis device ２ By-product H produced in the electrolysis device ２ and H generated in the water electrolysis device ２ The ratio of the total amount (H ２ <1-12> The synthetic chemical production system according to any one of <1-1> to <1-11>, wherein the produced synthetic chemical product comprises at least one selected from the group consisting of methane, propane, butane, methanol, ethanol, dimethyl ether, gasoline, kerosene, jet fuel, light oil, heavy oil, naphtha, olefins, aromatic compounds, butadiene, and aldehydes.

[0009] The following embodiments are also preferably applied: <2-1> A fuel cell comprising a voltage / current control device 1 that controls the voltage and current of electricity generated by renewable energy generation, a separator, a reduction electrode, an electrolyte, and an oxidation electrode, and receiving power from the voltage / current control device 1, electrolyzing water to produce H ２ a water electrolysis device that generates CO; a voltage and current control device 2 that controls the voltage and current of the electricity generated by power generation using renewable energy; and a separator, a reduction electrode, a polymer electrolyte membrane, and an oxidation electrode. ２ CO is electrolyzed to produce CO ２ an electrolysis device; and ２ CO and by-product H produced from the electrolysis device ２ a detection device for detecting a ratio of the amount of H produced by the water electrolysis device; a control device for sending a signal to the voltage and current control device 1 to control the power supplied to the voltage and current control device 1 in accordance with the ratio; ２ , and the CO ２ CO and by-product H produced in the electrolysis device ２ and a synthetic chemical production system comprising: a voltage-current control device 1 that controls the voltage and current of electricity generated by power generation using renewable energy; and a separator, a reduction electrode, an electrolyte, and an oxidation electrode, which receives power from the voltage-current control device 1 and electrolyzes water to produce H ２ a water electrolysis device for generating H generated by the water electrolysis device; ２ a storage tank T1 for storing CO; a voltage and current control device 2 for controlling the voltage and current of the electricity generated by power generation using renewable energy; and a CO ２ CO is electrolyzed to produce CO ２ an electrolysis device; and ２ CO and by-product H produced from the electrolysis device ２ a storage tank T2 for storing CO and by-product H in the storage tank T2; ２a detection device for detecting a ratio of the amount of H from the storage tank T1 according to the ratio; ２ a control device for controlling the supply amount of H supplied from the storage tank T1; ２ , and CO and by-product H supplied from the storage tank T2 ２ A synthetic chemical manufacturing system comprising: a synthetic chemical manufacturing apparatus that manufactures synthetic chemicals by catalytic reactions based on the above;

[0010] According to the technology of the present disclosure, H ２ It is possible to provide a synthetic chemical manufacturing system capable of controlling the H2O / CO ratio.

[0011] Fig. 1 is a schematic diagram of a synthetic chemical product manufacturing system preferably used in a first embodiment of the present disclosure; Fig. 2 is a schematic diagram of a synthetic chemical product manufacturing system preferably used in a second embodiment of the present disclosure; Fig. 3 is a schematic diagram of a synthetic chemical product manufacturing system preferably used in a third embodiment of the present disclosure; Fig. 4 is a schematic diagram of a synthetic chemical product manufacturing system preferably used in a fourth embodiment of the present disclosure; Fig. 5 is a schematic diagram of a solid electrolyte electrolysis device preferably used in this embodiment;

[0012] The upper and lower limit values ​​of the numerical ranges described in this specification can be combined in any way. For example, when "A to B" and "C to D" are described as numerical ranges, the numerical ranges "A to D" and "C to B" are also included in the scope of the present disclosure. Furthermore, unless otherwise specified, a numerical range of "lower limit value to upper limit value" described in this specification means that the range is equal to or greater than the lower limit value and equal to or less than the upper limit value.

[0013] <Synthetic Chemical Product Manufacturing System> Synthetic chemical product manufacturing systems according to embodiments of the present disclosure include a synthetic chemical product manufacturing system according to a first embodiment of the present disclosure, a synthetic chemical product manufacturing system according to a second embodiment of the present disclosure, a synthetic chemical product manufacturing system according to a third embodiment of the present disclosure, and a synthetic chemical product manufacturing system according to a fourth embodiment of the present disclosure.

[0014] The synthetic chemical manufacturing system according to the first embodiment of the present disclosure includes a voltage / current control device 1 that controls the voltage and current of the power generated by power generation, a reduction electrode, an electrolyte, and an oxidation electrode, and receives power from the voltage / current control device 1 and electrolyzes water to produce H ２ a water electrolysis device that generates CO; a voltage / current control device 2 that controls the voltage and current of the power generated by the power generation; a reduction electrode, a polymer membrane, and an oxidation electrode, and is supplied with power from the voltage / current control device 2 and generates CO ２ CO is electrolyzed to produce CO ２ an electrolysis device; and ２ CO and by-product H produced in the electrolysis device ２ a detector for detecting the ratio of the amount of H generated in the water electrolysis device; ２ , and the CO ２ CO and by-product H produced in the electrolysis device ２ a synthetic chemical manufacturing apparatus for manufacturing a synthetic chemical by a catalytic reaction based on the ratio; and a water electrolysis apparatus for supplying H to the synthetic chemical manufacturing apparatus according to the ratio. ２ and the CO ２ CO and by-product H from the electrolysis device to the synthetic chemical manufacturing device ２ and a control device that controls at least one of the supply amounts of the above.

[0015] A synthetic chemical manufacturing system according to a second embodiment of the present disclosure includes a voltage / current control device 1 that controls the voltage and current of power generated by power generation, a reduction electrode, an electrolyte, and an oxidation electrode, and receives power from the voltage / current control device 1 and electrolyzes water to produce H ２ a water electrolysis device that generates CO; a voltage / current control device 2 that controls the voltage and current of the power generated by the power generation; a reduction electrode, a polymer membrane, and an oxidation electrode, and is supplied with power from the voltage / current control device 2 and generates CO ２ CO is electrolyzed to produce CO ２ an electrolysis device; and ２ CO and by-product H produced in the electrolysis device ２a detection device for detecting a ratio of the amount of H produced by the water electrolysis device; a control device for sending a signal to the voltage and current control device 1 to control the power supplied to the voltage and current control device 1 in accordance with the ratio; ２ , and the CO ２ CO and by-product H produced in the electrolysis device ２ and a synthetic chemical manufacturing apparatus for manufacturing synthetic chemicals by catalytic reactions based on the above.

[0016] A synthetic chemical manufacturing system according to a third embodiment of the present disclosure includes a voltage / current control device 1 that controls the voltage and current of power generated by power generation, a reduction electrode, an electrolyte, and an oxidation electrode, and receives power from the voltage / current control device 1 and electrolyzes water to produce H ２ a water electrolysis device for generating H generated by the water electrolysis device; ２ a storage tank T1 for storing CO; a voltage / current control device 2 for controlling the voltage and current of the power generated by the power generation; and a CO ２ CO is electrolyzed to produce CO ２ an electrolysis device; and ２ CO and by-product H produced in the electrolysis device ２ a storage tank T2 for storing CO and by-product H in the storage tank T2; ２ a detection device for detecting the ratio of the amount of H supplied from the storage tank T1; ２ , and CO and by-product H supplied from the storage tank T2 ２ a synthetic chemical manufacturing apparatus for manufacturing a synthetic chemical by a catalytic reaction based on the ratio; and a H ２ and the amount of CO and by-product H supplied from the storage tank T2 to the synthetic chemical manufacturing equipment. ２ and a control device that controls at least one of the supply amounts of the above.

[0017] A synthetic chemical manufacturing system according to a fourth embodiment of the present disclosure includes a voltage / current control device 1 that controls the voltage and current of power generated by power generation, a reduction electrode, an electrolyte, and an oxidation electrode, and receives power from the voltage / current control device 1 and electrolyzes water to produce H ２ a water electrolysis device that generates CO; a voltage / current control device 2 that controls the voltage and current of the power generated by the power generation; a reduction electrode, a polymer membrane, and an oxidation electrode, and is supplied with power from the voltage / current control device 2 and generates CO ２ CO is electrolyzed to produce CO ２ an electrolysis device; and H generated in the water electrolysis device. ２ , and the CO ２ CO and by-product H produced in the electrolysis device ２ a storage tank T for storing CO and H in the storage tank T; ２ a detection device for detecting a ratio of the amount of H from the water electrolysis device to the storage tank T in accordance with the ratio; ２ and the CO ２ CO and by-product H from the electrolysis device to the storage tank T ２ a control device for controlling at least one of the supply amounts of H supplied from the storage tank T; ２ , and CO and by-product H supplied from the storage tank T ２ and a synthetic chemical manufacturing apparatus for manufacturing synthetic chemicals by catalytic reactions based on the above.

[0018] Unless otherwise specified, the matters described below as "synthetic chemical production systems according to embodiments of the present disclosure" apply to the synthetic chemical production systems according to the first embodiment of the present disclosure, the synthetic chemical production systems according to the second embodiment of the present disclosure, the synthetic chemical production systems according to the third embodiment of the present disclosure, and the synthetic chemical production systems according to the fourth embodiment of the present disclosure. As described above, the synthetic chemical production systems according to embodiments of the present disclosure use a water electrolysis device and a CO ２ The electrolysis device also uses an electrolysis device that includes a reduction electrode, an electrolyte, and an oxidation electrode. ２ In the electrolysis device, a polymer membrane is used as the electrolyte.２ The electrolysis device does not need to be operated at high temperatures, and can be operated at temperatures below 100°C, and CO can be produced relatively stably even with electricity from variable power sources such as solar power generation and wind power generation. ２ At least one of the electrolysis devices preferably further comprises a separator. ２ The polymer membrane in the electrolysis device is preferably a polymer electrolyte membrane.

[0019] In the synthetic chemical manufacturing system according to the first embodiment of the present disclosure, CO ２ CO and by-product H produced in the electrolysis device ２ Depending on the ratio of the amount of H from the water electrolysis unit to the synthetic chemical manufacturing unit, ２ supply amount, and CO ２ CO and by-product H from electrolysis equipment to synthetic chemical manufacturing equipment ２ In this way, at least one of the supply amounts of CO ２ CO and by-product H produced in the electrolysis device ２ Depending on the ratio of the amount of H from the water electrolysis unit to the synthetic chemical manufacturing unit, ２ supply amount, and CO ２ CO and by-product H from electrolysis equipment to synthetic chemical manufacturing equipment ２ By controlling at least one of the supply amounts of H ２ The CO / CO ratio can be controlled.

[0020] In the synthetic chemical manufacturing system according to the second embodiment of the present disclosure, CO ２ CO and by-product H produced in the electrolysis device ２ The power supply of the voltage and current control device 1 is controlled in accordance with the ratio of the amounts of H generated in the water electrolysis device. ２ In this way, the amount of CO ２ CO and by-product H produced in the electrolysis device ２ The power supply of the voltage and current control device 1 is controlled in accordance with the ratio of the amounts of H generated in the water electrolysis device. ２ By adjusting the amount of ２ The CO / CO ratio can be controlled.

[0021] In the synthetic chemical manufacturing system according to the third embodiment of the present disclosure, CO and by-product H in the storage tank T2 ２ According to the ratio of the amount of H from the storage tank T1 to the synthetic chemical manufacturing plant ２ and the amount of CO and by-product H supplied from the storage tank T2 to the synthetic chemical manufacturing plant. ２ In this way, the amount of CO and by-product H in the storage tank T2 is controlled. ２ According to the ratio of the amount of H from the storage tank T1 to the synthetic chemical manufacturing plant ２ and the amount of CO and by-product H supplied from the storage tank T2 to the synthetic chemical manufacturing plant. ２ By controlling at least one of the supply amounts of H ２ The CO / CO ratio can be controlled.

[0022] In the synthetic chemical manufacturing system according to the fourth embodiment of the present disclosure, CO and H in the storage tank T ２ H from the water electrolysis device to the storage tank T according to the ratio of the amount of ２ supply amount, and CO ２ CO and by-product H from the electrolysis device to the storage tank T ２ In this way, the supply amount of CO and H in the storage tank T is controlled. ２ H from the water electrolysis device to the storage tank T according to the ratio of the amount of ２ supply amount, and CO ２ CO and by-product H from the electrolysis device to the storage tank T ２ By controlling at least one of the supply amounts of H ２ The CO / CO ratio can be controlled.

[0023] Appropriate H ２ The reason why it is not possible to control the CO / CO ratio is, for example, that the use of renewable energy makes the power supply unstable. ２ When a catalyst is used in the electrolysis device, deterioration of the catalyst over time can be cited as an example. Examples include deterioration of electrolysis components such as a polymer membrane, a gas diffusion layer, and an oxidation electrode over time, and changes in gas flow rate and pressure due to precipitation of electrolyte salt in the flow path. In particular, in the control method described in Patent Document 2,２ Even if the concentration is controlled, if the voltage and current cannot be controlled, the H ２ In contrast, in the synthetic chemical production system according to the first embodiment of the present disclosure, the H / CO ratio can be adjusted with higher accuracy than in the past. ２ Furthermore, in the synthetic chemical manufacturing system according to the second embodiment of the present disclosure used for electrolysis, the power supply to the voltage and current control device 1 can be controlled, so that the H / CO ratio can be controlled more accurately than before. ２ In the synthetic chemical production systems according to the third and fourth embodiments, as in the first and second embodiments, it is possible to control the H / CO ratio with higher accuracy than in the past. ２ The CO / CO ratio can be controlled.

[0024] Examples of synthetic chemicals that can be produced by the synthetic chemical production system according to the embodiment of the present disclosure include gaseous synthetic fuels, liquid synthetic fuels, and synthetic compounds other than synthetic fuels. Examples of gaseous synthetic fuels include methane, propane, and butane. Examples of liquid synthetic fuels include methanol, ethanol, dimethyl ether, gasoline, kerosene, jet fuel, diesel, and heavy oil. Examples of synthetic compounds other than synthetic fuels include naphtha, olefins, aromatic compounds, methanol, ethanol, dimethyl ether, butadiene, and aldehydes. By using the synthetic chemical production system according to the embodiment of the present disclosure, even if different types of synthetic chemicals are produced, H can be produced with higher precision to match the desired synthetic chemicals. ２ The CO / CO ratio can be controlled.

[0025] [Synthetic Chemical Production System According to First Embodiment] First, a synthetic chemical production system according to a first embodiment of the present disclosure will be described in detail. Fig. 1 is a schematic diagram of a synthetic chemical production system 10 that is preferably used in the first embodiment of the present disclosure. The synthetic chemical production system 10 includes a voltage and current control device 1, a voltage and current control device 2, a water electrolysis device 3, a CO ２The system includes an electrolysis device 4, a detection device 5, a control device 6A, and a synthetic chemical manufacturing device 9. The voltage and current control device 1 is a voltage and current control device for the water electrolysis device 3, and the voltage and current control device 2 is a ２ This is a voltage and current control device for the electrolysis device 4. Both the voltage and current control device 1 and the voltage and current control device 2 control the voltage and current of the electric power generated by power generation.

[0026] (Renewable Energy) In this embodiment, the power generation is preferably power generation using renewable energy. When renewable energy is used, the energy supply tends to become unstable. Even in such an energy supply state, according to this embodiment, it is possible to accurately generate H ２ The / CO ratio can be controlled. As the renewable energy, one or more types of renewable energy such as solar light S and wind power W can be used. Although two types of renewable energy, solar light S and wind power W, are shown in FIG. 1 , the renewable energy used in the voltage / current control device 1 and the voltage / current control device 2 may be either solar light S or wind power W, or both, independently of each other. Alternatively, renewable energy other than solar light S and wind power W may be used. Examples of renewable energy other than solar light S and wind power W include solar heat, geothermal heat, biomass, hydropower, tidal power, wave power, and ocean currents. Furthermore, electrical energy may be partially obtained from a grid power source that provides stable power, or it is also possible to partially use a power source stored in a storage battery or the like.

[0027] (Electrolysis Device) The water electrolysis device 3 includes a reduction electrode, an electrolyte, and an oxidation electrode. The water electrolysis device 3 preferably includes a separator. The electrolyte preferably includes at least one selected from the group consisting of an electrolytic solution, a polymer electrolyte membrane, and a solid electrolyte. The electrolyte may be in any form, such as a solid oxide type, a solid polymer type, or an alkaline type. ２ The electrolysis device 4 includes a reduction electrode, a polymer membrane, and an oxidation electrode. ２The electrolysis device 4 preferably includes a separator. In the present invention, a polymer membrane refers to a membrane containing a polymer. Since a polymer membrane has ion conductivity at room temperature, the electrolysis device can be operated at a low temperature of 100°C or less, and energy consumption is reduced. Examples of polymer membranes include polymer electrolyte membranes and polymer-containing porous membranes. Among these, a polymer electrolyte membrane is preferred. The polymer electrolyte membrane is preferably a PEM (Polymer Electrolyte Membrane) type solid polymer electrolyte membrane.

[0028] The separator is used for water electrolysis or CO ２ This is a current collector that transmits electricity to the electrodes during electrolysis. ２ The separator provides a passage for supplying the electrolyte to the electrodes, and also acts as a partition to separate the reduction products from the oxidation products. The separator must be electrically conductive and resistant to oxidation and reduction, so it is preferably made of graphite or titanium. Furthermore, to improve electrical conductivity, the surface of the separator is preferably plated with platinum or gold.

[0029] The water electrolysis device 3 is supplied with power from the voltage and current control device 1 and electrolyzes water to produce H ２ The water electrolysis device 3 may be, for example, a solid oxide type, a solid polymer type, or an alkaline type. Specifically, in the case of a solid oxide type, water is supplied to the reduction electrode (cathode) side and H is produced by the following reaction (1): ２ and oxygen ions are generated, and the generated oxygen ions permeate the polymer membrane and are converted to O on the oxidation electrode (anode) side by the following reaction (2): ２ is produced. Reduction electrode: H ２ O + 2e － →H ２ +O ２－ (1) Oxidation electrode: O ２－ → (1 / 2) O ２ +2e － (2)

[0030] CO ２ The electrolysis device 4 is supplied with power from the voltage and current control device 2 and ２is electrolyzed to produce CO and H ２ CO is produced as a by-product at the reduction electrode (cathode) ２ The reduction reaction shown in the formula (3) and formula (4) below occurs when a cation exchange membrane is used as the polymer membrane, whereas the reduction reaction shown in the formula (5) and formula (6) below occurs when an anion exchange membrane is used as the polymer membrane.

[0031] CO ２ +2H ＋ +2e － →CO+H ２ O (3) 2H ＋ +2e － →H ２ (4) H ２ O+CO ２ +2e － →CO + 2OH － (5) 2H ２ O + 2e － →H ２ +2OH － (6)

[0032] The oxidation reaction at the oxidation electrode (anode) varies depending on the type of polymer membrane. When a cation exchange membrane is used as the polymer membrane, the oxidation reaction shown in the following reaction formula (7) occurs, and when an anion exchange membrane is used as the polymer membrane, the oxidation reaction shown in the following reaction formula (8) occurs.

[0033] 2H ２ O → O ２ +4H ＋ +4e － (7) 4OH － →O ２ +2H ２ O+4e － (8)

[0034] CO ２ CO relative to the amount of CO produced in the electrolysis device ２ By-product H produced in the electrolysis device ２ and H generated in the water electrolysis device ２ The ratio of the total amount (H ２For example, when the purpose is to produce methane, the ratio (H ２ For example, when the purpose is to produce gasoline, kerosene, diesel, alcohol, etc., the ratio (H ２ For example, when the purpose is to produce an aldehyde using an olefin, the ratio (H ２ / CO) is preferably 0.5 or more and less than 1.5 in terms of molar ratio.

[0035] CO ２ From the outlet of the electrolysis device 4, unreacted CO ２ In this case, CO ２ Downstream of the electrolysis device 4 and upstream of the synthetic chemical manufacturing device 9, ２ It is preferable to remove the removed CO ２ By sending the CO ２ can be recycled.

[0036] The electrolysis device is configured as a CO electrolysis device using a PEM-type polymer membrane. ２ An electrolysis device will be described in detail below. Fig. 5 is a schematic diagram of a solid polymer electrolyte electrolysis device preferably used in this embodiment. The solid polymer electrolyte electrolysis device 800 shown in Fig. 5 includes a cathode (negative electrode) 200, an anode (positive electrode) 400 that forms a pair of electrodes with the cathode 200, a solid polymer electrolyte 300 that is interposed in contact between the cathode 200 and the anode 400, and a voltage application unit 700 that applies a voltage between the cathode 200 and the anode 400. The solid polymer electrolyte electrolysis device 800 further includes a cathode separator 100, an anode separator 500, and an electrolytic solution 600.

[0037] <<Cathode Separator>> Examples of the cathode separator (negative electrode separator) 100 include metal materials such as graphite, titanium (Ti), copper (Cu), nickel (Ni), stainless steel (SUS), nickel-plated steel, and brass, with graphite being preferred from the standpoints of ease of processing and cost. When the cathode separator is made of a metal material, examples of its shape include metal foil, metal plate, thin metal film, expanded metal, punched metal, and foamed metal. When the material is graphite, examples of the shape include a graphite plate.

[0038] The cathode separator 100 may be provided with a gas supply hole for supplying a source gas containing carbon dioxide to the cathode (negative electrode) 200 and a gas recovery hole for recovering a product gas containing carbon monoxide. The provision of the gas supply hole and the gas recovery hole allows the source gas to be uniformly and efficiently delivered to the cathode and the product gas (including unreacted source gas) to be discharged. The cathode separator 100 may be provided with only one gas supply hole and one gas recovery hole, or two or more gas supply holes and gas recovery holes. The shape, location, size, etc. of the gas supply hole and the gas recovery hole are not limited and may be set appropriately. In addition, if the cathode separator 100 is breathable, the gas supply hole and the gas recovery hole are not necessarily required. Note that if the cathode (negative electrode) 200 has a role of transmitting electrons and a gas flow path, the cathode separator 100 is not necessarily required.

[0039] <<Cathode>> The cathode (negative electrode) 200 usually has a gas diffusion layer and a catalyst layer. The gas diffusion layer is adjacent to the catalyst layer and absorbs carbon dioxide (CO 2 ) from the outside air. ２ ) and CO ２ The gas diffusion layer includes, for example, carbon paper or nonwoven fabric, or a metal mesh. Examples of the gas diffusion layer include graphite carbon, glassy carbon, titanium, and SUS steel.

[0040] When a carbon dioxide reduction catalyst layer is used as the catalyst layer, the catalyst layer contains at least a catalyst and may further contain an ionomer. The catalyst preferably contains carbon and is composed of a support on which inorganic fine particles or a metal complex are supported. In the catalyst of the technology disclosed herein, the component exhibiting catalytic activity is inorganic fine particles or a metal complex supported on a support. In the technology disclosed herein, the inorganic fine particles and metal complexes are referred to as "catalyst sources," and the support on which the catalyst source is supported is referred to as the "catalyst." The support according to this embodiment supports inorganic fine particles or a metal complex as the catalyst source. In the technology disclosed herein, "inorganic fine particles" refers to metals and inorganic compounds having an average particle size of 1 nm to 100 nm as measured by photographic observation with a scanning electron microscope or the like. When a metal complex or a monoatomic catalyst is used, the metal portion is an ion with an ionic radius of 0.04 nm to 10 nm.

[0041] When the catalyst layer is used as a catalyst layer for carbon dioxide reduction, the inorganic fine particles and metal complexes preferably serve as catalyst sources that have the function of producing at least carbon monoxide through a reduction reaction. Specifically, the inorganic fine particles for carbon dioxide reduction are preferably fine particles selected from the group consisting of gold, silver, copper, nickel, iron, cobalt, zinc, chromium, palladium, tin, manganese, aluminum, indium, bismuth, molybdenum, and carbon nitride. Only one inorganic fine particle may be used, or two or more inorganic fine particles may be used in combination. The metal complex used as a catalyst source for carbon dioxide reduction is a metal complex in which a ligand is coordinated to a metal or an ion of the metal, and the metal ion is preferably selected from the group consisting of copper, nickel, iron, cobalt, zinc, manganese, molybdenum, and aluminum.

[0042] The inorganic fine particles and metal complexes are supported on the carrier according to this embodiment by carrying out a known method such as vapor deposition, deposition, adsorption, accumulation, adhesion, welding, physical mixing, or spraying.

[0043] The catalyst in the technology of the present disclosure is preferably coated with an ionomer. By coating the catalyst with an ionomer, an ion-conducting channel is easily formed between the coated catalyst and the solid electrolyte described below, facilitating the movement of ions generated by the reaction, thereby enabling improvement of the electrolysis efficiency.

[0044] The support according to this embodiment is not particularly limited, but preferably contains carbon from the viewpoint of imparting electrical conductivity. Carbon is usually electrically conductive, and therefore a support containing carbon is an electrically conductive support. The carbon-containing support is not limited as long as it is an electrically conductive material that can be used as a gas diffusion layer in an electrode provided in an apparatus for reducing carbon dioxide, and examples of carbon include carbon black (furnace black, acetylene black, ketjen black, medium thermal carbon black, etc.), activated carbon, graphite, carbon nanotubes, carbon nanofibers, carbon nanohorns, graphene nanoplatelets, nanoporous carbon, etc., and among these, carbon black is preferred from the viewpoint of improving the active site density.

[0045] <<Solid Electrolyte>> The solid electrolyte 300 is the PEM-type polymer membrane described above. Various ionomers can be used as the polymer, and may be a cation exchange resin or an anion exchange resin, but an anion exchange resin is preferable. That is, the solid electrolyte is preferably an anion exchange membrane. It is more preferable to use the same anion exchange resin as the ionomer used in the catalyst layer described above. The solid electrolyte 300 may be a commercially available product as a cation exchange membrane or an anion exchange membrane. When an anion exchange membrane is used as the solid electrolyte 300, the base site density is 0.5 mmol / cm in a dry state. ３ 5.0 mmol / cm or more ３ It is preferable that the concentration is 2.5 mmol / cm or less. ３ 4.5 mmol / cm or more ３ More preferably, it is less than 2.9 mmol / cm ３ 4.5 mmol / cm or more ３ It is more preferable that it is less than 10 ...

[0046] Examples of cation exchange membranes that can be used include strongly acidic cation exchange membranes in which sulfonic groups have been introduced into a fluororesin matrix, such as Nafion 117, Nafion 115, Nafion 212, and Nafion 350 (all of which are trade names ("NAFION" is a registered trademark) manufactured by Chemours Corporation), and strongly acidic cation exchange membranes in which sulfonic groups have been introduced into a styrene-divinylbenzene copolymer matrix, such as Neosepta CSE (trade name, manufactured by Astom Corporation). Examples of anion exchange membranes that can be used include anion exchange membranes having one or more ion exchange groups selected from the group consisting of quaternary ammonium groups, primary amino groups, secondary amino groups, and tertiary amino groups. Specific examples include Neosepta (registered trademark) ASE, AHA, ACS, and AFX (manufactured by Astom Corporation), and Selemion (registered trademark) AMVN, DSVN, AAV, ASVN, and AHO (manufactured by AGC Inc.).

[0047] <<Anode>> The anode 400 is a gas diffusion electrode including a gas diffusion layer. The gas diffusion layer includes, for example, a metal mesh. The electrode material of the anode 400 is, for example, Ir, IrO ２ , Ru, RuO ２ , Co, CoOx, Cu, CuOx, Fe, FeOx, FeOOH, FeMn, Ni, NiOx, NiOOH, NiCo, NiCe, NiC, NiFe, NiCeCoCe, NiLa, NiMoFe, NiSn, NiZn, SUS, Au, Pt, etc.

[0048] <<Anode Separator>> The anode separator (positive electrode separator) 500 preferably has electrical conductivity so as to receive electrons from the anode 400, and also has rigidity to support the anode 400. From this perspective, metal materials such as titanium (Ti), copper (Cu), nickel (Ni), stainless steel (SUS), nickel-plated steel, and brass can be suitably used for the anode separator 500. Among these, titanium is preferable from the viewpoint of oxidation resistance.

[0049] <<Electrolyte>> The electrolyte 600 is preferably an aqueous solution having a pH of 5 or more. Examples of the electrolyte include an aqueous carbonate solution and an aqueous bicarbonate solution (e.g., KHCO ３ aqueous solution), sulfate aqueous solution, borate aqueous solution, sodium hydroxide aqueous solution, potassium hydroxide aqueous solution, sodium chloride aqueous solution, etc.

[0050] <<Voltage Application Unit>> The voltage application unit 700 applies a voltage between the cathode 200 and the anode 400 by applying a voltage to the cathode separator 100 and the anode separator 500. Here, since both current collector plates are conductors, they supply electrons to the cathode 200 and receive electrons from the anode 400. Furthermore, a control unit (not shown) may be electrically connected to the voltage application unit 700 in order to apply an appropriate voltage.

[0051] <<Other Components>> The solid polymer electrolyte electrolysis device 800 according to this embodiment may be provided with a reactant gas supply unit (not shown) outside the solid polymer electrolyte electrolysis device 800. That is, a reactant gas, CO ２ The reactive gas may be supplied from a reactive gas supply unit to the gas supply hole via a pipe or the like (not shown), or the cathode separator 100 may be provided so that the reactive gas is sprayed onto the surface of the cathode separator 100 opposite to the surface that comes into contact with the cathode 200. From an environmental perspective, it is preferable to use factory exhaust gas emitted from a power plant or factory as the reactive gas.

[0052] The reactant gas supply unit supplies CO ２ is supplied in a gaseous state to the solid polymer electrolyte electrolysis device 800, ２ is supplied to the cathode 200 through a gas supply hole provided in the cathode separator 100. ２When a cation exchange membrane is used as the solid polymer electrolyte 300, the reduction reactions of the above-mentioned reaction formulas (3) and (4) occur by contacting the catalyst layer of the cathode 200. When an anion exchange membrane is used as the solid electrolyte 300, the reduction reactions of the above-mentioned reaction formulas (5) and (6) occur, resulting in the conversion of CO and H. ２ A gas containing at least

[0053] (Detection Device 5) The detection device 5 used in the synthetic chemical manufacturing system 10 detects CO ２ CO and by-product H produced in the electrolysis device 4 ２ For example, the ratio of the amount of CO and by-product H ２ The concentration of each of the components can be measured, and the ratio of the amounts can be determined as a molar ratio or a mass ratio. There are no particular limitations on the detection device 5, and for example, an electrochemical sensor, an optical sensor, a semiconductor sensor, or the like can be used.

[0054] (Synthetic Chemical Product Manufacturing Apparatus) In the synthetic chemical product manufacturing apparatus 9, H generated in the water electrolysis device 3 is ２ , and CO ２ CO and by-product H produced in the electrolysis device 4 ２ The detection device 5 and the control device 6A detect the amount of H produced in the water electrolysis device 3. ２ The amount of CO ２ CO and by-product H produced in the electrolysis device 4 ２ Since it is controlled according to the ratio of the amount of H ２ The / CO ratio can be controlled, allowing the stable synthesis of desired synthetic chemical products.

[0055] Examples of synthesis reactions via catalytic reactions include alcohol synthesis reactions, methanation reactions, Fischer-Tropsch reactions, and oxo synthesis reactions. Examples of alcohol synthesis reactions include methanol synthesis. Examples of catalysts used in methanol synthesis include copper-based catalysts and palladium-based catalysts. Examples of copper-based catalysts include copper-zinc-aluminum catalysts. Examples of synthesis reactions via alcohol synthesis reactions include dimethyl ether synthesis reactions. Specifically, dimethyl ether can be produced by performing the methanol synthesis reaction followed by a dehydration condensation reaction using an acid catalyst. Another method for producing the dimethyl ether synthesis reaction includes a method in which the methanol synthesis reaction and the dehydration condensation reaction are carried out simultaneously using a catalyst that combines a methanol synthesis catalyst and an acid catalyst. Examples of acid catalysts include alumina, ion exchange resins, and zeolites. Examples of catalysts used in the methanation reaction (methane synthesis reaction) include nickel-based catalysts and copper-based catalysts. Examples of catalysts used in the Fischer-Tropsch (FT) reaction include iron-based catalysts, cobalt-based catalysts, and ruthenium-based catalysts. The oxo synthesis reaction is basically a reaction of an olefin with an oxo gas (H ２ The oxo synthesis reaction is a reaction in which an olefin is reacted with a fluorine-containing gas (CO mixed gas) to obtain an aldehyde having one more carbon atom than the olefin. Examples of catalysts used in the oxo synthesis reaction include Co, Rh, Ir, Ru, Os, and Pt.

[0056] In the synthetic chemical production apparatus 9, when methanol is produced as a synthetic chemical, for example, hydrogen and carbon monoxide are supplied and methanol is synthesized in the presence of a catalyst according to the following reaction formula (9): CO + 2H ２ →CH ３ OH (9) As a catalyst for producing methanol, for example, a copper-zinc-aluminum catalyst can be used, which is used to produce CO and H at 2 to 10 MPa and 180 to 300°C. ２ can be reacted to synthesize methanol.

[0057] In the synthetic chemical production apparatus 9, for example, when liquid hydrocarbons are produced as synthetic chemicals, hydrogen and carbon monoxide are supplied and hydrocarbons are synthesized in the presence of a catalyst based on the following FT reaction formula (10): nCO+(2n+1)H ２ →C ｎ H ２ｎ＋２ +nH ２ O (10) As a catalyst for producing liquid fuel by the FT reaction, for example, an iron (Fe) or cobalt (Co) catalyst can be used, and CO and H are reacted at 0.9 to 7 MPa and 200 to 350°C. ２ can be reacted to synthesize hydrocarbon liquid fuels.

[0058] H flowing into synthetic chemical manufacturing equipment 9 ２ and CO is H ２ It is preferable that the ratio of H to CO is constant and the absolute amount is also constant. ２ Not only can the / CO ratio be controlled with precision, but also the H ２ The absolute amount of CO can also be controlled with high precision.

[0059] (Control device 6A) The control device 6A used in the synthetic chemical manufacturing system 10 is ２ CO and by-product H produced in the electrolysis device 4 ２ The H from the water electrolysis device 3 to the synthetic chemical manufacturing device 9 is ２ supply amount, and CO ２ CO and by-product H from the electrolysis device 4 to the synthetic chemical manufacturing device 9 ２ As a control method, for example, as shown in FIG. 1, a voltage / current control device 1 is controlled to control at least one of the supply amounts of H ２ The supply amount is controlled, and the voltage and current control device 2 is controlled. ２ The CO supply amount and H ２ The control device 6A controls the amount of H supplied from the water electrolysis device 3 to the synthetic chemical production device 9 in accordance with the desired synthetic chemical to be produced in the synthetic chemical production device 9. ２ supply amount, and CO ２ CO and by-product H from the electrolysis device 4 to the synthetic chemical manufacturing device 9 ２At least one of the supply amounts of the above may be controlled.

[0060] [Synthetic Chemical Production System According to Second Embodiment] Next, a synthetic chemical production system according to a second embodiment of the present disclosure will be described. Fig. 2 is a schematic diagram of a synthetic chemical production system 20 that is preferably used in the second embodiment of the present disclosure. The synthetic chemical production system 20 includes a voltage and current control device 1, a voltage and current control device 2, a water electrolysis device 3, a CO ２ The synthetic chemical manufacturing system 20 includes an electrolysis device 4, a detection device 5, a control device 6B, and a synthetic chemical manufacturing device 9. The synthetic chemical manufacturing system 20 includes a voltage and current control device 1, a voltage and current control device 2, a water electrolysis device 3, a CO ２ The electrolysis device 4, the detection device 5, and the synthetic chemical production device 9 are the same as those of the voltage and current control device 1, the voltage and current control device 2, the water electrolysis device 3, the CO ２ The control device 6B is similar to the electrolysis device 4, the detection device 5, and the synthetic chemical production device 9. The renewable energy (solar power S, wind power W, etc.) used in the synthetic chemical production system 20 can also be the various renewable energies described in the synthetic chemical production system 10. The control device 6B, which is an element unique to the synthetic chemical production system 20, will be described below.

[0061] (Controller 6B) The controller 6B used in the synthetic chemical manufacturing system 20 sends a signal to the voltage / current controller 1 to control the power supply of the voltage / current controller 1 in accordance with the ratio obtained by the detector 5. For example, as shown in FIG. ２ By-product H obtained in electrolysis device 4 ２ When the amount of H in the water electrolysis device 3 is small, the power supply of the voltage and current control device 1 is increased. ２ It is also possible to increase the amount of CO ２ By-product H obtained in electrolysis device 4 ２ If the amount of H in the water electrolysis device 3 is large, the power supplied by the voltage and current control device 1 is reduced. ２ The power supplied by the voltage and current control device 1 may be controlled in accordance with the desired synthetic chemical product to be produced in the synthetic chemical product production apparatus 9.

[0062] [Synthetic Chemical Production System According to a Third Embodiment] Next, a synthetic chemical production system according to a third embodiment of the present disclosure will be described. Fig. 3 is a schematic diagram of a synthetic chemical production system 30 that is preferably used in the third embodiment of the present disclosure. The synthetic chemical production system 30 includes a voltage and current control device 1, a voltage and current control device 2, a water electrolysis device 3, a CO ２ The synthetic chemical manufacturing system 30 includes an electrolysis device 4, a detection device 7A, a control device 8A, a storage tank T1, a storage tank T2, and a synthetic chemical manufacturing device 9. The synthetic chemical manufacturing system 30 includes a voltage and current control device 1, a voltage and current control device 2, a water electrolysis device 3, a CO ２ The electrolysis device 4 and the synthetic chemical production device 9 are provided in a synthetic chemical production system 10. ... ２ This is similar to the electrolysis device 4 and the synthetic chemical production device 9. Furthermore, the renewable energy (solar power S, wind power W, etc.) used in the synthetic chemical production system 30 can also be the various renewable energies described in connection with the synthetic chemical production system 10. Below, the storage tank T1, storage tank T2, detection device 7A, and control device 8A, which are elements unique to the synthetic chemical production system 30, will be described.

[0063] (Storage Tanks T1, T2) The storage tank T1 stores the H generated by the water electrolysis device 3. ２ The storage tank T2 stores CO ２ CO and by-product H produced in the electrolysis device 4 ２ The synthetic chemical manufacturing system 30 includes the storage tanks T1 and T2, and stores CO and H ２ can be stably supplied to the synthetic chemical manufacturing equipment 9.

[0064] (Detection Device 7A) The detection device 7A used in the synthetic chemical production system 30 is provided in the storage tank T2 and detects CO and by-product H in the storage tank T2. ２ The detector 7A detects the ratio of the amounts of CO and by-product H. ２The concentration of each of the components can be measured, and the ratio of the amounts can be determined as a molar ratio or a mass ratio. There are no particular limitations on the detection device 7A, and for example, an electrochemical sensor, an optical sensor, a semiconductor sensor, or the like can be used.

[0065] (Control device 8A) The control device 8A used in the synthetic chemical manufacturing system 30 detects CO and by-product H in the storage tank T2 obtained by the detection device 7A. ２ The H from the storage tank T1 to the synthetic chemical manufacturing equipment 9 is ２ and the amount of CO and by-product H supplied from the storage tank T2 to the synthetic chemical manufacturing plant 9. ２ The control device 8A controls at least one of the supply amounts of CO and by-product H in the storage tank T2. ２ H from the storage tank T1 according to the ratio of the amounts of ２ The control device 8A may be configured to be able to control the supply amount of by-product H in the storage tank T2, for example. ２ If the amount of H is small, ２ By increasing the supply amount of H in the storage tank T2, ２ If the amount of H from the storage tank T1 is large, ２ As a control method, for example, as shown in FIG. 3, the voltage and current control device 1 is controlled to reduce the amount of H supplied from the water electrolysis device 3. ２ The supply amount is controlled, and the voltage and current control device 2 is controlled. ２ The CO supply amount and H ２ The control device 8A controls the supply amount of H from the storage tank T1 in accordance with the desired synthetic chemical to be produced in the synthetic chemical production device 9. ２ Furthermore, the amount of CO supplied from the storage tank T2 and the amount of H ２ The supply amount may be controlled.

[0066] [Synthetic Chemical Production System According to Fourth Embodiment] Next, a synthetic chemical production system according to a fourth embodiment of the present disclosure will be described. Fig. 4 is a schematic diagram of a synthetic chemical production system 40 that is preferably used in the fourth embodiment of the present disclosure. The synthetic chemical production system 40 includes a voltage and current control device 1, a voltage and current control device 2, a water electrolysis device 3, a CO ２ The synthetic chemical production system 40 includes an electrolysis device 4, a detection device 7B, a control device 8B, a storage tank T, and a synthetic chemical production device 9. The synthetic chemical production system 40 includes a voltage and current control device 1, a voltage and current control device 2, a water electrolysis device 3, a CO ２ The electrolysis device 4 and the synthetic chemical production device 9 are the same as those of the voltage and current control device 1, the voltage and current control device 2, the water electrolysis device 3, the CO ２ This is similar to the electrolysis device 4 and the synthetic chemical production device 9. Furthermore, the renewable energy (solar power S, wind power W, etc.) used in the synthetic chemical production system 40 can also be the various renewable energies described in connection with the synthetic chemical production system 10. The storage tank T, the detection device 7B, and the control device 8B, which are elements unique to the synthetic chemical production system 40, will be described below.

[0067] (Storage Tank T) The storage tank T stores the H generated by the water electrolysis device 3. ２ , and CO ２ CO and by-product H produced in the electrolysis device 4 ２ The synthetic chemical manufacturing system 40 includes a storage tank T, which stores CO and H ２ can be stably supplied to the synthetic chemical manufacturing equipment 9.

[0068] (Detection Device 7B) The detection device 7B used in the synthetic chemical manufacturing system 40 is provided in the storage tank T and detects CO and H ２ The detector 7B detects the ratio of the amounts of CO and H ２ The concentration of each of the components can be measured, and the ratio of the amounts can be determined as a molar ratio or a mass ratio. There are no particular limitations on the detection device 7B, and for example, an electrochemical sensor, an optical sensor, a semiconductor sensor, or the like can be used.

[0069] (Control device 8B) The control device 8B used in the synthetic chemical manufacturing system 40 controls the H from the water electrolysis device 3 to the storage tank T in accordance with the ratio obtained by the detection device 7B. ２ supply amount, and CO ２ CO and by-product H from the electrolysis device 4 to the storage tank T ２ The control device 8B controls at least one of the supply amounts of H ２ When the amount of H is small, the H ２ Increasing the supply of H in the storage tank T ２ When the amount of H is large, ２ As a control method, for example, as shown in FIG. 4, the voltage and current control device 1 is controlled to reduce the amount of H supplied from the water electrolysis device 3. ２ The supply amount is controlled, and the voltage and current control device 2 is controlled. ２ The CO supply amount and H ２ In addition, the amount of CO and H supplied from the tank T to the synthetic chemical manufacturing plant 9 can be controlled. ２ The amount of the supplied material may be controlled.

[0070] According to this embodiment, even if electricity derived from renewable energy, which is a variable power source, is used, stable H ２ and CO, and can be tailored to the desired synthetic chemicals with higher precision than ever before. ２ The CO / CO ratio can be controlled to produce synthetic chemicals.

[0071] 1 Voltage and current control device 2 Voltage and current control device 3 Water electrolysis device 4 CO ２Electrolysis device 5 Detector 6A Control device 6B Control device 7A Detector 7B Detector 8A Control device 8B Control device 9 Synthetic chemical product manufacturing device 10 Synthetic chemical product manufacturing system according to first embodiment 20 Synthetic chemical product manufacturing system according to second embodiment 30 Synthetic chemical product manufacturing system according to third embodiment 40 Synthetic chemical product manufacturing system according to fourth embodiment 100 Cathode separator 200 Cathode (negative electrode) 300 Solid electrolyte (ion exchange membrane) 400 Anode (positive electrode) 500 Anode separator 600 Electrolyte solution 700 Voltage application unit 800 Solid polymer electrolyte electrolysis device

Claims

1. A voltage / current control device 1 that controls the voltage and current of the power generated by power generation, a reduction electrode, an electrolyte, and an oxidation electrode. Power is supplied from the voltage / current control device 1, and water is electrolyzed to produce H ２ a water electrolysis device that generates CO; a voltage and current control device 2 that controls the voltage and current of the power generated by the power generation; and a reduction electrode, a polymer membrane, and an oxidation electrode. ２ CO is produced by electrolysis of ２ An electrolysis device; ２ CO and by-product H produced in the electrolysis device ２ a detection device for detecting the ratio of the amount of H generated in the water electrolysis device; ２ and the CO ２ CO and by-product H produced in the electrolysis device ２ a synthetic chemical production apparatus for producing a synthetic chemical by a catalytic reaction based on the ratio; and ２ and the CO ２ CO and by-product H from the electrolysis device to the synthetic chemical manufacturing device ２ and a control device for controlling at least one of the supply amounts of the above.

2. A voltage / current control device 1 that controls the voltage and current of the power generated by power generation, a reduction electrode, an electrolyte, and an oxidation electrode, and a device that receives power from the voltage / current control device 1 and electrolyzes water to produce H ２ a water electrolysis device that generates CO; a voltage and current control device 2 that controls the voltage and current of the power generated by the power generation; and a reduction electrode, a polymer membrane, and an oxidation electrode. ２ CO is produced by electrolysis of ２ An electrolysis device; ２ CO and by-product H produced in the electrolysis device ２ a detection device for detecting the ratio of the amount of H generated in the water electrolysis device; ２ and the CO ２ CO and by-product H produced in the electrolysis device ２ and a control device that sends a signal to the voltage and current control device (1) to control the power supply of the voltage and current control device (1) in accordance with the ratio.

3. A voltage / current control device 1 that controls the voltage and current of the power generated by power generation, a reduction electrode, an electrolyte, and an oxidation electrode, and a device that receives power from the voltage / current control device 1 and electrolyzes water to produce H ２ a water electrolysis device for generating H ２ a storage tank T1 for storing CO; a voltage and current control device 2 for controlling the voltage and current of the power generated by the power generation; and a reduction electrode, a polymer membrane, and an oxidation electrode. ２ CO is produced by electrolysis of ２ An electrolysis device; ２ CO and by-product H produced in the electrolysis device ２ A storage tank T2 for storing CO and by-product H in the storage tank T2. ２ A detection device for detecting the ratio of the amount of H supplied from the storage tank T1. ２ , and CO and by-product H supplied from the storage tank T2 ２ A synthetic chemical manufacturing apparatus for manufacturing a synthetic chemical by a catalytic reaction based on the ratio, and a H from the storage tank T1 to the synthetic chemical manufacturing apparatus according to the ratio. ２ and the supply amount of CO and by-product H from the storage tank T2 to the synthetic chemical manufacturing equipment. ２ and a control device for controlling at least one of the supply amounts of the above.

4. The control device controls the CO and by-product H in the storage tank T2. ２ H from the storage tank T1 according to the ratio of the amounts of ２ The synthetic chemical manufacturing system according to claim 3, wherein the supply amount of the 5. A voltage / current control device 1 that controls the voltage and current of the power generated by power generation, a reduction electrode, an electrolyte, and an oxidation electrode, and a device that receives power from the voltage / current control device 1 and electrolyzes water to produce H ２ a water electrolysis device that generates CO; a voltage and current control device 2 that controls the voltage and current of the power generated by the power generation; and a reduction electrode, a polymer membrane, and an oxidation electrode. ２ CO is produced by electrolysis of ２ an electrolysis device; and H generated in the water electrolysis device. ２ and the CO ２ CO and by-product H produced in the electrolysis device ２ A storage tank T for storing CO and H in the storage tank T. ２ A detection device for detecting the ratio of the amount of H supplied from the storage tank T ２ , and CO and by-product H supplied from the storage tank T ２ A synthetic chemical manufacturing apparatus for manufacturing a synthetic chemical by a catalytic reaction based on the ratio, and a water electrolysis apparatus for transferring H from the water electrolysis apparatus to the storage tank T in accordance with the ratio. ２ and the CO ２ CO and by-product H from the electrolysis device to the storage tank T ２ and a control device for controlling at least one of the supply amounts of the above.

6. The synthetic chemical manufacturing system according to any one of claims 1 to 5, wherein the power generation is power generation using renewable energy.

7. The water electrolysis device and the CO ２ The synthetic chemical manufacturing system according to any one of claims 1 to 6, wherein at least one of the electrolysis devices further comprises a separator.

8. The synthetic chemical manufacturing system according to any one of claims 1 to 7, wherein the electrolyte comprises at least one selected from the group consisting of an electrolytic solution, a polymer electrolyte membrane, and a solid electrolyte.

9. The synthetic chemical manufacturing system according to any one of claims 1 to 8, wherein the polymer membrane is a polymer electrolyte membrane.

10. The synthetic chemical manufacturing system according to any one of claims 1 to 9, wherein the catalytic synthesis reaction is selected from the group consisting of an alcohol synthesis reaction, a methanation reaction, a Fischer-Tropsch reaction, and an oxo synthesis reaction.

11. The above CO ２ The amount of CO produced in the electrolysis device ２ By-product H generated in the electrolysis device ２ and H generated in the water electrolysis device. ２ The ratio of the total amount (H ２ The synthetic chemical manufacturing system according to any one of claims 1 to 10, wherein the molar ratio of the catalyst (CO) is 0.5 or more and 3.5 or less.

12. The synthetic chemical production system according to any one of claims 1 to 11, wherein the synthetic chemical produced comprises at least one selected from the group consisting of methane, propane, butane, methanol, ethanol, dimethyl ether, gasoline, kerosene, jet fuel, light oil, heavy oil, naphtha, olefins, aromatic compounds, butadiene, and aldehydes.

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