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WO2018168876A1 - Système de génération de substance organique et procédé de production de substance organique - Google Patents

Système de génération de substance organique et procédé de production de substance organique Download PDF

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Publication number
WO2018168876A1
WO2018168876A1 PCT/JP2018/009808 JP2018009808W WO2018168876A1 WO 2018168876 A1 WO2018168876 A1 WO 2018168876A1 JP 2018009808 W JP2018009808 W JP 2018009808W WO 2018168876 A1 WO2018168876 A1 WO 2018168876A1
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Prior art keywords
cathode
organic matter
anolyte
circulation line
anode
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PCT/JP2018/009808
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English (en)
Japanese (ja)
Inventor
純 松本
武田　大
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Chiyoda Corp
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Chiyoda Corp
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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B3/00—Electrolytic production of organic compounds
    • C25B3/20—Processes
    • C25B3/25—Reduction
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features

Definitions

  • the present invention relates to an organic matter generation system that produces an organic matter by electroreduction of carbon dioxide, and a method for producing the organic matter.
  • the organic substance production system which produces
  • the organic matter generation system includes an electrolytic device having an anode chamber and a cathode chamber separated by a diaphragm, an anode side circulation line connected to the anode chamber, a cathode side circulation line connected to the cathode chamber, and carbon dioxide as a cathode fluid. And a liquid organic matter separator for separating organic matter from the cathode fluid, and an oxygen separator for separating oxygen from the anolyte.
  • the organic matter generation system In this organic matter generation system, carbon dioxide is reduced in the cathode chamber to generate organic matter, and water is electrolyzed in the anode chamber to generate oxygen.
  • the catholyte and anolyte circulate in the system, and the generated organic matter and oxygen are removed from the system.
  • the organic matter generation system constitutes a circulating system and can be operated continuously.
  • the present invention has an object to stabilize the generation efficiency of organic matter in a circulation type organic matter generation system. Another object of the present invention is to provide a method for producing an organic substance which can stabilize the production efficiency of the organic substance.
  • one aspect of the present invention is an organic matter generation system (1) for generating an organic matter by electroreduction of carbon dioxide, and an anode chamber (4) and a cathode partitioned by a diaphragm (3)
  • An electrolysis apparatus (6) having a chamber (5), an anode side circulation line (7) connected to the anode chamber and circulating anolyte, and a cathode chamber connected to the cathode chamber to circulate a cathode fluid containing carbon dioxide
  • a conductivity meter (28, 43) provided in each of a cathode side circulation line (8), the anode side circulation line and the cathode side circulation line, for detecting the conductivity of the anolyte and the catholyte;
  • An anode side circulation line and a cathode side circulation line are provided respectively to maintain the conductivity of the anolyte and the catholyte within a predetermined range.
  • the organic matter generation efficiency is maintained at a high level. According to the study of the present inventors, it has been confirmed that the conductivity of the catholyte and the anolyte has a great influence on the generation efficiency of the organic matter. When the conductivity decreases, the electrical resistance increases and the generation efficiency of the organic matter decreases. Conversely, when the conductivity is too high, the impurities are deposited on the cathode electrode and the reduction reaction of carbon dioxide is inhibited, and the generation efficiency of the organic matter is increased. descend.
  • the organic matter generation system by maintaining the conductivity of the catholyte and the anolyte in a predetermined optimum range, the change in the conductivity accompanying the continuous operation is suppressed, and the generation of the organic matter is efficiently performed.
  • the solution adjusting device may maintain the conductivity of the anolyte and the catholyte at 0.5 S / m or more and 15 S / m or less.
  • the generation efficiency of the organic matter is improved.
  • the conductivity of the water supplied to the anode side circulation line and the cathode side circulation line by the solution adjusting device may be 1 mS / m or less.
  • the concentration of impurities in the water supplied to the catholyte and the anolyte is suppressed to a low level, precipitation of impurities in the water on the electrode surface is suppressed. Thereby, the deterioration of the electrode is suppressed, and the decrease in the generation efficiency of the organic substance is suppressed.
  • the diaphragm may be an anion exchange membrane.
  • the decrease in the generation efficiency of the organic substance during continuous operation is suppressed.
  • a cathode side gas-liquid separator (25) provided in the cathode side circulation line for separating a gas from the cathode fluid, and provided in the cathode side circulation line, liquid organic matter from the cathode solution It is preferable to further include a liquid organic matter separation device (26) to be separated, and a carbon dioxide absorption tank (30) provided in the cathode side circulation line to make the cathode liquid absorb carbon dioxide.
  • the cathode side circulation line includes the cathode chamber, the cathode side gas-liquid separator, the liquid organic matter separator, the conductivity meter, the solution adjusting device, and the cathode chamber in the circulation direction of the cathode fluid.
  • the carbon dioxide absorption tanks may be arranged in the order described.
  • the conductivity of the cathode fluid is adjusted based on the conductivity of the cathode fluid after the organic matter is removed, so that the conductivity of the cathode fluid supplied to the cathode chamber is precisely within a predetermined range. Maintained.
  • an anode-side gas-liquid separation device provided in the anode-side circulation line to separate gas from the anolyte.
  • the electrolyte may include at least one of potassium, sodium and lithium.
  • the organic matter may include at least one of carbon monoxide, methane, ethylene, methanol, ethanol, propanol, allyl alcohol, formic acid, and acetic acid.
  • Another aspect of the present invention is a method for producing an organic substance by electroreduction of carbon dioxide, wherein the conductivity of the anolyte and the catholyte supplied to the electrolytic device having an anode chamber and a cathode chamber partitioned by a diaphragm is 0. It is characterized by maintaining at 5 S / m or more and 15 S / m or less.
  • the generation efficiency of the organic matter is improved.
  • the organic matter generation system 1 generates an organic matter by electroreduction (electrolysis) of an aqueous solution containing carbon dioxide.
  • the produced organic matter is separated from the aqueous solution in the form of gas or liquid.
  • the organic substance generated by the organic substance generation system 1 include carbon monoxide, methane, ethylene, methanol, ethanol, propanol, allyl alcohol such as 2-propen-1-ol, formic acid, and acetic acid.
  • the organic matter generation system 1 includes an electrolytic device 6 having an anode chamber 4 and a cathode chamber 5 partitioned by a diaphragm 3, and an anode side circulation line 7 connected to the anode chamber 4 and circulating anolyte. And a cathode side circulation line 8 connected to the cathode chamber 5 for circulating a cathode fluid containing carbon dioxide.
  • the anode side circulation line 7 and the cathode side circulation line 8 are passages formed by piping and are independent of each other.
  • the anolyte is an aqueous solution supplied to the anode chamber 4, and the catholyte is an aqueous solution supplied to the cathode chamber 5.
  • the anolyte is a solution in which a predetermined electrolyte is dissolved in water.
  • the catholyte is a solution in which a predetermined electrolyte and carbon dioxide are dissolved in water.
  • the electrolyte contained in the anolyte and the catholyte contains at least one of potassium, sodium, lithium, or a compound of these.
  • the electrolyte may include, for example, at least one of potassium hydroxide, sodium hydroxide, lithium hydroxide, potassium hydrogencarbonate, sodium hydrogencarbonate, lithium hydrogencarbonate, potassium carbonate, sodium carbonate and lithium carbonate.
  • the anode side circulation line 7 is provided with an anode side liquid feed pump 11, and the cathode side circulation line 8 is provided with a cathode side liquid feed pump 12.
  • the anolyte circulates through the anode chamber 4 and the anode circulation line 7 by the anode side liquid feed pump 11, and the catholyte circulates through the cathode chamber 5 and the cathode side circulation line 8 by the cathode side liquid feed pump 12.
  • FIG. 2 is a schematic view of the electrolytic device 6.
  • the electrolysis apparatus 6 is disposed in an electrolysis tank 14 as a container, a diaphragm 3 dividing an inner chamber of the electrolysis tank 14 into an anode chamber 4 and a cathode chamber 5, and an anode chamber 4.
  • An anode 15 (electrode) and a cathode 16 (electrode) disposed in the cathode chamber 5 are provided.
  • the electrolysis tank 14 has an anolyte inlet 18 and an anolyte outlet 19 connected to the anode chamber 4, and a catholyte inlet 21 and a cathode fluid outlet 22 connected to the cathode chamber 5.
  • the anolyte inlet 18 and the catholyte inlet 21 are arranged at the lower part of the electrolysis tank 14, and the anolyte outlet 19 and the catholyte outlet 22 are arranged at the upper part of the electrolysis tank 14.
  • the anolyte inlet 18 and the anolyte outlet 19 are connected to the anode circulation line 7, and the catholyte inlet 21 and the cathode outlet 22 are connected to the cathode circulation line 8.
  • the diaphragm 3 is formed of an ion exchange membrane including an anion exchange membrane or a cation exchange membrane.
  • the ion exchange membrane may be selected according to the type of electrolyte contained in the anolyte and the catholyte.
  • the anion exchange membrane is a membrane through which at least one of hydroxide ion, carbonate ion and sulfate ion can pass
  • the cation exchange membrane is a membrane through which at least one of hydrogen ion, potassium ion, sodium ion and lithium ion can pass It is good.
  • the base material of the anode 15 and the cathode 16 is made of, for example, a metal material such as nickel, molybdenum, platinum, gold, silver, copper, iron, lead or the like, carbon or a conductive ceramic.
  • the cathode 16 is made of a material widely known as a carbon dioxide reduction catalyst, for example, a Group 11 element such as copper, a Group 12 element such as zinc, a thirteenth element such as gallium, a germanium Metal materials of Group 14 elements and oxides, sulfides and phosphides containing these metals, metal complexes containing these metals and polypyridine compounds or polypyrrole compounds, or semiconductor materials such as GaP are supported.
  • the plurality of cathodes 16 may be made of only the base material without carrying these materials.
  • the anode 15 is connected to the positive electrode of a power supply not shown, and the cathode 16 is connected to the negative electrode of the power supply. Between the anode 15 and the plurality of cathodes 16, a voltage suitable for electrolysis of the aqueous solution (for example, the current density is 800 mA / cm 2 or less, and the reaction temperature in the electrolysis tank 14 is in the range of 20 ° C. to 80 ° C. Internal voltage is applied.
  • the cathode 16 and the anode 15 By applying a voltage to the cathode 16 and the anode 15, the above-described organic matter is produced from the catholyte containing carbon dioxide at the cathode 16, and oxygen is produced from the anolyte at the anode 15.
  • the electrolytic device 6 may include a plurality of sets of an anode chamber 4 having an anode 15 and a cathode chamber 5 having a cathode 16.
  • the set of the anode chamber 4 and the cathode chamber 5 may be connected in parallel with each other.
  • the cathode side circulation line 8 includes a cathode side gas-liquid separator 25, a liquid organic matter separator 26, and a cathode side tank 27 from the cathode liquid outlet 22 of the cathode chamber 5 in the circulation direction of the cathode liquid.
  • the cathode-side conductivity meter 28, the cathode-side solution adjustment device 29, and the carbon dioxide absorption tank 30 are arranged in the order described.
  • the cathode side liquid feed pump 12 is disposed between the carbon dioxide absorption tank 30 in the cathode side circulation line 8 and the end connected to the cathode fluid inlet 21 of the electrolytic device 6, and the cathode fluid toward the cathode fluid inlet 21.
  • the cathode side gas-liquid separation device 25 separates the gas component contained in the catholyte which has passed through the cathode chamber 5 from the catholyte.
  • the cathode side gas-liquid separation device 25 may be, for example, a known knockout drum.
  • the gas separated in the cathode-side gas-liquid separator 25 includes a gas component of an organic substance (referred to as a gaseous organic substance) generated at the cathode 16, hydrogen, and the like.
  • Gaseous organic substances include, for example, carbon monoxide, methane, ethylene and the like.
  • the liquid organic matter separation device 26 separates the liquid organic matter contained in the catholyte.
  • the liquid organic matter separation device 26 is, for example, a distillation column, and separates the liquid organic matter from the cathode liquid by utilizing the difference between the boiling points of water and the organic matter.
  • the liquid organic substance separated in the liquid organic substance separation device 26 is mainly the liquid component of the organic substance generated at the cathode 16.
  • the cathode side tank 27 is a container for temporarily storing the catholyte.
  • the cathode side tank 27 is provided with a cathode side liquid level gauge 27A for measuring the liquid level.
  • the cathode side tank 27 has a discharge port so that the cathode liquid can be discharged.
  • the cathode side conductivity meter 28 measures the conductivity (conductivity) of the catholyte.
  • the cathode side solution adjusting device 29 includes an electrolyte supply device 29A for supplying an electrolyte solution to the cathode side circulation line 8, a water supply device 29B for supplying water to the cathode side circulation line 8, an electrolyte supply device 29A and a water supply device 29B. And a controller 29C that controls the The electrolyte supply device 29A and the water supply device 29B include electric pumps, and the supply amounts of the electrolyte solution and water to the cathode side circulation line 8 can be changed.
  • the controller 29C of the cathode side solution adjusting device 29 supplies the electrolyte solution and water based on the conductivity of the cathode fluid measured by the cathode side conductivity meter 28 in order to maintain the conductivity of the cathode fluid in a predetermined range. Is calculated, and the electrolyte supply device 29A and the water supply device 29B are driven based on the calculated supply amount.
  • the electrolyte solution is supplied to the catholyte from the electrolyte supply device 29A to increase the conductivity, and when the conductivity of the catholyte is higher than a predetermined range Water is supplied from the water supply device 29B to the catholyte to reduce the conductivity.
  • the controller 29C of the cathode side solution adjusting device 29 responds to the drop of the liquid level of the cathode side tank 27 detected by the cathode side liquid level 27A in order to maintain the liquid level of the cathode side tank 27 within a predetermined range.
  • the water supply device 29 B is driven to supply water to the cathode side circulation line 8.
  • the control device 29C achieves both control simultaneously by executing control based on the liquid level of the cathode side tank 27 prior to control based on the conductivity of the catholyte.
  • the carbon dioxide absorption tank 30 is a container that brings gaseous carbon dioxide into contact with liquid catholyte to generate catholyte that has absorbed carbon dioxide.
  • the carbon dioxide absorption tank 30 has a pipe that supplies gaseous carbon dioxide inside, and a sprayer that sprays the catholyte from the ceiling side.
  • the carbon dioxide absorption tank 30 may have a temperature control device that adjusts the temperature of the catholyte inside.
  • the devices 44 are arranged in the described order.
  • the anode-side liquid feed pump 11 is disposed between the anode-side solution adjusting device 44 in the anode-side circulation line 7 and the end connected to the anolyte inlet 18 of the electrolyzer 6, and is directed to the anolyte inlet 18 Deliver the fluid.
  • the anode-side gas-liquid separator 41 separates gas components contained in the anolyte that has passed through the anode chamber 4 from the anolyte.
  • the anode side gas-liquid separation device 41 may be, for example, a known knockout drum.
  • the gas separated in the anode side gas-liquid separator 41 contains oxygen generated at the anode 15.
  • the anode side tank 42 is a container for temporarily storing the anode fluid.
  • the anode-side tank 42 is provided with an anode-side liquid level meter 42A that measures the liquid level.
  • the anode side tank 42 has a discharge port, and can discharge the anolyte.
  • the anode-side conductivity meter 43 measures the conductivity of the anolyte.
  • the anode side solution adjusting device 44 includes an electrolyte supply device 44A for supplying an electrolyte solution to the anode side circulation line 7, a water supply device 44B for supplying water to the anode side circulation line 7, an electrolyte supply device 44A and a water supply device 44B. And a control device 44C that controls the The electrolyte supply device 44A and the water supply device 44B include electric pumps, and can change the supply amounts of the electrolyte solution and water to the anode side circulation line 7.
  • the controller 44C of the anode-side solution adjusting device 44 supplies the electrolyte solution and water based on the conductivity of the anolyte measured by the anode-side conductivity meter 43 in order to maintain the conductivity of the anolyte within a predetermined target range.
  • the amount is calculated, and the electrolyte supply device 44A and the water supply device 44B are driven based on the calculated supply amount.
  • the electrolyte solution is supplied from the electrolyte supply device 44A to the anolyte to increase the conductivity, and when the conductivity of the anolyte is higher than the target range, the water is supplied. Water is supplied to the anolyte from unit 44B to reduce the conductivity.
  • the target range of the conductivity of the anolyte and the catholyte is set to the same range.
  • the controller 44C of the anode side solution adjusting device 44 responds to the drop in the liquid level of the anode side tank 42 detected by the anode side liquid level meter 42A in order to maintain the liquid level of the anode side tank 42 in a predetermined range.
  • the water supply device 44 B is driven to supply water to the anode side circulation line 7.
  • the controller 44 C achieves both control in a compatible manner by executing control based on the liquid level of the anode side tank 42 prior to control based on the conductivity of the anolyte.
  • the cathode side solution adjusting device 29 and the anode side solution adjusting device 44 preferably maintain the conductivity of the catholyte and the anolyte at 0.5 S / m or more and 15 S / m or less, and 1 S / m or more and 10 S / m or less It is further preferred to maintain
  • the conductivity of the water supplied by the water supply devices 29B and 44B of the cathode side solution adjusting device 29 and the anode side solution adjusting device 44 is preferably 1 mS / m or less, and 0.1 mS / m or less. preferable.
  • the electrolyte solution supplied by the electrolyte supply devices 29A and 44A of the cathode side solution adjustment device 29 and the anode side solution adjustment device 44 has an electric conductivity of 1 mS / m or less, more preferably 0.1 mS / m or less. It is preferable to dissolve and prepare.
  • the operation movement of the organic substance production system 1, and the manufacturing method of the organic substance using the organic substance production system 1 are demonstrated.
  • the catholyte circulates in the cathode chamber 5 and the cathode circulation line 8 by the cathode side feed pump 12, and the anolyte circulates in the anode chamber 4 and the anode side circulation line 7 by the anode side feed pump 11.
  • the electrolytic device 6 carbon dioxide in the cathode fluid is reduced in the cathode chamber 5 to generate an organic matter, and water in the anode fluid is oxidized in the anode chamber 4 to generate oxygen (electrolytic process).
  • the produced organic matter includes gaseous organic matter and liquid organic matter.
  • the gas containing the gaseous organic matter is separated from the cathode fluid in the cathode side gas-liquid separator 25, and the liquid organic matter is separated from the cathode fluid in the liquid organic matter separator 26 (organic matter separation Process).
  • the cathode fluid from which the organic matter has been separated is temporarily stored in the cathode side tank 27.
  • the conductivity of the catholyte that has passed through the cathode side tank 27 is measured by the cathode side conductivity meter 28 (conductivity measurement step).
  • the cathode side solution adjustment device 29 maintains the conductivity of the cathode fluid within a target range by supplying the electrolyte solution or water to the cathode fluid based on the measured conductivity (conductivity adjustment process). Further, the cathode side solution adjusting device 29 maintains the amount of the cathode liquid in the target range by supplying water to the cathode liquid according to the liquid level of the cathode side tank 27 (solution amount adjusting step).
  • the cathode fluid that has passed through the cathode side solution adjustment device 29 absorbs carbon dioxide in the carbon dioxide absorption tank 30 (carbon dioxide absorption step), and is sent to the cathode chamber 5 again.
  • the gas containing oxygen is separated from the anolyte in the anode-side gas-liquid separator 41 (oxygen separation step).
  • the anolyte from which oxygen has been separated is temporarily stored in the anode tank 42.
  • the anolyte that has passed through the anode side tank 42 is measured for conductivity by the anode side conductivity meter 43 (conductivity measurement step).
  • the anode-side solution adjusting device 44 maintains the conductivity of the anolyte within a target range by supplying the electrolyte solution or water to the anolyte based on the measured conductivity (conductivity adjustment step).
  • the solution adjusting device maintains the amount of the anode fluid in the target range by supplying water to the cathode fluid according to the liquid level of the anode side tank 42 (solution volume adjusting step).
  • the organic matter generation system 1 is a circulation type system in which the catholyte and the anolyte circulate, and continuous operation is possible.
  • the organic matter generation system 1 monitors the conductivity of the catholyte and anolyte, and supplies an electrolyte solution or water to the catholyte and anolyte to maintain the conductivity within a predetermined target range. Therefore, the conductivity of the catholyte and the anolyte is maintained within a preferable target range even when the organic substance generation system 1 continuously generates organic substances and oxygen, evaporates water, and replenishes water by continuous operation of the organic substance generation system 1. Generation is performed efficiently.
  • Example 1 In Example 1, in the above-mentioned organic matter generation system 1, the influence of the conductivity of the catholyte and the anolyte on the generation efficiency of the organic matter was confirmed.
  • the experimental apparatus had the same configuration as the above-mentioned organic matter generation system 1.
  • the catholyte and the anolyte were obtained by dissolving potassium hydrogen carbonate in water having a conductivity of 1 mS / m, and the conductivity was adjusted to various values depending on the amount of potassium hydrogen carbonate dissolved.
  • carbon dioxide which is a saturated solution amount at room temperature and atmospheric pressure was dissolved.
  • the flow rate of the catholyte and anolyte was 6 L / h.
  • the cathode 16 was copper, the anode 15 was platinum, and the diaphragm 3 was an anion exchange membrane.
  • the electrolysis was performed by applying a voltage so that a current of 2.3 A would flow between the cathode 16 and the anode 15, and continued for 2 hours at room temperature and atmospheric pressure. Then, the amount of liquid organic matter (including at least one of methane, ethylene, carbon monoxide, methanol, ethanol, propanol, allyl alcohol, formic acid, and acetic acid) generated while the electrolysis was continued was measured.
  • FIG. 3 shows the organic matter production efficiency [W ⁇ 1 ] per 1 W with respect to the conductivity of the catholyte and anolyte.
  • the organic matter production efficiency per 1 W is a value obtained by dividing the organic matter production efficiency (the sum of the Faraday efficiencies of the produced organic matter) by the power consumption.
  • the Faraday efficiency refers to the ratio of the partial current contributed to the product to the total current flowing between the cathode 16 and the anode 15. From FIG.
  • the organic matter generation efficiency per 1 W becomes the maximum value when the conductivity is about 5 S / m, and in the range of 0.5 S / m to 15 S / m or less, the conductivity per 1 W It can be seen that the organic matter generation efficiency is 3 or more, and the organic matter generation efficiency is relatively high. In addition, in the range of 1 S / m to 10 S / m of the conductivity, it can be seen that the organic matter generation efficiency per 1 W is 6 or more, and the organic matter generation efficiency is further high.
  • Example 2 In Example 2, the effect of the conductivity of water constituting the catholyte and the anolyte on the generation efficiency of the organic matter was confirmed.
  • the catholyte and anolyte were changed in Example 1 above, and the other conditions were the same.
  • the catholyte and the anolyte are either tap water, RO water (reverse osmosis filtered water), RO + ion exchange water (water treated with reverse osmosis filtered water further with ion exchange resin), or ultra pure water, hydrogen carbonate Potassium was dissolved to make the overall conductivity 5.2 S / m.
  • the conductivity of tap water, RO water, RO + ion exchange water, and ultrapure water is 10 mS / m, 1 mS / m, 0.1 mS / m, and 0.01 mS / m.
  • the voltage application is continued for 50 hours while adjusting the voltage so that a current of 2.3 A flows between the cathode 16 and the anode 15, and for each catholyte and anolyte, 30 minutes after measurement start and 50 hours after measurement start The amount of organic matter produced later was measured, and each value was compared.
  • FIG. 4 shows the ratio of formation of organic matter 50 hours after the start of measurement, where the amount of organic matter generated 30 minutes after the start of measurement is 1, with respect to each catholyte and anolyte.
  • the conductivity of water is 1 mS / m
  • the amount of organic matter produced will be 80% of the amount produced after 30 minutes after 50 hours
  • 0.1 mS / m the amount of organic matter produced after 50 hours will be It becomes about 99% of the production amount in 30 minutes.
  • the conductivity of water constituting the catholyte and the anolyte is preferably at least 1 mS / m or less, more preferably 0.1 mS / m or less.
  • the cause of the decrease in the generation amount of the organic substance over time is considered to be that the impurities contained in the water are deposited on the surface of the cathode 16 and the reaction site is reduced.
  • Example 3 In Example 3, the effect of the type of the diaphragm 3 on the generation efficiency of the organic matter was confirmed.
  • the catholyte and anolyte, and the diaphragm 3 in Example 1 described above were changed, and the other conditions were the same.
  • potassium hydrogen carbonate was dissolved in water having a conductivity of 0.1 mS / m to make the overall conductivity 5.2 S / m.
  • the diaphragm 3 was an anion exchange membrane or a cation exchange membrane.
  • the voltage application is continued for 100 hours while adjusting the voltage so that a current of 2.3 A flows between the cathode 16 and the anode 15.
  • a current of 2.3 A flows between the cathode 16 and the anode 15.
  • FIG. 5 shows the formation ratio of the organic matter after 50 hours and 100 hours when the production amount of the organic matter one hour after the start of the measurement is 1 with respect to the case where the diaphragm 3 is an anion exchange membrane or a cation exchange membrane. Show. As shown in FIG. 5, it can be seen that the amount of organic substances produced in the anion exchange membrane of the diaphragm 3 does not decrease with the passage of time, as compared with the cation exchange membrane.

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  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
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  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)

Abstract

Le problème décrit par la présente invention est de stabiliser l'efficacité de génération de substance organique d'un système de génération de substance organique à circulation. La solution selon l'invention consiste en un système de génération de substance organique (1) qui comprend : un dispositif d'électrolyse (6) qui comporte une chambre anodique (4) et une chambre cathodique (5) ; un tube de circulation côté anode (7) qui est raccordé à la chambre anodique et dans lequel circule un anolyte ; un tube de circulation côté cathode (8) qui est raccordé à la chambre cathodique et dans lequel circule un catholyte contenant du dioxyde de carbone ; des appareils de mesure de la conductivité (28, 43) qui sont disposés sur le tube de circulation côté anode et sur le tube de circulation côté cathode et qui mesurent la conductivité de l'anolyte et du catholyte ; et des dispositifs d'ajustement de la solution (29, 44) qui sont disposés sur le tube de circulation côté anode et sur le tube de circulation côté cathode et qui fournissent un électrolyte et/ou de l'eau à l'anolyte et au catholyte sur la base de la conductivité de l'anolyte et du catholyte de façon à maintenir la conductivité de l'anolyte et du catholyte dans des plages prédéterminées.
PCT/JP2018/009808 2017-03-14 2018-03-13 Système de génération de substance organique et procédé de production de substance organique Ceased WO2018168876A1 (fr)

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JP2017-048951 2017-03-14

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EP3757253A1 (fr) * 2019-06-24 2020-12-30 Siemens Aktiengesellschaft Système d'électrolyse et procédé d'accumulation de l'énergie électrique au moyen du système d'électrolyse
US20210079541A1 (en) * 2019-09-17 2021-03-18 Kabushiki Kaisha Toshiba Carbon dioxide electrolytic device and method of electrolyzing carbon dioxide
WO2024006723A1 (fr) 2022-06-30 2024-01-04 The Procter & Gamble Company Articles absorbants et procédés et appareils pour fabriquer des articles absorbants comprenant des parties frangibles

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KR102418964B1 (ko) * 2020-10-06 2022-07-11 한국과학기술연구원 이산화탄소 재순환 전기화학장치
US20250084541A1 (en) * 2021-07-21 2025-03-13 Chiyoda Corporation Carbon dioxide recovery system

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