CN112499651A - Method and device for preparing sodium bicarbonate by electrochemically capturing carbon dioxide - Google Patents
Method and device for preparing sodium bicarbonate by electrochemically capturing carbon dioxide Download PDFInfo
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- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 title claims abstract description 72
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 57
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 42
- 229910000030 sodium bicarbonate Inorganic materials 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 34
- 235000017557 sodium bicarbonate Nutrition 0.000 title claims abstract description 28
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 27
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 88
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 18
- 230000023556 desulfurization Effects 0.000 claims abstract description 17
- 238000006243 chemical reaction Methods 0.000 claims abstract description 13
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 7
- 230000005684 electric field Effects 0.000 claims abstract description 7
- 239000003546 flue gas Substances 0.000 claims abstract description 7
- 239000007832 Na2SO4 Substances 0.000 claims abstract description 4
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims abstract description 4
- 229910000342 sodium bisulfate Inorganic materials 0.000 claims abstract description 4
- WBHQBSYUUJJSRZ-UHFFFAOYSA-M sodium bisulfate Chemical compound [Na+].OS([O-])(=O)=O WBHQBSYUUJJSRZ-UHFFFAOYSA-M 0.000 claims abstract description 4
- 229910052938 sodium sulfate Inorganic materials 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims description 51
- 239000012528 membrane Substances 0.000 claims description 26
- 238000005341 cation exchange Methods 0.000 claims description 23
- 239000007789 gas Substances 0.000 claims description 20
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 9
- 150000001768 cations Chemical class 0.000 claims description 6
- 238000005273 aeration Methods 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 230000003009 desulfurizing effect Effects 0.000 claims description 5
- 239000000428 dust Substances 0.000 claims description 5
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims description 3
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 238000005342 ion exchange Methods 0.000 claims 1
- 239000011734 sodium Substances 0.000 abstract description 10
- 239000000047 product Substances 0.000 abstract description 8
- 239000006227 byproduct Substances 0.000 abstract description 6
- 239000002699 waste material Substances 0.000 abstract description 4
- 238000005261 decarburization Methods 0.000 abstract description 3
- 239000003014 ion exchange membrane Substances 0.000 abstract description 2
- 238000000746 purification Methods 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract description 2
- 239000007787 solid Substances 0.000 description 13
- 238000004062 sedimentation Methods 0.000 description 12
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 229910000029 sodium carbonate Inorganic materials 0.000 description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 8
- 229910002804 graphite Inorganic materials 0.000 description 8
- 239000010439 graphite Substances 0.000 description 8
- 239000007772 electrode material Substances 0.000 description 7
- -1 alcohol amine Chemical class 0.000 description 4
- 150000001450 anions Chemical class 0.000 description 4
- 238000005868 electrolysis reaction Methods 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- VTYYLEPIZMXCLO-UHFFFAOYSA-L calcium carbonate Substances [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 230000002745 absorbent Effects 0.000 description 2
- 239000002250 absorbent Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 238000005262 decarbonization Methods 0.000 description 2
- 238000003795 desorption Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000005431 greenhouse gas Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000001172 regenerating effect Effects 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000000909 electrodialysis Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 1
- CJTCBBYSPFAVFL-UHFFFAOYSA-N iridium ruthenium Chemical compound [Ru].[Ir] CJTCBBYSPFAVFL-UHFFFAOYSA-N 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 238000005987 sulfurization reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D7/00—Carbonates of sodium, potassium or alkali metals in general
- C01D7/07—Preparation from the hydroxides
-
- 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
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
-
- 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
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/14—Alkali metal compounds
- C25B1/16—Hydroxides
Abstract
The invention belongs to the field of flue gas purification, and discloses a method for preparing sodium bicarbonate by electrochemically capturing carbon dioxide, which uses NaHSO4、Na2SO4、Na2SO3Taking the desulfurization product as a raw material, and carrying out Na under the action of electric field drive and an ion exchange membrane+Entering a cathode chamber to generate NaOH, and controlling the pH value to remove CO in the flue gas through an electrochemical process2Trapped and converted to NaHCO3. Compared with the prior art, the method has the advantages of simple, green and economic process, and CO is captured by utilizing the desulfurization by-products2The treatment of waste by waste is realized; target product NaHCO with simultaneous decarburization3The desulfurizer is a good desulfurizer, has the characteristics of high removal efficiency, high reaction rate and the like, and can realize virtuous cycle of desulfurization and decarburization.
Description
Technical Field
The invention relates to the technical field of flue gas purification, in particular to a method and a device for preparing sodium bicarbonate by electrochemically capturing carbon dioxide.
Background
CO2、CH4、N2O、O3And the emission of greenhouse gases such as chlorofluorocarbons (CFCs) are considered to be the leading cause of global warming, among which CO2The emission amount accounts for 70% of the total greenhouse gas emission amount. In a plurality of CO2Among the emission sources, CO emitted in the process of utilizing energy mainly by fossil fuel2Is absolutely dominant. The global sea level is increased due to the greenhouse effect, fresh water resources are reduced, extreme climate occurs, human health is threatened, and the global ecosystem is seriously damaged. In 2015, the final goal of climate control is agreed at the meeting of climate change in paris, the global temperature rise is limited within 2 ℃, and in 2016, the paris climate change agreement is added in china. For this purpose, the CO produced in the combustion process is used2Trapping and storage are the most effective means of reducing the greenhouse effect. However, most of related enterprises do not have CO emission due to the high operation cost of the prior art, such as alcohol amine absorption method, adsorption method, membrane separation method and the like2And (4) collecting.
In the similar field, Chinese patent CN 108568192A discloses a carbon dioxide optimized capturing process, in which alcohol amine solution is used as absorbent to contact with flue gas in countercurrent to remove CO2The rich solution is stripped by low-pressure steam to separate CO2And (5) regenerating. The absorbent (alcohol amine) used in the process is more in industrial application, but has higher cost, easy volatilization and degradation and certain corrosivity to equipment; in addition, although the energy consumption of the system is reduced by the multistage heat exchange process, the energy consumption is reducedDesorption of CO from alcohol amine solutions2High energy consumption is difficult to avoid. In addition, chinese patent CN 109012110a discloses a method for capturing carbon dioxide by using sodium hydroxide and sodium carbonate, wherein Na is used respectively2CO3And NaOH on CO2Performing two-stage absorption, and respectively converting into NaHCO3And Na2CO3Wherein the decarbonation product NaHCO3Desorption of CO by heating2，Na2CO3Then use Ca (OH)2Or CaCO3Desorption of CO2And regenerating NaOH. The process is simple and easy to implement, the use cost is relatively low, but the quality of a large amount of generated decarbonization by-product calcium carbonate is difficult to control, and new environmental risks can be caused if the subsequent treatment is improper.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: overcomes the defects of the prior art and provides a simple, green and economic method for preparing sodium bicarbonate by electrochemically capturing carbon dioxide.
The technical scheme of the invention is to provide a method for preparing sodium bicarbonate by electrochemically capturing carbon dioxide, firstly, a reaction chamber is divided into an anode chamber and a cathode chamber by a cation exchange membrane, direct current voltage is applied to electrodes, a desulfurization product solution is positioned in the anode chamber, and Na is driven by an electric field and under the action of an ion exchange membrane+Entering a cathode chamber to generate NaOH; CO-containing gas to be captured2Gas is introduced from the cathode chamber, absorbed by NaOH and converted into desulfurizing agent NaHCO3。
Under the action of electric field drive and cation exchange membrane, cation Na+Selectively enters into the cathode chamber and is connected with OH generated by electrolyzing water in the cathode chamber-Combined to produce NaOH, H produced by electrolysis of water+Combined with anions to form H2SO4. The following reactions mainly occur in the process system:
anode chamber: 2H2O–4e-→O2(g)+4H+
H++HSO4 -→H2SO4
2H++SO4 2-→H2SO4
A cathode chamber: 2H2O+2e-→H2(g)+2OH-
OH-+Na+→NaOH
CO-containing gas to be treated2Gas is introduced from the bottom of the cathode chamber and reacts with NaOH to generate NaHCO3NaOH consumed during the reaction is generated from OH generated by cathode chamber water electrolysis-And Na to which the anode compartment has migrated+And (4) supplementing. The following reactions mainly occur in the process system:
2NaOH+CO2→Na2CO3+H2O
Na2CO3+CO2+H2O→2NaHCO3
preferably, the desulfurization product is NaHSO4、Na2SO4、Na2SO3、NaHSO3And the like, sulfate and sulfite ions. Wherein Na2SO3、NaHSO3The sulfite-containing solution is anodized in the system to sulfate, and H is generated by electrolysis of water+Combined to form H2SO4. The reactions that mainly occur are:
preferably, the cation exchange membrane is a commercially available conventional membrane with cation selectivity > 98%. Such as a cation exchange membrane of type CMI-7000.
Preferably, the cathode chamber is a sodium hydroxide solution with the initial concentration of 0.05-2 mol/L.
Preferably, said CO is contained2The gas is flue gas after dust removal, desulfurization and denitrification, and CO2The content is 5-40%.
Preferably, the current density range is 30-1000 mA/m2And the specific value is regulated by taking the pH value of the circulating liquid in the cathode chamber as an index, so that the pH value is kept in a range of 7-9, the current density is increased when the pH value is too low, and otherwise, the current density is reduced. The electrode material is a graphite electrode, such as a graphite plate, a graphite felt and the like; the cathode and the anode are made of the same electrode material, wherein the anode material can be a corrosion-resistant ruthenium-iridium coated electrode. NaHCO in Industrial applications3Desulfurization effect of (1) is more than that of Na2CO3More preferably, the main target product of the present invention is NaHCO3To obtain more NaHCO3Controlling the generation rate of NaOH in the cathode chamber by using the pH value (7-9) of the circulating liquid in the cathode chamber as an index to ensure that CO is generated2In an excessive state. The concrete expression is that 1) when the system is running, the NaOH solution absorbs CO under the condition of not powering on2(ii) a 2) When the pH value is reduced to about 9, the power supply is turned on, then the generation rate of NaOH in the cathode chamber is controlled by adjusting the current density, when the pH value is less than 8.5, the current density is increased, and conversely, the current density is reduced. Due to Na2CO3Solubility ratio NaHCO3High, 9.6g/mL and 21.5g/L at 20 ℃ respectively when NaHCO is used3After reaching the saturation concentration, CO2Can also react with NaOH to generate Na2CO3Excess CO, controlled by pH2With Na2CO3Reaction to separate out NaHCO3Solid, NaHCO3The solid enters a vertical flow precipitation/circulation tank and is precipitated and separated.
The invention relates to a method for preparing sodium bicarbonate by electrochemically capturing carbon dioxide, which uses NaHSO4、Na2SO4、Na2SO3When the desulfurization product is used as a raw material, CO in the flue gas is treated by an electrodialysis process2Absorbed and converted into NaHCO3While at the same time recovering H at the anode2SO4(ii) a Compared with the prior art, the method has simple, green and economic process, and CO is captured by utilizing the desulfurization by-product2The treatment of waste by waste is realized; target product NaHCO with simultaneous decarburization3Is a good desulfurizer, has the characteristics of high removal efficiency, high reaction rate and the like, and can realize the removalVirtuous cycle of sulfur and decarbonization, and in addition, CO capture2NaOH consumed in the process, OH produced by electrolysis of water in the cathode compartment-And Na to which the intermediate chamber has migrated+Supplement without adding extra medicament.
The invention also provides a device for preparing sodium bicarbonate by electrochemically capturing carbon dioxide, which comprises a reactor, an anode, a cathode, a cation exchange membrane and a power supply; the anode and the cathode are respectively arranged at two ends of the reactor and are connected with a power supply through leads, and the cation exchange membrane divides the reactor chamber into an anode chamber and a cathode chamber; the bottom of the cathode chamber is provided with an air inlet pipe and an aeration sieve plate connected with the air inlet pipe, the top of the cathode chamber is provided with a tail gas exhaust pipe, and the top of the anode chamber is provided with an anode exhaust pipe; the anode chamber and the cathode chamber are both provided with a liquid outlet and a liquid inlet for liquid to enter and exit and are used for liquid circulation.
Drawings
Fig. 1 is a schematic structural diagram of an apparatus for electrochemically capturing carbon dioxide to prepare sodium bicarbonate according to the present invention.
FIG. 2 is a schematic process flow diagram of the present invention.
FIG. 3 is a schematic diagram of the structure of the vertical flow settling/circulating tank of the present invention.
As shown in the figure:
1. anode chamber, 2, cathode chamber, 3, anode, 4, cathode, 5, cation exchange membrane, 6, air inlet pipe, 7, tail gas exhaust pipe, 8, anode exhaust pipe, 9, liquid outlet, 10, liquid inlet, 11, reaction device, 12, power supply, 13, anode circulation tank, 14, circulation pump I, 15, vertical flow sedimentation/circulation tank, 16, circulation pump II, 17, air inlet, 18, exhaust port, 19, liquid inlet pipe, 20, liquid outlet pipe, 21, reflecting plate, 22, solid-liquid mixture discharge port.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Meanwhile, the terms "first", "second", etc. are merely used for distinguishing names of various components, and have no primary and secondary relationship, so that the present invention is not to be construed as limited.
Example one
A method for preparing sodium bicarbonate by electrochemically capturing carbon dioxide comprises the following specific operations:
(1) the reaction chamber is divided into a cathode chamber 2 and an anode chamber 1 at room temperature by means of a cation exchange membrane 5, wherein the anode is injected with a desulfurization by-product (about 0.1mol/L NaHSO)4) The cathode chamber 2 is filled with NaOH solution with the concentration of 0.5mol/L, and cations Na are generated under the driving of an electric field and the action of a cation exchange membrane 5+Selectively enter the cathode chamber 2 and generate OH by electrolyzing water in the cathode chamber 2-H generated by electrolyzing water in the anode chamber 1 and combining NaOH generation+Combined with anions to form H2SO4。
(2) Meanwhile, the gas containing 10% carbon dioxide after dust removal, desulfurization and denitrification is introduced from the bottom air inlet 17 of the cathode chamber 2, absorbed by NaOH, and the tail gas is discharged from the top air outlet 18. The pH value of the circulating liquid in the cathode chamber 2 is controlled to be about 8 by controlling the current density, and NaHCO is used3NaHCO after saturation of the solution3The solid is separated out and separated in a vertical flow sedimentation tank.
As shown in fig. 1, an apparatus for electrochemically capturing carbon dioxide to prepare sodium bicarbonate comprises a reactor, an anode electrode 3, a cathode electrode 4, a cation exchange membrane 5 and a power supply 12; the anode electrode 3 and the cathode electrode 4 are respectively arranged at two ends of the reactor and are connected with a power supply 12 through leads, the electrode materials are graphite plates, and the reactor chamber is divided into an anode chamber 1 and a cathode chamber 2 by a cation exchange membrane 5; the bottom of the cathode chamber 2 is provided with an air inlet pipe 6 and an aeration sieve plate connected with the air inlet pipe 6, the top of the cathode chamber 2 is provided with a tail gas exhaust pipe 7, and the top of the anode chamber 1 is provided with an anode exhaust pipe 8; the cathode chamber 2 is provided with a liquid outlet 9 and a liquid inlet 10 for liquid to enter and exit, is connected with a vertical flow sedimentation/circulation groove 15 through a circulation pump II 16 and is used for the circulation of liquid and the sedimentation separation of solid; a liquid outlet pipe 20 and a liquid inlet pipe 19 are connected to the vertical flow sedimentation/circulation tank 15, the liquid outlet pipe 20 is communicated with the liquid outlet 9, the liquid inlet pipe 19 is communicated with the liquid inlet 10, a reflecting plate 21 is connected below the liquid outlet pipe 20, and a solid-liquid mixture discharge port 22 is arranged at the bottom of the vertical flow sedimentation/circulation tank 15; the anode chamber 1 is also provided with a liquid outlet 9 and a liquid inlet 10 for liquid to enter and exit, and is connected with an anode circulating tank 13 through a circulating pump I14 for liquid circulation.
During the treatment, CO2The trapping rate can reach more than 95 percent, and the NaHCO containing solid slurry separated in the vertical flow precipitation/circulation tank 153The purity of (2) is 89%, and the catalyst can be directly used as a desulfurizing agent.
Example two
A method for preparing sodium bicarbonate by electrochemically capturing carbon dioxide comprises the following specific operations:
(1) the reaction chamber is divided into a cathode chamber 2 and an anode chamber 1 at room temperature by means of a cation exchange membrane 5, wherein the anode is injected with a desulfurization by-product (about 0.5mol/L Na)2SO3) The cathode chamber 2 was filled with a 0.5mol/L NaOH solution, and 1A/m NaOH solution was applied between the anode and the cathode2The electrode materials are graphite plates. Under the action of electric field drive and cation exchange membrane 5, cations Na+Selectively enter the cathode chamber 2 and generate OH by electrolyzing water in the cathode chamber 2-Combined to produce NaOH, SO in anode chamber 13 2-Is oxidized into SO3 2-With H produced by electrolysis of water+Combined with anions to form H2SO4。
(2) Meanwhile, the gas containing 40% carbon dioxide after dust removal, desulfurization and denitrification is introduced from the bottom air inlet 17 of the cathode chamber 2, absorbed by NaOH, and the tail gas is discharged from the top air outlet 18. The pH value of the circulating liquid in the cathode chamber 2 is controlled to be 8.3 by controlling the current density, NaHCO3NaHCO after saturation of the solution3The solid is separated out and separated in a vertical flow sedimentation tank.
As shown in fig. 1, an apparatus for electrochemically capturing carbon dioxide to prepare sodium bicarbonate comprises a reactor, an anode electrode 3, a cathode electrode 4, a cation exchange membrane 5 and a power supply 12; the anode electrode 3 and the cathode electrode 4 are respectively arranged at two ends of the reactor and are connected with a power supply 12 through leads, the electrode materials are graphite plates, and the reactor chamber is divided into an anode chamber 1 and a cathode chamber 2 by a cation exchange membrane 5; the bottom of the cathode chamber 2 is provided with an air inlet pipe 6 and an aeration sieve plate connected with the air inlet pipe 6, the top of the cathode chamber 2 is provided with a tail gas exhaust pipe 7, and the top of the anode chamber 1 is provided with an anode exhaust pipe 8; the cathode chamber 2 is provided with a liquid outlet 9 and a liquid inlet 10 for liquid to enter and exit, is connected with a vertical flow sedimentation/circulation groove 15 through a circulation pump II 16 and is used for the circulation of liquid and the sedimentation separation of solid; the anode chamber 1 is also provided with a liquid outlet 9 and a liquid inlet 10 for liquid to enter and exit, and is connected with an anode circulating tank 13 through a circulating pump I14 for liquid circulation.
During the treatment, CO2The trapping rate can reach more than 85 percent, and the NaHCO containing solid slurry separated in the vertical flow precipitation/circulation tank 153The purity of the sodium bicarbonate is 98.8 percent, and the sodium bicarbonate can be directly used as a desulfurizing agent or used for producing solid sodium bicarbonate after drying treatment.
EXAMPLE III
A method for preparing sodium bicarbonate by electrochemically capturing carbon dioxide comprises the following specific operations:
(1) the reaction chamber is divided into a cathode chamber 2 and an anode chamber 1 by a cation exchange membrane 5 at room temperature, wherein the anode is injected with desulfurization by-products (0.1mol/L Na)2SO4) The cathode chamber 2 was filled with a 0.5mol/L NaOH solution, and 1A/m NaOH solution was applied between the anode and the cathode2The electrode materials are graphite plates. Under the action of electric field drive and cation exchange membrane 5, cations Na+Selectively enter the cathode chamber 2 and generate OH by electrolyzing water in the cathode chamber 2-H generated by electrolyzing water in the anode chamber 1 and combining NaOH generation+Combined with anions to form H2SO4。
(2) Meanwhile, gas containing 20 percent of carbon dioxide after dust removal, desulfurization and denitrification is introduced from an air inlet 17 at the bottom of the cathode chamber 2 and is absorbed by NaOH,the off-gas is exhausted through a top vent 18. The pH value of the circulating liquid in the cathode chamber 2 is controlled to be about 8 by controlling the current density, and NaHCO is used3NaHCO after saturation of the solution3The solid is separated out and separated in a vertical flow sedimentation tank.
As shown in fig. 1, an apparatus for electrochemically capturing carbon dioxide to prepare sodium bicarbonate comprises a reactor, an anode electrode 3, a cathode electrode 4, a cation exchange membrane 5 and a power supply 12; the anode electrode 3 and the cathode electrode 4 are respectively arranged at two ends of the reactor and are connected with a power supply 12 through leads, the electrode materials are graphite plates, and the reactor chamber is divided into an anode chamber 1 and a cathode chamber 2 by a cation exchange membrane 5; the bottom of the cathode chamber 2 is provided with an air inlet pipe 6 and an aeration sieve plate connected with the air inlet pipe 6, the top of the cathode chamber 2 is provided with a tail gas exhaust pipe 7, and the top of the anode chamber 1 is provided with an anode exhaust pipe 8; the cathode chamber 2 is provided with a liquid outlet 9 and a liquid inlet 10 for liquid to enter and exit, is connected with a vertical flow sedimentation/circulation groove 15 through a circulation pump II 16 and is used for the circulation of liquid and the sedimentation separation of solid; the anode chamber 1 is also provided with a liquid outlet 9 and a liquid inlet 10 for liquid to enter and exit, and is connected with an anode circulating tank 13 through a circulating pump I14 for liquid circulation.
During the treatment, CO2The trapping rate can reach more than 85 percent, and the NaHCO containing solid slurry separated in the vertical flow precipitation/circulation tank 153The purity of the sodium bicarbonate is 99 percent, and the sodium bicarbonate can be directly used as a desulfurizing agent or used for producing solid sodium bicarbonate after drying treatment.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention, and therefore, the scope of the present invention shall be subject to the claims.
Claims (7)
1. A method for preparing sodium bicarbonate by electrochemically capturing carbon dioxide is characterized by comprising the following steps: the reaction chamber is divided into an anode chamber and a cathode chamber by a cation exchange membrane, direct current voltage is applied to the electrodes, the desulfurization product solution is positioned in the anode chamber and is driven by an electric field and acted by the ion exchange membraneNa is added+Entering a cathode chamber to generate NaOH; CO-containing gas to be captured2Gas is introduced from the cathode chamber, absorbed by NaOH and converted into desulfurizing agent NaHCO3。
2. The method for preparing sodium bicarbonate by electrochemically capturing carbon dioxide according to claim 1, characterized in that: the desulfurization product is NaHSO4、Na2SO4、Na2SO3、NaHSO3And the like, sulfate and sulfite ions.
3. The method for preparing sodium bicarbonate by electrochemically capturing carbon dioxide according to claim 1, characterized in that: the cation exchange membrane is a conventional membrane with cation selectivity of 98%.
4. The method for preparing sodium bicarbonate by electrochemically capturing carbon dioxide according to claim 1, characterized in that: the cathode chamber is a sodium hydroxide solution with the initial concentration of 0.05-2 mol/L.
5. The method for preparing sodium bicarbonate by electrochemically capturing carbon dioxide according to claim 1, characterized in that: said CO-containing2The gas is flue gas after dust removal, desulfurization and denitrification, and CO2The content is 5-40%.
6. The method for preparing sodium bicarbonate by electrochemically capturing carbon dioxide according to claim 1, characterized in that: the current density range is 30-1000 mA/m2And the specific value is regulated by taking the pH value of the circulating liquid in the cathode chamber as an index, so that the pH value is kept in a range of 7-9, the current density is increased when the pH value is too low, and otherwise, the current density is reduced.
7. An apparatus for preparing sodium bicarbonate by electrochemically capturing carbon dioxide, is characterized in that: comprises a reactor, an anode electrode, a cathode electrode, a cation exchange membrane and a power supply; the anode and the cathode are respectively arranged at two ends of the reactor and are connected with a power supply through leads, and the cation exchange membrane divides the reactor chamber into an anode chamber and a cathode chamber; the bottom of the cathode chamber is provided with an air inlet pipe and an aeration sieve plate connected with the air inlet pipe, the top of the cathode chamber is provided with a tail gas exhaust pipe, and the top of the anode chamber is provided with an anode exhaust pipe; the anode chamber and the cathode chamber are both provided with a liquid outlet and a liquid inlet for liquid to enter and exit and are used for liquid circulation.
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| CN114645290A (en) * | 2022-02-25 | 2022-06-21 | 东南大学 | CO (carbon monoxide)2Trapping and electric regeneration synchronous conversion system and method |
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