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Method for promoting electrochemical trapping of low-concentration CO2 through membrane electrolysis

A low-concentration, membrane electrolysis technology, applied in chemical instruments and methods, separation methods, separation of dispersed particles, etc., can solve the problem of high theoretical power consumption

Active Publication Date: 2018-10-12
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the traditional electrolysis process must generate H 2 and O 2 To realize the whole reaction process, the theoretical power consumption of the process is as high as 6.048GJ / t-CO 2

Method used

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  • Method for promoting electrochemical trapping of low-concentration CO2 through membrane electrolysis
  • Method for promoting electrochemical trapping of low-concentration CO2 through membrane electrolysis
  • Method for promoting electrochemical trapping of low-concentration CO2 through membrane electrolysis

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0061] The cation exchange membrane Nafion115 membrane is placed in the electrolyzer and the electrolyzer is divided into a cathode area and an anode area, and the anolyte (1M (NH 4 ) 2 SO 4 +1MNH 4 HCO 3 ) and catholyte (1M(NH 4 ) 2 SO 4 ) is placed in a 200mL airtight storage tank, and the pump circulates between the electrolyzer device and the storage tank at a flow rate of 20mL / min, and 10mL / min of H is introduced into the anode area 2 . A DC power supply was applied between the anode electrode and the cathode electrode, the electrolysis reaction was powered by an external DC power supply (IT6932A, Itech), and the temperature of the electrolytic cell was 50°C.

[0062] Set the current density to 40mA / m 2 , and constantly monitor and record the voltage change law of the electrolyzer. During the electrolysis process, 20mL / min of argon gas is passed into the anolyte storage tank to desorb the CO in the anolyte. 2 Carried to the gas chromatograph to verify that the d...

example 2

[0075] Anolyte (1.5M (NH 4 ) 2 SO 4 +1.5MNH 4 HCO 3 ) and catholyte (1.5M (NH 4 ) 2 SO 4 ) placed in a 200mL airtight storage tank, circulated between the electrolyzer device and the storage tank at a flow rate of 15mL / min through a pump, and 10mL / min of H 2 . A DC power supply was applied between the anode electrode and the cathode electrode, the electrolysis reaction was powered by an external DC power supply (IT6932A, Itech), and the temperature of the electrolytic cell was 55°C.

[0076] Set the current density to 20mA / m 2 , the electrolysis voltage at this time is 0.53V. Therefore, the calculation according to formula (7) shows that: adopting the scheme of this embodiment, theoretically, every ton of CO captured electrochemically 2 The energy consumption is only 322.885kW h. During the electrolysis process, 20mL / min of argon gas is passed into the anolyte storage tank to desorb the CO in the anolyte. 2 Carried to the gas chromatograph to verify that the desorb...

example 3

[0079] Anolyte (2M(NH 4 ) 2 SO 4 +2MNH 4 HCO 3 ) and catholyte (2M(NH 4 ) 2 SO 4 ) is placed in a 200mL closed storage tank, and the pump circulates between the electrolyzer device and the storage tank at a flow rate of 10mL / min, and 15mL / min of H 2 . A DC power supply was applied between the anode electrode and the cathode electrode, the electrolysis reaction was powered by an external DC power supply (IT6932A, Itech), and the temperature of the electrolytic cell was 45°C.

[0080] Set the current density to 10mA / m 2 , the electrolysis voltage at this time is 0.45V. Therefore, the calculation according to formula (7) shows that: adopting the scheme of this embodiment, theoretically, every ton of CO captured electrochemically 2 The energy consumption is only 274.148kW h. During the electrolysis process, 20mL / min of argon gas is passed into the anolyte storage tank to desorb the CO in the anolyte. 2 Carried to the gas chromatograph to verify that the desorbed CO 2 ...

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Abstract

The invention provides a method for promoting electrochemical trapping of low-concentration CO2 through membrane electrolysis and belongs to the technical field of electrochemical trapping of CO2. Themethod comprises the steps: placing a cation exchange membrane in an electrolytic bath to divide the electrolytic bath into an anode region and a cathode region, adding a NH4HCO3 solution into the anode region, introducing the low-concentration CO2 into the cathode region, and applying a direct-current power supply between an anode electrode and a cathode electrode; subjecting H<+> generated fromwater ionization to a reaction with NH4HCO3 in anolyte under the action of electric current so as to release high-purity CO2 and meanwhile produce NH<4+>; and enabling the NH<4+> to penetrate throughthe cation exchange membrane, reach the cathode region and be combined with OH<->generated from water ionization so as to produce NH3.H2O and trap and absorb the low-concentration CO2, and recyclingproduced NH4HCO3 to the anode region. When current density is maintained to 40mA / cm<2>, an initial voltage of the method provided by the invention is only 0.61V, and the actual energy consumption fortrapping a ton of CO2 is 1.575GJ which is only equivalent to 45% the energy consumption of the traditional MEA chemical absorption method.

Description

technical field [0001] The invention belongs to the electrochemical capture of CO 2 Technical field, specifically a kind of membrane electrolysis to promote low-concentration CO 2 method of electrochemical capture. Background technique [0002] For a long time, the extensive use of fossil fuels has caused global CO 2 rapid growth in emissions. According to a report released by the International Energy Agency (IEA), CO emissions from fossil fuel combustion in the atmosphere in 2011 2 From 1.4×104Mt in the early 1970s to 3.1×104Mt. "BP 2030 World Energy Outlook" predicts that global energy demand will increase by 36% between 2011 and 2030, CO 2 Emissions will further increase, CO 2 Emission reduction is not only a scientific problem faced by mankind, but also a major issue related to human survival and development. [0003] In the coming years, energy will still be obtained mainly from fossil fuels. Especially in a long period of time in the future, my country will con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/32B01D53/14
CPCB01D53/1425B01D53/1475B01D53/1493B01D53/326B01D2252/10
Inventor 王昱飞谢和平刘涛
Owner SICHUAN UNIV
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