Apparatus and method for producing acetic acid by reducing carbon dioxide through microbial-electrochemical system

A microbial electrochemistry, carbon dioxide technology, applied in biochemical equipment and methods, methods of stress stimulating microbial growth, biochemical instruments, etc. The rate of acetic acid, the rate of reduction to acetic acid, and the effect of improving the mass transfer rate

Active Publication Date: 2015-02-04
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limited solubility of carbon dioxide in the solution and the reduction of carbon dioxide to acetic acid, a certain energy barrier needs to be overcome, which affects the efficiency of microbial electrochemical fixation of carbon dioxide and limits the further development and application of microbial electrochemical fixation of carbon dioxide to produce chemicals.

Method used

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  • Apparatus and method for producing acetic acid by reducing carbon dioxide through microbial-electrochemical system
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  • Apparatus and method for producing acetic acid by reducing carbon dioxide through microbial-electrochemical system

Examples

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Embodiment 1

[0035]This example illustrates the specific structure, application method and working principle of a microbial electrochemical system reducing carbon dioxide to produce acetate according to the present invention.

[0036] 1. Construction of microbial electrochemical reaction device.

[0037] Such as figure 1 As shown, a bioelectrochemical system for reducing carbon dioxide to produce acetic acid is mainly composed of 1-power supply; 2-anolyte outlet; 3-catholyte outlet; 4-gas outlet; 5-gas inlet; 6-anode; 7- Diaphragm, 8-gas diffusion cathode, 9-anolyte inlet, 10-catholyte inlet, 11-anode chamber, 12-catholyte chamber, 13cathode gas chamber. The anode 6 is connected to the anode chamber 11, the diaphragm 7 is located between the cathode 8 and the anode 6, the power source 1 connects the anode 6 and the cathode 8 to form a loop, and the cathode 8 separates the cathode chamber into a catholyte chamber 12 and a cathode gas chamber 13. The cathode 8 has one side rich in catalyst...

Embodiment 2

[0053] A method for producing acetate by reducing carbon dioxide in a microbial electrochemical system

[0054] The construction of the microbial electrochemical reaction device and the biofilm hanging on the cathode are the same as in Example 1, wherein the preparation of the gas diffusion cathode is as follows:

[0055] (1) Soak the carbon cloth in an aqueous solution of 5wt% polytetrafluoroethylene, and treat it at 380°C for 3 hours to make the carbon cloth hydrophobic;

[0056] (2) Ultrasonic mixing of carbon black, water, ethanol, and polytetrafluoroethylene emulsion at a mass ratio of 1:3:10:5, and the obtained mixture is applied to the side of the electrode surface close to the cathode gas chamber, and heated at 380°C Treat for 0.5h under the same conditions to prepare the electrode diffusion layer;

[0057] (3) On the electrode diffusion layer obtained in step (2), apply an aqueous solution of 30wt% polytetrafluoroethylene as a waterproof layer, and treat it at 380°C ...

Embodiment 3

[0062] A method for producing acetate by reducing carbon dioxide in a microbial electrochemical system

[0063] The construction of the microbial electrochemical reaction device and the method of hanging biofilm on the cathode are the same as in Example 1, the selection of acetic acid bacteria (Sporomusa sphaeroides Moeller ATCC 35900), wherein the preparation of the gas diffusion cathode is as follows:

[0064] (1) Soak the carbon cloth in an aqueous solution of 5wt% polytetrafluoroethylene, and treat it at 380°C for 4 hours to make the carbon cloth hydrophobic;

[0065] (2) Ultrasonic mixing of carbon black, water, ethanol, and polytetrafluoroethylene emulsion at a mass ratio of 0.2:5:15:10, and the obtained mixture is applied to the side of the electrode surface close to the cathode gas chamber, and heated at 380°C Under the condition of treatment for 1h, the electrode diffusion layer was prepared;

[0066] (3) On the electrode diffusion layer obtained in step (2), apply a...

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Abstract

The invention provides an apparatus and a method for producing acetic acid by reducing carbon dioxide through a microbial-electrochemical system. The apparatus includes an anode chamber and a cathode chamber, wherein the anode chamber and the cathode chamber separated by a separator. An anode is arranged inside the anode chamber and a cathode is arranged inside the cathode chamber. The anode and the cathode are connected in series outside the anode chamber and the cathode chamber through a power supply to form a loop. The cathode divides the cathode chamber into a cathode liquid chamber and a cathode gas chamber and is a gas diffusion electrode. The invention also discloses a method for producing acetic acid by reducing carbon dioxide through the apparatus. In the invention, the cathode is in the structure of a gas diffusion electrode so that a mass transfer rate and a catalytic rate of carbon dioxide in an electrochemical reaction. An acetic acid generating rate is higher. The apparatus and the method have an important application prospect in fixation and conversion of carbon dioxide.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of carbon dioxide, and in particular relates to a method for producing acetate by reducing carbon dioxide in a microbial electrochemical system. Background technique [0002] As the gas with the greatest impact on the greenhouse effect, carbon dioxide is also the most abundant carbon resource on earth. The fixation and recycling of carbon dioxide are of great significance to the environment, energy and resources. The basic principle of the method of microbial fixation of carbon dioxide is to use photosynthetic microorganisms to carry out photosynthesis to fix carbon dioxide emitted by thermal power plants and other release sources. The advantages of this method mainly lie in that compared with the carbon dioxide fixation method of higher plants, microorganisms have many advantages such as rapid reproduction, high carbon dioxide fixation efficiency, suitability for industrialized inte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12M1/42C12P7/54
CPCC12M21/12C12M45/07C12P7/54C25B3/25Y02P20/141
Inventor 谢婧婧宋天顺王德斌王桂兰
Owner NANJING UNIV OF TECH
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