Electrochemical reduction method and apparatus for carbonic anhydride in ionic liquid

Abstract

The invention relates to an electrochemical reducing method of carbon dioxide in ionic liquid and an electrochemical reducing device. The method comprises following steps: injecting ionic liquid in a cathode chamber in the electrochemical reducing device, inputting the carbon dioxide, inputting hydrogen on the inner side of an anode bipolar plate, oxidizing the hydrogen on an anode, generating hydrogen ions, enabling H+ to traverse through proton exchange membrane to reach a cathode, transmitting electrons to the cathode through an external circuit, enabling the carbon dioxide and the H+ to generate electrochemical reduction reaction on the cathode, generating organic compound such as carbinol and the like, and obtaining the carbinol, water and other secondary reaction products through distilling the organic compound which is generated. The ionic liquid of the invention has very high electrical conductivity and ion mobility, the ionic liquid is suitable to be used as a media system of electrochemical reaction, simultaneously, the ionic liquid has the advantages of low volatility and small toxicity, competitive reaction of the H+ is inhibited, since the solubility of the carbon dioxide in the ionic liquid is very high, the efficiency of the electrochemical reduction reaction of the carbon dioxide is also comparatively high, and the electrochemical method of the invention utilizes CO2 to generate the organic compounds such as the carbinol and the like (by products are aminic acid, formaldehyde and the like), which realizes the resource utilization of the CO2.

Description

technical field [0001] The invention relates to an electrochemical reduction method and device for carbon dioxide in ionic liquid. Background technique [0002] The electrochemical conversion of carbon dioxide into organic compounds such as methanol is an important way to realize the resource utilization of carbon dioxide. The electrochemical reduction reaction of carbon dioxide can be carried out in aqueous solution or non-aqueous system[1]. In aqueous solution, the main problems encountered in the electroreduction reaction of carbon dioxide are: ① the current efficiency of electroreduction reaction of carbon dioxide is low; ② the solubility of carbon dioxide in aqueous solution is too low. In non-aqueous solvents, the main problems encountered in the electrochemical reduction reaction of carbon dioxide: 1. three commonly used organic solvents (acetonitrile, dimethylformamide and dimethyl sulfoxide) are volatile and have toxic side effects; The electrochemical properties o...

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Problems solved by technology

In aqueous solution, the main problems encountered in the electroreduction reaction of carbon dioxide are: ① the current efficiency of the electroreduction reaction of carbon dioxide is low; ② the solubility of carbon dioxide in aqueous solution is too low

In non-aqueous solvents, the main problems encountered in the electrochemical reduction reaction of carbon dioxide: 1. three commonly used organic solvents (acetonitrile, dimethylformamide and dimethyl sulfoxide) are volatile and have toxic side effects; The electrochemical properties of the above three organic solvents have a great influence. The solvents need to be refined before use, and the water in the solvent must be removed. However, water is generated during the electrochemical reduction reaction of carbon dioxide.

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