Preparation gas recycling device for preparing formic acid by electrolyzing carbon dioxide

Abstract

The invention discloses a preparation gas recycling device for preparing formic acid by electrolyzing carbon dioxide. A preparation gas recycling gas inlet top cylinder assembly, a first-stage prepared gas combustion-supporting treatment assembly, a first-stage water vapor absorption filtering assembly, a second-stage prepared gas combustion-supporting treatment assembly, a second-stage water vapor absorption filtering assembly and a prepared gas recycling gas outlet bottom cylinder assembly form a multi-stage tower type prepared gas treatment and recycling structure. A recycling gas outlet flange at the bottom of the prepared gas recycling gas outlet bottom cylinder assembly communicates with a raw material gas inlet pipeline for preparing formic acid through electrolysis of carbon dioxide through an exhaust fan and a circulating pipeline. Through the action of the exhaust fan, a negative pressure gas flow guide structure circulating downwards is formed in the multi-stage tower type prepared gas treatment and recycling structure. Carbon monoxide and methane discharged from a cathode gas outlet are combusted at the top of a prepared gas combustion-supporting treatment cylinder through cooperation of a combustion-supporting gas inlet pipe and an ignition igniter, and high-temperature water vapor and carbon dioxide gas are formed after combustion of the carbon monoxide and the methane.

Description

technical field [0001] The invention belongs to the technical field of producing formic acid by electrolysis of carbon dioxide, and in particular relates to a gas reutilization device for producing formic acid by electrolysis of carbon dioxide. Background technique [0002] Formic acid is one of the basic organic chemical raw materials. It is widely used in pesticides, leather, dyes, medicine and rubber industries. Formic acid can be directly used in fabric processing, leather tanning, textile printing and dyeing and green fodder storage, and can also be used as a metal surface treatment agent. , rubber additives and industrial solvents, used in the synthesis of various formic acid esters, acridine dyes and formamide series pharmaceutical intermediates in organic synthesis. [0003] The following problems exist in the prior art: in aqueous solution, carbon dioxide is catalytically reduced to formic acid by electrochemical means. The reaction principle is that water oxidizes ...

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Problems solved by technology

[0003] The following problems exist in the prior art: in aqueous solution, carbon dioxide is catalytically reduced to formic acid by electrochemical means. The reaction principle is that water oxidizes on the anode to generate hydrogen ions and oxygen, and the hydrogen ions migrate to the formic acid through the mass transfer process. The cathode participates in the carbon dioxide electrocatalytic reduction reaction on the cathode to generate formic acid and side reaction products. The gas discharged from the cathode outlet of the electrolytic carbon dioxide to form formic acid contains a small amount of carbon monoxide and methane. If the carbon monoxide and methane are directly discharged to the outside, on the one hand It will cause pollution, and on the other hand, it will cause waste of resources. In the process of producing formic acid by electrolysis, carbon dioxide is used as the raw material. Carbon dioxide as the raw material for electrolysis can be obtained by burning carbon monoxide and methane. Therefore, there is an urgent need for a preparation gas for the production of formic acid by carbon dioxide electrolysis for reuse. device to solve the above problems

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