Formic acid preparation method

A formic acid and carbonate technology, applied in the electrolysis process, electrolysis components, electrolysis organic production and other directions, can solve the problems of shortened life, decreased electrochemical reaction performance, and reduced product quality, etc., to achieve cost saving, wide application range, cleanliness The effect of production costs

Active Publication Date: 2018-08-10
BEIJING FUMEIJIA ENERGY TECH CO LTD
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Problems solved by technology

Not only that, in the case of continuous input of acid and alkali as raw materials, some impurities entrained in the raw material alkali will gradually accumulate in the electrochemical reactor, resulting in a decrease in electrochemical reaction performance and shortened life, while the raw material alkali Part of the impurities entrained and some impurities entrained in the raw acid will also be mixed into the product formic acid or formate, thereby reducing the quality of the product

Method used

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preparation example Construction

[0068] The invention provides a kind of preparation method of formic acid, comprises the steps:

[0069] The bicarbonate solution or carbonate solution is mixed with carbon dioxide and passed into the cathode chamber of the electrochemical reactor, and the strong alkali solution is passed into the anode chamber of the electrochemical reactor to carry out the electrochemical reaction;

[0070] The product of the cathode chamber is separated through a cathode gas-liquid separator to separate carbon dioxide and formate;

[0071] The formate produces formic acid and strong alkali solution through a bipolar membrane electrodialysis reactor;

[0072] Wherein, the separated carbon dioxide is recycled to the cathode chamber for use, and the strong alkali solution produced by the bipolar membrane electrodialysis reactor is recycled to the anode chamber for use.

[0073] Specifically, the bicarbonate solution or the carbonate solution is used as a buffer solution during start-up, and t...

Embodiment 1

[0090] figure 1 It is a schematic diagram of a device for preparing formic acid in Example 1 of the present invention. Such as figure 1 As shown, the device includes: electrochemical reactor R1, bipolar membrane electrodialysis reactor R2, gas-liquid mixer MIX1, anode tank T2, anode pump P2, strong alkali circulation pump P3, formate solution circulation pump P4, Cathode gas-liquid separator SP1, anode gas-liquid separator SP2, adsorption-desorption device SP3, cathode tank supply and drainage pipeline 1, raw carbon dioxide pipeline 2, anode tank water supply pipeline 3, cathode feed pipeline 4, anode feed pipeline 5 , Anode discharge pipeline 6, cathode discharge pipeline 7, SP2 liquid circulation pipeline 8, oxygen product pipeline 9, SP1 gas outlet pipeline 10, SP1 liquid outlet pipeline 11, SP3 carbon dioxide circulation pipeline 13, formic acid product pipeline 15, formate Solution circulation pipeline 16, strong alkali solution circulation pipeline 17, SP4 carbon dioxi...

Embodiment 2

[0100] Formic acid prepared by the method of Example 1, its final product formic acid may be mixed with carbon dioxide gas. Such as figure 2 shown in figure 1 On the basis of the shown device, a formic acid circulation line 14 and a formic acid circulation pump P5 are added, and a part of the formic acid produced by the electrodialysis unit is circulated to the cathode outlet pipeline 7 of the electrochemical reactor, and the sodium bicarbonate in the cathode product is converted into sodium formate, releasing Carbon dioxide to improve the formate purity of the feed to the electrodialysis unit. Ultimately improve the quality of formic acid products. Through liquid chromatography analysis, the mass percentage concentration of the formic acid product prepared by the method is 8%-30%.

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Abstract

The invention provides a formic acid preparation method. The formic acid preparation method comprises the steps that a bicarbonate solution or carbonate solution is mixed with carbon dioxide to be ledinto a cathode chamber of an electrochemical reactor, a strong base solution is led into an anode chamber of the electrochemical reactor, and an electrochemical reaction is carried out; a product ofthe cathode chamber is separated through a cathode gas-liquid separator, and carbon dioxide and formate are separated out; the formate generates formic acid and a strong base solution through a bipolar membrane electrodialysis reactor; and the separated-out carbon dioxide is circulated to the cathode chamber to be used, and the strong base solution generated by the bipolar membrane electrodialysisreactor is circulated to the anode chamber to be used. An acid-base reproducible and circulated closed loop route in the intermediate reaction process is constructed, other alkaline or salt matter does not need to be guided in successively during reaction, clean production is achieved, and the economic benefit is high. By means of the method, environment protection and carbon dioxide industrial large-scale recycling can be achieved.

Description

technical field [0001] The invention relates to the technical field of chemistry-energy saving and emission reduction, in particular to a method for preparing formic acid. Background technique [0002] The conversion of carbon dioxide into formic acid by electrochemical methods is one of the important ways to reduce carbon dioxide emissions and reuse resources. There are many ways to synthesize formic acid by the electrochemical reduction of carbon dioxide. At present, the more developed methods mainly include three-compartment pool and two-compartment pool. The three-chamber pool route can be the synthesis process of two membranes and three chambers (Electrochemical conversion of CO 2 to formic acid utilizing Sustainion TM membranes, Journal of CO 2 Utilization, 20(2017) 208–217) is a representative, and the two-chamber pool route can be represented by the single-membrane two-chamber synthesis process (Chinese patent CN103233240A) disclosed by Canada Mandela Energy Alte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B3/04C25B15/08C25B3/25
CPCC25B15/08C25B3/25
Inventor 陶耀光张红飞汪秀萍康鹏
Owner BEIJING FUMEIJIA ENERGY TECH CO LTD
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