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Method for preparing formic acid by bipolar membrane electrodialysis

A bipolar membrane electrodialysis, bipolar membrane technology, used in the preparation of carboxylate, organic chemistry, etc.

Inactive Publication Date: 2018-10-23
HEFEI CHEMJOY POLYMER MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Run until the conductivity of the acid chamber no longer drops to stop

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  • Method for preparing formic acid by bipolar membrane electrodialysis

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Embodiment 1

[0020] This embodiment adopts as figure 1 In the bipolar membrane electrodialysis device shown, the arrangement of the membrane stack is anode-anode chamber-cation exchange membrane-alkali chamber-bipolar membrane-[acid chamber-cation exchange membrane-alkali chamber-bipolar membrane] n -acid chamber-cation exchange membrane-cathode chamber-cathode, the number of repeating units n is 5. The material of the anode and cathode in the membrane stack is corrosion-resistant titanium coated with ruthenium. The compartments between adjacent ion exchange membranes include acid chambers and alkali chambers, which are composed of gaskets with flow channels and grids, and the thickness of the gaskets is 0.8mm. The cation exchange membrane used in the membrane stack is CMX produced by Japan Astom Company, the bipolar membrane is BP-1E produced by Japan Astom Company, and the effective area of ​​a single membrane is 189cm 2 (9cm×21cm).

[0021] The anode chamber and the cathode chamber a...

Embodiment 2

[0024] The bipolar membrane electrodialysis device used in this embodiment is the same as that in Embodiment 1.

[0025] The anode chamber and the cathode chamber are connected in series, and 500mL 0.1mol / L Na 2 SO 4 The aqueous solution is used as a strong electrolyte, 500mL of 0.01mol / L NaOH solution is passed into the alkali chamber, and 1000mL of 1mol / L NaCOOH solution is passed into the acid chamber. During the experiment, the linear flow velocity of each compartment solution flowing in the membrane stack was 4cm / s, and the upper limit of the current density was set to 40mA / cm 2 , the upper limit of the membrane stack voltage is set to 20V to avoid damage to the membrane stack under high voltage.

[0026] The experiment runs until the conductivity of the acid chamber no longer decreases, the Na ion content in the acid chamber can be reduced to 0.007mol / L, the conversion rate is 99.3%, and the concentration of formic acid can reach 1.06mol / L at the same time, because the...

Embodiment 3

[0028] The bipolar membrane electrodialysis device used in this embodiment is the same as that in Embodiment 1.

[0029] The anode chamber and the cathode chamber are connected in series, and 500mL 0.1mol / L Na 2 SO 4 The aqueous solution is used as a strong electrolyte, 1000mL 0.01mol / L NaOH solution is passed into the alkali chamber, and 1000mL 3mol / L NaCOOH solution is passed into the acid chamber. During the experiment, the linear flow velocity of each compartment solution flowing in the membrane stack was 4cm / s, and the upper limit of the current density was set to 60mA / cm 2 , the upper limit of the membrane stack voltage is set to 20V to avoid damage to the membrane stack under high voltage.

[0030] The experiment runs until the conductivity of the acid chamber no longer drops, the Na ion content in the acid chamber can be reduced to 0.04mol / L, the conversion rate is 98.7%, and the concentration of formic acid can reach 3.65mol / L at the same time, because the volume of...

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Abstract

The invention discloses a method for preparing formic acid by bipolar membrane electrodialysis. The method is characterized in that sodium formic acid is converted into the formic acid by bipolar membrane electrodialysis, and the byproduct of sodium hydroxide with high added value is obtained and is recycled for the previous procedures; the content of sodium ions in the sodium formic acid is reduced to be lower than 0.05mol / L in the process, and the conversion rate reaches 98% or above. The preparation method has the advantages that the operation is simple, the consumption of any chemical reagent is avoided, and the consumption of sulfuric acid and the production of byproduct of sodium sulfate in the traditional technology are avoided; when the formic acid is prepared by bipolar membrane electrodialysis, the economic, green and environment-friendly effects are realized, and the important industrialized application value is realized.

Description

technical field [0001] The invention belongs to the technical field of organic acid production, and in particular relates to a method for preparing formic acid through bipolar membrane electrodialysis. Background technique [0002] Formic acid is one of the basic organic chemical raw materials, widely used in pharmaceutical, pesticide, chemical, leather, dye and rubber industries. And the preparation method of formic acid has a lot, available methyl performate hydrolysis makes (CN1618784A), also can make (CN204874348U) by sodium formate acidification. However, sodium formate often exists in the by-products of many chemical companies, and the output is also very large. For example, my country is a large country of yellow phosphorus production, and a large amount of sodium formate (CN204874348U) will be produced by-product in the production of yellow phosphorus; in the production of pentaerythritol and neopentyl glycol, a large amount of sodium formate (CN204874348U and CN125...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/02C07C53/02
CPCC07C51/02C07C53/02
Inventor 汪耀明颜海洋王晓林李为李传润吴亮徐铜文张勤
Owner HEFEI CHEMJOY POLYMER MATERIALS CO LTD
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