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An electrochemical method for the preparation of fumaric acid by cis-trans isomerization of maleic acid

A technology of cis-trans isomerization and maleic acid, which is applied in the field of fumaric acid preparation, can solve the problems of large amount of catalyst, excessive ammonia nitrogen, large amount of waste water, etc., and achieve good environmental protection benefits, environmentally friendly production process, good economic benefits and The effect of social benefits

Inactive Publication Date: 2016-06-29
HUAIBEI NORMAL UNIVERSITY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above methods more or less have problems such as large amount of catalyst, corrosion of equipment, large amount of waste water and excessive ammonia nitrogen.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Present embodiment prepares fumaric acid as follows:

[0020] The electrolytic cell is made of plexiglass, and the cathode chamber and the anode chamber are separated by a cation exchange membrane. Both the anode and the cathode use graphite electrodes, and the effective areas of the cathode and the anode are each 200cm 2 , the distance between cathode and anode is 1.5cm.

[0021] Take maleic acid as the solute and water as the solvent to prepare a maleic acid solution with a mass percentage concentration of 30%; add 2000ml of maleic acid solution to the cathode chamber and the anode chamber respectively as the electrolyte, and electrolyze in the anode chamber under constant stirring Add sodium bromide to the solution until the mass percent concentration of sodium bromide is 0.9%, set the temperature of the electrolyte to 30°C, and control the current density to 0.05A / cm 2 , after 1.5 hours of electrolysis, remove the electrolyte solution in the cathode and anode chamb...

Embodiment 2

[0025] The initial composition of the electrolytic cell and electrolyte of this embodiment is the same as that of Example 1. The temperature of the electrolyte is set to 50°C under constant stirring, and the constant voltage is controlled to be 5.0V. After 1.5 hours of electrolysis, the cathode chamber electrolyte and the anode chamber The electrolyte is removed separately;

[0026] Cool and crystallize the anolyte at room temperature, filter to separate the solid from the liquid, and dry the solid product at 120°C until the water content is not higher than 0.5%, to obtain fumaric acid; the yield of fumaric acid is 86%;

[0027] Cool and crystallize the cathodic electrode solution at room temperature, and filter to separate the solid and liquid, and dry the solid product at 120°C until the water content is not higher than 0.5%, to obtain succinic acid; the yield of succinic acid is 64%.

[0028] The filtrate obtained after filtering the anolyte can be reused in the preparation...

Embodiment 3

[0030] The electrolytic cell of this embodiment is the same as that of Embodiment 1, and the concentration of the maleic acid solution in the electrolyte is 10%. Under constant stirring, sodium bromide is added to the electrolyte solution in the anode chamber until the mass percentage concentration of sodium bromide is 0.1%. The temperature of the electrolyte is 80°C, and the constant voltage is controlled at 0.8V. After 2.0 hours of electrolysis, the electrolytes in the two electrode chambers are removed separately;

[0031] Cool and crystallize the anolyte at room temperature, filter to separate the solid from the liquid, and dry the solid product at 130°C until the water content is not higher than 0.5%, to obtain fumaric acid; the yield of fumaric acid is 79%;

[0032] Cool and crystallize the cathodic electrode solution at room temperature, and filter to separate the solid from the liquid. Dry the solid product at 130°C until the water content is not higher than 0.5% to obt...

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PUM

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Abstract

The invention discloses an electrochemical process for preparing fumaric acid employing maleic acid cis-trans isomerization. The electrochemical process is characterized by comprising the following steps: obtaining fumaric acid by taking a maleic acid solution as a raw material through the electrochemical process; partitioning an electrolytic cell into a cathode chamber and an anode chamber by adopting an ion exchange membrane, wherein electrolyte of the cathode chamber and the anode chamber is the maleic acid solution; adding sodium bromide to the electrolyte of the anode chamber; setting the temperature of the electrolyte at 25-85 DEG C, controlling the current density at 0.01-0.2A / cm<2> or constant pressure at 0.5-6.0V; and cooling, crystallizing, filtering and drying an anode electrolyte to obtain the fumaric acid after electrolyzing for 1-2 hours. By adopting the method disclosed by the invention, a nitrogen-containing compound is not added, the wastewater after solid-liquid separation can be recycled, a water resource can be efficiently utilized, and the problem that ammonia nitrogen of the fumaric acid wastewater exceeds the standard can be overcome from a source. Thus, the electrochemical process is a green production technology worthy of the name.

Description

technical field [0001] The invention relates to a method for preparing fumaric acid, more precisely, a method for isomerizing maleic acid into fumaric acid in cis and trans isomerization using electrochemical principles. Background technique [0002] Fumaric acid, also known as fumaric acid and fumaric acid, is an important platform organic acid intermediate, which can synthesize a series of valuable chemical products, such as aspartic acid, polyester resin and alkyd resin, etc. , it is also an important food additive, which can be used for food preservation, seasoning, acidification, flavoring, etc.; therefore, it has received much attention. For a long time, domestic and foreign scholars have carried out in-depth and meticulous research on the preparation of fumaric acid, and found many preparation methods, the most effective of which is the catalytic isomerization of maleic acid. There are many isomerization catalysts that can convert maleic acid into fumaric acid, such ...

Claims

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Application Information

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IPC IPC(8): C25B3/06
Inventor 王永秋吴金城刘勇付慧张培红
Owner HUAIBEI NORMAL UNIVERSITY
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