Method for electrolytic synthesis of butanedioic acid and fixed bed electrochemical reaction device

A technology for electrolytic synthesis and succinic acid, applied in electrolysis process, electrolysis components, electrolysis organic production, etc., can solve the problems of high investment in production equipment, low electrolysis time-space yield, dripping and other problems, so as to improve cathode utilization rate and reduce electrolysis efficiency. Energy consumption and the effect of reducing side reactions

Active Publication Date: 2015-09-30
ZHEJIANG UNIV OF TECH
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Problems solved by technology

[0005] In order to solve the problems of high production equipment investment, low electrolytic space-time yield, and serious dripping phenomenon in the current production of succinic acid, the present invention proposes a method for electrolytically synthesizing succinic acid and its fixed-bed electrochemical reaction device

Method used

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  • Method for electrolytic synthesis of butanedioic acid and fixed bed electrochemical reaction device
  • Method for electrolytic synthesis of butanedioic acid and fixed bed electrochemical reaction device
  • Method for electrolytic synthesis of butanedioic acid and fixed bed electrochemical reaction device

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Embodiment 1

[0032] Example 1 450 g of electrolyte was prepared with deionized water. The initial composition of the electrolyte was 9.8% maleic anhydride mass concentration and 8% sulfuric acid mass concentration. The temperature of the electrolyte is controlled at 50°C; the diameter of the cathode filled titanium pellets is 8mm; the anode current density is 1000A / m 2 , J 阳 / J 阴 =4:1; the electrolysis current flow is 100% of the theoretical electricity. At the beginning of electrolysis, the prepared electrolyte is fed from the high-level liquid storage tank to the circulation tank, and the electrolyte is formed into a closed loop through the magnetic circulation pump. When the temperature is controlled at 50°C, the electrolysis starts. After the electrolysis, the electrolysis solution was placed in the refrigerator, crystallized at 0°C for 75 minutes, filtered, and dried to obtain 38.88g of succinic acid crystals, the purity of succinic acid was 99.68%, the melting point was 184.3°C, an...

Embodiment 2

[0034] The electrolysis device, electrolysis method, electrolysis temperature, current density, initial composition and quality of the electrolyte are the same as in Example 2, and the diameter d of the titanium pellet cathode is 10mm. After the electrolysis, the electrolysis solution was placed in the refrigerator, crystallized at 0°C for 75 minutes, filtered, and dried to obtain 34.42g of succinic acid crystals, the purity of succinic acid was 99.71%, the melting point was 184.6°C, and the electrolysis voltage was 2.7–3.1V. The current efficiency is 64.4%, and the reduction yield of succinic acid is 64.8%.

Embodiment 3

[0036] The electrolysis device, electrolysis method, electrolysis temperature, current density, initial composition and quality of the electrolyte are the same as in Example 2, and the diameter d of the titanium pellet cathode is 6mm. After the electrolysis, the electrolysis solution was placed in the refrigerator, crystallized at 0°C for 75 minutes, filtered, and dried to obtain 39.38g of succinic acid crystals, the purity of succinic acid was 99.57%, the melting point was 184.7°C, and the electrolysis voltage was 2.6–3.0V. The current efficiency is 73.6%, and the reduction yield of succinic acid is 74.2%.

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Abstract

The invention provides a method for electrolytic synthesis of butanedioic acid and a fixed bed electrochemical reaction device. The method comprises the following steps: by taking a maleic anhydride solution with the mass concentration of 5-20% and a sulfuric acid solution with the mass concentration of 3-15% as an electrolyte, introducing the electrolyte into a circulating tank by virtue of a liquid storage tank; inputting the electrolyte into an electrolytic tank by virtue of a magnetic circulating pump; controlling the temperature of the electrolytic tank to be 30-80 DEG C and the current density to be 200-1000A/m<2>, and electrifying for electrolysis; after reaction, discharging the obtained reaction solution from a liquid outlet of a three-way valve, and performing cooling crystallization on the electrolyte, filtration and drying to obtain butanedioic acid; and recovering the filtrate after filtering out butanedioic acid, adding an appropriate amount of raw materials of maleic anhydride and concentrated sulfuric acid to re-prepare the filtrate into an electrolyte for cycle use. The device comprises the electrolytic tank, the liquid storage tank, the circulating tank, the heat exchanger and the magnetic circulating pump. The method and the device provided by the invention have the beneficial effects of improving the productivity and achieving energy conservation and high efficiency.

Description

technical field [0001] The invention relates to a method for electrolytically synthesizing succinic acid and a fixed-bed electrochemical reaction device thereof. Background technique [0002] Succinic acid, also known as succinic acid, has the molecular formula C 4 h 6 o 4 , is an important raw material for organic synthesis, widely used in medicine, pesticides, synthetic polymer materials, photosensitive materials, food flavoring agents, etc. Accelerator, etc. With the successful development of biodegradable plastic polybutylene succinate (PBS) in recent years, it can be expected that the demand for succinic acid as the main raw material of PBS will increase sharply in the next few years. [0003] As a special chemical reactor, the electrochemical reactor can be divided into three categories according to the reactor structure: box-type electrochemical reactor, plate-and-frame electrochemical reactor, and special-structure electrochemical reactor. The box-type electroch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B3/04C25B3/25
Inventor 马淳安赵峰鸣侯庆龙
Owner ZHEJIANG UNIV OF TECH
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