Technique and device for non-membrane electrolytic synthesis of butanedioic acid

A technology of electrolytic synthesis and succinic acid, which is applied in the direction of electrolysis process, electrolysis components, electrolysis organic production, etc., can solve the problems of anode material consumption and large investment, high content of easy oxides, and difficulty in large-scale production, etc., to improve conversion The effect of high efficiency and anode usage efficiency, high product quality, and easy mass production

Inactive Publication Date: 2008-01-09
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] An object of the present invention is to solve the disadvantages of low utilization rate of the anode of the existing single cathode electrolysis device, short anode service life, large consumption and investment of anode material, poor product quality (high content of easy oxides), and difficulty in large-scale production. Provide a double-cathode electrolytic synthesis of succinic acid device with long anode service life, high utilization rate and higher conversion rate of maleic anhydride

Method used

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  • Technique and device for non-membrane electrolytic synthesis of butanedioic acid
  • Technique and device for non-membrane electrolytic synthesis of butanedioic acid

Examples

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Embodiment 1

[0038]A device for electrolytically synthesizing succinic acid without a diaphragm: the electrolytic cell includes an electrolytic cell body 1-01 formed by connecting 30 unit cells in series, an electrolytic cell body 1-02 formed by connecting 30 unit cells in series, and 30 units The electrolytic cell body 1-03 formed by connecting the cells in series, and the three sets of electrolytic cell bodies 1-01, 1-02, and 1-03 are connected in series, and the electrolytic cell body is divided into several unit cells by a separator 9 , the unit cell includes a cavity, a lead alloy double cathode 2, a titanium-iridium-tantalum oxide anode 3, and all the unit cells are connected in series; the cell cells of the electrolytic cell group 1-01 pass through their respective The electrolyte inlet 4 is communicated with the electrolyte distribution pipe 6, and the unit cells are communicated with the electrolyte collector 7 through their respective electrolyte outlets 5, and the electrolyte dis...

Embodiment 2

[0041] Replace the electrolytic cell body with 2 groups, each group has 50 unit cells, each unit cell is connected in series, and the electrolytic cell groups are connected in parallel, and other devices are the same as those in the first embodiment. The process steps are the same as in Example 1, 6000L of succinic acid mother liquor (5-10% sulfuric acid), and 600kg of maleic anhydride is added at the beginning of electrolysis, the electrolyte temperature is 50-60°C, and the current density is 300-900A / m 2 electrolysis under conditions. After the electrolysis, the electrolyte was decolorized, cooled and crystallized for 4-8 hours, filtered and dried to obtain 670 kg of colorless succinic acid crystals. The melting point is 185.6-187.2°C, the content of easy oxides is less than 0.06%, the cell voltage is 2.5-3.4V, the electrolytic unit consumption is 895.5kg maleic anhydride / ton succinic acid, and the current efficiency is 90.8%.

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Abstract

Apparatus and process for non-membrane electrolytic synthesis of succinic acid are both disclosed herewith. It takes stage-series flow process with exchangeable tanks to electrolyzing continuously and discharging periodically. The apparatus consists of an electrolytic bath, tanks, electrolyte distributing pipes, collecting pipes and high level tanks, pumps, and heat exchangers, which form cyclic circuits. An electrode set consisting of an anode and two cathodes are installed the bath. The cathodes are set on both sides of the anode respectively. This invention can produce quality succinic acid on large scale by synthesis with less investment on anode.

Description

(1) Technical field [0001] The invention relates to a device and a process for electrolytically synthesizing succinic acid without a diaphragm, in particular to an electrolysis process and a device for large-scale industrial production of succinic acid. (2) Background technology [0002] Succinic acid is an important synthetic medicine and fine chemical synthesis intermediate. In medicine, succinic acid is used to produce sedatives, sulfonamides, vitamin A, vitamin B6, hemostatic agents, diuretics, antipyretic and analgesic agents, and anti-inflammatory, Contraception and cancer treatment drugs, etc.; in pesticides, N-dimethylaminosuccinimide prepared from succinic acid series products is a low-efficiency plant growth inhibitor, and can also be used to synthesize pesticides Taibuta, Ale, Wikulil and N, N-diethylsuccinamide n-propyl ester, etc.; can also be used in synthetic dyes, alkyd resins, vinyl resins, adhesives and rubber plasticizers, glass fiber reinforced plastics a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B3/04C25B9/00C25B3/25
Inventor 甘永平张文魁黄辉
Owner ZHEJIANG UNIV OF TECH
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