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A device and method for electrolytic synthesis of succinic acid by diaphragm method with zero pole distance

A technology of electrolytic synthesis and succinic acid, which is applied in the direction of electrolytic process, electrolytic components, electrolytic organic production, etc., can solve the problem of high content of easily oxidized and fumaric acid, which affects the polymerization reaction and the performance of PBS, succinic acid Poor product quality and other problems, to achieve the effect of easy large-scale promotion and application, good economic benefits, and simple structure

Active Publication Date: 2018-05-11
SHANDONG FEIYANG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) Diaphragm or non-diaphragm electrolytic synthesis of succinic acid device, the electrode spacing is large and power consumption is high
[0005] (2) The quality of succinic acid prepared by electrolysis without diaphragm is poor, and the raw material succinic acid is easily oxidized at the anode to produce by-products such as oxalic acid and glyoxylic acid
[0006] (3) The conversion rate of maleic anhydride is low (about 0.95 tons of maleic anhydride is synthesized into 1 ton of succinic acid), and the content of easily oxidized and fumaric acid in the product is high. It is used as a monomer to synthesize PBS and affects the polymerization reaction and PBS performance

Method used

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  • A device and method for electrolytic synthesis of succinic acid by diaphragm method with zero pole distance
  • A device and method for electrolytic synthesis of succinic acid by diaphragm method with zero pole distance
  • A device and method for electrolytic synthesis of succinic acid by diaphragm method with zero pole distance

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Embodiment 1

[0040] The synthetic succinic acid device described in this embodiment is made up of 10 unit electrolyzers 1, when carrying out succinic acid electrolytic production, be the sulfuric acid of 5-10% in cathode and anolyte, be respectively total 1000L (anode liquid succinic acid saturation), add 100kg of maleic anhydride to the catholyte, control the temperature of the electrolyte at 50-60°C, and perform constant current electrolysis under the condition of a current density of 500A·m-2. At this time, the unit electrolysis Tank 1 tank voltage is 22-25V. The catholyte and the anolyte are distributed to each unit electrolyzer 1 through the catholyte inlet pipe 4 and the anolyte inlet pipe 2 respectively, and the electrolyte in each unit electrolyzer 1 passes through the catholyte outlet 16 and the anolyte respectively. Outlet 11 merges into catholyte outlet pipe 5 and anolyte outlet pipe 3 back to the catholyte and anolyte reservoirs. During the process of synthesizing succinic aci...

Embodiment 2

[0043]The difference from the succinic acid synthesis device described in Example 1 is that the succinic acid synthesis device described in this embodiment uses two sets of parallel connection, and each set uses 50 unit electrolyzers 1 connected in series. The process steps of synthesizing succinic acid are the same as in Example 1. The anolyte adopts 10000L of succinic acid mother liquor (5-10% sulfuric acid), and the catholyte is 5000L of 5-10% sulfuric acid. 1000kg of maleic anhydride was added, the temperature of the electrolyte was controlled at 50-60°C, and constant current electrolysis was carried out under the condition of a current density of 600A / m2. After the electrolysis, the electrolyte was decolorized, cooled and crystallized for 8 hours to room temperature, filtered and dried to obtain 1152.3 kg of colorless succinic acid crystals. The melting point of succinic acid crystals is 186.2-187.4°C, and the content of easy oxides is less than 0.06%. At this time, the c...

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Abstract

The invention discloses a device and method for electrolytically synthesizing succinic acid by a diaphragm method with zero pole distance, and relates to the technical field of electrolytically synthesizing succinic acid. It is installed close to the diaphragm and connected by a metal connecting piece. The stand-by monopolar electrolysis device realizes the zero pole distance between the cathode electrode and the anode electrode, reduces the power consumption of the electrolysis process, and reduces the DC power consumption per ton of succinic acid by 15‑ 20%; avoid the oxidation of raw materials and succinic acid products at the anode, improve the purity and quality of succinic acid products, reduce the consumption of raw materials, and the consumption of maleic anhydride per ton of succinic acid is less than 0.87 tons; the method is simple and easy , easy to popularize and apply on a large scale, the synthetic succinic acid product has low fumaric acid content and high conversion rate of maleic anhydride, which can meet the needs of food, medicine and PBS polyester industry, and achieve good economic benefits.

Description

technical field [0001] The invention relates to the technical field of electrolytic synthesis of succinic acid, in particular to a device and method for electrolytic synthesis of succinic acid by a diaphragm method with zero pole distance. Background technique [0002] Succinic acid is an important chemical raw material, which is widely used as an intermediate in the synthesis of food, medicine, pesticides and polymer resins. Succinic acid is used as a food sour agent for seasoning of wine, feed, candy, etc., sodium salt is a commonly used food flavoring agent, dimethyl and diethyl succinate can be used as flavor enhancers for food; it is used in the production of medicine Sedatives, sulfa drugs, vitamin A, vitamin B6, antipyretic and analgesic agents, anti-inflammatory, contraceptive and cancer treatment drugs; plasticizers for alkyd resins, vinyl resins, adhesives and rubber in the polymer field, glass fiber reinforcement Plastics and ion exchange resins, etc.; especially...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B3/04C25B9/00C25B3/25
Inventor 吴元峰郑鹏张文魁甘永平黄辉姜伟陶新永韦兴鹏郑伟夏阳张明梁初
Owner SHANDONG FEIYANG CHEM