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A continuous production method for electrochemically synthesizing sebacate compounds

A technology of sebacate and production method, which is applied in the field of continuous production of electrochemical synthesis of sebacate compounds, can solve problems such as excessive anode failure, and achieve the advantages of prolonging service period, reducing operating cost and reducing corrosion risk. Effect

Active Publication Date: 2021-04-20
WANHUA CHEM (SICHUAN) CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The invention provides a continuous production method for electrochemically synthesizing sebacic acid ester compounds, which can solve the technical problem of too fast anode failure during the electrolytic reaction process of adipate esters

Method used

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  • A continuous production method for electrochemically synthesizing sebacate compounds
  • A continuous production method for electrochemically synthesizing sebacate compounds
  • A continuous production method for electrochemically synthesizing sebacate compounds

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] [Example 1] Synthesis of dimethyl sebacate

[0047] No. 1 electrolytic cell is equipped with mesh Ti-based IrO 2 Anode and stainless steel cathode, anode area is 0.01m 2 ; The cathode and anode are alternately arranged horizontally. Set the electrolysis potential to 1.2V and the electrolysis current density to 500A / m 2 .

[0048] No. 2 electrolytic cell is equipped with mesh platinum-titanium anode and graphite cathode, and the anode area is 0.1m 2 ; The cathode and anode are arranged alternately vertically, and the extension direction of the net surface of the cathode and anode is consistent with the flow direction of the material. Set the electrolysis potential to 3V and the electrolysis current density to 2000A / m 2 .

[0049] Dissolve 1600g monomethyl adipate and 105g potassium methoxide in 1600g and 1600g methanol respectively to form feed solution A and feed solution B; simultaneously feed feed solution A and feed solution B into the raw material mixer for mi...

Embodiment 2

[0055] [Example 2] Synthesis of diethyl sebacate

[0056] No. 1 electrolyzer selects meshed Ti-based PbO 2 For the anode and the stainless steel cathode, the No. 2 electrolytic cell selects the plate-shaped platinum anode and the platinum-titanium cathode, which are arranged in the arrangement in Example 1. Adjust the electrolytic potential of No. 1 electrolytic cell to 1.6V and the electrolytic current density to 700A / m 2 , the electrolytic potential of No. 2 electrolytic cell is 2.8V, and the electrolytic current density is 1800A / m 2 .

[0057] Dissolve 1740g monoethyl adipate and 80g sodium hydroxide in 1740g and 1710g of solvent benzene respectively to form feed liquid A and feed liquid B; feed liquid A and feed liquid B into the raw material mixer simultaneously for 10 minutes, control Feeding speed, so that material liquid A, B complete feeding at the same time.

[0058] The mixed material is 2m 3 The feed rate of / h is pumped into the No. 1 electrolytic cell, and t...

Embodiment 3

[0063] [Example 3] Synthesis of dipropyl sebacate

[0064] No. 1 electrolyzer selects meshed Ti-based RuO 2 For the anode and stainless steel cathode, plate-shaped platinum anode and platinum-titanium cathode are selected for the No. 2 electrolytic cell, and are arranged in the arrangement in Example 1. Adjust the electrolytic potential of No. 1 electrolytic cell to 1.8V, and the electrolytic current density to 1000A / m 2 , the electrolytic potential of No. 2 electrolytic cell is 2.5V, and the electrolytic current density is 1600A / m 2 .

[0065] Dissolve 2300g dipropyl adipate and 303g triethylamine in 2300g and 2300g propanol respectively to form feed solution A and feed solution B; feed feed solution A and feed solution B into the raw material mixer simultaneously for 10min and control Feeding speed, so that material liquid A, B complete feeding at the same time.

[0066] The mixed material is 2m 3 The feed rate of / h is pumped into the No. 1 electrolytic cell, so that t...

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Abstract

The invention provides a continuous production method for electrochemically synthesizing sebacate compounds, comprising the following steps: A. Sending adipate raw materials and electrolytes to No. 1 electrolytic cell, and making adipic acid The first step is to generate a polymer and adsorb it on the surface of the anode to remove easily adsorbed impurities; B. Send the mixed solution that removes easily adsorbed impurities to the No. 2 electrolytic cell, and trigger an electrochemical reaction through high potential control to prepare sebacate compounds . In the present invention, low-potential control is first performed in the No. 1 electrolytic cell, so that the impurity adipic acid is firstly generated into a polymer and adsorbed on the surface of the anode to remove easily adsorbed impurities, and then switched to the No. 2 electrolytic cell for electrochemical reaction, which can Effectively avoid polymer accumulation on the anode surface of the No. 2 electrolytic cell, reduce the risk of corrosion under anode scale, prolong the service period of the equipment, reduce the operating cost of the device, and ensure the long-term stable operation of the electrolysis system and industrialized continuous production.

Description

technical field [0001] The invention relates to a continuous production method, in particular to a continuous production method for electrochemically synthesizing sebacate compounds. Background technique [0002] Sebacic acid is an important raw material for the synthesis of polymer materials and organic synthesis. Published patent CN101318892A describes a method for preparing sebacic acid from castor oil compounds, and sebacic acid is prepared from castor oil by alkaline cracking of ricinoleic acid under high pressure and high temperature; but the method has high energy consumption, and The price of raw material castor oil fluctuates greatly. In order to prepare sebacic acid cheaply, researchers are actively looking for new raw materials and synthetic methods. Among them, esterification of adipic acid as raw material to synthesize adipate compounds, and then through Brown-Walker electrolytic decarboxylation coupling to synthesize sebacic acid ester compounds, and then hyd...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B3/07C25B3/29
Inventor 栾谨鑫杜旺明刘释水钱向阳李俊平
Owner WANHUA CHEM (SICHUAN) CO LTD
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