Method for reducing anions in quaternary ammonium base by virtue of continuous electrolysis

A technology of quaternary ammonium base and anion, which is applied in the direction of electrolysis process, electrolysis components, electrolysis organic production, etc., can solve the problems that the purification process cannot be continuously produced in small batches, and the concentration of anions is high, so as to improve product conversion rate, reduce safety accidents, Effects of Safety and Reliability Improvement

Active Publication Date: 2014-10-01
镇江润晶高纯化工科技股份有限公司
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Problems solved by technology

[0008] The purpose of the present invention is to provide a method for reducing the concentration of anions in the crude product of quaternary ammonium alkali through efficient continuous electrolysis, effectively overcome the shortcoming of high anion concentration in the product obtained by the existing quaternary ammonium alkali preparation process, and overcome the inability of the purification process of intermittent electrolysis quaternary ammonium alkali Disadvantages of continuous and small batch production, realizing continuous mass production of high-purity quaternary ammonium alkali

Method used

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  • Method for reducing anions in quaternary ammonium base by virtue of continuous electrolysis

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Experimental program
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Effect test

Embodiment 1

[0039] Add 25% tetrabutylammonium hydroxide crude product into anode chamber 1, add 5% tetrabutylammonium hydroxide aqueous solution into intermediate chamber 2, add 20% tetrabutylammonium hydroxide aqueous solution into cathode chamber 3, open circulation pump 11 etc., connect direct current 7, Start electrolysis. Control the concentration of tetrabutylammonium hydroxide in the electrolytic cell of anode chamber 1 at 15%~25%, control the temperature of each chamber at 65 °C, and control the current density at 300 A / m 2 , Continuous electrolysis reaction for 7 days to obtain a tetrabutylammonium hydroxide aqueous solution with a finished product content of 20.6%. Its bromide ion concentration is 0.81 ppm; the current efficiency is 26%.

Embodiment 2

[0041] Add 25% tetrabutylammonium hydroxide crude product into the anode chamber 1, add 10% tetrabutylammonium hydroxide aqueous solution into the middle chamber 2, add 20% tetrabutylammonium hydroxide aqueous solution into the cathode chamber 3, open the circulation pump 11 etc., connect the direct current 7, Start electrolysis. Control the concentration in the electrolytic cell of anode chamber 1 at 15-25%, control the temperature of each chamber at 75 °C, and control the current density at 300 A / m 2 , continuous electrolytic reaction for 7 days, to obtain tetrabutylammonium hydroxide with a finished product content of 20.1%. The bromide ion concentration is 0.68 ppm; the current efficiency is 45%.

Embodiment 3

[0043] Add 25% tetrabutylammonium hydroxide crude product into the anode chamber 1, add 8% tetrabutylammonium hydroxide aqueous solution into the middle chamber 2, add 20% tetrabutylammonium hydroxide aqueous solution into the cathode chamber 3, open the circulation pump 11, etc., connect the direct current 7, Start electrolysis. Control the concentration in the electrolytic cell of the anode chamber 1 at 15-25%, control the temperature of each chamber at 70 °C, and control the current density at 1000 A / m 2 , continuous electrolytic reaction for 7 days, to obtain tetrabutylammonium hydroxide with a finished product content of 20.2%. The bromide ion concentration is 0.72 ppm; the current efficiency is 43%.

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Abstract

The invention relates to a method for reducing anions in quaternary ammonium base by virtue of continuous electrolysis,particularly relates to a technology for continuously preparing high-purity quaternary ammonium base by adopting the method for efficiently reducing the concentration of anions in the crude quaternary ammonium base by virtue of continuous electrolysis, and belongs to the field of organic chemistry. The method comprises the following step: continuously electrolyzing at the control temperature of 60-80DEG C by taking 25wt% crude water solution containing 1000ppm quaternary ammonium base as a raw material by virtue of an electrolysis device with a three-chamber two-membrane cation membrane, so as to prepare high-purity quaternary ammonium base with anions of less than 1ppm. According to the method, the membrane cost can be saved, the current efficiency and the product conversion rate can be improved, the energy consumption can be reduced, the quality of products can be further improved, and the method is suitable for large-scale safety and clean industrial production, and has no emission of waste water and solid waste.

Description

technical field [0001] The invention relates to a method for continuous electrolysis to reduce anions in quaternary ammonium bases, in particular to a process for continuously preparing high-purity quaternary ammonium bases through continuous electrolysis to efficiently reduce the anion concentration in crude quaternary ammonium bases, and belongs to the field of organic chemistry. Background technique [0002] Quaternary ammonium bases such as tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide, tetrabutylammonium hydroxide, benzyltrimethylammonium hydroxide, benzyltriethylammonium hydroxide, commonly used as Organic synthesis reagents, surfactants, phase transfer catalysts, cleaning reagents in the electronics industry, polarographic analysis reagents. High-purity quaternary ammonium alkali is mainly used for chip cleaning and corrosion. Its purity and cleanliness have a very important impact on the yield, electrical performance and r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B3/00
Inventor 赵文洲
Owner 镇江润晶高纯化工科技股份有限公司
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