A kind of method for preparing high-purity tetraethylammonium hydroxide by continuous electrolysis

A tetraethylammonium hydroxide, high-purity technology, applied in the electrolysis process, electrolysis components, electrolysis organic production and other directions, can solve the problems of difficult large-scale safe production, low product yield, low product purity, etc. Current efficiency and product conversion, reduced energy consumption, improved safety and reliability

Active Publication Date: 2016-03-09
镇江润晶高纯化工科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a method for preparing high-purity tetraethylammonium hydroxide by continuous electrolysis, which overcomes the disadvantages of long reaction time, low product yield, low product purity, inconvenient operation and difficulty in large-scale safe production in the prior art

Method used

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  • A kind of method for preparing high-purity tetraethylammonium hydroxide by continuous electrolysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Aqueous tetraethylammonium bicarbonate solution with a concentration of 40% is put into the anode chamber 1 from the feed inlet 8 of the raw material. An aqueous tetraethylammonium hydroxide solution with a concentration of 2% was added to the cathode chamber 2 from the supplementary water inlet. Turn on the circulating pumps 11, 13, 15, 17. Connect the alternating current 7, connect the current between the anode plate 3 in the anode chamber 1 and the cathode plate 4 in the cathode chamber 2, so that the current density is 1000A / m 2 , the reaction temperature is 25°C. In the anode compartment 1, tetraethylammonium carbonate is hydrolyzed to generate cations (CH 3 CH 2 ) 4 N ＋ and anion CO 3 2- , water will be hydrolyzed to generate H ＋ and OH － . Cation (CH 3 CH 2 ) 4 N ＋ 、H ＋ with the metal cation R in solution n＋ Through the cation exchange membrane 5 into the cathode chamber 2. while the anion CO 3 2- with OH － Arriving at the anode plate 3, the e...

Embodiment 2

[0029] Change the concentration of tetraethylammonium bicarbonate to tetraethylammonium chloride with a concentration of 30%, change the concentration of tetraethylammonium hydroxide initially added to the cathode chamber 2 to 3%, and change the current density to 1500A / m 2 , the reaction temperature was changed to 35°C, and the rest of the steps were the same as in Example 1. After the electrolytic reaction, when the concentration of tetraethylammonium hydroxide in the cathode chamber 2 was greater than 25%, the product was output from the outlet 9 at the bottom of the cathode chamber 2. The concentration of each metal ion in the product is less than 20ppb, and the carbonate radical is less than 100ppm, as shown in Table 1; the product conversion rate of this method is 98.3%.

Embodiment 3

[0031] Change the concentration of tetraethylammonium bicarbonate to tetraethylammonium bromide with a concentration of 50%, change the concentration of tetraethylammonium hydroxide initially added to the cathode chamber 2 to 4%, and change the current density to 1700A / m 2 , the reaction temperature was changed to 45°C, and the rest of the steps were the same as in Example 1. After the electrolytic reaction, when the concentration of tetraethylammonium hydroxide in the cathode chamber 2 was greater than 25%, the product was output from the outlet 9 at the bottom of the cathode chamber 2. The concentration of each metal ion in the product is less than 20ppb, and the carbonate radical is less than 100ppm, as shown in Table 1; the product conversion rate of this method is 98.2%.

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Abstract

The invention discloses a method for preparing high-purity tetraethylammonium hydroxide by continuous electrolysis. A two-chamber one-membrane ion-exchange membrane electrolysis device is used to put an aqueous solution of tetraethylammonium salt with a raw material concentration of 30% to 50% in an anode chamber. , add the tetraethylammonium hydroxide aqueous solution with a concentration of 2-5% into the cathode chamber, and connect the current between the anode plate and the cathode plate; in the anode chamber, the tetraethylammonium salt is hydrolyzed to generate cations (CH3CH2) 4N+ and its anion X-, cation (CH3CH2) 4N+, H+ and the metal cation Rn+ in the solution enter the cathode chamber through the cation exchange membrane, and the anion X- and OH- reach the anode plate to generate gas. In the cathode chamber, the cation (CH3CH2 ) 4N+ and OH- generated by hydrolysis of water produce tetraethylammonium hydroxide, H+ reaches the cathode plate to obtain electrons to generate H2, and tetraethylammonium hydroxide with a concentration of 5% to 30% is obtained in the cathode chamber; the present invention continuously develops The concentration of each material in the anode chamber and the cathode chamber is relatively constant, which improves the current efficiency and product conversion rate, and reduces energy consumption.

Description

technical field [0001] The present invention relates to a method for preparing tetraethylammonium hydroxide, in particular to the method of preparing high-purity tetraethylammonium hydroxide by using tetraethylammonium salt as raw material, adopting two-chamber one-membrane ion membrane electrolysis device, continuous electrolysis method. Background technique [0002] Tetraethylammonium hydroxide (TEAH) is an organic base that can be used as a phase transfer catalyst, template agent for molecular sieve synthesis, cleaning agent, and impurity removal agent in the petroleum industry. The existing preparation method of tetraethylammonium hydroxide is: earlier acetone and triethylamine are added in a closed container, replace air with inert gas, then introduce ethyl chloride, heat and keep stirring for more than 150 hours, then cool, Separate tetraethylammonium chloride; then wash with water, conduct ion exchange with high-efficiency basic resin to obtain crude tetraethylammoni...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B3/00C07C211/63
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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