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Device and method for preparing high-purity tetrapropylammonium hydroxide and co-producing bromine through electrolysis

A technology of tetrapropylammonium hydroxide and tetrapropylammonium bromide, which is applied in the field of preparation of bromine co-produced by tetrapropylammonium hydroxide, can solve the problem of difficult large-scale safe production, difficult recovery of by-product bromide, The yield of finished products is not high, so as to achieve the effect of easy automatic control, environmental protection and large output

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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to solve the problems of low finished product yield, low purity, inconvenient operation, large amount of waste water, difficulty in large-scale safe production, and difficult recovery of by-product bromide in the existing tetrapropylammonium hydroxide preparation method. A device and method for preparing high-purity tetrapropylammonium hydroxide and co-producing bromine by electrolysis with two chambers and one membrane

Method used

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  • Device and method for preparing high-purity tetrapropylammonium hydroxide and co-producing bromine through electrolysis
  • Device and method for preparing high-purity tetrapropylammonium hydroxide and co-producing bromine through electrolysis

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Effect test

Embodiment 1

[0026] Under the reaction condition of 60 °C, a tetrapropylammonium bromide solution with a mass concentration of 45% was added to the anode chamber 1, and the current density was 600 A / m 2 , after the electrolysis reaction, the tetrapropylammonium hydroxide with a mass concentration of 25% in the cathode chamber 2 was obtained. The mass concentration of each metal ion in tetrapropylammonium hydroxide is less than 20 ppb, and the mass concentration of bromide ion is less than 100 ppm (see Table 1); the current efficiency is 52%, and the product conversion rate is 98.2%.

Embodiment 2

[0028] Under the reaction condition of 70 °C, a solution of tetrapropylammonium bromide with a mass concentration of 55% was added to the anode chamber 1, and 700 A / m 2 The current density, after the electrolysis reaction, obtains the tetrapropyl ammonium hydroxide that mass concentration is 30% in the cathode chamber 2. The mass concentration of each metal ion in tetrapropylammonium hydroxide is less than 20 ppb, and the mass concentration of bromide ion is less than 100 ppm (see Table 1); the current efficiency is 61%, and the product conversion rate is 98.3%.

Embodiment 3

[0030] Under the reaction condition of 75 °C, a tetraethylammonium bicarbonate solution with a mass concentration of 55% was added to the anode chamber 1, and the current density was 800 A / m 2 , after the electrolysis reaction, the tetrapropylammonium hydroxide with a mass concentration of 20% in the cathode chamber 2 was obtained. The mass concentration of each metal ion in tetrapropylammonium hydroxide is less than 20 ppb, and the mass concentration of bromide ion is less than 100 ppm (see Table 1); the current efficiency is 65%, and the product conversion rate is 98.5%.

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Abstract

The invention discloses a device and a method for preparing high-purity tetrapropylammonium hydroxide and co-producing bromine through electrolysis. The method comprises the following steps: pumping and putting a tetrapropyl ammonium bromide solution of which the mass concentration is 45-55% in a raw material circulation tank into an anode chamber, meanwhile blowing air into the anode chamber through an air compressor, dehydrating the tetrapropyl ammonium bromide in the anode chamber to generate cation (CH3CH2CH2)4N<+> and anion Br<->, feeding the cation into a cathode chamber through a cation exchanger membrane, feeding the anion to an anode plate to generate gas phase bromine, feeding the gas phase bromine together with diluted tetrapropyl ammonium bromide into a gas-liquid separator for gas-liquid separation, feeding the diluted tetrapropyl ammonium bromide in the gas-liquid separator and separated liquid bromine into two bromine settling tank for switching and settling, mixing the diluted tetrapropyl ammonium bromide which contains a small amount of bromine at an upper layer with concentrated tetrapropyl ammonium bromide which is discharged from a concentrated tetrapropyl ammonium bromide tank into tetrapropyl ammonium bromide of which the mass concentration is 45-55%, and feeding the tetrapropyl ammonium bromide into the raw material circulation tank for further recycling and use, wherein the ionic concentration of the tetrapropylammonium hydroxide is less than 100ppm, and the content of metal ions is less than 20ppb.

Description

technical field [0001] The invention relates to a method for preparing bromine in parallel with tetrapropylammonium hydroxide, in particular to a method for electrolytically preparing high-purity tetrapropylammonium hydroxide in parallel with bromine by using a two-chamber one-membrane ion membrane electrolysis device. Background technique [0002] Tetrapropylammonium hydroxide (TPAOH) is an organic base, which can be used as a phase transfer catalyst, alkali source and template agent for the synthesis of molecular sieves TS-1 and ZSM-5, and molecular sieves TS-1 and ZSM-5 are widely used in Petroleum industry impurity removal agent, catalyst and other fields. The existing preparation method of tetrapropyl ammonium hydroxide has following several kinds: [0003] The first method is a chemical method, using tetrapropylammonium bromide as a raw material to react with silver oxide in a solvent or using tetrapropylammonium bromide as a raw material to react with potassium hydro...

Claims

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Application Information

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IPC IPC(8): C25B9/10C25B3/00C25B1/24C25B9/23
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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