Method for preparing tetrapropyl ammonium hydroxide by utilizing bipolar membrane electrodialysis

A technology of tetrapropylammonium hydroxide and bipolar membrane electrodialysis, which is applied in chemical instruments and methods, preparation of amino compounds, preparation of organic compounds, etc., can solve the problems of resin quality decline, high price, difficult separation, etc., and achieve Reduce energy consumption, achieve the effect of raw material cost, low cost and multiple selectivity

Inactive Publication Date: 2012-07-04
ZHEJIANG UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the generation of chlorine gas, this method will dissolve in the solution and undergo a series of complicated reactions, so that the TPAOH aqueous solution contains a large amount of impurities, and the raw materials and products are mixed together, which is difficult to separate and expensive.
The ion exchange method is to produce TPAOH by anion...

Method used

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  • Method for preparing tetrapropyl ammonium hydroxide by utilizing bipolar membrane electrodialysis
  • Method for preparing tetrapropyl ammonium hydroxide by utilizing bipolar membrane electrodialysis
  • Method for preparing tetrapropyl ammonium hydroxide by utilizing bipolar membrane electrodialysis

Examples

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Embodiment 1

[0032] The preparation of tetrapropyl ammonium hydroxide adopts bipolar membrane electrodialysis equipment to carry out, and described bipolar membrane electrodialysis equipment is made up of 2 bipolar membrane electrodialysis devices connected in series, and described bipolar membrane electrodialysis device is made up of two sides The polar liquid chamber is composed of an electrodialysis compartment sandwiched between the polar liquid chambers on both sides.

[0033] A bipolar membrane electrodialysis device with a two-compartment structure, the area of ​​each membrane is 200mm×400mm, a total of 20 pairs (that is, 20 groups of units composed of bipolar membranes and cation exchange membranes) bipolar membranes, cation exchange membranes Form a membrane stack, the bipolar membrane electrodialysis device is composed of anolyte chambers on both sides, the anolyte chamber is divided into an anode chamber and a cathode chamber, the left side is a cathode chamber, and the right sid...

Embodiment 2

[0036] The preparation of tetrapropyl ammonium hydroxide adopts bipolar membrane electrodialysis equipment to carry out, and described bipolar membrane electrodialysis equipment is made up of 2 bipolar membrane electrodialysis devices connected in series, and described bipolar membrane electrodialysis device is made up of two sides The polar liquid chamber is composed of an electrodialysis compartment sandwiched between the polar liquid chambers on both sides.

[0037] A bipolar membrane electrodialysis device with a three-compartment structure is adopted. The area of ​​each membrane is 200 mm × 800 mm. A total of 40 pairs of bipolar membranes, anion and cation exchange membranes form a membrane stack. The bipolar membrane electrodialysis device consists of two The polar liquid chamber on the side is composed of the electrodialysis compartment sandwiched between the polar liquid chambers on both sides. The polar liquid chamber is divided into a cathode chamber and an anode cham...

Embodiment 3

[0040] The preparation of tetrapropyl ammonium hydroxide adopts bipolar membrane electrodialysis equipment to carry out, and described bipolar membrane electrodialysis equipment is made up of 2 bipolar membrane electrodialysis devices connected in series, and described bipolar membrane electrodialysis device is made up of two sides The polar liquid chamber is composed of an electrodialysis compartment sandwiched between the polar liquid chambers on both sides.

[0041] A bipolar membrane electrodialysis device with a four-compartment structure is adopted. The area of ​​each membrane is 200mm×800mm. A total of 40 pairs of bipolar membranes, anion exchange membranes and 80 cation exchange membranes form a membrane stack. The bipolar membrane electrodialysis The dialysis device is composed of anolyte chambers on both sides and an electrodialysis compartment sandwiched between the anolyte chambers on both sides. The anolyte chamber is divided into a cathode chamber and an anode cha...

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Abstract

The invention discloses a method for preparing tetrapropyl ammonium hydroxide by utilizing bipolar membrane electrodialysis, and the method comprises the following steps of: using a tetrapropyl ammonium bromide aqueous solution as a raw material, processing the tetrapropyl quaternary ammonium salt aqueous solution through a microporous filter, and then enabling the processed tetrapropyl quaternary ammonium salt aqueous solution to enter a material liquid room of a bipolar membrane electrodialyzing device, respectively adding water in an acid room and an alkali room, respectively adding a sodium sulfate solution in pole liquid rooms, controlling the current density, the voltage and the temperature of the bipolar membrane electrodialyzing device to be 150-600 A/M2, 20-300 V and 5-45DEG C respectively, carrying out circulating cooling through chilled saline water in a circulating coil pipe by using an electrodialyzing compartment in a running process, stopping running when the conductivity of the material liquid room is decreased to below 2000 [mu]s/cm, obtaining a tetrapropylammonium hydroxide solution in the alkali room, and recycling a hydrobromic acid solution in the acid room. By using the method, the raw material cost is low; the selectivity is multiple; the purity of the tetrapropyl ammonium hydroxide is high; hydrobromic acid further can be recovered; and the generation of a pollutant in the process is effectively avoided.

Description

(1) Technical field [0001] The invention relates to a method for preparing tetrapropylammonium hydroxide, in particular to a method for preparing tetrapropylammonium hydroxide by using bipolar membrane electrodialysis. (2) Background technology [0002] Tetrapropylammonium hydroxide (TPAOH) has a wide range of uses in the industrial field, such as the preparation of titanium silicon-1 catalyst in the petrochemical process, the catalyst in the synthesis of organic silicon series products, polyester polymerization, textile, plastic Products and leather and other fields. At present, TPAOH is widely used in the field of electronics, mainly as a photolithography developer for printed circuit boards and a cleaning agent in the manufacture of microelectronic chips. With the development of society and the advancement of technology, higher requirements are put forward for the purity of TMAOH. The production methods of tetrapropylammonium hydroxide mainly include silver oxide method...

Claims

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Application Information

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IPC IPC(8): C07C211/63C07C209/00B01D61/44
Inventor 沈江南余杰阮慧敏王利祥叶云飞
Owner ZHEJIANG UNIV OF TECH
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