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Preparation method of onium hydroxide

An oxide, onium hydrogen technology, applied in chemical instruments and methods, preparation of amino compounds from amines, organic chemistry, etc., can solve the problems of complex electrolysis equipment, by-product generation, etc., to reduce production costs, shorten the time of downtime, The effect of continuous operation for a long time

Active Publication Date: 2015-01-21
GUANGZHOU DAYOU FINE CHEM PLANT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although unipolar membrane electrodialysis can obtain high-quality products, the electrolysis equipment used is relatively complicated and by-products are generated

Method used

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  • Preparation method of onium hydroxide
  • Preparation method of onium hydroxide

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preparation example Construction

[0019] The invention provides a preparation method of onium hydroxide shown in formula I, the method comprising: sending the aqueous solution of onium salt shown in formula II into a bipolar membrane electrodialysis device, and performing bipolar membrane electrodialysis, Obtain the aqueous solution that contains the onium hydroxide shown in formula I, wherein, the method comprises sending neutralizing liquid into the acid chamber of bipolar membrane electrodialysis device, and described neutralizing liquid contains the acid-base reaction that can take place with HX substance,

[0020]

[0021] According to the method of the present invention, the onium salt represented by formula II can be properly selected according to the structure of the expected onium hydroxide, and can be various onium salts commonly used in the art. Generally, in formula I and formula II, M can be N, S or P; R 1 , R 2 , R 3 and R 4 same or different, each can be C 1 -C 20 Straight chain or bran...

Embodiment 1

[0058] The membrane stack of the bipolar membrane electrodialysis device used in this embodiment is as figure 1 As shown, wherein, the number of bipolar membranes is 51, and the number of anion exchange membranes is 50.

[0059] Dissolve tetrapropylammonium bromide in water to prepare an aqueous solution with a concentration of 25% by weight, and place it in a feed liquid storage tank. NaOH was dissolved in water to prepare an aqueous solution with a concentration of 0.18% by weight as the polar liquid, and placed in the polar liquid storage tank. Ammonia water with a concentration of 2.5% by weight was used as a neutralizing solution, and the neutralizing solution was placed in a neutralizing solution storage tank.

[0060] Send the prepared tetrapropylammonium bromide aqueous solution into the alkali chamber of the bipolar membrane electrodialysis device, send the polar liquid into the anode chamber and cathode chamber of the bipolar membrane electrodialysis device, and sen...

Embodiment 2

[0069] Adopt the same method as Example 1 to prepare tetrapropyl ammonium hydroxide, the difference is that the neutralizing solution is a sodium hydroxide aqueous solution with a concentration of 0.8% by weight, and during continuous operation, the pH value of the neutralizing solution is controlled at 7 -8 range.

[0070] Production was carried out in the above-mentioned manner, and no abnormality was found in the continuous operation of the electrodialysis equipment for 2000 hours.

[0071] During the production process, the purity of each batch of aqueous solution containing tetrapropylammonium hydroxide was detected, and it was found that the purity of the aqueous solution obtained by each batch was stable, wherein the concentration of tetrapropylammonium hydroxide was 17.12% by weight , Na + The content is 350wppm, Br - The content is 0.38% by weight.

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Abstract

The invention provides a preparation method of an onium hydroxide represented by formula I. The method comprises the following steps: sending an aqueous solution of onium salt represented by formula II into a bipolar membrane electrodialysis apparatus, and carrying out bipolar membrane electrodialysis to obtain an aqueous solution of the onium hydroxide represented by formula I, wherein a neutralizing liquid is sent into the acid chamber of the bipolar membrane electrodialysis apparatus, and contains a substance, and the substance and HX undergo an acid-base reaction. The preparation method of the onium hydroxide has the advantages of long continuous running time of the bipolar membrane electrodialysis apparatus, production cost reduction and production efficiency increase. The onium hydroxide prepared through the method has purity and good quality.

Description

technical field [0001] The invention relates to a method for preparing onium hydroxide, in particular, the invention relates to a method for preparing onium hydroxide by using a bipolar membrane electrodialysis method. Background technique [0002] Quaternary ammonium base is an important organic base with a wide range of uses. It can be used as a cleaning agent, etching agent and polishing agent for integrated circuit boards in the electronics industry, and can also be used as an aid and catalyst in oil refining and chemical engineering. Moreover, quaternary ammonium bases (such as tetrapropylammonium hydroxide and tetraethylammonium hydroxide) are irreplaceable alkali sources and templates in the synthesis of titanium-silicon molecular sieves, while titanium-silicon molecular sieves have good catalytic performance for directional oxidation. It is an indispensable catalyst in the production of hydroquinone, cyclohexanone oxime and propylene oxide. [0003] At present, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C211/63C07C209/68B01D61/44
Inventor 王漫
Owner GUANGZHOU DAYOU FINE CHEM PLANT
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