Method for preparing tetrapropyl ammonium hydroxide by utilizing bipolar membrane electrodialysis

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...

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 exchange resin, and adopt sodium hydroxide solution to regenerate the anion exchange resin, but the quality and purity of the product are not high; and because the strong alkalinity of TPAOH is corrosive to ion exchange resin, the resin quality decline

In addition, the regeneration operation of the resin is difficult, and this method has not been widely used

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