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A device for preparing high-purity tetrapropylammonium hydroxide by three-chamber two-membrane electrolysis

A tetrapropyl ammonium hydroxide, high-purity technology, used in electrolysis components, electrolysis process, electrolysis organic production, etc., can solve the problems of low TPAOH current efficiency, unstable production, poor product quality of single-membrane electrolysis devices, etc. The effect of large production capacity, improved quality and high time and space efficiency

Active Publication Date: 2019-05-07
JIANGSU SANJILI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the shortcomings of the current electrolytic electrodialysis method for preparing TPAOH, such as low current efficiency, poor product quality of single-membrane electrolysis devices, unstable production, bromine precipitation at the anode and reaction of raw materials passing through the diaphragm to produce solid products, etc.

Method used

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  • A device for preparing high-purity tetrapropylammonium hydroxide by three-chamber two-membrane electrolysis
  • A device for preparing high-purity tetrapropylammonium hydroxide by three-chamber two-membrane electrolysis
  • A device for preparing high-purity tetrapropylammonium hydroxide by three-chamber two-membrane electrolysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A device for preparing high-purity TPAOH by three-chamber two-membrane electrolysis: the device is a plate-and-frame bipolar electrolysis device modified from a plate-and-frame filter press, including filter press A, filter press beam B, and filter press thrust plate C , Filter press pressing plate D and bipolar electrolyzer. The bipolar electrolyzer consists of 20 three-chamber two-membrane unit electrolyzers 1 connected in series. Each three-chamber two-membrane unit electrolytic cell 1 includes an anode chamber, a raw material chamber, and a cathode chamber. The anode chamber is composed of the anode surface of the bipolar electrode 2, the anode sealing frame 6, the anode frame 4, the anion diaphragm 7 and the diaphragm frame; the cathode chamber It is composed of cation diaphragm 8 and diaphragm frame, cathode frame 5, cathode sealing frame 6, and the cathode surface of bipolar electrode 2; the lower part of one side of the anode frame 4, raw material frame 3 and ca...

Embodiment 2-10

[0036] Example 2-10 Prepare high-purity TPAOH by electrolysis according to the electrolysis device of Example 1, and the bipolar electrode 2 is RuO 2 -TiO 2 / Ti, RuO 2 -TiO 2 / Ti|Fe, carbon steel / carbon steel, IrO 2 -Ta 2 o 5 One of / Ti or titanium / titanium, and use different types of electrolytic cell materials and diaphragm materials, cationic diaphragms 1, 2, and 3 are perfluorinated composite membranes, perfluorosulfonic acid membranes and perfluorocarboxylic acid membranes, anion membranes Diaphragms 1 and 2 are respectively a quaternary ammonium salt composite anion membrane and a quaternary ammonium salt type anion membrane. A 7.5wt% high-purity TPAOH solution was prepared by continuous electrolysis, the process parameters were the same as in Example 1, and the results are shown in Table 1.

[0037] Table 1 Experimental results of electrolytic synthesis of TPAOH solution with different electrode materials and diaphragm materials

[0038]

Embodiment 11

[0040] According to the method and electrolysis device of embodiment 1, the number of unit electrolyzers is 40, and the circuit connection adopts every 20 in series, and then connects in two parallel ways. Add 5wt% ammonia water to the anolyte storage tank, add 25wt% TPABr solution to the raw material storage tank, and add 1wt% TPAOH solution to the cathode storage tank. The electrolysis current is 200A, the temperature is controlled from room temperature to 30°C, and the concentration of TPAOH in the electrolyte in the cathode area is 7.5%. After the electrolysis, the concentration of the TPABr solution in the raw material storage tank is reduced to 7.5-15 wt%. Control the electrolyte in the anode area to be pH<8 alkaline (if it is found to be weakly acidic, add ammonia water). After the electrolysis is finished, the TPAOH product in the cathode area is released, and the TPABr solid is added until the concentration of the solution in the raw material tank is 25wt%. The volta...

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Abstract

The invention discloses a device for preparing high-purity tetrapropyl ammonium hydroxide. The device is a plate and frame bipolar electrolysis device refitted from a plate and frame filter press, including a filter press, a filter press beam, and a filter press thrust plate, filter press pressing plate and bipolar electrolyzer, the bipolar electrolyzer is composed of 1‑50 unit electrolyzers tightly pressed; the unit electrolyzer is a three-chamber two-membrane electrolyzer, that is, an anion membrane, a cation membrane and a cathode are used and the anode respectively constitute the anode chamber, the raw material chamber and the cathode chamber. The device effectively separates the non-electrolyzed tetrapropylammonium bromide, and avoids the sodium ions brought in by the regeneration of the exchange column, which improves the quality of the product; avoids the use of expensive bipolar membranes, and can use high current density electrolysis, It has a higher current efficiency than the electrodialysis method, and the current efficiency is close to 100%; continuous electrolysis can be used, and the product can directly obtain a commercially available tetrapropylammonium hydroxide solution with a concentration of about 7.5wt%, which reduces the concentration process.

Description

technical field [0001] The invention relates to a device for preparing high-purity tetrapropylammonium hydroxide (TPAOH) by electrolysis. Background technique [0002] Tetrapropylammonium hydroxide (TPAOH), the molecular formula is C 12 h 28 NOH, like most quaternary ammonium bases, is easy to absorb moisture and dissolve in water. When exposed to the air, it can absorb carbon dioxide in the air, and it is easy to decompose when heated. TPAOH is widely used in catalytic cracking and catalytic reforming in petroleum industry. TPAOH is an irreplaceable alkali source and template for titanium-silicon molecular sieves, which are catalysts for petroleum cracking in the petrochemical industry, and plays an important role in the structure-oriented synthesis of ZSM-5 molecular sieves. [0003] At present, TPAOH is mainly prepared from the corresponding quaternary ammonium salt in industry. There are three commonly used methods, including ion exchange resin method, silver oxide me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B3/00C25B9/06C25B9/08C25B9/17C25B9/19
CPCC25B3/00C25B9/19
Inventor 汪保卫甘永平张文魁黄辉刘德标徐传春杨世刚王恒启
Owner JIANGSU SANJILI CHEM