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Device for preparing high-purity tetrapropylammonium hydroxide (TPAOH) through three-chamber two-membrane electrolytic method

A tetrapropylammonium hydroxide, high-purity technology, applied in electrolysis components, electrolysis process, electrolysis organic production, etc., can solve the problems of poor product quality, low TPAOH current efficiency, and unstable production of single-membrane electrolysis devices, and achieve Large production capacity, high space-time efficiency, and the effect of improving quality

Active Publication Date: 2017-07-18
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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  • Device for preparing high-purity tetrapropylammonium hydroxide (TPAOH) through three-chamber two-membrane electrolytic method
  • Device for preparing high-purity tetrapropylammonium hydroxide (TPAOH) through three-chamber two-membrane electrolytic method
  • Device for preparing high-purity tetrapropylammonium hydroxide (TPAOH) through three-chamber two-membrane electrolytic method

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 tetrapropylammonium hydroxide (TPAOH). The device is a plate-and-frame repolarization type electrolytic device improved from a plate-and-frame filter press. The device comprises a filter press, a filter press beam, a filter press thrust plate, a filter press pressing plate and a repolarization type electrolytic cell. The repolarization type electrolytic cell is composed of 1-50 electrolytic cell units in a tight pressing manner. Each electrolytic cell unit is a three-chamber two-membrane electrolytic cell body, that is, an anionic membrane, a cationic membrane, a cathode and an anode are used for forming an anode chamber, a raw material chamber and a cathode chamber. The device effectively separates non-electrolytic TPAOH, avoids sodions brought in by exchanging column regeneration and improves the product quality; expensive bipolar membranes are avoided, large current density can be adopted for electrolysis, current efficiency higher than that of an electrodialysis method is achieved, and the current efficiency is close to 100 %; and continuous electrolysis can be adopted, a market TPAOH solution with the concentration being about 7.5wt% can be directly obtained through the product, and the concentration working procedure is reduced.

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 Applications(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
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