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Four-chamber three-membrane electrolysis of short-chain quaternary ammonium base to prepare and co-produce hydrohalic acid method
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A technology of quaternary ammonium base and membrane electrolysis, applied in electrolytic organic production, electrolytic components, electrolytic process, etc., can solve the problems of low current density, high concentration energy consumption, low production efficiency, etc., achieve continuous mass production and eliminate deterioration Function, the effect of improving the service life
Active Publication Date: 2020-02-18
KENTE CATALYSTS INC
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The disadvantage is: the cost of using precious metal raw materials is too high, and there will be a small amount of silver ion residue
Defects are: there are flammable and explosive organic solvents in the product, the product yield is about 85% low, the product quality is poor, and the content of halide ions and alkali metal ions in the product reaches about 2000PPM, which is used as a template to prepare molecular sieves, which will reduce the molecular sieve. Catalytic activity
The disadvantage is that the current density is low, resulting in low production efficiency, low concentration of feed liquid, and high energy consumption in later concentration
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Embodiment 1
[0017] Such as figure 1 As shown, the four-chamber three-membrane electrolytic cell, the anode plate is a titanium substrate coated with an oxygen evolution coating, the cathode plate is nickel, the cationic membrane is a DuPont cationic membrane, the anionic membrane is an Asahi Nitrate anionic membrane, and 50% tetramethylammonium chloride aqueous solution is placed In the raw material circulation tank, use a pump to circulate in the raw material chamber and the raw material circulation tank, add pure water to the cathode circulation tank, use a pump to circulate in the cathode chamber and the cathode circulation tank, add pure water to the hydrochloric acid circulation tank, and use a pump in the middle Circulate in the chamber and the hydrochloric acid circulation tank, add 0.1% sulfuric acid aqueous solution in the anode circulation tank as a conductive agent, use a pump to circulate in the anode chamber and the anode circulation tank, connect the current between the two p...
Embodiment 2
[0020] Raw material uses 50% tetraethylammonium chloride aqueous solution, and other is the same with embodiment 1. Prepared tetraethylammonium hydroxide, main content 25%, colorless transparent liquid, color number less than 20 black Zeng, potassium, sodium, calcium, magnesium, iron ions less than 10ppm, halogen ions less than 10ppm, organic solvent residue Less than 100PPM. After the hydrochloric acid is concentrated in the intermediate chamber, the co-produced hydrochloric acid meets the index requirements of GB / T 622-2006 chemical reagent hydrochloric acid. The device has been running stably and continuously for 100 days, and the anion and cation membranes have no obvious deterioration such as perforation.
Embodiment 3
[0022] Raw material uses 50% tetrapropyl ammonium bromide aqueous solution, other is the same with embodiment 1. Prepared tetrapropylammonium hydroxide, main content 25%, colorless transparent liquid, color number less than 20 black Zeng, potassium, sodium, calcium, magnesium, iron ions less than 10ppm, halogen ions less than 10ppm, organic solvent residue Less than 100PPM. After the hydrochloric acid is concentrated in the intermediate chamber, the co-produced hydrobromic acid meets the index requirements of GB / T 621-2015 chemical reagent hydrobromic acid. The device has been running stably and continuously for 150 days, and the anion and cation membranes have no obvious deterioration such as perforation.
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Abstract
The invention discloses a method for preparing and co-producing hydrohalic acid by four-chamber three-membrane electrolysis of short-chain quaternary ammonium bases. Under the action of the anion membrane, the halogen ions selectively move to the middle chamber through the anion membrane, and combine with the hydrogen cations migrated from the anode chamber to form a hydrohalic acid; the quaternary ammonium cations in the raw material chamber selectively migrate to the cathode chamber through the cation membrane under the action of the potential, The hydroxide anions in the cathode chamber are combined with the quaternary ammonium cations migrated from the raw material chamber to obtain the product short-chain quaternary ammonium base; (2) After the feed liquid in the cathode chamber reaches 25% concentration, the continuous part is taken out to obtain the product high-purity short-chain quaternary ammonium base Ammonium alkali aqueous solution; (3) The raw material room is continuously supplemented with a halogenated short-chain quaternary ammonium salt solution, and the material liquid in the middle room reaches a concentration of 10%. The continuous part is taken out, and the hydrohalic acid is prepared by distillation and concentration. The invention can realize the green and environmental protection requirements of producing high-purity short-chain quaternary ammonium bases by ion membrane electrolysis.
Description
technical field [0001] The invention relates to a method for preparing and co-producing hydrohalic acid by four-chamber three-membrane electrolysis of short-chain quaternary ammonium base. Background technique [0002] Since the mid-1950s, the preparation and application of zeolite molecular sieves have developed rapidly, and the comprehensive development from low-silicon-alumina to medium-silicon-alumina and even high-silicon-alumina has greatly promoted the application of molecular sieves and the development of the industry. Among them, the application of templates in synthesis has brought a qualitative leap in the synthesis of molecular sieves. Templating agents act as structural templates during the formation of molecular sieves, leading to the generation of special structures with specific catalytic functions. Some molecular sieves have only found extremely limited templates, and can even be successfully synthesized only under the action of the only matching template. ...
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