Preparation method for electronic grade tetramethylammonium hydroxide on industrial scale
A technology of tetramethyl ammonium hydroxide and tetramethyl ammonium bicarbonate, applied in electrolysis process, electrolysis components, electrolysis organic production and other directions, can solve the problems of simplicity and no description of the electrolysis process, and achieves high current efficiency and operation. Conditionally stable effects
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[0040] Example 1
[0041] The raw material with a concentration of 65.0% tetramethylammonium bicarbonate is injected into the anolyte circulation tank at a flow rate of 287.0kg / h. The concentration of the anode circulation solution into the electrolytic cell is 35.0%, and the flow rate of the anode circulation pump is 10.0m 3 / h, the temperature of the ion-exchange membrane electrolyzer is controlled at 50℃, the concentration of the cathode circulating liquid is 25.8%, and the flow rate of the cathode circulating pump is 15.0m 3 / h, the flow rate of high-purity water into the cathode circulation tank is 262kg / h, and the current density of the electrolytic tank is 1.5kA / m 2 , The outlet concentration of the product TMAH is 25.8%, the flow rate is 487.8kg / h, the product is tested by ICP-MS, the content of each metal ion is less than 1ppb, and the CO in the product 3 2- And NO 3 - The content is less than 50ppb, and the product meets the quality requirements of electronic grade product...
Example Embodiment
[0042] Example 2
[0043] Feed the 55.0% tetramethylammonium bicarbonate raw material into the anolyte circulation tank at a flow rate of 339.5kg / h. The concentration of the anode circulation solution into the electrolytic cell is 25.0%, and the flow rate of the anode circulation pump is 7.0m. 3 / h, the temperature of the ion-exchange membrane electrolyzer is controlled at 70℃, the concentration of the cathode circulating liquid is 26.5%, and the flow rate of the cathode circulating pump is 9.0m 3 / h, the flow rate of high-purity water into the cathode circulation tank is 262kg / h, and the current density of the electrolytic tank is 1.0kA / m 2 , The outlet concentration of the product TMAH is 26.5%, the flow rate is 475.0kg / h, the product has been tested by ICP-MS, the content of each metal ion is less than 1ppb, and the CO in the product 3 2- And NO 3 - The content is 150 and 350ppb respectively, and the product does not meet the quality requirements of electronic grade products.
Example Embodiment
[0044] Example 3
[0045] Feed the tetramethylammonium bicarbonate raw material with a concentration of 59.3% into the anolyte circulation tank at a flow rate of 315kg / h. The concentration of the anode circulation solution into the electrolytic cell is 28%, and the flow rate of the anode circulation pump is 7.0m. 3 / h, the temperature of the ion-exchange membrane electrolyzer is controlled at 55℃, the concentration of the cathode circulating liquid is 25.0%, and the flow rate of the cathode circulating pump is 8.0m 3 / h, the flow of high-purity water into the cathode circulation tank is 262kg / h, and the current density of the electrolytic tank is 0.8kA / m 2 , The outlet concentration of the product TMAH is 25.2%, the flow rate is 500kg / h, the product is tested by ICP-MS, the content of each metal ion is less than 1ppb, and the CO in the product 3 2- And NO 3 - The content is less than 50ppb, and the product meets the quality requirements of electronic grade products.
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