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Equipment and method for producing tetramethyl ammonium hydroxide by using continuous process

A technology of tetramethyl ammonium hydroxide and tetramethyl ammonium carbonate, applied in the direction of electrolytic organic production, cells, electrolytic components, etc., can solve the problems of large changes in electrolyte concentration, affecting product performance, increasing production costs, etc. Small change range, increased lifespan, and small equipment investment

Pending Publication Date: 2018-08-14
柏川新材料科技(宁波)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the above method, water or dilute tetramethylammonium hydroxide is used as the catholyte in the electrolysis process, and the concentration of the electrolyte changes greatly during the electrolysis process, which not only affects the product performance but also reduces the life of the diaphragm and increases the production cost.

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  • Equipment and method for producing tetramethyl ammonium hydroxide by using continuous process

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Embodiment 1

[0032] Tetramethylammonium carbonate is the raw material, and the concentration of tetramethylammonium carbonate in the anolyte raw material tank is 65%. In the initial stage, the concentration of tetramethylammonium carbonate is 35% by controlling the ratio of raw materials and water in the anolyte intermediate tank. , and then inject this solution into the anode chamber for electrolysis. As the electrolysis proceeds, the concentration of the anolyte decreases. At this time, part of the anolyte is pumped into the anolyte intermediate tank, and the anolyte intermediate tank is combined with the raw materials and water in the anolyte raw material tank. The concentration of tetramethylammonium carbonate in the tank is 35%, and then this solution is replenished to the anode chamber, so that the anolyte concentration in the anode chamber is kept between 25-30% in circulation. The concentration of tetramethylammonium hydroxide in the cathode chamber continues to rise with the electr...

Embodiment 2

[0034] Tetramethylammonium carbonate is the raw material, and the concentration of tetramethylammonium carbonate in the anolyte raw material tank is 65%. In the initial stage, the concentration of tetramethylammonium carbonate is 35% by controlling the ratio of raw materials and water in the anolyte intermediate tank. , and then inject this solution into the anode chamber for electrolysis. As the electrolysis proceeds, the concentration of the anolyte decreases. At this time, part of the anolyte is pumped into the anolyte intermediate tank, and the anolyte intermediate tank is combined with the raw materials and water in the anolyte raw material tank. The concentration of tetramethylammonium carbonate in the tank is 35%, and then this solution is replenished to the anode chamber, so that the circulation keeps the anolyte concentration in the anode chamber between 25-30%. The concentration of tetramethylammonium hydroxide in the cathode chamber continues to rise as the electroly...

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Abstract

The invention provides equipment and a method for producing tetramethyl ammonium hydroxide by using a continuous process, and relates to the technical field of tetramethylammonium hydroxide production. The equipment and method for producing the tetramethyl ammonium hydroxide by using the continuous process are characterized in that an electrolytic cell structure with one membrane and two chambersis adopted, as for the anode part, an anode liquid is supplemented through an anode liquid intermediate tank, so that the concentration of the anode liquid in an anode chamber is small in change amplitude in the electrolysis process; and as for the cathode part, through a nanofiltration device, the concentration of the tetramethyl ammonium hydroxide in a cathode liquid is concentrated by utilizingthe interception capability of a nanofiltration membrane to the hydroxyl, the concentration ratio is controlled, the concentrated liquid enters a product tank, and a penetrating fluid enters the cathode liquid, so that the concentration change amplitude of the tetramethyl ammonium hydroxide in the cathode liquid is small. According to the equipment and the method for producing the tetramethyl ammonium hydroxide by using the continuous process, the technology and the equipment are simple, the occupied area of a reactor is small, and the equipment investment is small; and the concentration change amplitude of the anode liquid and the cathode liquid in the electrolysis process is small through blending of the anode liquid intermediate tank and the cathode liquid nanofiltration device, the process is stable, the damage to the ion membrane is small, and the service life of the membrane can be prolonged.

Description

technical field [0001] The invention relates to the technical field of tetramethylammonium hydroxide production, in particular to a device for continuously producing tetramethylammonium hydroxide. Background technique [0002] Tetramethylammonium hydroxide is an important organic base, which has two characteristics: (1) The decomposition temperature is low, and it becomes gas after decomposition without residue; (2) It is an organic strong base itself, with strong alkalinity, Without metal ions, the above characteristics make it an important application in the electronics manufacturing industry. In the electronics manufacturing industry, the content of metal ion impurities and anion impurities in tetramethylammonium hydroxide is required to be low, such as a single metal ion impurity lower than 1ppb, and anion impurity ions lower than 50ppb. [0003] The current method of producing tetramethylammonium hydroxide is mainly electrolysis. It is made in two steps: the first ste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B3/00C25B9/08C25B9/19
CPCC25B3/00C25B9/19
Inventor 梁小朝姚浩川
Owner 柏川新材料科技(宁波)有限公司
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