Method for synthesizing and purifying electronic-grade hydrogen peroxide

A purification method, hydrogen peroxide technology, applied in chemical instruments and methods, peroxides/peroxyhydrates/peroxyacids/superoxides/ozone oxides, electrodes, etc., can solve the problems of low added value of hydrogen, etc. The effect of low production cost and simple process flow

Pending Publication Date: 2022-07-12
CHEM & CHEM ENG GUANGDONG LAB
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the electrochemical method also has technical disadvantages, such as the low added value of hydrogen precipitated by the cat...

Method used

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  • Method for synthesizing and purifying electronic-grade hydrogen peroxide
  • Method for synthesizing and purifying electronic-grade hydrogen peroxide

Examples

Experimental program
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Embodiment 1

[0026] Embodiment 1: adopt the electronic grade hydrogen peroxide synthesis and purification method of bismuth vanadate method

[0027] In this embodiment, the electrolyzers, evaporators and rectification towers in the main production equipment are provided with ordinary high-purity fusible polytetrafluoroethylene PFA as the inner lining to avoid contamination of hydrogen peroxide and ensure stability. Among them, the electrolytic cell adopts doped bismuth vanadate single crystal as the anode material, nickel-based alloy as the cathode material, and the cathode and the anode are separated by a proton exchange membrane. The evaporator adopts a falling film evaporator, and the rectification column adopts a primary rectification column. The ultra-purification step is distillation, and the lining of the evaporator and the rectifying tower is made of special ultra-pure electronic grade PFA material. The applied bias voltage is 2.7V, and the current density during electrolysis is 0...

Embodiment 2

[0031] Embodiment 2: adopt the electronic grade hydrogen peroxide synthesis and purification method that the bismuth vanadate method and the oxygen cathode reduction method are combined

[0032] Based on the structure of the main production equipment in Example 1, in this example, the cathode of the electrolysis cell was changed to a carbon-based material, that is, graphite / carbon black / polytetrafluoroethylene composite, and the applied bias voltage was reduced to 2.5V, and the current during electrolysis Density is 0.25A / cm 2 .

[0033] like figure 2 As shown, on the basis of the flow process of Example 1, the electrolytic solution flows through the electrolytic cell to generate an electrolysis reaction, and the high-purity oxygen 213 of the raw material that feeds into the cathode generates an oxygen reduction reaction to obtain hydrogen peroxide, and the anode generates a two-electron water oxidation reaction and also obtains. Hydrogen oxide; when the hydrogen peroxide c...

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Abstract

The invention discloses an electronic grade hydrogen peroxide synthesis and purification method, which comprises the following steps: a synthesis process and a purification process, the synthesis process is an electrolysis process, when the concentration of hydrogen peroxide in the electrolysis process reaches 0.5-2 wt%, an electrolyte containing hydrogen peroxide is subjected to purification process treatment, and the purification process comprises the steps of distillation and ultra-purification. Electronic-grade hydrogen peroxide meeting the SEMI G2 standard can be prepared through the distillation process step, and ultra-pure electronic-grade hydrogen peroxide meeting the SEMI G3, G4 and G5 standard or with higher purity can be produced through the further ultra-purification step. The method has the beneficial effects that relatively low-cost high-purity water and high-purity oxygen are adopted as raw materials, the total organic carbon content in the prepared hydrogen peroxide can be ignored, after inorganic impurities are efficiently removed through a mature distillation process, the electronic-grade hydrogen peroxide with higher purity is prepared by further utilizing an ultra-purification process, and the method is suitable for industrial production. The process flow is simple, the production cost is low, and potential industrial application value is achieved.

Description

technical field [0001] The invention relates to the field of wet electronic chemicals, in particular to a method for synthesizing and purifying electronic-grade hydrogen peroxide using an electrolysis method to synthesize high-quality hydrogen peroxide as a raw material. Background technique [0002] Hydrogen peroxide (aqueous hydrogen peroxide solution) is an important chemical raw material with clean and non-polluting properties. It is widely used in printing and dyeing, papermaking, environmental protection, food, chemical synthesis and semiconductor industries. The industrial production methods of hydrogen peroxide include barium peroxide method, ammonium persulfate method, anthraquinone method, isopropanol method and oxygen cathode reduction method. Among them, the anthraquinone method is the mainstream industrial production method at home and abroad, and its total chemical reaction equation is H 2 +O 2 =H 2 O 2 , its advantages are mature technology, high degree of...

Claims

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Application Information

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IPC IPC(8): C25B1/30C25B11/042C30B29/30C01B15/013
CPCC25B1/30C25B11/042C30B29/30C01B15/013C01P2006/80Y02P20/54Y02E60/36
Inventor 李国岭
Owner CHEM & CHEM ENG GUANGDONG LAB
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