Oxidation method of hydrogen peroxide production process

Abstract

The invention discloses an oxidation method of a hydrogen peroxide production process. The method comprises: firstly, contacting a hydrogen-peroxide-producing hydrogenated liquid in an anthraquinone method with an oxygen-containing gas in a preprocessor to form an intermediate association complex; then performing a corresponding oxidation reaction on a material containing the intermediate association complex, according to the hydrogenation effect and the tetrahydroanthraquinone content; and finally allowing the oxidation product to undergo gas-liquid separation and to be led out of an apparatus for the next process. The method allows the hydrogenation reaction to reach proper standing time, so that the oxidation reaction rate is greatly increased, decomposition of hydrogen peroxide is reduced, complete oxidation time is shortened, and the oxidation yield is improved.

Description

technical field [0001] The invention relates to an oxidation method in the production process of hydrogen peroxide, in particular to a high-efficiency oxidation method for producing hydrogen peroxide by a large-scale anthraquinone method. Background technique [0002] The anthraquinone method is currently the main method for producing hydrogen peroxide. It uses 2-ethylanthraquinone (EAQ) as the working carrier, and heavy aromatics (Ar), trioctyl phosphate (TOP) or other components as the working solvent to prepare the working solvent. The hydrogen peroxide product is obtained through anthraquinone hydrogenation, hydrogen anthraquinone oxidation, pure water extraction and working fluid post-treatment. [0003] In the whole process of hydrogen peroxide production, the hydrogen anthraquinone oxidation process is an automatic oxidation reaction between air and hydrogenated liquid in the oxidation reactor. The reaction process is carried out between hydrogenated liquid and a larg...

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Problems solved by technology

[0005] There are several problems in the oxidation reaction: (1) The hydrogenation solution with high tetrahydroanthraquinone content has a slow oxidation reaction, and it takes a long time to achieve complete oxidation, and the residence time of the material in the oxidation tower is long. The gas-liquid parallel flow reaction technology will cause the volume of the oxidation tower to be particularly large. When the scale is further enlarged, there will be various problems in the production, processing and operation of the tower equipment. The decomposition of hydrogen peroxide and many side reactions have adverse consequences; (2) The oxidation reaction is a gas-liquid mass transfer reaction, which generally uses oxygen in the air. Gradual consumption reduces the concentration, especially for hydrogenated liquids with high hydrogen efficiency, the oxidation rate is extremely low when the subsequent oxidation is almost complete, and measures need to be taken to further increase the oxidation rate

But in fact, as the oxidation reaction proceeds, the micron-sized bubbles will quickly grow into large bubbles, greatly reducing the oxidation rate, and the tail oxygen content is high, posing a safety hazard; the micron-sized bubbles involved in the formation process of the micron Porous membranes, microporous sieve plates, and micron-scale channels require high investment and are not suitable for large-scale industrial applications; for large-scale devices, the circulating volume of working fluid and the flow rate of oxygen-containing gas are very large, and the number of microreactors There are quite a lot, so it is not suitable for the application of large-scale equipment; the content of hydroanthraquinone in the hydrogenation solution with high hydrogen efficiency is high, and it is easy to cause hydroanthraquinone to precipitate and block, especially the problem of blockage of microreactor is not easy to handle and solve at present

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