Hydrogenation method for preparing hydrogen peroxide by adopting anthraquinone process

Abstract

The invention relates to a hydrogenation method for preparing hydrogen peroxide by adopting an anthraquinone process. The hydrogenation method comprises the following steps: introducing gas containing hydrogen gas and an anthraquinone working liquid into a fluidized bed of solid particles containing a catalyst, wherein the hydrogenation pressure is 0.15-0.35MPa, and the hydrogenation temperature is 40-75 DEG C; and keeping bubbles or turbulent flow in the fluidized bed in the hydrogenation process, wherein the total linear speed of the hydrogen-containing gas is 2-30cm / s, the hydrogen gas accounts for 40-100% of the total volume of the gas, and the rest is nitrogen gas, the concentration of a settling bed of the fluidized bed is not lower than 0.3g / cm<3>, the solid particle density in the fluidized bed is less than 0.3g / cm<3>, the particle size distribution range is 20-300 microns, the concentration of anthraquinone in the anthraquinone working liquid is 120-200g / L. After the hydrogenation method disclosed by the invention is adopted, the production efficiency can be improved by 40% on the basis of an existing domestic fixed bed hydrogenation method; risk factors in the production are substantially solved from the production principle and the production process, so that the product concentration is improved to over 40% from 30%; main product quality indexes such as the content of organic carbon and the content of nonvolatile matters are better than the quality indexes of a product produced by adopting a fixed bed process.

Description

[technical field] [0001] The present invention relates to the hydrogenation method in the preparation of hydrogen peroxide by anthraquinone method. [Background technique] [0002] In the prior art, the preparation of hydrogen peroxide is generally realized by the anthraquinone method. The anthraquinone method uses 2-ethylanthraquinone as a carrier, palladium (or nickel) as a catalyst, and is formed by H 2 and O 2 direct synthesis of H 2 o 2 . It is divided into four processes: hydrogenation, oxidation, extraction and post-treatment. [0003] The hydrogenation process generally adopts a fixed-bed process, using alkyl anthraquinone as a carrier, and using heavy aromatics and tetrabutylurea as a solvent to form a working solution. Under certain pressure, temperature and the presence of a palladium catalyst, the working fluid undergoes a hydrogenation reaction with hydrogen to generate a solution containing the corresponding alkylhydroanthraquinone (referred to as the hydr...

AI Technical Summary

Problems solved by technology

[0005] Although the fixed bed anthraquinone production process has a large output, it also shows many shortcomings such as low production efficiency, poor product quality, high production consumption per unit product, heavy production equipment, large investment, and poor production operation safety.

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