Efficient hydrogenation process and system for producing hydrogen peroxide through anthraquinone method

Abstract

The invention discloses an efficient hydrogenation process and system for producing hydrogen peroxide through an anthraquinone method. The efficient hydrogenation process comprises the following contents: (1) total hydrogen of the hydrogenation process is divided into two paths, namely hydrogen I and hydrogen II; the hydrogen I and a working solution enter hydrogen dissolving equipment, and thus the hydrogen I is dissolved in the working solution to obtain a hydrogen-dissolved working solution; (2) the hydrogen-dissolved working solution and the hydrogen II enter a mixer containing a ceramic membrane tube bundle, wherein the hydrogen-dissolved working solution enters the shell side outside the tube bundle, the hydrogen II enters the tube pass side inside the tube bundle, the hydrogen II radially passes through the tube wall of the ceramic membrane tube bundle to be dispersed into nano-sized / micron-sized minute bubbles, and the nano-sized / micron-sized minute bubbles act with the hydrogen-dissolved working solution on the shell side to obtain a microemulsion fluid; and (3) the microemulsion fluid enters a liquid phase hydrogenation reactor filled with a hydrogenation catalyst, a hydrogenation reaction is conducted, and a hydrogenation reaction product enter into the next procedure. According to the efficient hydrogenation process, by controlling the two different states of hydrogen in the working solution, the whole hydrogenation reaction is conducted in the liquid phase, the uniformity of the reaction is ensured while the hydrogenation reaction efficiency is improved, the side reaction is effectively controlled, and the anthraquinone consumption is greatly lowered.

Description

technical field [0001] The invention relates to a high-efficiency hydrogenation process and system in the process of producing hydrogen peroxide by anthraquinone method. Background technique [0002] In the process of producing hydrogen peroxide by anthraquinone method, the hydrogenation process of anthraquinone hydrogenation is the core unit of the whole hydrogen peroxide production process. The result of hydrogenation reaction directly affects the quality level of working fluid, product concentration and production scale of the device. The main indicators of inferiority are technical indicators such as hydrogen efficiency, number of side reactions, and catalyst production capacity per ton. [0003] The general anthraquinone hydrogenation reaction in the prior art is a gas-liquid-solid three-phase trickle bed reaction. The reaction temperature is generally 45-75°C, the reaction pressure is generally 0.2-0.4MPa, the gas is the continuous phase, and the liquid passes through...

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Problems solved by technology

The reaction temperature is generally 45-75°C, the reaction pressure is generally 0.2-0.4MPa, the gas is the continuous phase, and the liquid passes through the solid catalyst in the form of a thin liquid film. The following problems exist in this process: (1) Hydrogen first passes through the gas phase The main body diffuses to the phase interface, then dissolves on the phase interface, and then diffuses from the phase interface to the liquid phase main body. The hydrogenation reaction occurs on the surface of the catalyst in the liquid phase main body. The entire hydrogenation reaction process is controlled by external diffusion, while the gas / liquid The diffusion and mass transfer resistance of the membrane is relatively large, and the diffusion and mass transfer rate is low, resulting in a low hydrogenation reaction rate, that is, when a certain production capacity is reached, the catalyst space velocity required is small and the residence time is long; (2) Hydrogen generally flows from the top of the reactor once or Adding multiple times, and hydrogen is a continuous phase, even adding according to the chemical hydrogen consumption of the production capacity will cause a large excess of hydrogen in the early and middle stages of the reaction, and the excess hydrogen will cause excessive hydrogenation side reactions, resulting in low actual production capacity and consumption of anthraquinone High, poor quality of working fluid, large consumption of alumina and other problems

This method only turns hydrogen into a dispersed phase and disperses it in the working liquid, but it is essentially a traditional gas-liquid-solid three-phase hydrogenation process. During the hydrogenation reaction, there is still mass transfer resistance of the gas / liquid film. For the hydrogenation reaction No substantial improvement and increase in speed

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