Method for producing hydrogen peroxide by anthraquinone process

Abstract

The invention provides a process for producing hydrogen peroxide by using an anthraquinone method. The process includes the following steps: hydrogen is added in the anthraquinone to generate anthrahydroquinone which is oxidized to generate the anthraquinone and the hydrogen peroxide. The reaction in which the hydrogen is added in the anthraquinone to generate anthrahydroquinone means that working fluid with the anthraquinone and the hydrogen are led in a fixed bed reactor which is filled with catalyst with the hydrogen so that hydrogenation is generated between the working fluid with the anthraquinone and the hydrogen to generate the anthrahydroquinone under the effect of the catalyst; the obtained hydrogenated working fluid with the anthrahydroquinone is conducted out of an oxidation device, wherein, when the working fluid with the anthrahydroquinone and the hydrogen are conducted in the fixed bed reactor, the working fluid is continuous phase, in which the hydrogen is distributed in the form of bubbles; when the working fluid with the anthrahydroquinone and the hydrogen are conducted in the fixed bed reactor, a feeding inlet is made not higher than a discharging outlet where the hydrogenated liquid is discharged out of the fixed bed reactor. By using the method, utilization efficiency of the catalyst as well as the production capability of the reactor is promoted and bed resistance is reduced.

Description

technical field [0001] The invention relates to a method for producing hydrogen peroxide by an anthraquinone method, in particular to a method for using a fixed-bed reactor to carry out hydrogenation reaction of anthraquinone and further producing hydrogen peroxide. The invention also relates to a device for carrying out the method. Background technique [0002] Hydrogen peroxide (hydrogen peroxide) is an important inorganic chemical raw material. At present, the method for industrially producing hydrogen peroxide is mainly the anthraquinone method. The main process of producing hydrogen peroxide by anthraquinone method is as follows: a certain proportion of anthraquinone working liquid and hydrogen gas are passed into the hydrogenation tower, and a catalyst is installed in the hydrogenation tower. Under the action of the catalyst, the anthraquinone in the working liquid is hydrogenated to form anthracene Hydroquinone, and then the hydrogenated working liquid (hydrogenated ...

AI Technical Summary

Problems solved by technology

The existing fixed-bed reactor technology uses a vertical reactor, and hydrogen and working fluid are fed from the top of the fixed-bed reactor. In this feeding method, the gas phase in the reactor is a continuous phase, and the liquid phase is sprayed from the top. Under the action of gravity, the fixed bed falls in a trickle shape, which is called a trickle bed. To participate in the reaction, gas phase hydrogen needs to pass through the liquid phase mass transfer to reach the surface of the catalyst. The mass transfer resistance of gas phase hydrogen is large, which is not conducive to the hydrogenation reaction. At the same time, due to the uneven distribution of the liquid phase axis and radial direction, it will lead to low local utilization efficiency of the reactor, local overhydrogenation of the catalyst bed will lead to agglomeration, and further aggravate the bias flow so that the bed resistance will rise rapidly and the production operation will not be possible.

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