Fluidization hydrogenation process for preparing hydrogen peroxide by anthraquinone method

Abstract

The invention provides a fluidization hydrogenation process for preparing hydrogen peroxide by an anthraquinone method. The fluidization hydrogenation process comprises the following steps: preparation of high-purity hydrogen, pretreatment of a working solution and hydrogenation reaction, in the step of preparing the high-purity hydrogen, industrial hydrogen is compressed and deoxidized and then is mixed with circulating hydrogen; wherein the temperature of the circulating hydrogen is 15-40 DEG C, the purity of the high-purity hydrogen is greater than or equal to 99.99%, the oxygen content isless than or equal to 50ppm, and a dew point is -70 DEG C; in a hydrogenation reaction, the sample injection pressure of high-purity hydrogen is 0.22 Mpa, and the gas inflow is 1500-6000 m<3> / h; wherein the flow of a working solution is 300-1200 cubic meters per hour, and the flow of the working solution is 300-1200 m<3> / h. According to the fluidized hydrogenation process for preparing the hydrogen peroxide by the anthraquinone method, the addition amount of the catalyst is reduced, the hydrogenation depth can be regulated and controlled, various phenomena such as bias flow of a working solution and catalyst caking are prevented, the hydrogen efficiency is improved, favorable conditions are created for subsequent extraction, the productivity of a device is increased, and the investment isreduced.

Description

technical field [0001] The invention relates to a hydrogenation process, in particular to a fluidized hydrogenation process for preparing hydrogen peroxide by an anthraquinone method, and belongs to the technical field of hydrogen peroxide production. Background technique [0002] Hydrogen peroxide is one of the important products of the inorganic salt industry and is a strong oxidizing agent. There are many methods for producing hydrogen peroxide, including electrolysis, isopropanol method, hydrogen-oxygen direct synthesis method, anthraquinone method, etc., among which the anthraquinone method is the most widely used. [0003] The production of hydrogen peroxide by anthraquinone method mainly includes hydrogenation unit, oxidation unit, extraction unit and post-treatment unit, the most important of which is the hydrogenation unit. In the process of producing hydrogen peroxide by anthraquinone method, the main form of domestic hydrogenation reactor is fixed bed. The fixed ...

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Problems solved by technology

However, its disadvantages are also very obvious. The main reason is that the amount of catalyst is too much at one time, the speed of hydrogen diffusion to the working fluid and catalyst surface is low, the catalyst surface utilization rate is low, the hydrogenation depth is difficult to control, and it is easy to overhydrogenate, resulting in the precipitation of anthraquinone. , prone to various phenomena such as working fluid bias flow and catalyst agglomeration

The hydrogen efficiency is low, usually controlled at 5.5g / L-7.5g / L, and it is difficult for the subsequent extraction unit to directly obtain high-concentration hydrogen peroxide

The low efficiency of hydrogen also limits the capacity of the device and requires a lot of investment in equipment

[0004] The Chinese patent with the authorized notification number CN103708426B discloses an anthraquinone hydrogen peroxide production device, which adopts liquid phase circulation, and the catalyst is entrained in the liquid phase circulation, which will inevitably cause rapid wear and tear of the pump equipment. The injector uses liquid phase As the main power, the flow rate is relatively low, the flow rate of hydrogen extraction is limited, and its hydrogen efficiency is above 25g / L. Such a high hydrogen efficiency can easily cause overhydrogenation and serious loss of working fluid.

[0005] The Chinese patent with the publication number CN109678119A discloses a system for producing hydrogen peroxide by anthraquinone method and a method for producing hydrogen peroxide by anthraquinone method. It adopts a fixed bed process. Although it has been improved, there are still problems such as uneven distribution of gas phase and liquid phase, and hydrogen The efficiency is low, only 8-9g / L, the reaction speed is slow, and the parts such as flow guides and fillers involved are replaced frequently, which increases the risk and cost during the replacement of flow guides and fillers.

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