A catalyst charging device for producing hydrogen peroxide

Abstract

The utility model provides a catalyst feeding device for producing hydrogen peroxide, which comprises a feeding hopper (1), a feeding valve (2) connected with the feeding hopper (1), a feeding tank (3) connected with the feeding valve (2), a vent valve (4) connected with the feeding tank (3), a nitrogen supply system (5) connected with the feeding tank (3), a feeding pipe (6) connected with the feeding tank (3) and a working liquid inlet pipe of a hydrogenation tower, a feeding control valve (7) arranged on the feeding pipe (6), a liquid feeding pipe (8) connected with the working liquid inlet pipe of the hydrogenation tower and the feeding tank (3), and a control valve (9) arranged on the liquid feeding pipe (8). The technical scheme provided by the utility model does not affect the normal operation of the system during the process of adding catalyst into the hydrogenation tower, can realize online addition of catalyst, is convenient to operate, and uses nitrogen to protect the catalyst during the addition process, so the safety is high.

Description

Technical Field

[0001] This utility model relates to the field of hydrogen peroxide production technology, and in particular to a catalyst feeding device for producing hydrogen peroxide. Background Technology

[0002] Hydrogen peroxide is an oxidant with wide applications in the chemical industry. Currently, industrially, hydrogen peroxide is generally produced using the anthraquinone process. In this process, 2-ethylanthraquinone, 2-butylanthraquinone, 2-pentylanthraquinone, or mixtures thereof are typically used as a carrier, and a mixture of heavy aromatics, trioctyl phosphate, o-methylcyclohexyl acetate, tetrabutylurea, or diisobutylmethanol is used as a solvent. The carrier and solvent are combined in a specific ratio to form the working solution. The working solution circulates in the system in the order of hydrogenation, oxidation, extraction, and post-treatment, producing hydrogen peroxide. In the hydrogenation step, the working solution undergoes a hydrogenation reaction under the action of a catalyst to obtain a hydrogenated solution. In the oxidation step, the hydrogenated solution reacts with oxygen to obtain an oxidized solution. In the extraction step, hydrogen peroxide in the oxidized solution is extracted with water to obtain crude hydrogen peroxide; the working solution flowing out of the extraction step is called the raffinate. In the post-treatment step, the raffinate undergoes dehydration, hydrogen peroxide removal, and regeneration of degradation products before entering the working solution storage tank, completing one cycle.

[0003] Depending on the reactor type used in the hydrogenation process, the anthraquinone process for producing hydrogen peroxide can be divided into fixed-bed and fluidized-bed processes. Currently, most hydrogen peroxide production plants in my country use the traditional fixed-bed process. Compared with the fixed-bed process, the fluidized-bed process has advantages such as uniform gas-liquid-solid three-phase mixing, good catalyst dispersion, high catalyst utilization, and good mass and heat transfer. It also has higher hydrogenation efficiency and less degradation of effective anthraquinone, making it suitable for large-scale hydrogen peroxide plants.

[0004] The catalyst used in the fluidized bed hydrogenation process is in powder form, typically palladium or nickel. Because the catalyst in the hydrogenation section requires periodic and quantitative regeneration, and there is some loss during production, it needs to be replenished periodically. Furthermore, dry hydrogenation catalyst poses a fire risk when exposed to hydrogen gas, and adding catalyst to the hydrogenation tower carries certain safety risks. Therefore, developing a catalyst feeding device for hydrogen peroxide production that allows for online catalyst addition would significantly improve operational convenience and safety, greatly promoting the development of hydrogen peroxide production technology. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a catalyst feeding device for the production of hydrogen peroxide, which can improve the convenience and safety of operation.

[0006] To solve the above-mentioned technical problems, the present invention provides a catalyst feeding device for producing hydrogen peroxide, comprising a feeding hopper, a feeding valve connected to the outlet of the feeding hopper, a feeding tank connected to the outlet of the feeding valve, a vent valve connected to the feeding tank, a nitrogen supply system connected to the feeding tank, a discharge pipe with one end connected to the feeding tank and the other end connected to the working liquid inlet pipe of the hydrogenation tower, a discharge control valve disposed on the discharge pipe, a liquid feeding pipe with one end connected to the working liquid inlet pipe of the hydrogenation tower and the other end connected to the feeding tank, and a control valve disposed on the liquid feeding pipe.

[0007] As a further improved technical solution, the catalyst feeding device for producing hydrogen peroxide provided by this utility model has a viewing hole in the feeding tank.

[0008] The technical solution provided by this utility model allows for the addition of catalyst into the hydrogenation tower without affecting the normal operation of the system. It enables online catalyst addition, which is convenient to operate. Nitrogen gas is used to protect the catalyst during the addition process, ensuring high safety. Attached Figure Description

[0009] The accompanying drawings are provided to further illustrate the present invention and constitute a part of this application. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an undue limitation of the present invention. In the drawings: Figure 1 This is a structural diagram of a catalyst feeding device used in the production of hydrogen peroxide, as shown in the example. Figure 2 This is a schematic diagram of the catalyst feeding device used in the production of hydrogen peroxide, as shown in the example. Figure 3 This is a structural diagram showing the connection between the liquid addition pipe and the working fluid inlet pipe in the embodiment. Implementation

[0010] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0011] like Figure 1 and Figure 2 The catalyst feeding device for producing hydrogen peroxide shown includes a feeding hopper 1, a feeding valve 2 connected to the outlet of the feeding hopper 1, a feeding tank 3 connected to the outlet of the feeding valve 2, a vent valve 4 connected to the feeding tank 3, a nitrogen supply system 5 connected to the feeding tank 3, a discharge pipe 6 with one end connected to the feeding tank 3 and the other end connected to the working liquid inlet pipe of the hydrogenation tower, a discharge control valve 7 disposed on the discharge pipe 6, a liquid inlet pipe 8 with one end connected to the working liquid inlet pipe of the hydrogenation tower and the other end connected to the feeding tank 3, and a control valve 9 disposed on the liquid inlet pipe 8. The feeding tank 3 is provided with a viewing window 10.

[0012] The working principle and operation process are as follows: Nitrogen supply system 5 fills the feeding tank 3 and feeding hopper 1 with nitrogen to perform gas replacement. After opening the vent valve 4, the replacement gas is discharged to the hydrogenation system vent gas main pipe and then the vent valve 4 and feeding valve 2 are closed. Open the feeding valve 2 and pour the catalyst into the feeding hopper 1. The solid catalyst enters the feeding tank 3 due to its gravity and good flowability. After the operation is completed, close the feeding valve 2. Open nitrogen valve 1 to pressurize the aromatics in the filter cleaning tank to the aromatics circulation tank 12; Open the control valve 9 and vent valve 4 on the liquid filling pipe 8 to inject working pressure into the feeding tank 3. Figure 3 As shown, the liquid addition pipe 8 extends to the center of the working liquid inlet pipe of the hydrogenation tower. Using the dynamic and static pressure in the working liquid inlet pipe, the working liquid is pumped into the feed tank 3. The working liquid entry is observed through the sight glass 10 on the feed tank 3. After the operation is completed, the control valve 9 and the vent valve 4 are closed. Open the unloading control valve 7 and start the nitrogen supply system 5 to introduce nitrogen into the feeding tank 3, so as to press the mixture of catalyst and working liquid in the feeding tank 3 into the working liquid inlet pipe and send it into the hydrogenation tower.

[0013] The technical solution provided by this utility model allows for the addition of catalyst into the hydrogenation tower without affecting the normal operation of the system. It enables online catalyst addition, which is convenient to operate. Nitrogen gas is used to protect the catalyst during the addition process, ensuring high safety.

[0014] The above description is merely a preferred embodiment of this utility model and does not limit this utility model in any way. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A catalyst feeding device for producing hydrogen peroxide, characterized in that, Includes a feeding hopper (1), a feeding valve (2) connected to the outlet of the feeding hopper (1), a feeding tank (3) connected to the outlet of the feeding valve (2), a vent valve (4) connected to the feeding tank (3), a nitrogen supply system (5) connected to the feeding tank (3), a discharge pipe (6) with one end connected to the feeding tank (3) and the other end connected to the working liquid inlet pipe of the hydrogenation tower, a discharge control valve (7) provided on the discharge pipe (6), a liquid inlet pipe (8) with one end connected to the working liquid inlet pipe of the hydrogenation tower and the other end connected to the feeding tank (3), and a control valve (9) provided on the liquid inlet pipe (8).

2. The catalyst feeding device for producing hydrogen peroxide according to claim 1, characterized in that, The feeding tank (3) is provided with a viewing hole (10).

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