Carclazyte bed device in hydrogen peroxide production

Abstract

According to the carclazyte bed device for hydrogen peroxide production, a first pipeline is led from a drain outlet in the bottom of a carclazyte bed to an inlet of a working solution filter pump, an outlet of the working solution filter pump passes through a working solution filter and then is led to the top of the carclazyte bed, and one to two valves are arranged on the first pipeline and the second pipeline to facilitate control; through the first pipeline and the second pipeline, external circulating filtration of the carclazyte bed is realized by utilizing the existing equipment such as the working solution filter pump, the working solution filter and the preparation kettle, and aluminum oxide dust accumulated in the carclazyte bed is completely removed, so that adverse effects on a subsequent system are avoided. According to the carclazyte bed device, the production quality is improved, and the production cost is reduced; and meanwhile, the manual cleaning operation intensity is reduced, and personnel contact harm is avoided.

Description

Technical Field

[0001] This application belongs to the technical field of chemical equipment, and particularly relates to a clay bed device in hydrogen peroxide production. Background Art

[0002] In the process of producing hydrogen peroxide by the anthraquinone method, the clay bed plays a crucial role. The bed is filled with spherical alumina particle fillers (also known as clay), which play an adsorption and regeneration role. In the weakly alkaline environment in the bed, some degradation products generated in the working fluid can be regenerated into anthraquinone and tetrahydroanthraquinone as effective anthraquinones to continue to participate in the system reaction, thereby helping to maintain the normal operation of the system and reducing the production cost of hydrogen peroxide.

[0003] All the clay beds used in the industry are filled with clay fillers in the upper loading method. During the filling process, affected by various factors such as drop, flow rate, and internal parts, a large amount of alumina dust is generated and accumulates in the clay bed. When put into use, the accumulated alumina dust enters the system with the working fluid, increasing the load of the filtration system and shortening the filter material replacement cycle; at the same time, if there are loopholes in the filtration system, the working fluid containing alumina dust enters the hydrogenation tower, especially in a fully acidic system, and the alumina dust will react with phosphoric acid in the working fluid to form insoluble aluminum phosphate, which adheres to the surface of the catalyst and blocks the catalyst active channels, affecting the catalyst activity; if it enters the oxidation tower, it will probably cause the decomposition of hydrogen peroxide in the oxidation tower, and in severe cases, accidents such as explosion and fire will occur.

[0004] To solve this problem, the industry mostly uses methods such as external extraction with a mobile fan during the filling process or discharging the material after soaking with the working fluid for dust removal. The external extraction with a fan can only extract part of the dust. When discharging the material after soaking with the working fluid, the dust will still fall back to the surface of the clay filler particles, and only a small amount of dust at the bottom can be removed, and the dust cannot be completely removed. Summary of the Invention

[0005] To solve the above problems, this application proposes a clay bed device for hydrogen peroxide production. By using existing equipment such as the working fluid filtration pump, working fluid filter, and preparation kettle, only two pipelines need to be added, and the method of external circulation filtration of the clay bed body is adopted to completely remove the accumulated alumina dust in the clay bed, avoid adverse effects on the subsequent system, improve the production quality, and reduce the production cost; at the same time, it also reduces the manual cleaning operation intensity and avoids personnel contact hazards.

[0006] To achieve the above object, this application provides the following technical solutions:

[0007] Lead the first pipeline from the bottom sewage outlet of the clay bed to the inlet of the working fluid filtration pump;

[0008] Lead the second pipeline from the outlet of the working fluid filtration pump to the top of the clay bed after passing through the working fluid filter;

[0009] One or two valves are provided on the above-mentioned first pipeline and second pipeline for convenient control;

[0010] After the filling of the clay bed packing is completed, a small amount of material liquid is introduced and circulated by the power provided by the working fluid filtration pump. It is filtered through the working fluid filter, and the solids in the liquid are intercepted, achieving complete removal of the accumulated alumina dust in the clay bed. Description of the drawings

[0011] Figure 1 It is a schematic process flow diagram of a conventional clay bed;

[0012] Figure 2 It is a schematic process flow diagram of the clay bed device described in this application. The arrows in the figure indicate the direction of the fluid in the pipeline, and the equipment and materials are labeled.

[0013] The descriptions of the serial numbers in the above figures are as follows:

[0014] 1 is the first pipeline, 2 is the second pipeline, and 3a, 3b, 3c, 3d, 3e, 3f, 3g, 3h, 3j, 3k, 3m, 3n, etc. are all valves. Specific embodiments

[0015] Combined with the above drawings, the specific embodiments of this application are described as follows:

[0016] Figure 1 Shown is a schematic process flow diagram of a conventional clay bed. There is no direct process connection between the clay bed and equipment such as the working fluid filtration pump, the working fluid filter, and the preparation kettle.

[0017] Figure 2 It is a schematic process flow diagram of the clay bed device described in this application. The arrows in the figure indicate the direction of the fluid in the pipeline, and the equipment and materials are labeled. The specific measures for the optimized process described in this application are:

[0018] At Figure 1 On the basis of the existing equipment shown, a first pipeline 1 is led from the bottom drain of the clay bed to the inlet of the working fluid filtration pump;

[0019] The outlet of the working fluid filtration pump is led to the top of the clay bed through the working fluid filter by a second pipeline 2;

[0020] For convenient control, a valve 3e is added to the bottom drain pipe of the clay bed, a valve 3g is provided on the first pipeline 1, and valves 3b and 3n are provided on the second pipeline 2.

[0021] The method of external circulation filtration of the clay bed in this application is as follows: after the filling of the clay bed packing is completed, a small amount of material liquid is introduced, and the power is provided by the working fluid filtration pump for circulation. The liquid is filtered through the working fluid filter, and the solids in the liquid are intercepted, realizing the removal of the accumulated alumina dust in the clay bed. The specific operation steps are as follows:

[0022] Step 1: After the filling is completed, close valve 3a, valve 3b, and valve 3e, and open valve 3d and valve 3c. Feed the clay bed to 50%-60% of the total volume.

[0023] Step 2: Close valve 3d, valve 3c, valve 3f, valve 3h, and valve 3m, and open valve 3e, valve 3g, valve 3j, valve 3k, valve 3n, and valve 3b.

[0024] Step 3: Start the working fluid filtration pump. The liquid in the clay bed flows from the lower drain port, through the first pipeline 1, through the working fluid filtration pump and the working fluid filter respectively, and then through the second pipeline 2 to the top of the clay bed and flows back into the clay bed for circulation, cleaning the inner cavity of the clay bed and the clay particle packing, and taking away the accumulated alumina dust with the liquid.

[0025] Step 4: The working fluid filter will intercept solids such as alumina dust in the flowing liquid. As the circulation progresses, the filtration pressure difference gradually increases. When the pressure difference of the working fluid filter exceeds 0.1 MPa, the circulation should be stopped, the filter cloth should be replaced, and then the circulation should be restarted until the filtration pressure difference no longer increases, indicating that the accumulated alumina dust in the clay bed has been completely removed.

[0026] Step 5: Stop the working fluid filtration pump to end the circulation. Close valve 3j, valve 3n, and valve 3b, and open valve 3a and valve 3h. Using the nitrogen pressure entering from the top of the clay bed, the circulating liquid in the clay bed is pushed back into the configuration kettle through the first pipeline 1, and after cleaning, it is replenished into the system.

[0027] Step 6: After the pushing-back is completed, close valve 3g and valve 3a, and open valve 3d and valve 3c. The clay bed is refilled to start the normal working circulation. After the filter cloth of the working fluid filter is replaced, it also enters the normal working circulation, and the external circulation filtration process of the clay bed is completed.

[0028] The beneficial effects of the clay bed device described in this application are as follows:

[0029] Through the method of external circulation filtration of the clay bed, the alumina dust accumulated in the clay bed due to the filling of the packing is completely removed, and it will not enter the subsequent process with the normal process materials, avoiding adverse effects on the subsequent system, improving the production quality, and reducing the production cost; at the same time, it also reduces the manual cleaning operation intensity and avoids personnel contact hazards.

Claims

1. A clay bed device in hydrogen peroxide production, characterized in that: Lead the first pipeline (1) from the bottom sewage outlet of the clay bed to the inlet of the working fluid filtration pump. After passing through the working fluid filter, lead the second pipeline (2) from the outlet of the working fluid filtration pump to the top of the clay bed. One or two valves are provided on the first pipeline (1) and the second pipeline (2).

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