An apparatus for cleaning a hydrogen peroxide filter of a fluidized bed production

Abstract

The utility model provides a device for cleaning hydrogen peroxide filter of fluidized bed production, including circulating filter (1), the cleaning pipe (2) who is connected with circulating filter (1), nitrogen supply pipe (3), pure water supply pipe (4), steam supply pipe (5), acid liquid supply mechanism (6) and lye supply mechanism (7) with the communication of cleaning pipe, the filter cleaning tank (8) who is connected with circulating filter (1), the heat exchanger (9) with the communication of filter cleaning tank, the aromatic hydrocarbon circulating tank (11) that backflow pipe (10) is connected with the liquid outlet of heat exchanger through backflow port, the aromatic hydrocarbon circulating pump (12) that liquid inlet is communicated with aromatic hydrocarbon circulating tank (11), liquid outlet is communicated with cleaning pipe (2), the blowdown pipe (13) that is connected with backflow pipe (10), acid liquid backflow pipe (14) and lye backflow pipe (15). The technical scheme provided by the utility model can improve the flux performance of filter core and prolong the service life.

Description

Technical Field

[0001] This utility model relates to the field of hydrogen peroxide production technology, and in particular to an apparatus for cleaning a fluidized bed hydrogen peroxide production filter. 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] Hydrogen peroxide is produced using a fluidized bed process. The catalyst used in the fluidized bed hydrogenation step is in powder form, typically palladium or nickel. Since the catalyst is dispersed in the fluidized bed, it must be filtered using a high-precision filter to prevent it from entering subsequent processes and posing safety hazards. The filter needs to be cleaned regularly, and the effectiveness of this cleaning determines the filter's throughput, thus affecting the system's production load.

[0005] Therefore, cleaning the fluidized bed catalyst filter is essential. If a device for cleaning fluidized bed hydrogen peroxide production filters can be developed, it can effectively remove impurities such as catalyst residues and degradation products adhering to the filter element surface, significantly improve the filter element's throughput performance, and effectively ensure the stability of system operation. Utility Model Content

[0006] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a device for cleaning a fluidized bed hydrogen peroxide production filter, which can effectively remove impurities such as catalyst residues and degradation products attached to the surface of the filter element, significantly improve the flow performance of the filter element, and effectively ensure the stability of system operation.

[0007] To solve the above-mentioned technical problems, the present invention provides an apparatus for cleaning a fluidized bed hydrogen peroxide filter, comprising a circulating filter, a cleaning pipe connected to the inlet of the circulating filter, a nitrogen supply pipe, a pure water supply pipe, a steam supply pipe, an acid supply mechanism, and an alkali supply mechanism connected to the cleaning pipe, a filter cleaning tank connected to the outlet of the circulating filter, a heat exchanger whose inlet is connected to the filter cleaning tank, an aromatics circulation tank whose reflux port is connected to the outlet of the heat exchanger via a reflux pipe, an aromatics circulation pump whose inlet is connected to the aromatics circulation tank and whose outlet is connected to the cleaning pipe, and a drain pipe, an acid reflux pipe, and an alkali reflux pipe connected to the reflux pipe.

[0008] As a further improved technical solution, the apparatus for cleaning a fluidized bed to produce hydrogen peroxide filters provided by this utility model includes an acid supply mechanism comprising an acid circulation tank and an acid circulation pump connected to the acid circulation tank; and an alkali supply mechanism comprising an alkali circulation tank and an alkali circulation pump connected to the alkali circulation tank.

[0009] Based on the aforementioned improvement scheme, as a further improved technical solution, the device for cleaning fluidized bed hydrogen peroxide production provided by this utility model has the acid circulation tank and the alkali circulation tank as the same tank body, and the tank is divided into an acid side and an alkali side.

[0010] The technical solution provided by this utility model cleans the filter element of a fluidized bed hydrogen peroxide production filter using aromatics, pure water, steam, alkaline solution, acid solution, and nitrogen. This effectively removes impurities such as catalyst residues and degradation products adhering to the filter element surface, significantly improving the filter element's throughput performance and effectively ensuring the stability of system operation. This not only extends the filter element's service life but also provides reliable support for the continuity and efficiency of the production process. The filter element is then acid-washed after alkaline washing, eliminating the safety hazards caused by the alkaline nature of the filter element. Attached Figure Description

[0011] 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 schematic diagram of the apparatus for cleaning a fluidized bed hydrogen peroxide filter, as shown in the example. Implementation

[0012] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0013] like Figure 1 The apparatus shown for cleaning a fluidized bed hydrogen peroxide filter includes a circulating filter 1, a cleaning pipe 2 connected to the inlet of the circulating filter 1, a nitrogen supply pipe 3, a pure water supply pipe 4, a steam supply pipe 5, an acid supply mechanism 6, and an alkali supply mechanism 7 connected to the cleaning pipe 2, a filter cleaning tank 8 connected to the outlet of the circulating filter 1, a heat exchanger 9 whose inlet is connected to the filter cleaning tank 8, an aromatics circulation tank 11 whose reflux port is connected to the outlet of the heat exchanger 9 via a reflux pipe 10, an aromatics circulation pump 12 whose inlet is connected to the aromatics circulation tank 11 and whose outlet is connected to the cleaning pipe 2, and a drain pipe 13, an acid reflux pipe 14, and an alkali reflux pipe 15 connected to the reflux pipe 10. The drain pipe 13 discharges the cleaning medium from the cleaning system.

[0014] As one example, such as Figure 1 The acid supply mechanism 6 of the apparatus for cleaning a fluidized bed hydrogen peroxide filter shown includes an acid circulation tank 16 and an acid circulation pump 17 connected to the acid circulation tank 16; the alkali supply mechanism 7 includes an alkali circulation tank 18 and an alkali circulation pump 19 connected to the alkali circulation tank 18. An acid return pipe 14 returns the cleaning acid to the acid circulation tank 16, and an alkali return pipe 15 returns the cleaning alkali to the alkali circulation tank 18.

[0015] As one example, such as Figure 1 As shown, acid circulation tank 16 and alkali circulation tank 18 are the same tank body, and the tank is divided into acid side and alkali side.

[0016] The working principle and operation process are as follows: Remove the end cap of filter cleaning tank 8, place the filter element of the filter to be cleaned into filter cleaning tank 8, and after reinstalling the end cap, test the pressure to ensure there is no leakage. Turn on the aromatics circulation pump 12 to clean the filter element placed in the filter cleaning tank 8, dissolve the anthraquinone precipitated on the surface of the filter element, and the circulation filter 1 intercepts most of the solids; Open the nitrogen valve on the nitrogen supply pipe 3 to pressurize the aromatics in the filter cleaning tank 8 to the aromatics circulation tank 11; Open the pure water valve on the pure water supply pipe 4 and use pure water to clean the filter element in the filter cleaning tank 8. The cleaning waste liquid is discharged through the drain pipe 13. Open the steam valve on the steam supply pipe 5 and use steam to purge the filter element in the filter cleaning tank 8. The steam and condensate after purging are discharged through the drain pipe 13. Turn on the alkaline solution circulation pump 19, and the filter element in the filter cleaning tank 8 will be circulated for alkaline washing. The cleaning solution will be circulated back to the alkaline solution circulation tank 18. This step can clean the degradation products and catalysts attached to the surface of the filter element. After the alkaline solution is filtered by the circulation filter 1, the solids are intercepted by the circulation filter 1. Reopen the pure water valve on the pure water supply pipe 4 and use pure water to clean the filter element in the filter cleaning tank 8. The cleaning waste liquid is discharged through the drain pipe 13. Turn on the acid circulation pump 17 to circulate the filter element in the filter cleaning tank 8 for acid washing, and circulate the cleaning solution back to the acid circulation tank 16. Reopen the nitrogen valve on the nitrogen supply pipe 3 and use nitrogen to dry the filter element in the filter cleaning tank 8. The purging nitrogen is discharged through the drain pipe 13. Remove the cap of filter cleaning tank 8 and take out the cleaned filter element from filter cleaning tank 8.

[0017] Heat exchanger 9 can regulate the temperature of the cleaning medium during the cleaning process.

[0018] The technical solution provided by this utility model cleans the filter element of a fluidized bed hydrogen peroxide production filter using aromatics, pure water, steam, alkaline solution, acid solution, and nitrogen. This effectively removes impurities such as catalyst residues and degradation products adhering to the filter element surface, significantly improving the filter element's throughput performance and effectively ensuring the stability of system operation. This not only extends the filter element's service life but also provides reliable support for the continuity and efficiency of the production process. The filter element is then acid-washed after alkaline washing, eliminating the safety hazards caused by the alkaline nature of the filter element.

[0019] 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. An apparatus for cleaning a fluidized bed filter used in hydrogen peroxide production, characterized in that, It includes a circulating filter (1), a cleaning pipe (2) connected to the inlet of the circulating filter (1), a nitrogen supply pipe (3), a pure water supply pipe (4), a steam supply pipe (5), an acid supply mechanism (6) and an alkali supply mechanism (7) connected to the cleaning pipe (2), a filter cleaning tank (8) connected to the outlet of the circulating filter (1), a heat exchanger (9) whose inlet is connected to the filter cleaning tank (8), an aromatics circulating tank (11) whose reflux port is connected to the outlet of the heat exchanger (9) through a reflux pipe (10), an aromatics circulating pump (12) whose inlet is connected to the aromatics circulating tank (11) and whose outlet is connected to the cleaning pipe (2), and a drain pipe (13), an acid reflux pipe (14) and an alkali reflux pipe (15) connected to the reflux pipe (10).

2. The apparatus for cleaning a fluidized bed hydrogen peroxide production filter according to claim 1, characterized in that, The acid supply mechanism (6) includes an acid circulation tank (16) and an acid circulation pump (17) connected to the acid circulation tank (16); the alkali supply mechanism (7) includes an alkali circulation tank (18) and an alkali circulation pump (19) connected to the alkali circulation tank (18).

3. The apparatus for cleaning a fluidized bed hydrogen peroxide production filter according to claim 2, characterized in that, The acid circulation tank (16) and the alkali circulation tank (18) are the same tank body, and the tank is divided into an acid side and an alkali side.

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