Working solution treatment device in hydrogen peroxide production

Abstract

The application provides a working liquid treatment device in hydrogen peroxide production, which comprises an alkali tower, an alkali separator, a working liquid settling tank, a liquid transfer pump and a white clay bed connected in series; and the alkali tower is further connected with a concentrated alkali storage tank. The device of the application further settles the working liquid separated by the alkali separator through the working liquid settling tank to remove the mixed alkali liquid, and then transfers the settled working liquid into the white clay bed for adsorption treatment. The working liquid settling tank effectively reduces the alkali content in the working liquid, thereby reducing the influence of the catalyst activity caused by the alumina powder entering the working liquid due to the pulverization and falling of the alumina caused by the alkali liquid entering the white clay bed.

Description

Technical Field

[0001] This application relates to the field of hydrogen peroxide production technology, and in particular to a working fluid treatment device in hydrogen peroxide production. Background Technology

[0002] Hydrogen peroxide, also known as hydrogen peroxide, has the chemical formula H₂O₂, a molecular weight of 34, and a density of 1.41 g / cm³ at 25°C. 3 Hydrogen peroxide has a melting point of -89℃ and a boiling point of 151.4℃. It is a weakly acidic, colorless, odorless, and transparent liquid. It is highly reactive, a strong oxidizing agent, and corrosive. It can undergo oxidation-reduction, substitution, molecular addition, epoxidation, and decomposition reactions. It is soluble in water, alcohols, and ethers. Hydrogen peroxide's most important chemical property is its oxidizing ability. It is mainly used in the bleaching of textiles and pulp, chemical synthesis, wastewater treatment, and the electronics and aerospace industries.

[0003] Hydrogen peroxide can be synthesized using various methods, including the potassium persulfate method, oxygen cathode reduction method, isopropanol method, and anthraquinone method. The most commonly used method industrially is the anthraquinone method. In this method, ethyl anthraquinone, heavy aromatics, and trioctyl phosphate are used as raw materials to prepare a working solution with a specific composition. This solution, along with hydrogen gas, undergoes a hydrogenation reaction in a hydrogenation tower equipped with a palladium catalyst under specific temperature and pressure conditions, yielding a corresponding hydrogen anthraquinone solution (referred to as hydrogenated liquid). The hydrogenated liquid then undergoes an oxidation reaction with oxygen from the air, whereby the hydrogen anthraquinone is reverted to its original form, while hydrogen peroxide is generated. The hydrogen peroxide in the working solution is then subjected to water extraction and purification processes to obtain a qualified hydrogen peroxide product. The extracted working solution is then dried in an alkali tower, treated with a clay bed, and returned to the hydrogenation process for continued recycling. The existing working fluid treatment process involves separating the dried working fluid from the alkali tower using an alkali separator before sending it to the clay bed for treatment. However, this method of separating the alkali solution still results in some alkali solution entering the working fluid, leading to severe alkali contamination. When the alkali-laden working fluid enters the clay bed, it causes alumina to pulverize and detach. The detached alumina powder enters the catalyst bed with the working fluid, clogging the catalyst's pores and affecting its activity. Utility Model Content

[0004] This application provides a working fluid treatment device for hydrogen peroxide production, which solves the problem of severe alkali contamination in the working fluid, thereby affecting the activity of the catalyst.

[0005] This application provides a working fluid treatment device for hydrogen peroxide production, comprising an alkali tower, an alkali separator, a working fluid settling tank, a transfer pump, and a clay bed connected in series. The alkali tower is also connected to a concentrated alkali storage tank.

[0006] Optionally, the alkali tower is also connected to an alkali treatment device, which is also connected to a concentrated alkali storage tank. Both the alkali separator and the working fluid settling tank are connected to the alkali treatment device.

[0007] Optionally, a filter is also installed between the transfer pump and the clay bed.

[0008] Optionally, a coalescer is also provided between the filter and the clay bed; The coalescer is also connected to the alkali treatment unit.

[0009] Optionally, the white clay bed includes a white clay bed body, with a circulation outlet at the bottom, a circulation inlet on one side of the upper part, a working fluid inlet on one side of the lower part, and a working fluid outlet at the top of the white clay bed body. The circulating outlet is connected in sequence to the circulating pump, the circulating filter, and the circulating inlet.

[0010] Optionally, the alkali treatment device includes a dilute alkali storage tank, a preheating heat exchanger, and an evaporator and concentrator connected in series. The alkaline solution output end of the evaporator is connected to the concentrated alkali storage tank, the steam input end is connected to the steam pipeline, and the steam output end is connected to the shell-side input end of the preheating heat exchanger. The shell-side output end of the preheating heat exchanger is connected in sequence to the condenser and the condensate collection tank.

[0011] Optionally, the working fluid settling tank includes a tank body; A vertical baffle is installed inside the tank to divide the tank into an inlet area and a settling and draining area. The top of the baffle is connected to the inner top wall of the tank, and the bottom is close to the inner bottom wall of the tank. A settling grid is installed in the settling and drainage area. The settling grid includes multiple inclined and parallel grid plates, which are inclined upward from the side closer to the baffle to the side farther away from the baffle. The tank has an inlet at the top of the liquid inlet area, an outlet on one side of the upper part of the settling and draining area, and an alkali discharge outlet at the bottom.

[0012] The working fluid treatment device for hydrogen peroxide production provided in this application further settles the working fluid after separation by the alkali separator using a settling tank to remove any mixed alkali. The settled working fluid is then transferred to a clay bed for adsorption treatment. The settling tank effectively reduces the amount of alkali in the working fluid, thereby mitigating the drawback of alkali entering the clay bed and causing alumina powder to detach and enter the working fluid, which could negatively impact catalyst activity. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 A schematic diagram of a working fluid treatment device in hydrogen peroxide production provided in an embodiment of this application; Figure 2 A schematic diagram of a working fluid treatment device in hydrogen peroxide production provided in another embodiment of this application; Figure 3 A schematic diagram of a working fluid treatment device in hydrogen peroxide production provided in yet another embodiment of this application; Figure 4 This is a schematic diagram of the structure of a clay bed provided in an embodiment of this application; Figure 5 A schematic diagram of a working fluid treatment device in hydrogen peroxide production provided in yet another embodiment of this application; Figure 6 This is a schematic diagram of the structure of a working fluid settling tank provided in one embodiment of this application.

[0015] Explanation of reference numerals in the attached drawings: 1. Alkali tower; 2. Alkali separator; 3. Working fluid settling tank; 4. Clay bed; 5. Alkali treatment device; 6. Filter; 7. Coalescer; 10. Transfer pump; 20. Concentrated alkali storage tank; 30. Steam pipeline; 31. Tank body; 32. Baffle; 33. Settling grid; 40. Circulation pump; 41. Clay bed body; 42. Circulation filter; 51. Dilute alkali storage tank; 52. Preheating heat exchanger; 53. Evaporator concentrator; 54. Condenser; 55. Condensate collection tank; 301. Inlet; 302. Outlet; 303. Alkali discharge port; 331. Grid plate; 401. Circulation outlet; 402. Circulation inlet; 403. Working fluid inlet; 404. Working fluid outlet. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this application.

[0017] like Figure 1As shown, this application provides a working fluid treatment device for hydrogen peroxide production, including an alkali tower 1, an alkali separator 2, a working fluid settling tank 3, a transfer pump 10, and a clay bed 4 connected in series. Alkali tower 1 is also connected to concentrated alkali storage tank 20.

[0018] In operation, the working solution of this device first enters the alkali tower 1 and mixes with the alkali solution from the concentrated alkali storage tank 20. A neutralization reaction occurs within the alkali tower 1, removing acidic impurities and allowing the concentrated alkali solution to absorb moisture from the working solution. The resulting mixture flows into the alkali separator 2, where the working solution and alkali solution are separated. The separated working solution then enters the working solution settling tank 3, where residual alkali solution settles. The settled working solution flows out from the top. The transfer pump 10 pumps the clarified working solution from the settling tank 3 and delivers it to the bleaching bed 4. In the bleaching bed 4, the working solution flows through an activated alumina layer, where the activated alumina adsorbs residual alkali solution and a small amount of degradation products. Finally, the purified working solution is discharged from the outlet of the bleaching bed 4 and can be used in the hydrogen peroxide production cycle.

[0019] The working fluid treatment device for hydrogen peroxide production provided in this application further settles the working fluid after separation by the alkali separator 2 by setting a working fluid settling tank 3 to remove the alkali mixed in it. Then, the settled working fluid is transferred to the clay bed 4 for adsorption treatment. The setting of the working fluid settling tank 3 effectively reduces the amount of alkali in the working fluid, thereby reducing the disadvantage of alumina powder entering the working fluid due to the alkali entering the clay bed 4 and causing alumina powder to fall off, which would affect the catalyst activity.

[0020] like Figure 1 As shown, optionally, the alkali tower 1 is also connected to the alkali treatment device 5, and the alkali treatment device 5 is also connected to the concentrated alkali storage tank 20. Both the alkali separator 2 and the working fluid settling tank 3 are connected to the alkali treatment device 5.

[0021] In this application, due to the neutralization reaction and water absorption process of the concentrated alkali solution in alkali tower 1, its concentration gradually decreases, becoming a dilute alkali solution (density 1.25~1.30 g / cm³). 3 The dilute alkali solution discharged from alkali tower 1 flows into alkali treatment device 5 through pipelines. Simultaneously, the residual alkali solution separated by alkali separator 2 and the alkali solution accumulated at the bottom of working fluid settling tank 3 are also transported to alkali treatment device 5 through connecting pipelines. Inside alkali treatment device 5, these alkali solutions undergo processing steps such as concentration and purification to remove moisture and impurities. The treated concentrated alkali solution is pumped to concentrated alkali storage tank 20 (the alkali solution is a concentrated potassium carbonate solution, with a density generally around 1.4 g / cm³). 3 The concentrated alkali is stored in the left and right sides for reuse in alkali tower 1. The concentrated alkali storage tank 20 supplies alkali solution to alkali tower 1, completing the alkali solution circulation.

[0022] like Figure 1 As shown, optionally, a filter 6 is also provided between the transfer pump 10 and the clay bed 4.

[0023] In this application, a filter 6 is installed to remove fine particles or suspended solids from the working fluid before it enters the clay bed 4, preventing these impurities from clogging the clay bed 4 or reducing its adsorption efficiency. The addition of the filter 6 enhances the pretreatment capacity of the device, extends the service life of the clay bed 4, and improves the overall treatment quality. The filter 6 typically employs a cartridge, bag, or membrane filtration structure, with its pore size selected according to the size of impurities in the working fluid to ensure effective retention of particulate matter.

[0024] like Figure 2 As shown, optionally, a coalescer 7 is also provided between the filter 6 and the clay bed 4; The coalescer 7 is also connected to the alkali treatment device 5.

[0025] In this application, the coalescer 7 is a device specifically designed for separating emulsion droplets in a liquid. It typically utilizes coalescing materials to agglomerate small droplets into larger ones, which are then separated by gravity. In this application, the working fluid, after treatment in the preceding stages, may still contain a small amount of alkaline droplets. Excessive alkaline solution entering the clay bed 4 can reduce the adsorption capacity of the activated alumina or cause bed blockage.

[0026] During operation, the working fluid, after being filtered by filter 6, enters coalescer 7. Inside coalescer 7, the working fluid flows through coalescing material, and the alkaline droplets gradually increase in size and separate under the coalescence effect. The separated alkaline solution is discharged from coalescer 7 and transported through pipelines to alkaline treatment unit 5 for further processing. Simultaneously, the clarified working fluid flows out of coalescer 7 and enters bleaching bed 4. In bleaching bed 4, the working fluid passes through an activated alumina layer to adsorb residual alkaline solution and a small amount of degradation products. The finally purified working fluid is discharged from the outlet. The liquid separated from coalescer 7 is concentrated or purified in alkaline treatment unit 5, where useful components may be recovered or the solution may be safely disposed of.

[0027] like Figure 3 and Figure 4 As shown, optionally, the white clay bed 4 includes a white clay bed body 41, the bottom of the white clay bed body 41 is provided with a circulation outlet 401, the upper side is provided with a circulation inlet 402, the lower side is provided with a working fluid inlet 403, and the top of the white clay bed body 41 is provided with a working fluid outlet 404. The circulation outlet 401 is connected in sequence to the circulation pump 40, the circulation filter 42 and the circulation inlet 402.

[0028] In this application, during normal operation, the circulation pump 40 is shut down (the valve between the clay bed 4 and the circulation pump 40 is closed), and the circulation bypass is in a stopped state. At this time, the working fluid enters the lower part of the clay bed body 41 from the working fluid inlet 403, flows through the activated alumina layer for adsorption treatment, removes residual alkali and a small amount of degradation products, and the treated liquid is discharged from the working fluid outlet 404 and enters the hydrogen peroxide production section.

[0029] When the clay bed 4 is newly filled with activated alumina particles, a large amount of alumina dust will be generated due to the friction and impact of the particles during the filling process. If this dust is not treated, it will enter the subsequent hydrogen peroxide production section, which will not only block the microporous structure of the palladium catalyst in the hydrogenation tower, causing it to deactivate and affecting the output, but may also cause the large amount of hydrogen peroxide generated inside the oxidation tower (which contains a large amount of flammable and explosive aromatic solvents) to decompose, thereby causing safety accidents such as combustion and explosion. Therefore, after the new activated alumina is filled, a certain amount of working fluid is injected through the working fluid inlet 403 (this working fluid can be the working fluid from the previous stage, such as the working fluid treated by the coalescer 7, or it can be fresh working fluid; the amount of working fluid added is as needed, for example, 60% of the working fluid volume during normal operation). At this time, the working fluid outlet 404 is closed, the valve between the clay bed 4 and the circulation pump 40 is opened, and the circulation pump 40 is turned on to pump the working fluid in the clay bed 4 into the circulation filter 42 to filter out the alumina dust carried out by the working fluid. When the working fluid circulates to a certain extent (a flow meter can be installed on the corresponding pipeline to provide feedback on the number of cycles to determine whether the circulation can be terminated), the valve and the circulation pump 40 are closed to allow the normal adsorption process of the clay bed 4 to proceed (the remaining working fluid in the circulation filter 42 can be discharged to the corresponding receiving container or used for subsequent filtration).

[0030] like Figure 5 As shown, optionally, the alkali treatment device 5 includes a dilute alkali storage tank 51, a preheating heat exchanger 52, and an evaporator 53 connected in series. The alkaline solution output end of the evaporator 53 is connected to the concentrated alkali storage tank 20, the steam input end is connected to the steam pipeline 30, and the steam output end is connected to the shell-side input end of the preheating heat exchanger 52. The shell-side output end of the preheating heat exchanger 52 is connected in sequence to the condenser 54 and the condensate collection tank 55.

[0031] In this application, dilute alkali solution is pumped from dilute alkali storage tank 51 into the tube side of preheating heat exchanger 52. In preheating heat exchanger 52, the dilute alkali solution is heated by secondary steam from evaporator 53, increasing its temperature. The preheated alkali solution enters evaporator 53, where external steam is input from steam line 30 to provide a heat source, causing the water in the alkali solution to evaporate and increasing its concentration. The concentrated alkali solution is discharged from the output end of evaporator 53 and transported to concentrated alkali storage tank 20. Simultaneously, the secondary steam generated in evaporator 53 is introduced to the shell side of preheating heat exchanger 52 to preheat the dilute alkali solution. After releasing heat in the shell side of preheating heat exchanger 52, the steam becomes condensate, flows into condenser 54 for further cooling, and is finally collected in condensate collection tank 55. The entire process is continuous, achieving alkali concentration and heat recovery, reducing energy consumption and waste emissions.

[0032] like Figure 6 As shown, optionally, the working fluid settling tank 3 includes a tank body 31; A baffle 32 is vertically installed inside the tank body 31 to divide the tank body 31 into a liquid inlet area and a liquid settling and discharge area. The top of the baffle 32 is connected to the inner top wall of the tank body 31, and the bottom is close to the inner bottom wall of the tank body 31. A settling grid 33 is provided in the settling and drainage area. The settling grid 33 includes multiple inclined and parallel grid plates 331. The grid plates 331 are inclined upward from the side closer to the baffle 32 to the side farther away from the baffle 32. The tank body 31 has an inlet 301 at the top of the liquid inlet area, an outlet 302 on one side of the upper part of the settling and draining area, and an alkali discharge outlet 303 at the bottom.

[0033] In this application, during use, the working fluid enters the inlet area of ​​the working fluid settling tank 3 through the inlet 301. Guided by the baffle 32, the working fluid bypasses the bottom of the baffle 32 and flows into the settling and draining area. Within the settling and draining area, the working fluid flows through the settling grid 33. The inclined structure of the flat grid 331 causes the alkaline solution droplets (the alkaline solution is a concentrated potassium carbonate solution with a density generally around 1.4 g / cm³) to flow through the settling grid. 3 The working liquid settles to the bottom along the surface of the grid, while the clarified liquid flows upward. The clarified working liquid flows out from the outlet 302 and enters the subsequent processing unit. The settled impurities and alkali accumulate at the bottom of the tank and are periodically discharged through the alkali discharge outlet 303. The entire settling process relies on gravity. The design of the baffle 32 and the settling grid 33 extends the residence time of the working liquid, enhances the separation effect, and ensures the initial purification of the working liquid.

[0034] This application provides a working fluid treatment device for hydrogen peroxide production, the working process of which is as follows: In use, the device of this application first introduces the working liquid into the alkali tower 1, where it mixes with the alkali solution from the concentrated alkali storage tank 20. A neutralization reaction occurs within the alkali tower 1, removing acidic impurities and allowing the concentrated alkali solution to absorb moisture from the working liquid. The resulting mixture flows into the alkali separator 2, where the working liquid is separated from the alkali solution. The separated working liquid then enters the working liquid settling tank 3. In the working liquid settling tank 3, the working liquid enters the inlet area from the inlet 301. Guided by the baffle 32, the working liquid bypasses the bottom of the baffle 32 and flows into the settling and draining area. In the settling and draining area, the working liquid flows through the settling grid 33. The inclined structure of the flat grid 331 causes alkali droplets to settle to the bottom along the surface of the grid 331, while the clarified liquid flows upward. The clarified working fluid is pumped out from outlet 302 by transfer pump 10, filtered by filter 6 to remove fine particles or suspended solids, and then agglomerated and separated by coalescer 7 to remove fine alkaline droplets. The treated working fluid is then transported to clay bed 4. During normal operation, circulation pump 40 is shut down (the valve between clay bed 4 and circulation pump 40 is closed), and the circulation bypass is in a stopped state. At this time, the working fluid enters the lower part of clay bed body 41 from working fluid inlet 403, flows through the activated alumina layer for adsorption treatment to remove residual alkaline solution and a small amount of degradation products, and the treated liquid is discharged from working fluid outlet 404 and enters the hydrogen peroxide production section.

[0035] When the clay bed 4 is newly filled with activated alumina particles, a large amount of alumina dust will be generated due to the friction and impact of the particles during the filling process. If this dust is not treated, it will enter the subsequent hydrogen peroxide production section, which will not only block the microporous structure of the palladium catalyst in the hydrogenation tower, causing it to deactivate and affecting the output, but may also cause the large amount of hydrogen peroxide generated inside the oxidation tower (which contains a large amount of flammable and explosive aromatic solvents) to decompose, thereby causing safety accidents such as combustion and explosion. Therefore, after the new activated alumina is filled, a certain amount of working fluid is injected through the working fluid inlet 403 (this working fluid can be the working fluid from the previous stage, such as the working fluid treated by the coalescer 7, or it can be fresh working fluid; the amount of working fluid added is as needed, for example, 60% of the working fluid volume during normal operation). At this time, the working fluid outlet 404 is closed, the valve between the clay bed 4 and the circulation pump 40 is opened, and the circulation pump 40 is turned on to pump the working fluid in the clay bed 4 into the circulation filter 42 to filter out the alumina dust carried out by the working fluid. When the working fluid circulates to a certain extent (a flow meter can be installed on the corresponding pipeline to provide feedback on the number of cycles), the valve and the circulation pump 40 are closed to allow the normal adsorption process of the clay bed 4 to proceed (the remaining working fluid in the circulation filter 42 can be discharged to the corresponding receiving container or used for subsequent filtration).

[0036] Due to the neutralization reaction and water absorption process that occurs in alkali tower 1, the concentration of the concentrated alkali solution gradually decreases, becoming a dilute alkali solution (density 1.25~1.30 g / cm³). 3 The dilute alkali solution discharged from the alkali tower 1 flows into the alkali treatment device 5 through a pipeline. Simultaneously, the residual alkali solution separated by the alkali separator 2 and the alkali solution accumulated at the bottom of the working fluid settling tank 3 are also transported to the alkali treatment device 5 through connecting pipelines. Inside the alkali treatment device 5, the dilute alkali solution is pumped from the dilute alkali storage tank 51 into the tube side of the preheating heat exchanger 52. In the preheating heat exchanger 52, the dilute alkali solution is heated by secondary steam from the evaporator 53, increasing its temperature. The preheated alkali solution enters the evaporator 53, where external steam is input from the steam pipeline 30 to provide a heat source, causing the water in the alkali solution to evaporate and increasing its concentration. The concentrated alkali solution is discharged from the output end of the evaporator 53 and transported to the concentrated alkali storage tank 20. Simultaneously, the secondary steam generated by the evaporator 53 is introduced to the shell side of the preheating heat exchanger 52 to preheat the dilute alkali solution. After releasing heat in the shell side of the preheating heat exchanger 52, the steam becomes condensate, flows into the condenser 54 for further cooling, and is finally collected in the condensate collection tank 55.

[0037] These alkaline solutions undergo processing steps, such as concentration and purification, to remove moisture and impurities. The resulting concentrated alkaline solution (a concentrated potassium carbonate solution with a density typically around 1.4 g / cm³) is then produced. 3 The concentrated alkali is stored in the left and right sides for reuse in alkali tower 1. The concentrated alkali storage tank 20 supplies alkali solution to alkali tower 1, completing the alkali solution circulation.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A working fluid treatment device for hydrogen peroxide production, characterized in that, It includes an alkali tower (1), an alkali separator (2), a working fluid settling tank (3), a transfer pump (10), and a clay bed (4) connected in series. The alkali tower (1) is also connected to the concentrated alkali storage tank (20).

2. The working solution treatment device in hydrogen peroxide production according to claim 1, characterized by, The alkali tower (1) is also connected to the alkali treatment device (5), which is also connected to the concentrated alkali storage tank (20). The alkali separator (2) and the working fluid settling tank (3) are both connected to the alkali treatment device (5).

3. The working solution treatment device for hydrogen peroxide production according to claim 1, characterized by, A filter (6) is also provided between the transfer pump (10) and the clay bed (4).

4. The working fluid treatment device for hydrogen peroxide production according to claim 3, characterized in that, A coalescer (7) is also provided between the filter (6) and the clay bed (4); The coalescer (7) is also connected to the alkali treatment device (5).

5. The working solution treatment device for hydrogen peroxide production according to claim 1, characterized by The white clay bed (4) includes a white clay bed body (41), the bottom of the white clay bed body (41) is provided with a circulating liquid outlet (401), the upper side is provided with a circulating liquid inlet (402), the lower side is provided with a working liquid inlet (403), and the top of the white clay bed body (41) is provided with a working liquid outlet (404). The circulating outlet (401) is connected in sequence to the circulating pump (40), the circulating filter (42) and the circulating inlet (402).

6. The working solution treatment device for hydrogen peroxide production according to claim 2, characterized by The alkaline solution treatment device (5) includes a dilute alkali storage tank (51), a preheating heat exchanger (52), and an evaporator (53) connected in series. The alkaline solution output end of the evaporator (53) is connected to the concentrated alkali storage tank (20), the steam input end is connected to the steam pipeline (30), and the steam output end is connected to the shell-side input end of the preheating heat exchanger (52). The shell-side output end of the preheating heat exchanger (52) is sequentially connected to the condenser (54) and the condensate collection tank (55).

7. The working solution treatment device for hydrogen peroxide production according to claim 1, characterized by The working fluid settling tank (3) includes a tank body (31); The tank (31) is vertically equipped with a baffle (32) to divide the tank (31) into a liquid inlet area and a sedimentation and discharge area. The top of the baffle (32) is connected to the inner top wall of the tank (31), and the bottom is close to the inner bottom wall of the tank (31). A settling grid (33) is provided in the settling and drainage area. The settling grid (33) includes a plurality of inclined and parallel grid plates (331). The grid plates (331) are inclined upward from the side closer to the baffle (32) to the side farther away from the baffle (32). The tank (31) has an inlet (301) at the top of the liquid inlet area, an outlet (302) on one side of the upper part of the sedimentation and drainage area, and an alkali discharge outlet (303) at the bottom.

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