Working solution washing system for hydrogen peroxide production

Abstract

The utility model provides a working solution washing system for hydrogen peroxide production. The working solution washing system comprises an extraction tower, an alkali washing device, a water washing device and an acidification kettle which are sequentially connected in series, the washing device is also connected with an alkali liquor tank; the acidification kettle is also connected with a phosphoric acid storage tank. According to the system, the alkali washing device is arranged to conduct alkali washing regeneration on extracted working liquid, meanwhile, the water washing device and the acidification kettle are arranged to conduct water washing and acidification on the working liquid obtained after alkali washing, and therefore the stability of hydrogen peroxide in the working liquid is improved; the defect that the quality of a hydrogen peroxide product is reduced due to the fact that degradation products are accumulated in the working solution and normal proceeding of the technological process is affected is overcome.

Description

Technical Field

[0001] The present application relates to the technical field of hydrogen peroxide production, and in particular to a working fluid washing system for hydrogen peroxide production. Background Art

[0002] Hydrogen peroxide, the common name for a colorless, odorless, transparent aqueous solution of hydrogen peroxide, is a strong oxidant and disinfectant widely used in sterilization, sewage treatment, dyeing and weaving, bleaching, and other fields. Currently, industrial production methods for hydrogen peroxide include the anthraquinone method, electrolysis, isopropyl alcohol oxidation, oxygen cathode electrolytic reduction, and direct hydrogen-oxygen synthesis. The anthraquinone method, due to its relatively mature process, has become the most predominant method for producing hydrogen peroxide. This method offers advantages such as a high degree of automation, low power consumption, no consumption of other scarce resources (only oxygen, hydrogen, and water), and high unit production capacity. The process involves a Pd catalyst at a temperature of 55°C to 65°C and a pressure of 0.3 MPa. The active anthraquinone in the working solution reacts with hydrogen to form the corresponding hydroanthraquinone. The hydroanthraquinone then reacts with oxygen to produce the corresponding anthraquinone and hydrogen peroxide.

[0003] The anthraquinone process for producing hydrogen peroxide shows that alkylanthraquinones serve solely as working carriers during the reaction, and other than mechanical losses, no other losses should occur. However, due to the complexity of organic reactions and the selectivity of catalysts, side reactions inevitably occur during the hydrogenation and oxidation processes, producing anthraquinone derivatives. These byproducts are effectively incapable of producing hydrogen peroxide and are collectively referred to as degradation products. The formation of degradation products is slow, but once formed, they lose their ability to produce hydrogen peroxide, resulting in a decrease in the effective anthraquinone content (alkylanthraquinones and tetrahydroalkylanthraquinones) in the working solution. This alters the working solution's physical properties, reduces the water production rate, impacts the process, and reduces the quality of the hydrogen peroxide product.

[0004] Therefore, it is necessary to regenerate the working fluid before use to avoid the accumulation of degradation products in the working fluid, which may affect the normal progress of the process and lead to adverse consequences such as deterioration of the quality of hydrogen peroxide products. Utility Model Content

[0005] The present application provides a working fluid washing system for hydrogen peroxide production, which is used to solve the problem of accumulation of degradation products in the working fluid, which affects the normal progress of the process and leads to a decrease in the quality of the hydrogen peroxide product.

[0006] The present application provides a working liquid washing system for hydrogen peroxide production, comprising an extraction tower, an alkali washing device, a water washing device and an acidification kettle connected in series;

[0007] The alkali washing device includes at least one alkali washer, which is divided into an alkali washing tank and a separation tank by a partition, and the alkali washing tank and the separation tank are connected by an overflow port opened on the upper part of the partition;

[0008] An oil phase outlet is provided at the top of the separation tank, and a water phase outlet is provided at the bottom;

[0009] The alkali washing tank is connected to the extraction tower and the alkali liquid tank respectively, and the oil phase outlet is connected to the water washing device;

[0010] The water washing device is also connected to the alkali solution tank;

[0011] The acidification kettle is also connected to the phosphoric acid storage tank.

[0012] Optionally, the alkali cleaning device includes multiple stages of alkali cleaners connected in series;

[0013] The alkali washing tank in the first stage alkali washing device is connected to the extraction tower, and the oil phase outlet of the separation tank in the last stage alkali washing device is connected to the water washing device;

[0014] The oil phase outlet of the upper separation tank is connected to the alkali washing tank in the lower alkali washing device; the water phase outlet of the lower separation tank is connected to the upper alkali washing tank;

[0015] The alkali washing tank in the last stage alkali washer is connected to the alkali liquid tank.

[0016] Optionally, the water washing device includes a water washing kettle and a clean water storage tank connected to the water washing kettle;

[0017] The water washing kettle is also connected to the emulsion collection tank.

[0018] Optionally, the extraction tower is further connected to an alkali treatment tower, an alkali separator, a mixer and a dehydration tower in sequence;

[0019] The mixer is also connected to the acidification kettle.

[0020] Optionally, the dehydration tower is also connected to the clay bed and the working fluid circulation tank in sequence.

[0021] Optionally, the clay bed includes a condensation tower, a packing tower and a distillation kettle which are sequentially connected from top to bottom;

[0022] The packed tower and the distillation kettle are connected by a connecting pipe.

[0023] Optionally, a feed port is provided on the upper side of the packed tower, and a discharge port is provided on the lower side;

[0024] One end of the connecting pipe is connected to the distillation kettle, and the other end is closed and extends into the packed tower and is close to the top of the packed tower; a plurality of through holes are opened on the upper part of the closed end of the connecting pipe;

[0025] The packed tower is also connected to the distillation kettle through a siphon tube. One end of the siphon tube is connected to the distillation kettle, and the other end extends into the packed tower and is close to the inner bottom of the packed tower. A valve is provided on the siphon tube.

[0026] The present application provides a working liquid washing system for hydrogen peroxide production. The system comprises an alkali washing device for alkali-washing and regenerating the extracted working liquid. A water washing device and an acidification kettle are also provided for washing and acidifying the working liquid after alkali washing, thereby improving the stability of the hydrogen peroxide in the working liquid. The system of the present application washes and regenerates the working liquid for hydrogen peroxide production by using the above-mentioned devices in combination, thereby overcoming the problem that degradation products accumulate in the working liquid, thereby affecting the normal progress of the process and causing a decrease in the quality of the hydrogen peroxide product. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0028] Figure 1 A schematic diagram of a working liquid washing system for hydrogen peroxide production provided in one embodiment of the present application;

[0029] Figure 2 A schematic structural diagram of an alkali washing device provided in one embodiment of the present application;

[0030] Figure 3 A schematic structural diagram of an alkali washing device provided in another embodiment of the present application;

[0031] Figure 4 A schematic structural diagram of a water washing device provided in one embodiment of the present application;

[0032] Figure 5 A schematic diagram of a working fluid washing system for hydrogen peroxide production provided in another embodiment of the present application;

[0033] Figure 6 This is a schematic structural diagram of a clay bed provided in one embodiment of the present application.

[0034] Description of reference numerals:

[0035] 1. Extraction tower; 2. Alkali washing device; 3. Water washing device; 4. Acidification kettle; 5. Alkali treatment tower; 6. Alkali separator; 7. Mixer; 8. Dehydration tower; 9. White clay bed; 10. Working fluid circulation tank; 21. Alkali washing device; 22. Alkali liquid tank; 31. Water washing kettle; 32. Clean water storage tank; 33. Emulsion collection tank; 41. Phosphoric acid storage tank; 91. Condensation tower; 92. Packing tower; 93. Distillation kettle; 94. Connecting pipe; 100. Valve; 201. Overflow port; 211. Partition; 212. Alkali washing tank; 213. Separation tank; 901. Feed inlet; 902. Discharge port; 921. Siphon; 2101. Oil phase outlet; 2102. Water phase outlet. DETAILED DESCRIPTION

[0036] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application are clearly and completely described below. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts also fall within the scope of protection of this application.

[0037] like Figure 1 and Figure 2 As shown, the present application provides a working liquid washing system for hydrogen peroxide production, comprising an extraction tower 1, an alkaline washing device 2, a water washing device 3 and an acidification kettle 4 connected in series;

[0038] The alkali washing device 2 includes at least one alkali washer 21, which is divided into an alkali washing tank 212 and a separation tank 213 by a partition 211. The alkali washing tank 212 and the separation tank 213 are connected by an overflow port 201 opened on the upper part of the partition 211;

[0039] The upper portion of the separation tank 213 is provided with an oil phase outlet 2101, and the bottom portion is provided with a water phase outlet 2102;

[0040] The alkali washing tank 212 is connected to the extraction tower 1 and the alkali liquid tank 22 respectively, and the oil phase outlet 2101 is connected to the water washing device 3;

[0041] The water washing device 3 is also connected to the alkali liquid tank 22;

[0042] The acidification kettle 4 is also connected to a phosphoric acid storage tank 41 .

[0043] During use, the hydrogen peroxide synthesis liquid is extracted and enriched with water in the extraction tower 1 , and then the working liquid is transported from the extraction tower 1 to the alkali washing device 2 .

[0044] The working fluid entering the alkali cleaning device 2 is first input into the alkali cleaning tank 212 of the alkali cleaning device 21 and mixed with the alkali solution (a sodium hydroxide aqueous solution with a concentration of about 15% in the present application) supplied by the alkali solution tank 22 (a heating device can also be set in the alkali cleaning tank 212 to heat the mixed solution to a suitable temperature such as 45 to 55° C.). During the alkali cleaning regeneration process, the alkali solution and the partial degradation products in the working fluid contact and react to regenerate the degradation products. The working fluid after the alkali cleaning overflows into the separation tank 213 through the overflow port 201 on the dividing plate 211 and is allowed to stand for stratification. The upper layer is the working fluid after the oil phase, i.e., the primary alkali cleaning, and the lower layer is the aqueous phase, i.e., the alkali solution. The aqueous phase after the stratification in the separation tank 213 is output to the corresponding alkali solution receiving device through the aqueous phase outlet 2102 at the separation tank 213 bottom, and the oil phase is output to the water washing device 3 from the oil phase outlet 2101 at the separation tank 213 top for washing.

[0045] The working liquid after washing is then added to the acidification kettle 4 and mixed with the dilute phosphoric acid supplied from the phosphoric acid storage tank 41 for acidification. Since hydrogen peroxide can exist stably under acidic conditions, the decomposition of hydrogen peroxide can be reduced, thus avoiding safety accidents.

[0046] The present application provides a working liquid washing system for hydrogen peroxide production. The system comprises an alkali washing device 2 for alkali-washing and regenerating the extracted working liquid. A water washing device 3 and an acidification kettle 4 are simultaneously provided for washing and acidifying the working liquid after alkali washing, thereby improving the stability of hydrogen peroxide in the working liquid. The system of the present application washes and regenerates the working liquid for hydrogen peroxide production by using the above-mentioned devices in combination, thereby overcoming the disadvantage that degradation products accumulate in the working liquid, thereby affecting the normal progress of the process and causing a decrease in the quality of the hydrogen peroxide product.

[0047] like Figure 3 As shown, optionally, the alkali cleaning device 2 includes multiple stages of alkali cleaning devices 21 connected in series;

[0048] The alkali washing tank 212 in the first-stage alkali washing device 21 is connected to the extraction tower 1, and the oil phase outlet 2101 of the separation tank 213 in the last-stage alkali washing device 21 is connected to the water washing device 3;

[0049] The oil phase outlet 2101 of the upper separation tank 213 is connected to the alkali washing tank 212 in the lower alkali washer 21; the water phase outlet 2102 of the lower separation tank 213 is connected to the upper alkali washing tank 212;

[0050] The alkali washing tank 212 in the last-stage alkali washer 21 is connected to the alkali liquid tank 22 .

[0051] In the present application, when in use, the working fluid entering the alkali washing device 2 is first input into the alkali washing tank 212 of the first-stage alkali washer 21, and the aqueous phase in the separation tank 213 of the next-stage alkali washer 21 is also input into the alkali washing tank 212 of the first-stage alkali washer 21; and the alkali liquid tank 22 inputs the alkali liquid (a sodium hydroxide aqueous solution with a concentration of about 15% in the present application) into the alkali washing tank 212 of the last-stage alkali washer 21, and is mixed and washed with the oil phase output from the separation tank 213 of the previous-stage alkali washer 21 in the alkali washing tank 212. Alkali lye and working fluid mix and stir in alkali wash tank 212 (heating device can also be set in alkali wash tank 212, mixed liquor is heated to suitable temperature such as 45~55 ℃), alkali lye and the partial degradation product contact reaction in working fluid, make degradation product regeneration, working fluid after alkali wash overflows in separation tank 213 by overflow port 201 on dividing plate 211, standing for stratification, upper strata is oil phase also the working fluid after primary alkali wash, and lower floor is water also alkali lye. Water after separation tank 213 stratification is then exported in upper level alkali wash tank 212 (if first step alkali scrubber then the alkali lye of export is discharged in corresponding alkali lye receiving device) by the water phase outlet 2102 at separation tank 213 bottom, and oil phase then is exported in next level alkali wash tank 212 from the oil phase outlet 2101 at separation tank 213 top (if last stage alkali scrubber then the oil phase of export is exported in water washing device 3).

[0052] like Figure 4 As shown, optionally, the water washing device 3 includes a water washing tank 31 and a clean water storage tank 32 connected to the water washing tank 31;

[0053] The water washing kettle 31 is also connected to the emulsion collecting tank 33 .

[0054] In the present application, the working liquid after alkali washing and regeneration enters the water washing kettle 31, and is stirred and washed with the clean water input from the clean water storage tank 32. The clean water is used to wash and remove the residual alkali solution in the working liquid. The clean water and the working liquid are mixed and washed and then allowed to stand. The upper layer is the oil phase, that is, the cleaned working liquid, and the lower layer is the water phase. The upper oil phase is transferred to the acidification kettle 4, and the lower water phase is transferred to the alkali liquid tank 22 for the preparation of alkali liquid. Since the working liquid is washed with water after alkali washing, an emulsion layer will be generated at the oil-water interface during the water washing process. During the working process, the liquid of this part of the emulsion layer can be transferred to the emulsion collection tank 33 for treatment (for example, adding acid to break the emulsion and stratify it).

[0055] like Figure 5 As shown, optionally, the extraction tower 1 is further connected to the alkali treatment tower 5, the alkali separator 6, the mixer 7 and the dehydration tower 8 in sequence;

[0056] The mixer 7 is also connected to the acidification kettle 4.

[0057] In this application, the working liquid output from the extraction tower 1 enters the alkali treatment tower 5, where it reacts with the alkali therein, namely sodium carbonate. The sodium carbonate reacts with the residual hydrogen peroxide in the working liquid to remove the hydrogen peroxide. The alkali-treated working liquid is then input into the alkali separator 6 to separate the alkali entrained in the working liquid by sedimentation. The separated working liquid is then input into the mixer 7, where it is mixed and neutralized with the acidified working liquid from the acidification kettle 4, thereby adjusting the working liquid to a weakly acidic or neutral state. The mixed working liquid is dried and dehydrated in the dehydration tower 8 and then transferred to subsequent equipment for further processing. Dividing the working liquid into two parts and treating them separately can reduce the processing pressure of the alkali washing device 2. In addition, the acidified working liquid and the working liquid treated in the alkali treatment tower 5 and the alkali separator 6 are mixed in the mixer 7, which can neutralize the acidified working liquid and the alkaline working liquid treated in the alkali treatment tower 5 and the alkali separator 6, thereby avoiding the adverse consequences of aluminum oxide powdering in the subsequent clay bed due to excessive alkalinity or acidity of the working liquid.

[0058] like Figure 5 As shown, optionally, the dehydration tower 8 is also connected to the clay bed 9 and the working fluid circulation tank 10 in sequence.

[0059] In the present application, the dehydrated working fluid enters the clay bed 9 for regeneration, and the regenerated working fluid is discharged into the working fluid circulation tank 10 for recycling.

[0060] like Figure 6 As shown, optionally, the clay bed 9 includes a condensation tower 91, a packing tower 92 and a distillation kettle 93 which are sequentially connected from top to bottom;

[0061] The packed tower 92 and the distillation pot 93 are connected via a connecting pipe 94 .

[0062] In the present application, the packed tower 92 is filled with activated alumina for regenerating the working fluid.

[0063] like Figure 6 As shown, optionally, a feed port 901 is provided on the upper side of the packed tower 92, and a discharge port 902 is provided on the lower side;

[0064] One end of the connecting pipe 94 is connected to the distillation kettle 93, and the other end is closed and extends into the packed tower 92, close to the top of the packed tower 92; a plurality of through holes are opened on the upper portion of the closed end of the connecting pipe 94;

[0065] The packed tower 92 is also connected to the distillation kettle 93 through a siphon tube 921. One end of the siphon tube 921 is connected to the distillation kettle 93, and the other end extends into the packed tower 92 and is close to the inner bottom of the packed tower 92. A valve 100 is provided on the siphon tube.

[0066] In the present application, during operation, the clay bed 9 introduces dried working fluid from the feed port 901 into the packing tower 92, with the valve 100 closed. The working fluid flows from the top of the packing down through the packing layer (activated alumina), and the degradation products in the working fluid are regenerated by the alumina. The regenerated working fluid is then discharged from the discharge port 902 into the working fluid circulation tank 10 for recycling.

[0067] After the filler in the clay bed 9 has been used for a period of time, the degradation products in the working fluid will clog the micropores of the alumina, causing the regeneration activity of the regeneration working fluid to decrease. At this time, the alumina filler in the packing tower 92 is regenerated.

[0068] During regeneration, the feed port 901 and the discharge port 902 are closed, the valve 100 is opened to connect the siphon tube 921, and the washing liquid in the distillation kettle 93 (aromatic hydrocarbons such as toluene, xylene, etc. in this application) is heated. After the washing liquid is heated, it evaporates and is discharged from the through-hole at the upper part of the connecting pipe 94, and then flows upward into the condensation tower 91 to condense into droplets and fall into the packing tower 92, where the packing is soaked and washed, and the degradation products attached to the packing are dissolved. When the liquid level in the packing tower 92 is higher than the highest point of the siphon tube 921, due to the siphon effect, all the liquid in the packing tower 92 flows into the distillation kettle 93 through the siphon tube for the next round of washing. After the washing is completed, the clay bed 9 can be used for the regeneration of the working fluid.

[0069] A working liquid washing system for hydrogen peroxide production, the working process of which is as follows:

[0070] During use, the hydrogen peroxide synthesis liquid is extracted and enriched with water in the extraction tower 1, and then the working liquid is transported from the extraction tower 1 to the alkali treatment tower 5 and the alkali washing device 2 respectively.

[0071] The working fluid entering the alkali washing device 2 is first input into the alkali washing tank 212 of the first-stage alkali washer 21, and the water phase in the separation tank 213 of the next-stage alkali washer 21 is also input into the alkali washing tank 212 of the first-stage alkali washer 21; and the alkali liquid tank 22 inputs the alkali liquid (in this application, a sodium hydroxide aqueous solution with a concentration of about 15%) into the alkali washing tank 212 of the last-stage alkali washer 21, and is mixed and washed with the oil phase output from the separation tank 213 of the previous-stage alkali washer 21 in the alkali washing tank 212. Alkali liquor and working fluid mix and stir in alkali washing tank 212 (heating device can also be set in alkali washing tank 212, mixed liquor is heated to suitable temperature such as 45~55 ℃), alkali liquor and the partial degradation product contact reaction in working fluid make degradation product regeneration, working fluid after alkali liquor washing overflows in separation tank 213 by overflow port 201 on dividing plate 211, standing for stratification, upper strata is oil phase also the working fluid after primary alkali washing, and lower floor is aqueous phase also alkali liquor. Aqueous phase after separation tank 213 stratification then is exported to upper level alkali washing tank 212 (if first step alkali scrubber then the alkali liquor of export is discharged in corresponding alkali liquor receiving device) by the aqueous phase outlet 2102 at separation tank 213 bottom, and oil phase then is exported to next level alkali washing tank 212 from the oil phase outlet 2101 at separation tank 213 top (if last step alkali scrubber then the oil phase of export is exported to washing kettle 31). The alkali solution and the working liquid are counter-currently washed in the multi-stage alkali washer 21, and the working liquid after alkali washing and regeneration is input into the water washing kettle 31 for water washing.

[0072] The working fluid after alkali washing regeneration enters the washing kettle 31, is stirred and washed with the clear water of the clear water storage tank 32 input, and the alkali lye washing residual in the working fluid is removed by clear water. The clear water and the working fluid are mixed and washed and then left to stand. The upper strata is the oil phase, i.e. the working fluid after cleaning, and the lower strata is the aqueous phase. The oil phase on the upper strata is transferred to the acidifying kettle 4, and the aqueous phase on the lower strata is transferred to the alkali lye tank 22 for preparing alkali lye. Since the working fluid is washed again after alkali washing, an emulsion layer is generated at the oil-water interface during the washing process. In the course of work, the liquid of this part of the emulsion layer can be transferred to the emulsion collecting tank 33 for processing (such as adding acid to break the emulsion and stratify it). The working fluid after the washing is then added to the acidifying kettle 4 and acidified with the dilute phosphoric acid supplied by the phosphoric acid storage tank 41. Because hydrogen peroxide can stably exist under acidic conditions, the decomposition of hydrogen peroxide can be reduced, avoiding safety accidents.

[0073] The working liquid discharged from extraction tower 1 enters alkali treatment tower 5, where it reacts with the alkali present, sodium carbonate, removing the residual hydrogen peroxide from the working liquid. The alkali-treated working liquid is then fed into alkali separator 6, where the alkali is separated by sedimentation. The separated working liquid is then fed into mixer 7, where it is mixed with the acidified working liquid from acidification reactor 4 to neutralize the solution, rendering it weakly acidic or neutral. The mixed working liquid is then dried and dehydrated in dehydration tower 8 before being transferred to clay bed 9 for further regeneration.

[0074] During operation, the clay bed 9 introduces dried working fluid from the feed port 901 into the packing tower 92, with valve 100 closed. The working fluid flows downward from the top of the packing layer (activated alumina), where degradation products in the working fluid are regenerated by the alumina. The regenerated working fluid is then discharged from the discharge port 902 into the working fluid circulation tank 10 for recycling.

[0075] After the filler in the clay bed 9 has been used for a period of time, the degradation products in the working fluid will clog the micropores of the alumina, causing the regeneration activity of the regeneration working fluid to decrease. At this time, the alumina filler in the packing tower 92 is regenerated.

[0076] During regeneration, the feed port 901 and the discharge port 902 are closed, the valve 100 is opened to connect the siphon tube 921, and the washing liquid in the distillation kettle 93 is heated (in this application, it is aromatic hydrocarbons such as toluene, xylene or a solvent with the same total aromatic hydrocarbons as the working liquid, etc.). After the washing liquid is heated, it evaporates and is discharged from the through-hole at the upper part of the connecting pipe 94, and then flows upward into the condensation tower 91 to condense into droplets and fall into the packing tower 92, where the packing is soaked and washed, and the degradation products attached to the packing are dissolved. When the liquid level in the packing tower 92 is higher than the highest point of the siphon tube 921, due to the siphon effect, all the liquid in the packing tower 92 flows into the distillation kettle 93 through the siphon tube for the next round of washing. After the washing is completed, the clay bed 9 can be used for the regeneration of the working liquid.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A working liquid washing system for hydrogen peroxide production, characterized in that: It comprises an extraction tower (1), an alkali washing device (2), a water washing device (3) and an acidification kettle (4) which are connected in series in sequence; The alkali washing device (2) comprises at least one alkali washer (21), the alkali washer (21) being divided into an alkali washing tank (212) and a separation tank (213) by a partition (211), and the alkali washing tank (212) and the separation tank (213) being connected by an overflow port (201) opened on the upper part of the partition (211); The separation tank (213) is provided with an oil phase outlet (2101) at the top and a water phase outlet (2102) at the bottom; The alkali washing tank (212) is connected to the extraction tower (1) and the alkali liquid tank (22) respectively, and the oil phase outlet (2101) is connected to the water washing device (3); The water washing device (3) is also connected to the alkali liquid tank (22); The acidification kettle (4) is also connected to a phosphoric acid storage tank (41).

2. The working liquid washing system for hydrogen peroxide production according to claim 1, characterized in that: The alkali washing device (2) comprises multiple stages of alkali washers (21) connected in series; The alkali washing tank (212) in the first-stage alkali washing device (21) is connected to the extraction tower (1), and the oil phase outlet (2101) of the separation tank (213) in the last-stage alkali washing device (21) is connected to the water washing device (3); The oil phase outlet (2101) of the separation tank (213) of the previous stage is connected to the alkali washing tank (212) in the alkali washer (21) of the next stage; the water phase outlet (2102) of the separation tank (213) of the next stage is connected to the alkali washing tank (212) of the previous stage; The alkali washing tank (212) in the last stage alkali washer (21) is connected to the alkali liquid tank (22).

3. The working liquid washing system for hydrogen peroxide production according to claim 1, characterized in that: The water washing device (3) comprises a water washing kettle (31) and a clean water storage tank (32) connected to the water washing kettle (31); The water washing kettle (31) is also connected to the emulsion collecting tank (33).

4. The working liquid washing system for hydrogen peroxide production according to any one of claims 1 to 3, characterized in that: The extraction tower (1) is also connected to the alkali treatment tower (5), the alkali separator (6), the mixer (7) and the dehydration tower (8) in sequence; The mixer (7) is also connected to the acidification kettle (4).

5. The working liquid washing system for hydrogen peroxide production according to claim 4, characterized in that: The dehydration tower (8) is also connected to the clay bed (9) and the working fluid circulation tank (10) in sequence.

6. The working liquid washing system for hydrogen peroxide production according to claim 5, characterized in that: The clay bed (9) comprises a condensation tower (91), a packing tower (92) and a distillation kettle (93) which are sequentially connected from top to bottom; The packed tower (92) and the distillation kettle (93) are connected via a connecting pipe (94).

7. The working liquid washing system for hydrogen peroxide production according to claim 6, characterized in that: The packing tower (92) is provided with a feed inlet (901) on the upper side and a discharge outlet (902) on the lower side; One end of the connecting pipe (94) is connected to the distillation kettle (93), and the other end is closed and extends into the packed tower (92) and is close to the top of the packed tower (92); a plurality of through holes are opened on the upper part of the closed end of the connecting pipe (94); The packed tower (92) is also connected to the distillation kettle (93) through a siphon tube (921). One end of the siphon tube (921) is connected to the distillation kettle (93), and the other end extends into the packed tower (92) and is close to the inner bottom of the packed tower (92). A valve (100) is provided on the siphon tube (921).

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