Hydrogen peroxide extraction and purification device

Abstract

The present application belongs to the technical field of extraction column, and particularly relates to a hydrogen peroxide extraction and purification device, which aims to improve the extraction efficiency and purity of hydrogen peroxide; an extraction chamber is arranged in the column body, and sieve plates, downcomers and balance plates are installed in an interlaced manner, and stirring rods, stirring paddles, impellers and other components are configured, so that anthraquinone working liquid and clear liquid are continuously and uniformly mixed, and the problem of low extraction efficiency caused by uneven mixing and unstable liquid flow speed in the prior art is solved; a liquid distribution cone cover and a liquid outlet pipe head with gradually increasing inner diameter are arranged at the inlet end of the raw liquid, so that the anthraquinone working liquid is uniformly distributed before entering the extraction chamber, and the uneven flow phenomenon is avoided; the sieve hole matrix in the sieve plate and the overflow plate structure make the anthraquinone working liquid and the clear liquid accelerate mass transfer on the sieve plate, further improve the extraction efficiency and avoid liquid accumulation and blockage; the device realizes efficient separation of light liquid and heavy liquid, thereby ensuring the purification effect of hydrogen peroxide.

Description

Technical Field

[0001] This invention belongs to the field of extraction tower technology, specifically relating to a hydrogen peroxide extraction and purification device. Background Technology

[0002] Hydrogen peroxide (H2PO4) is a commonly used chemical in chemical, pharmaceutical, and environmental protection fields, and its purity has a significant impact on the safety and reliability of subsequent processes. In existing technologies, the anthraquinone process is one of the mainstream processes for preparing hydrogen peroxide. This process typically requires sufficient contact between the anthraquinone working solution and water or other extractants to allow the hydrogen peroxide to be distributed and extracted between the two liquids. However, in actual production, due to uneven mixing, unstable liquid flow rates, and insufficient contact area, the extraction efficiency often falls short of ideal levels, leading to lower purification efficiency, higher energy consumption, and increased operational complexity of the equipment.

[0003] Traditional hydrogen peroxide extraction and purification devices often employ simple mixing tanks or multi-stage extraction towers. While these devices can perform the extraction function to some extent, the significant density difference between the anthraquinone working solution and the extraction water, coupled with the working solution's sensitivity to flow pressure and flow rate uniformity, makes it difficult for existing devices to balance efficiency and uniformity in the separation, mixing, and stirring stages.

[0004] Especially for large-scale production, the extraction process requires ensuring that the anthraquinone working solution and water are thoroughly and uniformly mixed, and that mass transfer efficiency is improved with the help of multi-layer sieves or other structures. However, without a suitable liquid separation structure, the anthraquinone working solution will exhibit uneven flow distribution in different channels, leading to a decrease in the extraction efficiency of some channels and compromising the overall extraction stability. Furthermore, if the stirring device causes excessive disturbance to the flow, or if its structure is unreasonable, turbulent dead zones may be created in certain areas, reducing the effective contact area and affecting extraction efficiency. Therefore, existing hydrogen peroxide extraction and purification devices still require improvement in areas such as stable flow separation, thorough mixing, and prevention of liquid entrainment. Summary of the Invention

[0005] In view of the problems existing in the prior art, the purpose of the present invention is to provide a hydrogen peroxide extraction and purification device that can achieve uniform separation and full contact between the anthraquinone working solution and the extraction solution in the process of large-scale production, thereby improving the extraction purity of hydrogen peroxide and the overall production efficiency.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A hydrogen peroxide extraction and purification device includes a tower body, an extraction chamber inside the tower body, sieve plates arranged alternately inside the extraction chamber, a liquid descending plate welded to the bottom side of one end of each sieve plate, and a balance plate welded to the bottom side of the other end of each sieve plate, a stirring rod passing through the balance plate and the liquid descending plate, stirring paddles evenly arranged on the outer side of the stirring rod, and an impeller for driving its own rotation nested at one end of the stirring rod; Furthermore, the sieve plate has a liquid outlet above the impeller, which is used for the heavy liquid to flow down and impact and drive the impeller to rotate. The stirring paddle is used to stir the light liquid and the heavy liquid to ensure that the heavy liquid extracts hydrogen peroxide from the clear liquid.

[0007] Furthermore, a raw liquid inlet is provided on one side of the bottom of the tower body. The raw liquid inlet extends into the interior of the tower body, and the end of the raw liquid inlet is bent vertically upward. A bracket is fixed to the end of the raw liquid inlet, and a liquid-distributing cone is fixed to the end of the bracket. The liquid-distributing cone is used to uniformly distribute the light liquid flowing out of the raw liquid inlet.

[0008] Furthermore, the upper surface of the liquid-distributing cone-shaped cover is uniformly provided with liquid outlet heads, the inner diameter of which increases sequentially from top to bottom, and the liquid outlet heads are used to uniformly distribute the light liquid flowing out of the raw liquid inlet.

[0009] Furthermore, the sieve plate has a sieve hole matrix inside, which is composed of alternating large and small holes, and an overflow plate is provided at one end of the upper surface of the sieve plate.

[0010] Furthermore, a light liquid outlet is provided at the top of the tower body, a heavy liquid inlet is provided on one side of the top of the tower body, and a heavy liquid outlet is provided on one side of the bottom of the tower body.

[0011] Compared with the prior art, the beneficial effects of the present invention are: This device, through the coordinated operation of multiple structures, ensures thorough mixing of the anthraquinone working solution and the supernatant under the combined action of continuous flow splitting and multi-stage sieve plates, thus addressing the problem of low extraction efficiency caused by uneven mixing in the prior art. Inside the tower, the extraction chamber, with its staggered sieve plates, downcomers, and balance plates, along with the stirring rod and its externally positioned impellers, allows the anthraquinone working solution and supernatant to form continuous and uniform flow and eddies within multiple layers, avoiding the dead zones and uneven liquid distribution issues common in existing technologies.

[0012] This device features a separatory cone and an outlet pipe at the inlet end of the raw solution, which diverts the incoming anthraquinone working solution into multiple channels, solving the problem of uneven flow rates in different channels in the prior art. The outlet pipe adopts a progressively increasing inner diameter design, ensuring that the anthraquinone working solution in each channel flows into the extraction chamber at approximately the same flow rate, thus achieving a stable and effective separation effect and laying the foundation for thorough mixing in the subsequent process.

[0013] This device features a corresponding outlet and impeller within the extraction chamber, allowing the downward-flowing heavy liquid to impact and drive the impeller's rotation. This, in turn, stimulates the stirring rod and paddle, effectively enhancing the contact area and time between the light and heavy liquids. Addressing the challenge of establishing continuous, high-intensity turbulence between the light and heavy liquids in previous technologies, this device utilizes a multi-stage sieve plate structure combined with the hydraulic impact at the outlet, ensuring more thorough mixing of the two phases between stages and further improving extraction efficiency.

[0014] This device, through the alternating arrangement of large and small holes in the sieve matrix, creates different flow velocities and turbulence levels for the anthraquinone working solution and the supernatant as they flow through the sieve plate, solving the problem of localized flow restriction caused by a single pore size in the prior art. The combination of the sieve and overflow plate not only allows for more flexible control of the liquid flow velocity but also prevents excessive accumulation of either the supernatant or working solution. For production processes requiring high-purity hydrogen peroxide, the design of having light liquid outlets and heavy liquid outlets at the top and bottom of the tower body respectively enables the smooth separation of the extracted anthraquinone working solution from the heavy liquid containing hydrogen peroxide during continuous operation, thus ensuring separation efficiency and the quality of the purified hydrogen peroxide. Attached Figure Description

[0015] Figure 1 This is a front view structural diagram of the present invention; Figure 2 A frontal view of the present invention, and a schematic diagram of the vertical sectional structure of the tower body; Figure 3 This is a schematic diagram of the three-dimensional structure of the sieve plate of the present invention; Figure 4 This is a front view schematic diagram of the sieve plate structure of the present invention; Figure 5 This is a three-dimensional structural diagram of the stirring rod of the present invention; Figure 6 This is a front view of the liquid-dispensing cone-shaped hood of the present invention; Figure 7 This is a top view of the liquid-dispensing cone-shaped hood structure of the present invention.

[0016] The attached diagram lists the components represented by each number as follows: 101. Tower body; 111. Extraction chamber; 102. Light liquid outlet; 103. Heavy liquid inlet; 104. Heavy liquid outlet; 105. Raw liquid inlet; 151. Support; 152. Separating cone hood; 153. Liquid outlet pipe head; 106. Sieve plate; 161. Sieve hole matrix; 162. Overflow plate; 163. Downcomer; 164. Liquid outlet; 165. Balance plate; 107. Stirring rod; 171. Impeller; 172. Stirring paddle. Detailed Implementation

[0017] To make the objectives and advantages of this invention clearer, the invention will be specifically described below with reference to embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of the invention and does not strictly limit the scope of protection specifically claimed by the invention. Example

[0018] like Figures 2-5 As shown, a hydrogen peroxide extraction and purification device includes a tower body 101, inside which is an extraction chamber 111. Inside the extraction chamber 111, sieve plates 106 are arranged in an alternating pattern. A downcomer plate 163 is welded to the bottom side of one end of each sieve plate 106, and a balance plate 165 is welded to the bottom side of the other end. A stirring rod 107 passes through the balance plate 165 and the downcomer plate 163. Stirring paddles 172 are evenly arranged on the outer side of the stirring rod 107. An impeller 171, which drives the stirring rod 107 to rotate, is nested at one end of the stirring rod 107. During operation, this hydrogen peroxide extraction and purification device extracts anthraquinone working solution... The solution is thoroughly mixed with the clarified liquid, and multiple components are combined to achieve higher extraction efficiency. In particular, the structural design of the tower body 101 and the extraction chamber 111 solves the problems of uneven mixing and low extraction efficiency in the existing technology. The sieve plates 106 are staggered and, together with the downcomer plate 163 and the balance plate 165, guide the liquid flow in layers, so that the anthraquinone working solution and the clarified liquid come into contact layer by layer. The stirring rod 107 and the stirring paddle 172 rotate under the drive of the impeller 171, so that the liquid generates eddies and forced mixing between the multi-stage sieve plates 106, thereby accelerating the distribution and mass transfer of hydrogen peroxide between the light liquid and the heavy liquid.

[0019] like Figures 2-5As shown, a liquid outlet 164 is provided above the impeller 171 on the sieve plate 106. The liquid outlet 164 is used for the heavy liquid to flow down and impact and drive the impeller 171 to rotate. The stirring paddle 172 is used to stir the light liquid and the heavy liquid to ensure that the heavy liquid extracts hydrogen peroxide from the clear liquid. The liquid outlet 164 forms a key area where the heavy liquid and the light liquid meet at the relative position of the sieve plate 106 and the impeller 171. The high-speed flow of heavy liquid impacts the impeller 171 and drives the stirring rod 107 to rotate, so that the stirring paddle 172 can efficiently stir the anthraquinone working solution and the clear liquid. This structure has optimized the separation and stirring process, effectively avoiding the stirring dead zone and uneven separation phenomenon that are easy to occur in the prior art, and further improving the mass transfer efficiency.

[0020] like Figure 2 , Figure 6 and Figure 7 As shown, a raw liquid inlet 105 is provided on one side of the bottom of the tower body 101. The raw liquid inlet 105 extends into the interior of the tower body 101, and the end of the raw liquid inlet 105 is curved vertically upward. A support 151 is fixed to the end of the raw liquid inlet 105, and a distributing cone shroud 152 is fixed to the end of the support 151. The distributing cone shroud 152 is used to uniformly distribute the light liquid flowing out of the raw liquid inlet 105. The distributing cone shroud 152 is structurally designed to provide a stable flow channel for the anthraquinone working liquid and to distribute the anthraquinone working liquid as evenly as possible after entering the interior of the tower body 101, thereby avoiding the flow imbalance problem that is prone to occur in the prior art. The distributing cone shroud 152 remains stable under the fixation of the support 151 and will not shake due to liquid impact, thereby ensuring a more stable distribution effect of the anthraquinone working liquid in the extraction chamber 111.

[0021] like Figure 2 , Figure 6 and Figure 7 As shown, the upper surface of the distributing cone shroud 152 is uniformly provided with outlet pipe heads 153. The inner diameter of the outlet pipe heads 153 increases from top to bottom. The outlet pipe heads 153 are used to uniformly distribute the light liquid flowing out of the raw liquid inlet 105. With the design of the outlet pipe heads 153 with the inner diameter increasing step by step, the flow rate of the anthraquinone working liquid in each outlet pipe head 153 is approximately the same, avoiding overload or uneven distribution in a single channel. This design improves upon the shortcomings of some distribution structures in the prior art that cannot guarantee uniform distribution of light liquid. Furthermore, the cooperation between the outlet pipe heads 153 and the distributing cone shroud 152 further enhances the control capability of the light liquid, thus laying the foundation for thorough mixing in the subsequent process.

[0022] like Figure 3As shown, the sieve plate 106 has a sieve hole matrix 161 inside, which is composed of alternating large and small holes. An overflow plate 162 is provided at one end of the upper surface of the sieve plate 106. The sieve hole matrix 161, combined with the alternating layout of large and small holes, causes the anthraquinone working liquid and the clear liquid to generate different flow velocities during the flow process, thereby forming multi-stage turbulence and eddies on the same plane. This structure, together with the overflow plate 162, enables the excess clear liquid to be automatically adjusted on the upper surface of the sieve plate 106, avoiding the local accumulation and blockage phenomenon that often occurs in the prior art, and accelerating the distribution and transfer of hydrogen peroxide between different liquid phases under the action of the layers of sieve plates 106.

[0023] like Figure 1 As shown, a light liquid outlet 102 is provided at the top of the tower body 101, and a heavy liquid inlet 103 is provided on one side of the top of the tower body 101, while a heavy liquid outlet 104 is provided on one side of the bottom of the tower body 101. The light liquid outlet 102 and the heavy liquid outlet 104 form a bidirectional flow separation structure in the upper and lower parts of the tower body 101, allowing the final extracted anthraquinone working solution and the heavy liquid to be discharged separately, thereby avoiding cross-contamination. This structure, combined with the analysis of the hydrogen peroxide extraction efficiency and purity requirements in the background technology, by setting a heavy liquid inlet 103 at the top of the tower body 101 and discharging the clear liquid from the heavy liquid outlet 104, enables the stirring process driven by the impeller 171 to achieve sufficient liquid phase contact between the multi-layer sieve plates 106, and obtains different components output at the top and bottom of the tower body 101, better meeting the needs of high-purity hydrogen peroxide extraction and production. Example

[0024] This embodiment primarily verifies the effectiveness of multiple structural components working together to improve mixing efficiency. The tower body, extraction chamber, sieve plates, downcomer, and balance plate are all made of 304 stainless steel; the stirring rod, impeller, and other components are made of 316L stainless steel and undergo corrosion-resistant treatment. Anthraquinone working solution and clear solution are introduced into the device through the light liquid inlet and heavy liquid inlet, respectively, achieving continuous mixing and diversion through the combined action of multi-stage sieve plates and the stirring device.

[0025] In the comparative experiment, a traditional extraction tower of the same size and specifications was used as the control group; the control group only had a single-layer stirring structure and no multi-stage sieve plates. The experimental conditions for both groups were the same: 1. Anthraquinone working solution injection flow rate:

[0026] 2. Clear liquid injection flow rate:

[0027] 3. Operating temperature:

[0028] 4. Operating pressure: Atmospheric pressure; 5. Stirring speed: 150 r / min.

[0029] The extraction efficiency (using hydrogen peroxide mass fraction as the evaluation index) of different experimental groups was measured after 1 hour of stable operation. The results are shown in Table 1. Group Anthraquinone working fluid flow rate (m³ / h) Clear liquid flow rate (m³ / h) Stirring speed (r / min) Extraction efficiency (%) 1 2 2 150 94.2 2 2 2 180 95.1 3 2 2 200 96.3 4 2 2 220 96.8 5 2 2 250 97.4 Group 1 was the control group (with only a single-layer stirring structure); Groups 2-5 showed the results after varying the stirring speed in the apparatus of this embodiment. As shown in Table 1, with the increase of stirring speed, the combination of the multi-stage sieve plate and the stirring structure effectively avoided liquid stratification and dead zones, resulting in an extraction efficiency increase of approximately 34 percentage points compared to the control group.

[0030] In this embodiment, to evaluate the influence of multiple structures on the mass transfer coefficient, the following formula can be used for approximate calculation:

[0031] Where K is the mass transfer coefficient; Q is the hydrogen peroxide extraction flow rate; is the hydrogen peroxide concentration after extraction; and A is the effective contact area. The concentration difference between the light and heavy liquids is represented by the concentration difference. Calculations based on experimental data show that the combination of multiple structures can increase the mass transfer coefficient by approximately 15% compared to the control group, verifying that the issue of uneven mixing leading to low extraction efficiency mentioned in the first beneficial effect has been improved in this embodiment. Example

[0032] This embodiment primarily verifies the effectiveness of the multi-channel distribution structure of the distributing conical hood and outlet pipe in uniformly distributing the anthraquinone working solution flowing out of the raw solution inlet. Both the distributing conical hood and the outlet pipe are made of 316 stainless steel and have undergone passivation treatment to enhance corrosion resistance. The inner diameter of the outlet pipe increases in a gradient from top to bottom, with five different specifications: 10 mm, 13 mm, 16 mm, 19 mm, and 22 mm.

[0033] In the comparative experiment, different shapes of liquid separators were tested under the same tower structure and stirring device conditions; the control group used a traditional simple liquid separator structure. The test conditions for both groups were the same: 1. Anthraquinone working solution injection flow rate:

[0034] 2. Clear liquid injection flow rate: 2 m³ / h; 3. Operating temperature: 30℃; 4. Operating pressure: Atmospheric pressure; 5. Stirring speed: 200 r / min.

[0035] The flow deviation coefficient of each stage of the liquid outlet pipe head was experimentally determined (defined as the mean variance of the difference between the actual flow rate and the average flow rate of each channel), and the results are shown in Table 2: Group Liquid separation structure First-stage flow rate (L / min) Second-stage flow rate (L / min) Third-stage flow rate (L / min) Fourth-level flow rate (L / min) Fifth-level flow rate (L / min) Flow deviation coefficient (×10^-3) 1 Control group (simple dispenser) 25.0 27.1 28.5 22.9 29.4 8.42 2 This device (multi-stage pipe head) 26.2 26.8 27.1 26.3 27.0 2.15 3 This device (multi-stage pipe head) 26.1 26.9 26.8 26.7 26.5 2.09 4 This device (multi-stage pipe head) 27.0 27.2 26.3 26.8 26.6 2.32 5 This device (multi-stage pipe head) 26.4 26.6 26.7 26.9 26.8 2.04 As shown in Table 2, after adopting a multi-stage inner diameter gradient separator head, the flow rate of each channel is closer to the average value, and the flow deviation coefficient is reduced. The flow rate decreased by more than 60% compared to the control group, indicating that this embodiment effectively solved the problem of balancing the flow rate of multiple channels in the background technology, and also confirmed the technical solution for stable and effective separation of the original solution described in the second paragraph of beneficial effects. Example

[0036] This embodiment primarily verifies the effectiveness of using an impeller-driven agitator at the liquid outlet and a multi-stage sieve plate structure to create high-intensity turbulence and achieve thorough mixing of light and heavy liquids. Different diameter liquid outlets (20 mm, 25 mm, 30 mm, 35 mm, and 40 mm) were installed in the column. The impeller adopted a four-bladed swept-back design, and the stirring rod speed was adjustable between 100 and 300 r / min. The experimental setup was compared with a control setup under the same extraction chamber dimensions: the control setup had a constant liquid outlet diameter of 20 mm, and the relative position of the impeller and the liquid outlet was not adjustable. The experimental conditions for both sets were unified as follows: 1. Anthraquinone working solution injection flow rate:

[0037] 2. Clear liquid injection flow rate:

[0038] 3. Operating temperature:

[0039] 4. Operating pressure: Atmospheric pressure; 5. Stirring speed: 200 r / min.

[0040] The difference in hydrogen peroxide concentration gradient between the light and heavy liquids was measured separately after two hours of continuous operation (expressed as C). (diff) is used to reflect the degree of mass transfer adequacy; data are shown in Table 3. Group Outlet diameter (mm) Impeller diameter (mm) Hydrogen peroxide concentration gradient difference C_ diff(%) 1 20 100 1.50 2 25 100 1.20 3 30 120 0.95 4 35 120 0.82 5 40 120 0.70 Group 1 is the control device; Groups 2-5 are the test results of this device under different outlet diameters and impeller combinations. C The closer the diff value is to 0, the more consistent the hydrogen peroxide concentration is between the light and heavy liquids, indicating more thorough mixing. As shown in Table 3, with the improvement of the matching degree between the outlet and the impeller diameter, the multi-stage sieve plate combined with the hydraulic impact stirring mode can increase the concentration of hydrogen peroxide (C)... The diff gradually decreased from 1.50% to 0.70%, indicating that this embodiment can effectively enhance the formation of high-intensity turbulence and improve extraction efficiency, which confirms the improvements in continuous turbulence and thorough mixing mentioned in the third beneficial effect. Example

[0041] This embodiment primarily verifies the influence of the staggered arrangement of large and small holes in the sieve matrix on fluid velocity and turbulence levels, and achieves high-purity hydrogen peroxide extraction under a top-bottom separation mode with light and heavy liquid outlets. The sieve plate is configured with staggered large holes (8mm diameter) and small holes (3mm diameter); the overflow plate extends 40mm along one end of the sieve plate; a light liquid outlet is located at the top of the tower, and a heavy liquid outlet is located at the bottom, to achieve continuous separation of light and heavy liquids.

[0042] The control group used a single-aperture sieve plate (5mm aperture), with all other conditions identical to the apparatus. The experimental conditions for both groups were the same: 1. Anthraquinone working solution injection flow rate:

[0043] 2. Clear liquid injection flow rate:

[0044] 3. Operating temperature:

[0045] 4. Operating pressure: Atmospheric pressure; 5. Stirring speed: 180 r / min.

[0046] After running for 3 hours, the residual hydrogen peroxide content in the anthraquinone working solution collected at the light liquid outlet and the hydrogen peroxide purity (by mass fraction) in the hydrogen peroxide-containing solution collected at the heavy liquid outlet were measured. The results are shown in Table 4. Group Sieve plate aperture type Hydrogen peroxide residue (%) hydrogen peroxide purity (%) 1 Single aperture (5 mm) 4.5 33.2 2 Large hole 8mm + small hole 3mm 3.2 35.1 3 Large hole 8 mm + small hole 3 mm 2.9 35.4 4 Large hole 8 mm + small hole 3 mm 2.7 36.0 5 Large hole 8 mm + small hole 3 mm 2.6 36.3 Group 1 served as the control group; Groups 2-5 presented test results using different arrangements of large and small pores (such as spacing and staggered ratios) in this embodiment. The results showed that the staggered sieve matrix not only reduced the residual hydrogen peroxide in the anthraquinone working solution (by approximately 1.9 percentage points compared to the control group) but also improved the hydrogen peroxide purity (up to 36.3%). The differentiated sieve sizes created different levels of turbulence during flow, and the overflow plate prevented liquid accumulation on the sieve surface, further promoting the balanced distribution of hydrogen peroxide between the light and heavy liquid phases. The upper and lower outlets of the column allowed for rapid separation of the heavy and light liquids, ensuring the final purity and recovery rate of the hydrogen peroxide, thus verifying the improvements described in the fourth section regarding localized flow restriction and improved separation quality associated with single-pore sizes.

[0047] The comparative study of the four embodiments above demonstrates that this device has substantial improvements in multi-stage structure, liquid separation device, hydraulic impact stirring, and staggered sieve aperture. The experimental data obtained from each embodiment also fully illustrate the superiority of this technical solution in improving extraction efficiency, uniformly distributing flow rate, enhancing turbulent mixing, and increasing hydrogen peroxide purity. The specific embodiments described above do not limit the application scope and function of this device. Any conventional adjustments to the structure and process made based on these embodiments are within the protection scope of this device.

[0048] The working principle of this invention is as follows: First, pure water is piped into the heavy liquid inlet 103, and anthraquinone working solution is piped into the raw liquid inlet 105. The flow rate of pure water is adjusted so that the pure water level covers the overflow plate 162 and the stirring rod 107, ensuring that the stirring rod 107 can mix the pure water and the anthraquinone working solution when stirring. Anthraquinone working solution flows out from the end of the raw solution inlet 105. Due to the low density of the anthraquinone working solution, it enters the interior of the distributing cone shroud 152 and then flows out evenly through the outlet pipe head 153. The inner diameter of the outlet pipe head 153 increases from top to bottom, and the pressure on the anthraquinone working solution decreases accordingly. Therefore, the flow rate of the anthraquinone working solution flowing out of each outlet pipe head 153 is approximately the same, thus achieving uniform distribution of the anthraquinone working solution. The anthraquinone working solution flows out uniformly and comes into full contact with water, then flows to the bottom side of the lowest sieve plate 106 and flows out from inside the sieve hole matrix 161 of the sieve plate 106. The sieve hole matrix 161 is composed of alternating large and small holes, which makes the outflow speed of the anthraquinone working solution different, thus driving the overall mixing and flow of the liquid to make full contact. Pure water flows out from outlet 164, impacting and driving impeller 171 to rotate. Impeller 171 drives stirring rod 171 and stirring paddle 172 to rotate. Stirring paddle 172 further stirs and mixes pure water and anthraquinone working solution to achieve full contact. Pure water extracts hydrogen peroxide from anthraquinone working solution and finally flows out from heavy liquid outlet 104. The extracted anthraquinone working solution flows out from light liquid outlet 102.

[0049] The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained in this invention are implemented according to conventional methods in the art unless otherwise specified or limited.

Claims

1. A hydrogen peroxide extraction and purification apparatus, comprising a tower body (101), wherein an extraction chamber (111) is disposed inside the tower body (101), and sieve plates (106) are alternately installed inside the extraction chamber (111), characterized in that: A liquid descending plate (163) is welded to the bottom side of one end of the sieve plate (106), and a balance plate (165) is welded to the bottom side of the other end of the sieve plate (106). A stirring rod (107) passes through between the balance plate (165) and the liquid descending plate (163). Stirring paddles (172) are evenly arranged on the outer side of the stirring rod (107). An impeller (171) that drives the stirring rod (107) to rotate is nested at one end of the stirring rod (107). The sieve plate (106) is provided with a liquid outlet (164) above the impeller (171). The liquid outlet (164) is used for the heavy liquid to flow down and impact to drive the impeller (171) to rotate. The stirring paddle (172) is used to stir the light liquid and the heavy liquid to make full contact, so as to ensure that the heavy liquid extracts hydrogen peroxide from the clear liquid.

2. The hydrogen peroxide extraction and purification apparatus according to claim 1, characterized in that: A raw liquid inlet (105) is provided on one side of the bottom of the tower body (101). The raw liquid inlet (105) extends into the interior of the tower body (101), and the end of the raw liquid inlet (105) is bent vertically upward. A bracket (151) is fixed to the end of the raw liquid inlet (105), and a liquid-distributing cone hood (152) is fixed to the end of the bracket (151). The liquid-distributing cone hood (152) is used to uniformly distribute the light liquid flowing out of the raw liquid inlet (105).

3. The hydrogen peroxide extraction and purification apparatus according to claim 2, characterized in that: The upper surface of the liquid-distributing cone-shaped cover (152) is uniformly provided with liquid outlet heads (153), and the inner diameter of the liquid outlet heads (153) increases from top to bottom. The liquid outlet heads (153) are used to uniformly distribute the light liquid flowing out of the raw liquid inlet (105).

4. The hydrogen peroxide extraction and purification apparatus according to claim 1, characterized in that: The sieve plate (106) has a sieve hole matrix (161) inside, which is composed of alternating large holes and small holes, and an overflow plate (162) is provided at one end of the upper surface of the sieve plate (106).

5. The hydrogen peroxide extraction and purification apparatus according to claim 1, characterized in that: The top of the tower body (101) is provided with a light liquid outlet (102), and a heavy liquid inlet (103) is provided on one side of the top of the tower body (101), and a heavy liquid outlet (104) is provided on one side of the bottom of the tower body (101).

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