Alkali-free regeneration system and process for working fluid in hydrogen peroxide production using anthraquinone method

Abstract

The present invention relates to an alkali-free regeneration system and process for an anthraquinone method hydrogen peroxide production working fluid, and belongs to the technical field of an alkali-free regeneration system for an anthraquinone method hydrogen peroxide production working fluid. The alkali-free regeneration system for an anthraquinone method hydrogen peroxide production working fluid provided by the present invention comprises a raw liquid kettle, a filter press, an upper cleaning component, a lower cleaning component, and a flushing component. The upper cleaning component comprises an annular scraper that can move from top to bottom to scrape off attachments on the inner wall of a cylindrical segment; the lower cleaning component comprises a strip scraper that can scrape off attachments on the inner wall of a spherical segment when rotating; the flushing component is mounted on the upper cleaning component and can spray cleaning liquid toward the inner wall of the spherical segment when the upper cleaning component moves to the bottom of the cylindrical segment, so as to flush and clean the inner wall of the spherical segment and the lower cleaning component. The present invention can realize the automated cleaning of the raw liquid kettle, improve the cleaning efficiency, enhance the cleaning effect, and make the cleaning process safer.

Description

Technical Field

[0001] The invention relates to the technical field of alkali-free regeneration systems for working fluids in hydrogen peroxide production, and in particular to an alkali-free regeneration system and process for working fluids in hydrogen peroxide production using an anthraquinone process. Background Art

[0002] The anthraquinone process is the mainstream technology for industrial hydrogen peroxide production, accounting for over 95% of global production. Its core principle is to indirectly synthesize hydrogen peroxide from hydrogen and oxygen through a cyclic redox reaction of anthraquinone derivatives. During the anthraquinone process, the working fluid generates viscous degradation products due to side reactions. These degradation products increase the solution's viscosity and, under certain conditions, can form precipitates, clogging valves and pipes and reducing hydrogenation efficiency. Regeneration of the working fluid is a crucial core process, designed to remove degradation products accumulated during the working fluid's circulation process and restore its chemical composition and physical properties, thereby maintaining long-term stability and high efficiency throughout the production process.

[0003] Traditional regeneration relies on alkali treatment, which often leads to problems such as waste alkali contamination and equipment corrosion. The alkali-free regeneration system replaces traditional alkali washing with physical adsorption, catalytic conversion, and water washing technologies, achieving efficient and environmentally friendly regeneration.

[0004] For example, the hydrogen peroxide working solution purification and washing process disclosed in the patent application document with application publication number CN119409142A is an alkali-free regeneration process. The process includes the following steps: S1. Constructing a hydrogen peroxide working solution purification and washing system; S2. Injecting the working solution into a stock liquid kettle in the hydrogen peroxide working solution purification and washing system for reaction, followed by solid-liquid separation; S3. Dissolving the product obtained after the solid-liquid separation; S4. After the dissolution treatment is completed, washing with water, and when precipitates appear in the liquid, performing a secondary separation, and temporarily storing the resulting separated liquid; S5. Using a white clay bed in the hydrogen peroxide working solution purification and washing system to separate residual substances, and recombine the effective component substances, and finally regenerating and temporarily storing the finished product.

[0005] In step S2 of this process, it is necessary to inject the working liquid into the original liquid kettle for reaction, and then perform solid-liquid separation. Specifically, during the reaction process, the working liquid is heated to 73°C and allowed to stand for 4 hours. After the liquid and solid are separated into upper and lower layers, the liquid in the upper layer of the original liquid kettle is discharged, and the solid-liquid mixture in the lower layer is discharged into a filter press for solid-liquid separation again. After the substances in the original liquid kettle are discharged, some reactants will still adhere to the inner side wall of the original liquid kettle, and since the solids settle to the bottom of the original liquid kettle after the reaction liquid is allowed to stand, the adhesion of the reactants to the bottom side wall of the original liquid kettle is more serious. Before the original liquid kettle is put into use for the next time, the inner side wall of the original liquid kettle needs to be cleaned. In the prior art, a manual high-pressure water gun is used to clean it, but manual operation is labor-intensive and inefficient. If the harmful substances remaining in the original liquid kettle leak, it will also lead to safety accidents. Summary of the Invention

[0006] The present invention provides an alkali-free regeneration system for working fluid in hydrogen peroxide production by an anthraquinone process, so as to solve the technical problems in the prior art of low cleaning efficiency and high safety risks of the stock liquid kettle used in the alkali-free regeneration system for working fluid in hydrogen peroxide production when cleaning is performed by manually operating a high-pressure water gun.

[0007] The present invention also provides an alkali-free regeneration process for the working solution of hydrogen peroxide production by the anthraquinone method, which can make the alkali-free regeneration process of the hydrogen peroxide working solution proceed more safely and smoothly.

[0008] To solve the above problems, the present invention provides an alkali-free regeneration system for working fluid in the production of hydrogen peroxide using the anthraquinone process, which adopts the following technical solutions:

[0009] The alkali-free regeneration system for working fluid in the production of hydrogen peroxide by the anthraquinone process includes:

[0010] The original liquid kettle comprises a cylindrical section and a spherical section connected to the bottom of the cylindrical section, and a discharge port is provided at the bottom of the spherical section;

[0011] The filter press is located next to the stock liquid kettle and has a feed port connected to the discharge port;

[0012] Also includes:

[0013] The upper cleaning assembly includes an annular scraper movably installed in the raw liquid kettle, the annular scraper is adapted to the inner cavity of the cylindrical section and can move from top to bottom to scrape off attachments on the inner wall of the cylindrical section;

[0014] The lower cleaning assembly includes a strip scraper rotatably mounted in the spherical segment, the strip scraper being in contact with the inner wall of the spherical segment and capable of scraping off attachments on the inner wall of the spherical segment during rotation;

[0015] The flushing assembly is installed on the upper cleaning assembly and has a storage chamber for storing cleaning liquid. When the upper cleaning assembly moves to the bottom of the cylindrical section, it can spray cleaning liquid toward the inner wall of the spherical section to flush and clean the inner wall of the spherical section and the lower cleaning assembly.

[0016] With the above technical solution, after the reactants in the stock liquid kettle are discharged, the upper cleaning assembly is driven downward, and the annular scraper scrapes off the attachments on the inner wall of the cylindrical section. At the same time, the strip scraper is driven to rotate to scrape off the attachments on the inner wall of the spherical section. When the upper cleaning assembly moves to the bottom of the cylindrical section, the flushing assembly sprays cleaning liquid toward the inner wall of the spherical section to flush and clean the attachments scraped off the inner wall of the spherical section, thereby achieving automated cleaning of the inner wall of the stock liquid kettle. Compared with manual operation, the cleaning efficiency is higher, the cleaning effect is better, and the cleaning process is safer. The flushing assembly is installed on the upper cleaning assembly. During the reaction of the reactants in the stock liquid kettle, the flushing assembly can move together with the upper cleaning assembly to above the liquid level in the stock liquid kettle, preventing solid matter generated by the reaction from adhering to the upper cleaning assembly and the flushing assembly, making it difficult to clean.

[0017] Furthermore, the flushing assembly includes an internal hollow annular shell connected to the inner side of the annular scraper, and a plurality of liquid storage tanks are arranged at intervals along the circumference of the annular shell and with openings facing upwards are provided in the annular shell. The inner cavities of the plurality of liquid storage tanks form the storage chamber, and the interval between any two adjacent liquid storage tanks forms a drainage channel. A interval is provided between the top of the liquid storage tank and the top inner side wall of the annular shell to connect the liquid storage tank with the drainage channel. A liquid pushing part is elastically and slidably installed in the liquid storage tank, and the liquid pushing part is stopped up and down by the lower cleaning assembly so that it is pushed by the lower cleaning assembly and moves upward relative to the annular shell during the downward movement of the flushing assembly, thereby pushing the cleaning liquid in the liquid storage chamber to be flushed to the inner side wall of the spherical segment through the drainage channel.

[0018] Using the above technical solution, the flushing assembly includes an annular housing, which is provided with multiple circumferentially spaced liquid storage tanks and multiple circumferentially spaced liquid drainage channels. When the flushing assembly moves to the bottom of the cylindrical section, the liquid pusher contacts the lower cleaning assembly and is pushed upward by the lower cleaning assembly, pushing the cleaning liquid in the liquid storage tanks through the drainage channels. The pushed cleaning liquid is then flushed onto the inner sidewall of the spherical section and the lower cleaning assembly. The liquid is discharged through the cooperation of the liquid pusher and the lower cleaning assembly, eliminating the need for a separate drive structure for discharging the cleaning liquid. This makes the structure simple and ingenious, saving power costs.

[0019] Furthermore, a plurality of through holes are provided on the top wall of the annular shell, and each liquid storage tank has corresponding through holes above it.

[0020] With the above technical solution, a through hole is provided on the annular shell, which allows the air pressure in the liquid storage tank to be balanced with the external air pressure. After the solid-liquid separation of the reactants in the raw liquid kettle, the upper cleaning component and the flushing component can be driven downward, so that the flushing component is immersed in the upper layer of liquid after stratification. Since the through hole is provided at the top of the annular shell, during this process, the upper layer of liquid in the raw liquid kettle can enter the liquid storage tank through the drainage channel and the gap between the liquid storage tank and the top inner wall of the annular shell. The upper layer of liquid after stratification is stored in the liquid storage tank as cleaning liquid, and then used to flush and clean the spherical segment and the lower cleaning component. The liquid containing solid attachments after flushing can directly enter the filter press through the discharge port for solid-liquid separation, and the separated liquid can be collected and reused. The solid attachments can be collected and processed in a centralized manner. Compared with the introduction of new cleaning liquid, the clean liquid mixed with solid attachments after flushing does not need to be discharged separately for treatment.

[0021] Furthermore, a sealing rod that can elastically move up and down is connected to the liquid pushing part, and the bottom end of the sealing rod protrudes downward from the liquid pushing part. The sealing rod is opposite to the through hole up and down. When the liquid pushing part moves downward with the flushing component, the sealing rod contacts the lower cleaning component and is pushed upward relative to the annular shell to seal the through hole.

[0022] By adopting the above technical solution, when the flushing assembly moves downward to the bottom of the cylindrical section, the blocking rod first contacts the lower cleaning assembly and is pushed upward, thereby blocking the through hole and preventing the cleaning liquid from flowing out of the through hole when the subsequent liquid pushing part moves upward.

[0023] Furthermore, the liquid pushing part includes a liquid pushing plate and a column connected to the bottom of the liquid pushing plate. The liquid pushing plate slides up and down and is inserted into the liquid storage tank. The column can be pushed by the lower cleaning component and move upward relative to the annular shell, thereby driving the liquid pushing plate to move upward relative to the annular shell.

[0024] Furthermore, the interior of the column is hollow, and the top end is connected to the inner cavity of the liquid storage tank. A liquid outlet is provided on the bottom side wall of the column. The sealing rod is coaxial with the column and slides up and down in the column. The sealing rod is provided with upper and lower hollow sealing blocks, which slide up and down and are inserted into the inner cavity of the column. The sealing block can block the liquid outlet and open the liquid outlet as the sealing rod moves upward relative to the annular shell when the sealing rod is pushed by the lower cleaning assembly.

[0025] By adopting the above technical solution, the interior of the column is hollow and connected to the liquid storage tank, and the liquid outlet at the bottom of the column is opened when the sealing rod is pushed by the lower cleaning component. When the liquid pushing part moves upward, the cleaning liquid will also be sprayed out from the liquid outlet, thereby enhancing the flushing and cleaning effect.

[0026] Furthermore, the bottom end of the annular scraper protrudes downward from the annular housing, and the column can be moved until the liquid outlet is flush with the bottom area of ​​the annular scraper when pushed by the lower cleaning assembly.

[0027] By adopting the above technical solution, the liquid outlet can be moved to be flush with the bottom end of the annular slide, and the cleaning liquid sprayed from the liquid outlet can be sprayed to the bottom end of the annular scraper, flushing the bottom end of the annular scraper, further enhancing the cleaning effect.

[0028] Furthermore, the lower cleaning assembly includes a connecting ring rotatably installed in the raw liquid kettle and a strip scraper connected to the bottom of the connecting ring. The positions of each column and the connecting ring correspond to each other up and down, and can be pushed upward by the connecting ring. The extension path of the strip scraper is a spiral curve, and the rotation direction of the strip scraper enables it to apply a downward thrust to the attachments on the inner wall of the spherical segment when it rotates.

[0029] By adopting the above technical solution, when the strip scraper rotates, it can exert a downward thrust on the attachments on the inner wall of the spherical segment, so that the scraped attachments can move downward and be discharged from the raw liquid kettle.

[0030] Furthermore, a driving mechanism is installed on the raw liquid kettle, which includes a driving motor and a transmission screw. The transmission screw is rotatably installed in the raw liquid kettle, and the transmission screw is connected to the driving motor so as to be driven by the driven motor to rotate. The annular shell is spirally connected to the transmission screw, and the annular scraper is installed in the raw liquid kettle for upward and downward guiding sliding. When the transmission screw rotates, it can drive the annular scraper to move up and down. The connecting ring is fixedly connected to the transmission screw and can be driven to rotate by the transmission screw.

[0031] The alkali-free regeneration system for working fluid in anthraquinone-based hydrogen peroxide production provided by the present invention has the beneficial effects of enabling automated cleaning of the stock solution kettle, improving cleaning efficiency and enhancing cleaning effectiveness, making the cleaning process safer and preventing harmful substances from causing harm to the human body. The scraped deposits are flushed using the upper layer of liquid after stratification, without introducing new liquid. The waste liquid containing solid deposits produced after flushing can be directly discharged into a filter press for separation, thus avoiding waste and allowing the solid deposits to be centrally collected and processed.

[0032] The present invention also provides an alkali-free regeneration process for anthraquinone method hydrogen peroxide production working fluid, which is implemented using the above-mentioned alkali-free regeneration system for anthraquinone method hydrogen peroxide production working fluid. The process comprises the following steps:

[0033] S1. Inject the working solution into the original liquid kettle for reaction, and then let it stand for treatment;

[0034] S2. After the working liquid is separated into upper and lower layers in the original liquid kettle, the solid-liquid mixture in the lower layer is discharged from the discharge port, and the discharged solid-liquid mixture is injected into the filter press from the feed port for solid-liquid separation;

[0035] S3, discharge the remaining upper liquid in the raw liquid pump;

[0036] S4, driving the upper cleaning assembly to move downward, the annular scraper to move downward to scrape off the attachments on the inner wall of the cylindrical segment, driving the lower cleaning assembly to rotate, the strip scraper to rotate to scrape off the attachments on the inner wall of the spherical segment;

[0037] S5. The upper cleaning component continues to move to the bottom of the cylindrical section, and the flushing component sprays cleaning liquid to flush and clean the inner wall of the spherical section and the lower cleaning component.

[0038] The alkali-free regeneration process for the anthraquinone method hydrogen peroxide production working solution provided by the present invention has the beneficial effects of enabling the stock liquid kettle used in the reaction process to be cleaned faster and better, making the entire process safer and smoother during continuous production, and increasing production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A front view of the alkali-free regeneration system for working fluid in the production of hydrogen peroxide using the anthraquinone method provided by the present invention;

[0040] Figure 2 A planar cross-sectional view of a stock solution kettle in an alkali-free regeneration system for working solution in anthraquinone-based hydrogen peroxide production provided by the present invention;

[0041] Figure 3 for Figure 2 A schematic diagram of the structure at point A in the middle;

[0042] Figure 4 A planar cross-sectional view from a top view of a stock liquid kettle in an alkali-free regeneration system for working liquid for hydrogen peroxide production using anthraquinone method provided by the present invention;

[0043] Figure 5 for Figure 4 A magnified schematic diagram of the structure at B in the middle;

[0044] Figure 6 This is a cross-sectional view of the annular shell of the alkali-free regeneration system for the production of hydrogen peroxide using the anthraquinone method provided by the present invention, cut through the drainage channel;

[0045] Figure 7 The present invention provides a three-dimensional cross-sectional view of a stock liquid kettle in an alkali-free regeneration system for working liquid in anthraquinone method hydrogen peroxide production.

[0046] Description of reference numerals:

[0047] 1. Driving motor; 2. Raw liquid kettle; 201. Discharge port; 202. Cylindrical section; 203. Spherical section; 204. Guide groove; 3. Filter press; 301. Feed port; 4. Transmission screw; 5. Connecting ring; 6. Strip scraper; 7. Ring scraper; 8. Ring shell; 801. Through hole; 802. Perforation; 9. Column; 901. Liquid outlet; 10. Connecting plate; 11. Sealing rod; 12. Sealing block; 13. Liquid push plate; 14. Elastic member; 15. Liquid storage tank; 16. Partition; 17. Guide block; 18. Discharge channel; 19. Center ring; 20. Support rod. DETAILED DESCRIPTION

[0048] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0049] The following is one embodiment of the alkali-free regeneration system for the anthraquinone method hydrogen peroxide production working fluid provided by the present invention:

[0050] like Figure 1-Figure 7 As shown, the alkali-free regeneration system for the working liquid of the anthraquinone method hydrogen peroxide production includes a raw liquid kettle 2, a filter press 3, an upper cleaning component, a flushing component, a lower cleaning component and a driving mechanism.

[0051] like Figure 1 、 Figure 2 As shown, the raw liquid kettle 2 includes a cylindrical section 202 and a spherical end connected to the bottom of the cylindrical section 202, as shown in FIG. Figure 7 As shown, two guide grooves 204 arranged opposite to each other and extending vertically are provided on the inner side wall of the cylindrical section 202 , and a discharge port 201 is provided at the bottom end of the spherical section 203 .

[0052] The filter press 3 is located beside the raw liquid kettle 2 . The filter press 3 has a feed port 301 . The feed port 301 of the filter press 3 is connected to the discharge port 201 at the bottom end of the spherical segment 203 .

[0053] like Figure 2 、 Figure 3 、 Figure 7As shown, the upper cleaning assembly includes an annular scraper 7 and two guide blocks 17. The outer diameter of the annular scraper 7 matches the inner diameter of the cylindrical section 202, allowing the outer wall of the annular scraper 7 to abut against the inner wall of the cylindrical section 202. The two guide blocks 17 are connected to the outer wall of the annular scraper 7 and maintain relative positioning. The two guide blocks 17 are respectively inserted into two guide grooves 204 in the cylindrical section 202, thereby preventing the annular scraper 7 from rotating relative to the raw liquid kettle 2 and allowing the annular scraper 7 to slide up and down within the raw liquid kettle 2.

[0054] like Figure 2 、 Figure 3 、 Figure 7 As shown, the flushing assembly includes an annular shell 8, a liquid pushing member, a blocking rod 11 and a connecting member.

[0055] The annular shell 8 is coaxially arranged on the inner side of the annular scraper 7 and is connected to the annular scraper 7 as a whole. The annular scraper 7 serves as the outer side wall of the annular shell 8. The cross section of the annular shell 8 is square.

[0056] like Figure 3 、 Figure 4 As shown, the annular shell 8 is provided with a plurality of baffle groups evenly arranged along the circumference of the annular shell 8, and each baffle group includes two baffles 16 spaced apart along the circumference of the annular shell 8, as shown in FIG. Figure 5 As shown, a gap is provided between the partition plate 16 and the top inner wall of the annular housing 8 , and two partition plates 16 in the partition plate group enclose a liquid storage tank 15 with an upward opening in the inner cavity of the annular housing 8 .

[0057] The space between each pair of adjacent liquid reservoirs 15, that is, the space between each pair of adjacent partition plates, forms a drainage channel 18. This channel 18 connects to the inner cavity of the liquid reservoir 15 through the space between the partition plates 16 and the top inner wall of the annular housing 8. The multiple liquid reservoirs 15 collectively form a storage cavity within the annular housing 8. The bottom wall of the annular housing 8 includes multiple vertical through-holes 802, corresponding to each liquid reservoir 15. These through-holes 802 are smaller than the horizontal cross-sectional dimensions of the liquid reservoir 15 and serve to reduce the weight of the annular housing 8.

[0058] like Figure 3 As shown, the top side wall of the annular shell 8 is provided with a plurality of circular through holes 801 evenly arranged along the circumference of the annular shell 8, and each liquid storage tank 15 has two through holes 801 spaced apart along the circumference of the annular shell 8. Figure 3 、 Figure 6 、 Figure 7 As shown, the bottom end of the annular scraper 7 protrudes downward from the bottom surface of the annular shell 8.

[0059] There are multiple pushers, one for each liquid reservoir 15, and the pushers include a pusher plate 13 and two columns 9. The shape of the pusher plate 13 is consistent with the horizontal cross-sectional shape of the liquid reservoir 15. The pusher plate 13 is inserted into the liquid reservoir 15 so as to slide up and down. The outer circumference of the pusher plate 13 matches the inner circumference of the liquid reservoir 15, that is, the outer wall of the pusher plate 13 is tightly against the inner wall of the liquid reservoir 15.

[0060] Two cylinders 9 are connected to the bottom of the liquid pusher plate 13 and are spaced apart along the circumference of the annular housing 8. The cylinders 9 are hollow, with an open top and a closed bottom. The top of the cylinders 9 communicates with the liquid reservoir 15, and an arc-shaped liquid outlet 901 is provided on the bottom sidewall of the cylinder 9, facing the inner sidewall of the cylindrical section 202.

[0061] There are multiple blocking rods 11, and each column 9 is coaxially penetrated by a blocking rod 11 that can move up and down. The above-mentioned through holes 801 are coaxial with each blocking rod 11, and the inner diameter of each through hole 801 matches the outer diameter of each blocking rod 11.

[0062] The bottom end of the blocking rod 11 extends downward to the bottom of the column 9. A blocking block 12 is connected to the bottom of the blocking rod 11. The blocking block 12 is hollowed out above and below. The blocking block 12 slides up and down in the column 9. Its outer wall fits with the inner wall of the column 9. When the blocking block 12 is located at the bottom of the inner cavity of the column 9, it can block the liquid outlet 901.

[0063] An elastic member 14 is connected between the blocking block 12 and the top side wall of the annular shell 8. The elastic member 14 is sleeved on the outside of the blocking rod 11. The elastic member 14 applies a downward elastic force to the blocking block 12, so that the blocking block 12 remains at the bottom of the inner cavity of the column 9 when not affected by external force, so that the blocking block 12 can block the liquid outlet 901.

[0064] like Figure 7 As shown, the connecting member is connected to the inside of the annular housing 8 and includes three connecting plates 10 evenly arranged in the circumferential direction of the annular housing 8 and a center ring 19 connected between the three connecting plates 10 .

[0065] like Figure 2 、 Figure 7 As shown, the lower cleaning assembly includes a connecting ring 5 and a plurality of strip-shaped scrapers 6. The connecting ring 5 is located at the bottom of the cylindrical section 202. The aforementioned blocking rods 11 and the cylinders 9 are vertically opposed to the connecting ring 5. The outer diameter of the connecting ring 5 is smaller than the outer diameter of the cylindrical section 202, so that a gap is formed between the connecting ring 5 and the cylindrical section 202 for the bottom ends of the annular scrapers 7 to be inserted.

[0066] Multiple strip scrapers 6 are connected to the bottom of the connecting ring 5 and are evenly distributed around the circumference of the connecting ring 5. The extension path of the strip scrapers 6 is a spiral curve. Each strip scraper 6 fits against the inner wall of the spherical segment 203. The rotation direction of the strip scraper 6 enables it to apply a downward thrust to the attachments on the inner wall of the spherical segment 203 when it rotates.

[0067] The driving mechanism includes a driving motor 1 and a transmission screw 4. Figure 1 As shown, the driving motor 1 is installed at the top of the stock liquid kettle 2, and the transmission screw 4 is coaxial with the stock liquid kettle 2 and is rotatably installed in the stock liquid kettle 2, as shown in FIG. Figure 7 As shown, the center ring 19 is sleeved on the outside of the transmission screw 4 and is in spiral transmission cooperation with the transmission screw 4 , and the connecting ring 5 is relatively fixedly connected to the bottom end of the transmission screw 4 through a plurality of support rods 20 .

[0068] The alkali-free regeneration system for anthraquinone-based hydrogen peroxide production working fluid provided by the present invention can more efficiently clean the stock liquid kettle 2, achieving better cleaning results and a safer cleaning process. The present invention can directly utilize the upper layer of liquid after stratification within the stock liquid kettle 2 to flush scraped attachments, eliminating the need to introduce new cleaning liquid, thereby saving resources.

[0069] In this embodiment, the upper cleaning component includes an annular scraper 7, and the flushing component includes an annular shell 8, a liquid pushing part, a sealing rod 11 and a connecting part. In other embodiments, the flushing component includes multiple nozzles, and the multiple nozzles are installed on the inner side of the annular scraper 7. The end of the nozzle is connected to a liquid infusion pipe, and the liquid infusion pipe penetrates into the raw liquid kettle 2 through the inlet of the raw liquid kettle 2. After the annular scraper 7 moves to the bottom of the cylindrical section 202, each nozzle also moves to the bottom of the cylindrical section 202, and each nozzle sprays a cleaning liquid to flush the upper cleaning component, the lower cleaning component and the inner wall of the spherical section 203. The cleaning liquid sprayed by the nozzle can be pure water.

[0070] In this embodiment, the annular shell 8 and the annular scraper 7 are an integrated structure, and the annular scraper 7 serves as an outer wall of the annular shell 8. In other embodiments, the annular scraper 7 and the annular shell 8 are independent of each other, and the cross-section of the annular shell 8 is square and is connected to the inner wall of the annular scraper 7 by welding or other means.

[0071] In this embodiment, a plurality of through-holes 802 are provided on the bottom wall of the annular housing 8 . In other embodiments, no through-holes 802 are provided on the bottom wall of the annular housing 8 . In this case, the annular housing 8 is heavier.

[0072] In this embodiment, the upper cleaning component includes an annular scraper 7, the outer wall of the annular scraper 7 is in contact with the inner wall of the cylindrical segment 202, so as to scrape off the attachments on the side wall of the cylindrical segment 202 when the annular scraper 7 moves downward. In other embodiments, the upper cleaning component includes a horizontal circular plate, the outer periphery of the horizontal circular plate is in contact with the inner wall of the cylindrical segment 202, so as to scrape off the attachments on the cylindrical segment 202 during the downward movement.

[0073] In this embodiment, the extension path of the strip scraper 6 is a spiral curve, so that when the strip scraper 6 rotates, it can apply a downward thrust to the attachments scraped off the inner wall of the spherical segment 203, so as to facilitate better downward discharge of the attachments. In other embodiments, the extension path of the strip scraper 6 is an arc curve that fits the inner wall of the spherical segment 203. At this time, when the strip scraper 6 rotates, it cannot apply a downward thrust to the attachments scraped off, and it is necessary to rely on the flushing of the cleaning liquid to discharge the attachments scraped off.

[0074] The present invention also provides an alkali-free regeneration process for working solution in the production of hydrogen peroxide by anthraquinone method, the process comprising the following steps:

[0075] S1, injecting the working solution into the original liquid kettle 2 for reaction, and then allowing it to stand for treatment;

[0076] S2. After the working liquid is separated into upper and lower layers in the original liquid kettle 2, the solid-liquid mixture in the lower layer is discharged from the discharge port, and the discharged solid-liquid mixture is injected into the filter press 3 from the feed port 301 for solid-liquid separation;

[0077] S3. Start the drive motor 1, driving the transmission screw 4 to rotate a set number of times and then stop. The transmission screw 4 drives the upper cleaning assembly and the flushing assembly to move downward a distance, so that the annular housing 8 is immersed in the liquid in the upper layer remaining in the stock liquid kettle 2. The liquid in the stock liquid kettle 2 flows into the liquid storage tank 15 through the drainage channel 18 and fills the liquid storage tank 15. That is, the liquid in the upper layer of the stock liquid kettle 2 is used as the cleaning liquid and stored in each liquid storage tank 15.

[0078] S4. Use the pump group to extract the remaining upper liquid in the raw liquid pump;

[0079] S5. Start the drive motor 1 again to rotate the transmission screw 4. The transmission screw 4 drives the upper cleaning assembly and the flushing assembly to move downward, and at the same time drives the lower cleaning assembly to rotate. The annular scraper 7 moves downward to scrape off the attachments on the inner wall of the cylindrical segment 202. The strip scraper 6 rotates to scrape off the attachments on the inner wall of the spherical segment 203.

[0080] S6. The upper cleaning assembly continues to move downward to the bottom of the cylindrical section 202. The bottom end of the blocking rod 11 first contacts the connecting ring 5 and is pushed upward relative to the annular housing 8 by the connecting ring 5, thereby blocking the through hole 801. At the same time, the blocking rod 11 also drives the blocking block 12 to move upward relative to the annular housing 8. The blocking block 12 moves to above the liquid outlet 901, thereby opening the liquid outlet 901.

[0081] S7. The upper cleaning assembly continues to move downward. The column 9 contacts the connecting ring 5 and is pushed upward relative to the annular housing 8 by the connecting ring 5. The liquid pusher plate 13 pushes the cleaning liquid in the liquid reservoir 15 upward. Part of the cleaning liquid in the liquid reservoir 15 flows through the gap between the partition 16 and the top inner wall of the annular housing 8 to the drainage channel 18 and is discharged. Part of the cleaning liquid is discharged from the liquid outlet 901. The cleaning liquid is flushed onto the inner wall of the spherical segment 203, cleaning the inner wall of the spherical segment 203 and the lower cleaning assembly.

[0082] S8. The annular housing 8 continues to move downward. When the bottom end of the annular scraper 7 is inserted into the space between the connecting ring 5 and the cylindrical section 202, the liquid outlet 901 is opposite to the bottom area of ​​the annular scraper 7. The cleaning liquid discharged from the liquid outlet 901 is discharged to the bottom of the annular scraper 7, flushing and cleaning the bottom of the annular scraper 7.

[0083] S9. After the cleaning liquid has flushed all parts of the structure, it is mixed with the flushed attachments and discharged into the filter press 3 for solid-liquid separation.

[0084] The above-mentioned anthraquinone method hydrogen peroxide production working fluid alkali-free regeneration process is adopted to realize the alkali-free regeneration of hydrogen peroxide, which makes the entire process safer and smoother and the production efficiency higher during the continuous production process.

Claims

1. Alkali-free regeneration system for working fluid in anthraquinone-based hydrogen peroxide production, including: The original liquid kettle comprises a cylindrical section and a spherical section connected to the bottom of the cylindrical section, and a discharge port is provided at the bottom of the spherical section; The filter press is located next to the stock liquid kettle and has a feed port connected to the discharge port; It is characterized by further comprising: The upper cleaning assembly includes an annular scraper movably installed in the raw liquid kettle, the annular scraper is adapted to the inner cavity of the cylindrical section and can move from top to bottom to scrape off attachments on the inner wall of the cylindrical section; The lower cleaning assembly includes a strip scraper rotatably mounted in the spherical segment, the strip scraper being in contact with the inner wall of the spherical segment and capable of scraping off attachments on the inner wall of the spherical segment during rotation; The flushing assembly includes an internal hollow annular shell connected to the inner side of the annular scraper, and the annular shell is provided with a plurality of liquid storage tanks arranged at intervals along the circumference of the annular shell and with openings facing upward. The inner cavities of the plurality of liquid storage tanks form a storage chamber, and can spray cleaning liquid toward the inner wall of the spherical section when the upper cleaning assembly moves to the bottom of the cylindrical section to flush and clean the inner wall of the spherical section and the lower cleaning assembly; the interval between any two adjacent liquid storage tanks forms a drainage channel, and a interval is provided between the top of the liquid storage tank and the inner wall of the top of the annular shell to connect the liquid storage tank and the drainage channel, and the liquid in the original liquid kettle enters the liquid storage tank through the drainage channel, and a liquid pushing part is elastically slidably installed in the liquid storage tank, and the liquid pushing part is stopped up and down by the lower cleaning assembly so that it is pushed by the lower cleaning assembly and moves upward relative to the annular shell during the downward movement of the flushing assembly, thereby pushing the cleaning liquid in the storage chamber to be flushed to the inner wall of the spherical section through the drainage channel.

2. The alkali-free regeneration system for working fluid of anthraquinone method hydrogen peroxide production according to claim 1, characterized in that: A plurality of through holes are provided on the top wall of the annular shell, and each liquid storage tank has corresponding through holes above it.

3. The alkali-free regeneration system for working fluid of anthraquinone method hydrogen peroxide production according to claim 2, characterized in that: A sealing rod that can elastically move up and down is connected to the liquid pushing part, and the bottom end of the sealing rod protrudes downward from the liquid pushing part. The sealing rod is opposite to the through hole up and down. When the liquid pushing part moves downward with the flushing component, the sealing rod contacts the lower cleaning component and is pushed upward relative to the annular shell to seal the through hole.

4. The alkali-free regeneration system for working fluid in the production of hydrogen peroxide by the anthraquinone process according to claim 3, characterized in that: The liquid pushing part includes a liquid pushing plate and a column connected to the bottom of the liquid pushing plate. The liquid pushing plate slides up and down and is inserted into the liquid storage tank. The column can be pushed by the lower cleaning component and move upward relative to the annular shell, thereby driving the liquid pushing plate to move upward relative to the annular shell.

5. The alkali-free regeneration system for working fluid in the production of hydrogen peroxide by the anthraquinone process according to claim 4, characterized in that: The interior of the column is hollow, and the top end is connected to the inner cavity of the liquid storage tank. A liquid outlet is provided on the bottom side wall of the column. The sealing rod is coaxial with the column and slides up and down in the column. The sealing rod is provided with upper and lower hollow sealing blocks, which are inserted into the inner cavity of the column by sliding up and down. The sealing block can block the liquid outlet and open the liquid outlet as the sealing rod moves upward relative to the annular shell when the sealing rod is pushed by the lower cleaning assembly.

6. The alkali-free regeneration system for working fluid in the production of hydrogen peroxide by the anthraquinone process according to claim 5, characterized in that: The bottom end of the annular scraper protrudes downward from the annular shell, and the column can be moved to the point where the liquid outlet is flush with the bottom area of ​​the annular scraper when pushed by the lower cleaning assembly.

7. The alkali-free regeneration system for working fluid in production of hydrogen peroxide by anthraquinone method according to any one of claims 4 to 6, characterized in that: The lower cleaning assembly includes a connecting ring rotatably installed in the raw liquid kettle and a strip scraper connected to the bottom of the connecting ring. The positions of each column and the connecting ring correspond to each other up and down, and can be pushed upward by the connecting ring. The extension path of the strip scraper is a spiral curve. The rotation direction of the strip scraper enables it to apply a downward thrust to the attachments on the inner wall of the spherical segment when it rotates.

8. The alkali-free regeneration system for working fluid in the production of hydrogen peroxide by the anthraquinone process according to claim 7, characterized in that: A driving mechanism is installed on the raw liquid kettle, which includes a driving motor and a transmission screw. The transmission screw is rotatably installed in the raw liquid kettle, and the transmission screw is connected to the driving motor so as to be driven by the driven motor to rotate. The annular shell is spirally connected to the transmission screw. The annular scraper is installed in the raw liquid kettle in an up and down guide sliding manner. When the transmission screw rotates, it can drive the annular scraper to move up and down. The connecting ring is fixedly connected to the transmission screw and can be driven by the transmission screw to rotate.

9. An alkali-free regeneration process for anthraquinone-based hydrogen peroxide production working solution, implemented using an alkali-free regeneration system for anthraquinone-based hydrogen peroxide production working solution according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Inject the working solution into the original liquid kettle for reaction, and then let it stand for treatment; S2. After the working liquid is separated into upper and lower layers in the original liquid kettle, the solid-liquid mixture in the lower layer is discharged from the discharge port, and the discharged solid-liquid mixture is injected into the filter press from the feed port for solid-liquid separation; S3, discharge the remaining upper liquid in the raw liquid pump; S4, driving the upper cleaning assembly to move downward, the annular scraper to move downward to scrape off the attachments on the inner wall of the cylindrical segment, driving the lower cleaning assembly to rotate, the strip scraper to rotate to scrape off the attachments on the inner wall of the spherical segment; S5. The upper cleaning component continues to move to the bottom of the cylindrical section, and the flushing component sprays cleaning liquid to flush and clean the inner wall of the spherical section and the lower cleaning component.

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