Ultrafiltration and nanofiltration combined sulfuric acid decolorizing device

Abstract

The utility model discloses an ultrafiltration and nanofiltration combined sulfuric acid decolorizing device which comprises ultrafiltration equipment, nanofiltration equipment and decolorizing equipment, wherein the decolorizing equipment comprises a tank body, a first liquid dispersing assembly, a second liquid dispersing assembly, an unpowered mixing assembly and a stirring assembly are arranged in the tank body, and the tank body is used for uniformly mixing hydrogen peroxide and filtered sulfuric acid; a liquid inlet and a liquid outlet are formed in the tank body; a liquid outlet of the ultrafiltration equipment is connected with a liquid inlet of the nanofiltration equipment through a pipeline, and the ultrafiltration equipment is used for filtering sulfuric acid twice; a liquid outlet of the nanofiltration equipment is connected with a liquid inlet of the decoloration equipment through a pipeline, and the nanofiltration equipment is used for conveying filtered sulfuric acid into the decoloration equipment to be uniformly mixed with hydrogen peroxide. According to the ultra-filtration and nano-filtration combined sulfuric acid decolorizing device disclosed by the utility model, sulfuric acid and hydrogen peroxide are mixed for three times, so that the mixing efficiency and the decolorizing effect are improved.

Description

Technical Field

[0001] This utility model relates to the field of decolorization equipment technology, and in particular to a sulfuric acid decolorization device combining ultrafiltration and nanofiltration. Background Technology

[0002] Sulfuric acid is a highly reactive diprotic inorganic strong acid that reacts with most metals. High concentrations of sulfuric acid have strong hygroscopic properties and can be used as a dehydrating agent. It is also used to carbonize carbohydrate-containing materials such as wood, paper, cotton and linen fabrics, and biological hides. When mixed with water, it releases a large amount of heat. Sulfuric acid is also an important industrial raw material used in the manufacture of fertilizers, pharmaceuticals, explosives, pigments, detergents, and storage batteries. It is also widely used in petroleum purification, metal smelting, and dye industries.

[0003] In some sulfuric acid plants, due to differences in raw materials and production processes, the finished sulfuric acid may be less transparent or turn yellow or black. Therefore, hydrogen peroxide needs to be added to the discolored sulfuric acid to remove impurities and oxygen, thus achieving the purpose of decolorization. Existing decolorization devices directly mix hydrogen peroxide and sulfuric acid, which makes it difficult for sulfuric acid and hydrogen peroxide to mix evenly in a short time, affecting the decolorization efficiency. Utility Model Content

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a sulfuric acid decolorization device that combines ultrafiltration and nanofiltration.

[0005] This utility model provides a combined ultrafiltration and nanofiltration sulfuric acid decolorization device, including an ultrafiltration unit, a nanofiltration unit, and a decolorization unit. The decolorization unit includes a tank, inside which are arranged a first liquid dispersion component, a second liquid dispersion component, a non-powered mixing component, and a stirring component for uniformly mixing hydrogen peroxide with filtered sulfuric acid. The tank has an inlet and an outlet. The outlet of the ultrafiltration unit is connected to the inlet of the nanofiltration unit via a pipe for double filtration of the sulfuric acid. The outlet of the nanofiltration unit is connected to the inlet of the decolorization unit via a pipe for conveying the filtered sulfuric acid to the decolorization unit for uniform mixing with hydrogen peroxide.

[0006] Furthermore, the first liquid dispersion assembly includes a first annular pipe, which is fixed to the upper part of the tank body by a support rod; the first annular pipe is connected to the liquid inlet by a sulfuric acid inlet pipe; and multiple sulfuric acid nozzles are uniformly fixed along the circumference of the inner arc-shaped surface of the first annular pipe.

[0007] Furthermore, the second liquid dispersion component includes a second annular pipe and a hydrogen peroxide inlet pipe; wherein,

[0008] The hydrogen peroxide inlet pipeline includes a main inlet pipeline and a branch inlet pipeline that are internally connected. The main inlet pipeline is rotatably installed through the top of the tank and enters the interior of the tank. The branch inlet pipelines are symmetrically fixed on both sides of the bottom end of the main inlet pipeline. The branch inlet pipelines are L-shaped.

[0009] The second annular pipe is disposed inside the first annular pipe. The ends of the two branch inlet pipes away from the main inlet pipe are respectively fixedly connected to the top surface of the second annular pipe, and the ends of the branch inlet pipes away from the main inlet pipe are connected to the interior of the second annular pipe. Multiple hydrogen peroxide nozzles are uniformly fixedly disposed on the outer circumferential wall of the second annular pipe.

[0010] Furthermore, the non-powered mixing assembly includes symmetrically fixed guide plates on both sides of the inside of the tank, the guide plates being inclined downwards; the guide plates on both sides of the inside of the tank are staggered vertically, and the lower end of the guide plate on one side is positioned above the surface of the guide plate on the adjacent lower side.

[0011] Furthermore, the stirring assembly includes an annular frame, a stirring shaft, stirring blades, a transmission assembly, and a drive assembly; wherein,

[0012] The annular frame is fixedly installed inside the tank body below the non-powered mixing component. The annular frame includes a rotating bearing. A first support rod is uniformly fixedly installed on the outer circumferential side of the rotating bearing. The end of the first support rod away from the rotating bearing is fixedly connected to the inner wall of the tank body.

[0013] The stirring shaft is arranged vertically, with one end fixedly mounted on the inner ring transmission surface of the rotating bearing, and the other end rotatably mounted on the inner bottom surface of the tank.

[0014] The stirring blades are provided in multiple quantities and are evenly fixed on the circumferential wall surface of the stirring shaft.

[0015] The transmission assembly includes a transmission shaft and a fixing frame. The bottom end of the transmission shaft is fixedly connected to the top end of the stirring shaft. The fixing frame is disposed at the top end of the transmission shaft and includes a fixing block disposed inside the second annular pipe. A plurality of second support rods are fixedly disposed on the outer circumferential side of the fixing block. The ends of the second support rods away from the fixing block are fixedly connected to the inner arc-shaped surface of the second annular pipe. The top end of the transmission shaft is fixedly connected to the bottom surface of the fixing block. The transmission shaft passes through the surface of the guide plate.

[0016] The drive assembly includes a drive motor fixedly mounted on the top surface of the tank body, located on one side of the main liquid inlet pipe. A drive pulley is fixedly sleeved on the transmission end of the drive motor. A driven pulley is fixedly sleeved on the circumferential wall of the main liquid inlet pipe located on the outer side of the top of the tank body. A transmission belt is meshed between the drive pulley and the driven pulley to drive the main liquid inlet pipe to rotate.

[0017] Furthermore, the top surface of the guide plate is provided with crisscrossing grooves.

[0018] Furthermore, the tank body, the first annular pipe, the second annular pipe, the stirring shaft, the rotating bearing, the transmission shaft, the fixing block, and the main liquid inlet pipe are all coaxially arranged.

[0019] Furthermore, the sulfuric acid spray nozzle is tilted at a 30-degree angle toward the hydrogen peroxide spray nozzle, and the hydrogen peroxide spray nozzle is tilted at a 30-degree angle toward the sulfuric acid spray nozzle.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] This utility model discloses a combined ultrafiltration and nanofiltration sulfuric acid decolorization device. The sulfuric acid solution undergoes secondary filtration using ultrafiltration and nanofiltration equipment to remove impurities. The filtered solution is then transported to the interior of a tank for uniform mixing with hydrogen peroxide. Inside the tank, the sulfuric acid and hydrogen peroxide undergo a first mixing process using a first and second liquid dispersion component. The mixed liquid then undergoes a second mixing process by flowing downwards through multiple guide plates. Finally, the mixed liquid undergoes a third mixing process using a stirring component. Through these three mixing processes, the two liquids are effectively mixed, resulting in high mixing efficiency and excellent decolorization effect.

[0022] It should be understood that the content described in the utility model description section is not intended to limit the key or important features of the embodiments of this utility model, nor is it intended to limit the scope of this utility model.

[0023] Other features of this invention will become readily apparent from the following description. Attached Figure Description

[0024] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0025] Figure 1 A schematic diagram of a combined ultrafiltration and nanofiltration sulfuric acid decolorization device provided in an embodiment of this utility model;

[0026] Figure 2 This is a schematic diagram of the guide vane structure;

[0027] Figure 3 This is a top view of the structure after the first liquid dispersion component and the second liquid dispersion component are assembled.

[0028] Labels in the diagram: 1. Ultrafiltration equipment; 2. Nanofiltration equipment; 3. Tank; 4. Inlet; 5. Outlet; 6. First annular pipe; 7. Support rod; 8. Sulfuric acid inlet pipe; 9. Sulfuric acid nozzle; 10. Second annular pipe; 11. Main inlet pipe; 12. Sub-inlet pipe; 13. Hydrogen peroxide nozzle; 14. Guide plate; 15. Groove; 16. Rotary bearing; 17. First support rod; 18. Stirring shaft; 19. Stirring blade; 20. Drive shaft; 21. Fixing block; 22. Second support rod; 23. Through hole; 24. Drive motor; 25. Driving pulley; 26. Driven pulley; 27. Drive belt. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0030] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0031] Please refer to Figures 1-3 The present invention provides a combined ultrafiltration and nanofiltration sulfuric acid decolorization device, including an ultrafiltration device 1, a nanofiltration device 2, and a decolorization device; the sulfuric acid solution is filtered by the combined ultrafiltration device 1 and nanofiltration device 2 to improve the purity of the sulfuric acid solution, and then the sulfuric acid and hydrogen peroxide are mixed by the decolorization device to achieve decolorization.

[0032] The decolorization equipment includes a tank 3, which is equipped with a first liquid dispersion component, a second liquid dispersion component, a non-powered mixing component, and a stirring component. The hydrogen peroxide and the filtered sulfuric acid are mixed evenly through three mixing processes to decolorize the sulfuric acid.

[0033] The tank body 3 is equipped with an inlet 4 and an outlet 5; the outlet of the ultrafiltration device 1 is connected to the inlet of the nanofiltration device 2 through a pipeline for filtering sulfuric acid twice; the outlet of the nanofiltration device 2 is connected to the inlet of the decolorization device through a pipeline for transporting the filtered sulfuric acid to the decolorization device for uniform mixing with hydrogen peroxide.

[0034] In a preferred embodiment, the first liquid dispersion component includes a first annular pipe 6, which is fixed to the upper part of the tank 3 by a support rod 7; the first annular pipe 6 is connected to the liquid inlet 4 by a sulfuric acid inlet pipe 8, which is used to transport the sulfuric acid filtered by the nanofiltration device into the interior of the first annular pipe 6; a plurality of sulfuric acid nozzles 9 are uniformly fixed along the circumference on the inner arc surface of the first annular pipe 6, which are used to atomize and spray out the sulfuric acid inside the first annular pipe 6.

[0035] In a preferred embodiment, the second liquid dispersion component includes a second annular pipe 10 and a hydrogen peroxide inlet pipe; wherein,

[0036] The hydrogen peroxide inlet pipeline includes a main inlet pipeline 11 and a branch inlet pipeline 12 that are internally connected. The main inlet pipeline 11 is rotatably installed through the top of the tank 3 and enters the interior of the tank 3. The branch inlet pipelines 12 are symmetrically fixed on both sides of the bottom end of the main inlet pipeline 11. The branch inlet pipeline 11 is L-shaped.

[0037] The second annular pipe 10 is disposed inside the first annular pipe 6. The ends of the two branch inlet pipes 12 away from the main inlet pipe 11 are respectively fixedly connected to the top surface of the second annular pipe 10, and the ends of the branch inlet pipes 12 away from the main inlet pipe 11 are connected to the interior of the second annular pipe 10. This arrangement is used to transport hydrogen peroxide from the interior of the main inlet pipe 11 to the interior of the second annular pipe 10 through the branch inlet pipes 12. A plurality of hydrogen peroxide nozzles 13 are uniformly fixedly disposed on the outer circumferential wall of the second annular pipe 10, and hydrogen peroxide is atomized and sprayed out through the hydrogen peroxide nozzles 13.

[0038] In a preferred embodiment, the sulfuric acid nozzle 9 is tilted at a 30-degree angle toward the hydrogen peroxide nozzle 13, and the hydrogen peroxide nozzle 13 is tilted at a 30-degree angle toward the sulfuric acid nozzle 9; that is, the sulfuric acid nozzle 9 and the hydrogen peroxide nozzle 13 are positioned opposite each other at a certain angle, which allows the sprayed atomized sulfuric acid and hydrogen peroxide to mix better.

[0039] In a preferred embodiment, the non-powered mixing assembly includes guide plates 14 symmetrically fixedly disposed on both sides of the inside of the tank 3, with the guide plates 14 inclined downward; the guide plates 14 on both sides of the inside of the tank 3 are staggered vertically, and the lower end of the guide plate 14 on one side is disposed above the plate surface of the adjacent lower guide plate 14 on the opposite side.

[0040] In a preferred embodiment, the top surface of the guide plate 14 is provided with crisscrossing grooves 15, which allows the mixed liquid falling on the guide plate 14 to be mixed again on the guide plate 14, and the guide plate 14 and the liquid on the guide plate 14 can also be mixed again during the falling process, thereby improving the mixing effect.

[0041] In a preferred embodiment, the stirring assembly includes an annular frame, a stirring shaft 18, stirring blades 19, a transmission assembly, and a drive assembly; wherein,

[0042] An annular frame is fixedly installed inside the tank 3 below the non-powered mixing assembly. The annular frame includes a rotating bearing 16. A first support rod 17 is evenly fixedly installed on the outer circumferential side of the rotating bearing 16. The first support rod 17 is installed in the horizontal direction. The end of the first support rod 17 away from the rotating bearing 16 is fixedly connected to the inner wall of the tank 3 for fixing and supporting the rotating bearing 16.

[0043] The stirring shaft 18 is arranged vertically, with one end fixedly mounted on the inner ring transmission surface of the rotating bearing 16, and the other end rotatably mounted on the inner bottom surface of the tank 3, that is, the stirring shaft 18 is rotatably mounted inside the tank 3.

[0044] Multiple stirring blades 19 are provided and are evenly fixed on the circumferential wall surface of the stirring shaft 18.

[0045] The transmission assembly includes a transmission shaft 20 and a fixing frame. The bottom end of the transmission shaft 20 is fixedly connected to the top end of the stirring shaft 18, meaning that the transmission shaft 20 and the stirring shaft 18 are integrated and rotate synchronously. The fixing frame is located at the top end of the transmission shaft 20 and includes a fixing block 21 located inside the second annular pipe 10. Multiple second support rods 22 are fixedly arranged on the outer circumferential side of the fixing block 21. The second support rods 22 are arranged in the horizontal direction, and the end of the second support rod 22 away from the fixing block 21 is fixedly connected to the inner arc-shaped surface of the second annular pipe 10, meaning that the fixing block 21 is supported and fixed by the second support rods 22. The top end of the transmission shaft 20 is fixedly connected to the bottom surface of the fixing block 21. The transmission shaft 20 passes through the surface of the guide plate 14, meaning that a through hole 23 is provided on the surface of the guide plate 14 corresponding to the transmission shaft 20, and the transmission shaft 20 passes through the corresponding through hole 23 to avoid motion interference between the transmission shaft 20 and the guide plate 14 when rotating.

[0046] The drive assembly includes a drive motor 24 fixedly mounted on the top surface of the tank 3, located on one side of the main inlet pipe 11. The drive shaft 20 of the drive motor 24 is vertically upward. A drive pulley 25 is fixedly sleeved on the drive end of the drive motor 24. A driven pulley 26 is fixedly sleeved on the circumferential wall of the main inlet pipe 11 located on the outer side of the top of the tank 3. A transmission belt 27 is meshed between the drive pulley 25 and the driven pulley 26 to drive the main inlet pipe 11 to rotate.

[0047] In a preferred embodiment, the stirring shaft 18, the rotating bearing 16, the transmission shaft 20, the fixing block 21, and the main liquid inlet pipe 11 are coaxially arranged.

[0048] The working principle of this utility model:

[0049] During operation, the sulfuric acid stock solution is filtered sequentially through ultrafiltration equipment 1 and nanofiltration equipment 2 to remove impurities from the sulfuric acid. The filtered sulfuric acid is then transported through the inlet 4 of tank 3 to the inside of the first annular pipe 6. The sulfuric acid spray nozzle 9 on the first annular pipe 6 atomizes and sprays out the sulfuric acid. Simultaneously, hydrogen peroxide enters the branch inlet pipe 12 through the main inlet pipe 11 and then enters the inside of the second annular pipe 10, where it is atomized and sprayed out through the hydrogen peroxide spray nozzle 13. Since the hydrogen peroxide spray nozzle 13 and the sulfuric acid spray nozzle 9 are set at a certain angle relative to each other, the atomized sulfuric acid and hydrogen peroxide are mixed for the first time. Because the two liquids are atomized, the mixing effect is good.

[0050] The mixed liquid falls onto the guide plate 14, and the mixed liquid flows and mixes in the grooves 15 on the multiple guide plates 14 to achieve secondary mixing.

[0051] Synchronously, the drive motor 24 drives the active pulley 25 to rotate, which in turn drives the driven pulley 26 to rotate via the transmission belt 27, thereby driving the main liquid inlet pipe 11, the branch liquid inlet pipe 12, the second annular pipe 10, the drive shaft 20, the stirring shaft 18, and the stirring blades 19 to rotate; thus realizing the third mixing of the mixed liquid stored in the lower part of the tank 3.

[0052] Hydrogen peroxide and sulfuric acid were mixed three times inside tank 3 to improve the mixing efficiency of hydrogen peroxide and sulfuric acid and enhance the decolorization effect of sulfuric acid.

[0053] In the description of this specification, the terms "connection," "installation," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0054] In the description of this specification, the terms "one embodiment," "some embodiments," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0055] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A combined ultrafiltration and nanofiltration sulfuric acid decolorization device, characterized in that, The system includes an ultrafiltration device, a nanofiltration device, and a decolorization device. The decolorization device includes a tank containing a first liquid dispersion component, a second liquid dispersion component, a non-powered mixing component, and a stirring component for uniformly mixing hydrogen peroxide with filtered sulfuric acid. The tank has an inlet and an outlet. The outlet of the ultrafiltration device is connected to the inlet of the nanofiltration device via a pipe for double filtration of the sulfuric acid. The outlet of the nanofiltration device is connected to the inlet of the decolorization device via a pipe for conveying the filtered sulfuric acid to the decolorization device for uniform mixing with hydrogen peroxide.

2. The combined ultrafiltration and nanofiltration sulfuric acid decolorization apparatus according to claim 1, characterized in that, The first liquid dispersion assembly includes a first annular pipe, which is fixed to the upper part of the tank body by a support rod; the first annular pipe is connected to the liquid inlet by a sulfuric acid inlet pipe; and multiple sulfuric acid nozzles are uniformly fixed along the circumference on the inner arc-shaped surface of the first annular pipe.

3. The combined ultrafiltration and nanofiltration sulfuric acid decolorization apparatus according to claim 2, characterized in that, The second liquid dispersion component includes a second annular pipe and a hydrogen peroxide inlet pipe; wherein, The hydrogen peroxide inlet pipeline includes a main inlet pipeline and a branch inlet pipeline that are internally connected. The main inlet pipeline is rotatably installed through the top of the tank and enters the interior of the tank. The branch inlet pipelines are symmetrically fixed on both sides of the bottom end of the main inlet pipeline. The branch inlet pipelines are L-shaped. The second annular pipe is disposed inside the first annular pipe. The ends of the two branch inlet pipes away from the main inlet pipe are respectively fixedly connected to the top surface of the second annular pipe, and the ends of the branch inlet pipes away from the main inlet pipe are connected to the interior of the second annular pipe. Multiple hydrogen peroxide nozzles are uniformly fixedly disposed on the outer circumferential wall of the second annular pipe.

4. The combined ultrafiltration and nanofiltration sulfuric acid decolorization device according to claim 3, characterized in that, The non-powered mixing assembly includes symmetrically fixed guide plates on both sides of the inside of the tank, the guide plates being inclined downwards; the guide plates on both sides of the inside of the tank are staggered vertically, and the lower end of the guide plate on one side is positioned above the surface of the guide plate on the opposite side below.

5. The combined ultrafiltration and nanofiltration sulfuric acid decolorization apparatus according to claim 4, characterized in that, The stirring assembly includes an annular frame, a stirring shaft, stirring blades, a transmission assembly, and a drive assembly; wherein... The annular frame is fixedly installed inside the tank body below the non-powered mixing component. The annular frame includes a rotating bearing. A first support rod is evenly fixedly installed on the outer circumferential side of the rotating bearing. The end of the first support rod away from the rotating bearing is fixedly connected to the inner wall of the tank body. The stirring shaft is arranged vertically, with one end fixedly mounted on the inner ring transmission surface of the rotating bearing, and the other end rotatably mounted on the inner bottom surface of the tank. The stirring blades are provided in multiple quantities and are evenly fixed on the circumferential wall surface of the stirring shaft. The transmission assembly includes a transmission shaft and a fixing frame. The bottom end of the transmission shaft is fixedly connected to the top end of the stirring shaft. The fixing frame is disposed at the top end of the transmission shaft and includes a fixing block disposed inside the second annular pipe. A plurality of second support rods are fixedly disposed on the outer circumferential side of the fixing block. The ends of the second support rods away from the fixing block are fixedly connected to the inner arc-shaped surface of the second annular pipe. The top end of the transmission shaft is fixedly connected to the bottom surface of the fixing block. The transmission shaft passes through the surface of the guide plate. The drive assembly includes a drive motor fixedly mounted on the top surface of the tank body, located on one side of the main liquid inlet pipe. A drive pulley is fixedly sleeved on the transmission end of the drive motor. A driven pulley is fixedly sleeved on the circumferential wall of the main liquid inlet pipe located on the outer side of the top of the tank body. A transmission belt is meshed between the drive pulley and the driven pulley to drive the main liquid inlet pipe to rotate.

6. The combined ultrafiltration and nanofiltration sulfuric acid decolorization apparatus according to claim 5, characterized in that, The top surface of the guide plate is provided with crisscrossing grooves.

7. The combined ultrafiltration and nanofiltration sulfuric acid decolorization apparatus according to claim 6, characterized in that, The tank body, the first annular pipe, the second annular pipe, the stirring shaft, the rotating bearing, the transmission shaft, the fixing block, and the main liquid inlet pipe are all coaxially arranged.

8. The combined ultrafiltration and nanofiltration sulfuric acid decolorization apparatus according to claim 7, characterized in that, The sulfuric acid nozzle is tilted at a 30-degree angle toward the hydrogen peroxide nozzle, and the hydrogen peroxide nozzle is tilted at a 30-degree angle toward the sulfuric acid nozzle.

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