A wastewater treatment device in hydrogen peroxide production process

Abstract

The invention relates to the technical field of wastewater treatment, and specifically discloses a wastewater treatment device in a hydrogen peroxide production process; the device comprises a filter unit, an ion resin treatment unit and a clean water collection box which are sequentially connected through an infusion pump and a pipeline, the ion resin treatment unit comprises a cation resin treatment device and an anion resin treatment device, the cation resin treatment device and the anion resin treatment device both comprise an upper water inlet box, a lower water collection box and a resin filter cartridge, the resin filter cartridge is rotatably arranged between an arc-shaped opening at the lower end of the upper water inlet box and an arc-shaped slide seat at the upper end of the lower water collection box; the wastewater treatment device can effectively purify wastewater generated in the hydrogen peroxide production process, so that the wastewater finally treated can fully meet the discharge standard and the reuse standard, and the ion exchange resin can be quickly rotated when it needs to be replaced, thereby achieving the effect of seamless switching of the ion exchange resin and realizing continuous and uninterrupted treatment of the wastewater.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, and specifically discloses a wastewater treatment device in a hydrogen peroxide production process. Background Art

[0002] The anthraquinone method for preparing hydrogen peroxide is currently the most widely used and mature hydrogen peroxide preparation process in industry. A large amount of wastewater will be generated in the process of preparing hydrogen peroxide by the anthraquinone method, and this wastewater is mainly generated by the following links. First, after a certain period of operation of the hydrogenation tower, the performance of the hydrogenation catalyst decreases, and steam is needed to be used to heat wash and regenerate the catalyst. The regeneration of the hydrogenation tower will produce a certain amount of wastewater. Second, during the operation of the production system, the clay bed needs to be replaced with deactivated clay regularly. The working fluid in the clay bed is first discharged, and then the deactivated clay is hot-washed with steam to blow away the working fluid adsorbed in the alumina, which will produce wastewater containing the working fluid. Third, in the process of preparing the working fluid and recycling the waste working fluid, desalted water is needed to wash and purify the working fluid of poor quality, and a certain amount of wastewater will be generated during the entire washing and purification process. Fourth, the system circulates the working fluid through the drying tower, and the concentrated alkali in the drying tower decomposes a small amount of hydrogen peroxide in the raffinate, regenerates some degradation products, and absorbs moisture in the working fluid. The working fluid after drying and regeneration carries a small amount of alkali liquid, which needs to be separated by gravity sedimentation in the alkali settler again. The separated alkaline water is also wastewater that needs to be treated. The wastewater generated by the above four production links of preparing hydrogen peroxide by the anthraquinone method has the characteristics of high salt content, high emulsification degree and organic matter, which is difficult to treat and has high treatment cost.

[0003] At present, the most widely used method for treating wastewater in the existing hydrogen peroxide production process is to purify the wastewater through an ion exchange resin bed. For example, the utility model patent with application number 2021200174812 discloses a hydrogen peroxide production wastewater evaporation and reuse device, which includes an evaporation system and a resin purification system. A condensate storage tank is arranged at the bottom of the cooler in the evaporation system, and the condensate storage tank is connected to the cation exchange resin bed and the anion exchange resin bed in the resin purification system in sequence. The device can make the effluent fully meet the reuse standards through the cooperation of the evaporation system and the resin purification system, but during the long-term operation of the device, the exchange resins in the cation exchange resin bed and the anion exchange resin bed will gradually lose the exchange and filtration function, so it is necessary to stop the entire equipment regularly to replace the exchange resin, and the resin replacement process is not only complicated, but also the wastewater generated during the shutdown period cannot be effectively treated. Based on the above-mentioned shortcomings of the existing device, the present application proposes a wastewater treatment device in the hydrogen peroxide production process that can effectively solve the above-mentioned technical problems. Summary of the invention

[0004] The present invention aims to provide a wastewater treatment device in a hydrogen peroxide production process, so as to effectively treat the wastewater generated in the hydrogen peroxide production process and solve the shortcomings of the resin purification system in the existing hydrogen peroxide production wastewater evaporation and reuse device.

[0005] The present invention is achieved through the following technical solutions:

[0006] A wastewater treatment device in a hydrogen peroxide production process, comprising a filtration unit, an ion resin treatment unit and a clean water collection box connected in sequence through an infusion pump and a pipeline, wherein the ion resin treatment unit comprises a cation resin treatment device and an anion resin treatment device;

[0007] The cationic resin treatment device and the anionic resin treatment device both include an upper water inlet tank, a lower water collecting tank and a resin filter cartridge, wherein the resin filter cartridge is rotatably arranged between an arc-shaped opening at the lower end of the upper water inlet tank and an arc-shaped slide seat at the upper end of the lower water collecting tank;

[0008] The resin filter cylinder includes an outer cylinder and an inner cylinder arranged concentrically, and through holes are provided on the outer cylinder and the inner cylinder. The annular inner cavity between the outer cylinder and the inner cylinder is equally divided into a plurality of resin filling cavities by a partition, and the uppermost resin filling cavity is aligned with the arc-shaped opening. A supporting pipe connected to the lower water collecting tank is fitted in the hollow channel of the inner cylinder, and a filtrate inlet is provided on the supporting pipe and is aligned with the uppermost resin filling cavity.

[0009] As a further configuration of the above scheme, resin replacement ports communicating with each resin filling cavity are evenly opened on the circumferential surface of the outer cylinder, an arc-shaped sealing plate is rotatably connected in the resin replacement port, and a through hole is also opened on the arc-shaped sealing plate.

[0010] As a further configuration of the above solution, the cationic resin treatment device and the anionic resin treatment device also include a driving device for realizing a fixed-angle rotation of the resin filter cartridge.

[0011] As a specific setting of the above scheme, the driving device includes a servo motor and a transmission belt, the output shaft of the servo motor is connected to a driving pulley, the end surface of the resin filter cylinder is provided with a driven pulley, and the transmission belt is arranged between the driving pulley and the driven pulley.

[0012] As a specific setting of the above solution, the sector angle of the arc-shaped opening is smaller than the sector angle setting corresponding to the resin filling cavity in the resin filter cartridge.

[0013] As a further configuration of the above solution, a sealing rubber layer is provided at the joint between the arc-shaped opening and the outer circumferential surface of the resin filter cylinder.

[0014] As a specific configuration of the above solution, the filtering unit includes a sewage collecting box, and a filtering device is arranged in the sewage collecting box.

[0015] As a specific configuration of the above scheme, the filtering device comprises a filtering hole slot arranged in a sewage collection box, a perforated plate is arranged in the filtering hole slot, and fiber filter balls are filled between the bottom wall of the filtering hole slot and the perforated plate.

[0016] When treating wastewater generated in a hydrogen peroxide production process, the wastewater treatment device disclosed in the present invention first filters particulate impurities in the wastewater through fiber filter balls in a filter unit, and then sequentially passes the wastewater into a cation resin treatment device and anion resin treatment device to contact the cation exchange resin and the anion exchange resin for treatment. After the treatment, the wastewater can fully meet the discharge standard and the reuse standard.

[0017] In addition, the cation resin treatment device and the anion resin treatment device in the device are improved designs based on the existing ion exchange resin bed. The resin filter cylinder is divided into several resin filling cavities by partitions arranged inside the resin filter cylinder, and then the corresponding ion exchange resin is filled in each resin filling cavity.

[0018] During the wastewater treatment process, wastewater can flow in from the upper end of the resin filling cavity each time, and after contacting with the ion exchange resin, it flows out from the hollow channel and is discharged in a directional manner under the action of the supporting pipe. After the ion exchange resin in the corresponding resin filling cavity has been used for a period of time, the entire resin filter cartridge can be rotated so that the ion exchange resin in the next resin filling cavity can be put into use immediately, without affecting the continuous use of the entire wastewater treatment device. At the same time, the rotated ion exchange resin can be quickly unloaded and new ion exchange resin can be filled in time. The entire ion exchange resin replacement process is very convenient and fast. Beneficial Effects

[0019] The wastewater treatment device disclosed in the present invention can effectively purify the wastewater generated in the hydrogen peroxide production process, so that the wastewater finally treated can fully meet the discharge standard and the reuse standard.

[0020] The wastewater treatment device disclosed in the present invention realizes the seamless switching of ion exchange resins and realizes continuous and uninterrupted treatment of wastewater through the structural design of the resin filter cartridge in its ion resin treatment unit, so that the ion exchange resin can be quickly rotated when it needs to be replaced, thereby achieving the effect of seamless switching of ion exchange resins and realizing continuous and uninterrupted treatment of wastewater.

[0021] The present invention further improves the design of the resin filter cartridge. When the ion exchange resin in the resin filling chamber needs to be replaced, the resin filter cartridge is first rotated to a certain angle, and then the arc-shaped sealing plate is opened to directly discharge the resin. Then, before the resin filling chamber is put into use, the arc-shaped sealing plate can be opened again to quickly load the new ion exchange resin and put it into use; the replacement process of the ion exchange resin in the entire wastewater treatment device is also very convenient and quick. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of the main plane structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the first three-dimensional structure of the ion resin treatment unit in the present invention;

[0025] Figure 3 It is a second three-dimensional structural schematic diagram of the ion resin treatment unit in the present invention;

[0026] Figure 4 It is a schematic diagram of the three-dimensional structure of the resin filter cartridge and the supporting pipe assembly in the present invention;

[0027] Figure 5 It is a schematic diagram of the internal planar structure of the ion resin treatment unit in the present invention;

[0028] Figure 6 For the present invention Figure 5 Schematic diagram of the enlarged structure at point A in the middle. Implementation

[0029] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0030] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. Figures 1 to 6 , and describes the application in detail with reference to embodiments. Example

[0031] Example 1 discloses a wastewater treatment device in a hydrogen peroxide production process. Figure 1 The wastewater treatment device includes a primary filtration unit 1, a cationic resin treatment unit 2, an anionic resin treatment unit 3, a clean water collection box 4 and a wastewater transportation pipeline unit. The wastewater transportation pipeline unit sequentially connects the primary filtration unit 1, the cationic resin treatment unit 2, the anionic resin treatment unit 3 and the collection box 4, so that the wastewater generated in the hydrogen peroxide production process is sequentially filtered, treated with a cationic resin exchange and treated with an anionic resin exchange before being sent to the clean water collection box 4.

[0032] Reference Figure 1 The primary filter unit 1 comprises a sewage collection box 101 and a filter hole slot 102. The top of the filter hole slot 102 is provided with an outward-turned edge, and the filter hole slot 102 is fixed in the top opening of the sewage collection box 101 through the edge on the filter hole slot 102. A perforated plate 103 matching the inner wall of the filter hole slot 102 is provided inside the filter hole slot 102, and a large number of fiber filter balls 104 are filled in the space between the bottom wall of the filter hole slot 102 and the perforated plate 103. In order to ensure the installation stability of the perforated plate 103, a vertical upward positioning rod 105 is also connected to the bottom wall of the filter hole slot 102, and a positioning through hole matching the positioning rod 105 is opened on the perforated plate 103. The wastewater generated in the hydrogen peroxide production process is poured into the upper opening of the filter hole groove 102, and then the wastewater passes through the perforated plate 103 and enters between the bottom wall of the filter hole groove 102 and the perforated plate 103, and then is preliminarily filtered under the action of the fiber filter ball 104, and the preliminarily filtered wastewater is gathered at the bottom of the sewage collection tank 101 through the filter hole groove 102.

[0033] Reference Figure 2 To Attachment Figure 6 The structural designs of the cation resin treatment unit 2 and the anion resin treatment unit 3 are corresponding, and only the types of adsorption filtration resins filled inside are different. The cation resin treatment unit 2 is filled with cation exchange resins, and the anion resin treatment unit 3 is filled with anion exchange resins. The installation order of the cation resin treatment unit 2 and the anion resin treatment unit 3 can be exchanged according to actual conditions. Both of them include a filter box seat 5 and a resin filter cartridge 6. The filter box seat 5 includes an upper water inlet box 501 and a lower water collection box 502. The upper water inlet box 501 and the lower water collection box 502 are fixedly connected by a plurality of support rods, and the resin filter cartridge 6 is rotatably arranged between the upper water inlet box 501 and the lower water collection box 502.

[0034] The resin filter cartridge 6 comprises an outer cylinder 601 and an inner cylinder 602 which are arranged concentrically, and a plurality of radial partitions 603 are evenly arranged in the annular gap between the outer cylinder 601 and the inner cylinder 602. In the present figure, there are four radial partitions 603, and the outer cylinder 601 and the inner cylinder 602 are divided into four identical resin filling cavities by the four radial partitions 603, and then the corresponding ion exchange resin is filled in the resin filling cavities. A large number of through holes 604 are opened on the circumferential surfaces of the outer cylinder 601 and the inner cylinder 602, and the aperture of the through holes 604 is smaller than the particle size of the resin particles, so as to prevent the resin particles from leaking out of the through holes 604 during the filtration process.

[0035] An arc-shaped opening 503 is provided at the lower end of the upper water inlet tank 501 and is fitted with the outer cylinder 601. The fan angle of the arc-shaped opening 503 is smaller than the fan angle of the resin filling cavity, so as to ensure that the wastewater flowing from the arc-shaped opening 503 can all enter the topmost resin filling cavity. Then, a sealing rubber layer 504 is provided at the joints around the arc-shaped opening 503 to prevent the wastewater from flowing out of the gap at the joints between the two. At the same time, an arc-shaped slide seat 505 is provided at the upper end of the lower water collecting tank 502 and is fitted with the outer cylinder 601, so that the resin filter cylinder 6 can rotate around its own central axis between the arc-shaped opening 503 and the arc-shaped slide seat 505.

[0036] A support pipe 7 is fixedly arranged in the resin filter cylinder 6 along its central axis, and is fitted with the hollow channel of the inner cylinder 602. The support pipe 7 is made of seamlessly welded stainless steel plates to have a certain support strength, and the lower end of the support pipe 7 is connected to the lower water collecting tank 502. A filtrate inlet 701 corresponding to the uppermost resin filling cavity is opened at the upper end of the support pipe 7.

[0037] Finally, the wastewater delivery pipeline unit includes a delivery pump 8 arranged in the sewage collection box 101 and the lower water collection box 502, and the delivery pump 8 is connected to a delivery pipe 9 connected to the next unit. During the operation of the wastewater treatment device in this embodiment, the fiber filter ball 104 in the primary filter unit 1 first performs preliminary filtration on the wastewater generated in the hydrogen peroxide production process to remove the mixed particulate impurities. Then, the wastewater is delivered to the upper water inlet box 501 of the cationic resin treatment unit 2 through the delivery pump 8 and the delivery pipe 9, and then the wastewater enters the resin filling cavity at the upper end of the resin filter cylinder 6 through the arc-shaped opening 503 and contacts the cationic exchange resin, so that the metal cations in the wastewater exchange with the H+ on the cationic exchange resin, which can effectively remove the metal cations in the wastewater, and the wastewater after the metal cations are removed enters the support pipe 7 through the filtrate inlet 701, and enters the lower water collection box 502 along the support pipe 7. Then the wastewater after cation exchange enters the anion resin treatment unit 3 to repeat the above process and contact with the anion exchange resin, so that the anions in the wastewater solution are exchanged with the OH- on the anion exchange resin, which can effectively remove the anions in the wastewater. At this time, H+ and OH- combine to generate water. Finally, the wastewater after anion exchange has been purified and can be sent to the clean water collection box 4 through the delivery pump 8 and the delivery pipe 9.

[0038] In addition, when the treatment effect of the cationic resin treatment unit 2 and the anionic resin treatment unit 3 on wastewater in the wastewater treatment device decreases, the operator can manually rotate the resin filter cartridge 6 at a fixed angle to switch the new resin filling chamber to align with the arc-shaped opening 503. At this time, the new ion exchange resin in the resin filling chamber can immediately improve the treatment efficiency of the wastewater. Example

[0039] Example 2 discloses a wastewater treatment device in a hydrogen peroxide production process that is improved and designed based on Example 1. Its primary filter unit 1, clean water collection box 4 and wastewater transport pipeline unit are the same as those of Example 1. The difference between Example 2 and Example 1 lies in the design of the resin filter cartridge 6 in the cationic resin treatment unit 2 and the anionic resin treatment unit 3.

[0040] The similarities between this embodiment 2 and embodiment 1 are not described again. The difference is that Figure 2 , Attachment Figure 3 and attached Figure 4In this embodiment 2, resin replacement ports 605 communicating with each resin filling cavity are evenly opened on the outer circumferential surface of the outer cylinder 601, and an arc-shaped sealing plate 606 is rotatably connected in each resin replacement port 605, and a large number of through holes 604 are also opened on the arc-shaped sealing plate 606. In addition, fasteners (not shown in the figure) can be set between the closed ends of the arc-shaped sealing plate 606 and the resin replacement port 605. The specific fasteners can be bolts or other methods, as long as the arc-shaped sealing plate 606 is closed in the resin replacement port 605 and the arc-shaped sealing plate 606 is fixed by the fasteners.

[0041] In addition, the cationic resin treatment unit 2 and the anionic resin treatment unit 3 also include a driving device for realizing automatic rotation of the resin filter cartridge 6, the driving device includes a servo motor 10 fixed on the upper water inlet tank 501, a driving pulley is connected to the output shaft of the servo motor, and a driven pulley 12 is concentrically connected to the end face of the resin filter cartridge 6, and then a transmission belt 11 is arranged between the driving pulley and the driven pulley. By controlling the rotation and number of revolutions of the servo motor 10, the resin filter cartridge 6 can be rotated around its own central axis to a set angle to realize the switching of the resin filling cavity in the resin filter cartridge 6.

[0042] The wastewater treatment device in this embodiment 2 can be set to start the servo motor 10 once every period of operation, and then the resin filter cartridge 6 is rotated by a certain angle through the transmission action of the transmission belt 11. When the resin filling chamber in the resin filter cartridge 6 is switched, the operator can open the arc-shaped sealing plate 606 on the resin filling chamber that rotates out of the arc-shaped opening 503, and then discharge the failed ion exchange resin, and at the same time load new ion exchange resin on the opposite side. After loading, the arc-shaped sealing plate 606 is fixed by fasteners to prepare for the next use.

[0043] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A wastewater treatment device in a hydrogen peroxide production process, characterized in that: It includes a filtration unit, an ion resin treatment unit and a clean water collection box which are sequentially connected through an infusion pump and a pipeline, wherein the ion resin treatment unit includes a cation resin treatment device and an anion resin treatment device; The cationic resin treatment device and the anionic resin treatment device both include an upper water inlet tank, a lower water collecting tank and a resin filter cartridge, wherein the resin filter cartridge is rotatably arranged between an arc-shaped opening at the lower end of the upper water inlet tank and an arc-shaped slide seat at the upper end of the lower water collecting tank; The resin filter cartridge comprises an outer cylinder and an inner cylinder arranged concentrically, and through holes are provided on the outer cylinder and the inner cylinder, the annular inner cavity between the outer cylinder and the inner cylinder is equally divided into a plurality of resin filling cavities by a partition, and the uppermost resin filling cavity is aligned with the arc-shaped opening, a support pipe connected to the lower water collecting tank is fitted in the hollow channel of the inner cylinder, and a filtrate inlet is provided on the support pipe and is aligned with the uppermost resin filling cavity; Resin replacement ports communicating with each resin filling cavity are evenly provided on the circumferential surface of the outer cylinder, an arc-shaped sealing plate is rotatably connected in the resin replacement port, and a through hole is also provided on the arc-shaped sealing plate.

2. The wastewater treatment device in the hydrogen peroxide production process according to claim 1, characterized in that: The cation resin treatment device and the anion resin treatment device also include a driving device for realizing the fixed-angle rotation of the resin filter cartridge.

3. The wastewater treatment device in the hydrogen peroxide production process according to claim 2, characterized in that: The driving device comprises a servo motor and a transmission belt. The output shaft of the servo motor is connected with a driving pulley. The end surface of the resin filter cylinder is provided with a driven pulley. The transmission belt is provided between the driving pulley and the driven pulley.

4. The wastewater treatment device in the hydrogen peroxide production process according to claim 1, characterized in that: The sector angle of the arc-shaped opening is smaller than the sector angle corresponding to the resin filling cavity in the resin filter cartridge.

5. The wastewater treatment device in the hydrogen peroxide production process according to claim 1 or 4, characterized in that: A sealing rubber layer is arranged at the joint between the arc-shaped opening and the outer circumferential surface of the resin filter cylinder.

6. The wastewater treatment device in the hydrogen peroxide production process according to claim 1, characterized in that: The filtering unit comprises a sewage collecting box, in which a filtering device is arranged.

7. The wastewater treatment device in the hydrogen peroxide production process according to claim 6, characterized in that: The filtering device comprises a filtering hole slot arranged in a sewage collection box, a perforated plate is arranged in the filtering hole slot, and fiber filtering balls are filled between the bottom wall of the filtering hole slot and the perforated plate.

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