Adsorption recovery device

Abstract

The utility model relates to the technical field of wastewater treatment, and provides an adsorption recovery device which comprises a wastewater storage tank; the adsorption assembly comprises at least one adsorption tower; the desorption assembly comprises an alkali washing tank group and a desorption liquid tank; and the regeneration assembly comprises a pickling tank and a washing tank group. The o-aminobenzoic acid wastewater is adsorbed by the adsorption assembly, the adsorption material in the adsorption tower is desorbed by the alkali washing tank group, then the acid washing tank and the water washing tank group are used for cleaning, regeneration and recycling, the o-aminobenzoic acid product is enriched in the desorption liquid, other impurities are not introduced, the product recovery difficulty is reduced, and the product recovery efficiency is improved. The recovery rate of anthranilic acid in the wastewater is high.

Description

Technical Field

[0001] This application relates to the technical field of wastewater treatment, and particularly to an adsorption and recovery device. Background Art

[0002] The wastewater generated in the production processes such as amidation, esterification, diazotization, acid precipitation, neutralization, methanol distillation, and toluene distillation of sodium saccharin contains methyl ester mother liquor, toluene residue, alkali (including ammonia water), acid, and Cu 2+ . The wastewater not only contains a large amount of organic substances such as anthranilic acid, phthalic acid, o-aminotoluene or m,p-xylene, insoluble saccharin, methyl anthranilate, sodium anthranilate, methanol, methyl o-chlorobenzoate, and phthalic anhydride, but also contains Cu 2+ , NH 4 + , Na + , SO 4 2- , and Cl - and other inorganic substances; moreover, the COD content of such wastewater is very high, generally reaching 22000 mg / L, the salt content reaches 15%, and the anthranilic acid in the water is about 8000 mg / L - 10000 mg / L, making it difficult to recover. Utility Model Content

[0003] Based on this, an embodiment of this application provides an adsorption and recovery device with high recovery efficiency of anthranilic acid.

[0004] In a first aspect, this application provides an adsorption and recovery device, which includes:

[0005] A wastewater storage tank for storing anthranilic acid wastewater;

[0006] An adsorption component, including at least one adsorption tower, which is connected to the wastewater storage tank and is used for adsorbing and recovering anthranilic acid in the anthranilic acid wastewater;

[0007] A desorption component, including an alkali washing tank group and a desorption liquid tank. The alkali washing tank group is connected to the inlet pipe of the adsorption tower for alkali desorption of the adsorption tower; the desorption liquid tank is connected to the drain pipe of the adsorption tower for storing the desorption liquid discharged from the adsorption tower after alkali desorption;

[0008] A regeneration component, including an acid washing tank and a water washing tank group. The water washing tank group is connected to the inlet pipe of the adsorption tower for water washing and regeneration of the adsorption tower after alkali desorption; the acid washing tank is connected to the inlet pipe of the adsorption tower for acid washing and regeneration of the adsorption tower after water washing and regeneration.

[0009] In some embodiments, the caustic scrubber group includes a first caustic scrubber and a second caustic scrubber. Among them, the first caustic scrubber and the second caustic scrubber are respectively connected to the liquid inlet pipe of the adsorption tower. The first caustic scrubber is used for neutralizing the adsorption tower after adsorption drainage, and the second caustic scrubber is used for caustic desorption of the adsorption tower after the neutralization treatment. After the caustic desorption of the adsorption tower, the liquid is drained through the drain pipe to the desorption liquid tank.

[0010] In some embodiments, the water scrubber group includes a first water scrubber, a second water scrubber, and a third water scrubber. Among them, the first water scrubber, the second water scrubber, and the third water scrubber are respectively connected to the liquid inlet pipe of the adsorption tower; the first water scrubber is used for the first water washing and regeneration of the adsorption tower after caustic desorption, the second water scrubber is used for the second water washing and regeneration of the adsorption tower after the first water washing and regeneration, and the third water scrubber is used for the third water washing and regeneration of the adsorption tower after the second water washing and regeneration.

[0011] In some embodiments, the first caustic scrubber is connected to the drain pipe of the adsorption tower. After the first water washing and regeneration of the adsorption tower, the liquid is drained through the drain pipe into the first caustic scrubber.

[0012] In some embodiments, the second caustic scrubber is connected to the drain pipe of the adsorption tower. After the second water washing and regeneration of the adsorption tower, the liquid is drained into the second caustic scrubber.

[0013] In some embodiments, the second water scrubber is connected to the drain pipe of the adsorption tower. After the third water washing and regeneration of the adsorption tower, the liquid is drained into the second water scrubber.

[0014] In some embodiments, the third water scrubber is connected to the drain pipe of the adsorption tower. After the neutralization treatment of the adsorption tower, the liquid is drained into the third water scrubber.

[0015] In some embodiments, the first water scrubber is connected to the drain pipe of the adsorption tower. After the pickling regeneration of the adsorption tower, the liquid is drained into the first water scrubber.

[0016] In some embodiments, a heater is provided on the liquid inlet pipe of the adsorption tower, and the heater is used to heat the caustic scrubbing liquid entering the adsorption tower from the caustic scrubber group.

[0017] In some embodiments, the adsorption recovery device further includes a pretreatment component. The pretreatment component includes a cooler, a first pH adjuster, and a filter arranged in sequence. The water outlet end of the filter is connected to the wastewater storage tank.

[0018] In some embodiments, the adsorption and recovery device further includes a water purification component, which includes a trap, a second pH regulator, an oxidizer, and an evaporation crystallizer arranged in sequence. The drain pipe of the adsorption tower is connected to the trap, and the o-aminobenzoic acid wastewater after adsorption treatment in the adsorption tower is discharged into the trap through the drain pipe.

[0019] In some embodiments, the adsorption and recovery device further includes a gas source, which is connected to the adsorption tower and is used to evacuate the adsorption tower.

[0020] Compared with the traditional technology, the present application has at least the following beneficial effects:

[0021] In the present application, the o-aminobenzoic acid wastewater is adsorbed by the adsorption component, the adsorption material in the adsorption tower is desorbed by the alkali washing tank group, and then the acid washing tank and the water washing tank group are used for cleaning and recycling. The o-aminobenzoic acid product is enriched in the desorption liquid, and no other impurities are introduced, reducing the difficulty of product recovery and having a high recovery rate of o-aminobenzoic acid in the wastewater. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 FIG. is a schematic structural diagram of the adsorption and recovery device provided in a specific embodiment of the present application.

[0023] Wherein, 100 - pretreatment component; 110 - cooler; 120 - first pH regulator; 130 - filter; 200 - wastewater storage tank; 210 - fine filter; 300 - adsorption component; 310 - adsorption tower; 320 - heater; 400 - desorption component; 410 - alkali washing tank group; 411 - first alkali washing tank; 412 - second alkali washing tank; 420 - desorption liquid tank; 500 - regeneration component; 510 - water washing tank group; 511 - first water washing tank; 512 - second water washing tank; 513 - third water washing tank; 520 - acid washing tank; 600 - purification component; 610 - trap; 620 - second pH regulator; 630 - oxidizer; 640 - evaporation crystallizer; 700 - gas source. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following will further describe the present application in detail in combination with embodiments and examples. These embodiments and examples are only used to illustrate the present application and not to limit the scope of the present application. The purpose of providing these embodiments and examples is to make the understanding of the disclosed content of the present application more thorough and comprehensive. It should also be understood that the present application can be implemented in many different forms and is not limited to the embodiments and examples described herein. Those skilled in the art can make various changes or modifications without departing from the connotation of the present application, and the equivalent forms obtained also fall within the protection scope of the present application. In addition, in the following description, a large number of specific details are given to provide a more thorough understanding of the present application. It should be understood that the present application can be implemented without one or more of these details.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the description of this application herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0026] In this application, "optionally", "optional", "option" mean that it can be either present or absent, that is, it refers to any one of the two parallel options of "present" or "absent". If the term "optional" appears multiple times in a technical solution, unless otherwise specified and there is no contradiction or mutual restriction relationship, each "optional" is independent of each other.

[0027] In this application, in "the first aspect", "the second aspect", etc., the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or quantity, nor can they be understood as implicitly indicating the importance or quantity of the indicated technical features. Moreover, "first", "second", etc. only serve the purpose of non-exhaustive listing and description, and it should be understood that they do not constitute a closed limitation on quantity.

[0028] In this application, for the technical features described in an open-ended manner, it includes a closed technical solution composed of the listed features, and also includes an open technical solution containing the listed features.

[0029] In this application, when it comes to numerical intervals (i.e., numerical ranges), unless otherwise specified, the distribution of the selectable numerical values within the numerical interval is considered continuous, and includes the two numerical endpoints of the numerical interval (i.e., the minimum value and the maximum value), as well as each numerical value between these two numerical endpoints. Unless otherwise specified, when the numerical interval only refers to the integers within the numerical interval, it includes the two endpoint integers of the numerical range, as well as each integer between the two endpoints, which is equivalent to directly listing each integer. When multiple numerical ranges are provided to describe features or characteristics, these numerical ranges can be combined. In other words, unless otherwise specified, the numerical ranges disclosed in this application should be understood to include any and all sub-ranges subsumed therein. The "numerical value" in this numerical interval can be any quantitative value, such as a number, a percentage, a ratio, etc. The "numerical interval" is allowed to broadly include quantitative intervals such as percentage intervals, ratio intervals, and ratio value intervals.

[0030] All documents mentioned in this application are cited as references in this application, just as if each document was cited separately as a reference. Unless it conflicts with the application purpose and / or technical solution of this application, the cited documents involved in this application are cited for their entire content and entire purpose. When this application involves cited documents, the definitions of relevant technical features, terms, nouns, phrases, etc. in the cited documents are also cited. When this application involves cited documents, the examples and preferred methods of the relevant technical features cited can also be incorporated as references into this application, but only to the extent that this application can be implemented. It should be understood that when the cited content conflicts with the description in this application, this application shall prevail or be amended adaptively according to the description in this application.

[0031] In the traditional technology, the acidic copper acid water generated in the production process of saccharin sodium is neutralized with o-aminobenzoic acid wastewater (pH 9 - 10), and the pH is adjusted to about 4 to precipitate o-aminobenzoic acid. First, the supernatant after precipitation contains copper ions, which increases the pressure for the supernatant evaporation system to recover salt. Second, when the o-aminobenzoic acid precipitate is dissolved with alkali, the copper ions remaining on the precipitate will form copper precipitate, and filtration treatment is still required, which affects the recovery efficiency. This application recovers o-aminobenzoic acid by adsorption, without introducing other foreign ions additionally. Through alkali elution desorption, water washing regeneration, and acid washing regeneration, the adsorbent can be recycled and no additional waste is generated, effectively ensuring the recovery efficiency.

[0032] In the first aspect of this application, an adsorption recovery device is provided, as Figure 1 shown. The adsorption recovery device includes:

[0033] A wastewater storage tank 200, which stores o-aminobenzoic acid wastewater inside;

[0034] The adsorption assembly 300 includes at least one adsorption tower 310. The adsorption tower 310 is connected to the wastewater storage tank 200 and is used for adsorbing and recovering anthranilic acid in the anthranilic acid wastewater.

[0035] The desorption assembly 400 includes an alkali washing tank group 410 and a desorption liquid tank 420. The alkali washing tank group 410 is connected to the liquid inlet pipe of the adsorption tower 310 and is used for alkali desorption of the adsorption tower 310. The desorption liquid tank 420 is connected to the drain pipe of the adsorption tower 310 and is used for storing the desorption liquid discharged from the adsorption tower 310 after alkali desorption.

[0036] The regeneration assembly 500 includes an acid washing tank 520 and a water washing tank group 510. The water washing tank group 510 is connected to the liquid inlet pipe of the adsorption tower 310 and is used for water washing and regenerating the adsorption tower 310 after alkali desorption. The acid washing tank 520 is connected to the liquid inlet pipe of the adsorption tower 310 and is used for acid washing and regenerating the adsorption tower 310 after water washing regeneration.

[0037] In this application, the anthranilic acid wastewater is adsorbed by the adsorption assembly 300, the adsorption material in the adsorption tower 310 is desorbed by the alkali washing tank group 410, and then the acid washing tank 520 and the water washing tank group 510 are used for cleaning and regeneration for recycling. The anthranilic acid product is enriched in the desorption liquid, and no other impurities are introduced, reducing the difficulty of product recovery, and the recovery rate of anthranilic acid in the wastewater is high.

[0038] It can be understood that this application does not make specific requirements and special limitations on the adsorbent in the adsorption tower 310, as long as it can adsorb anthranilic acid. For example, the adsorbent can be an adsorbent capable of adsorbing carboxyl functional groups or a styrene-based adsorption resin.

[0039] It can be understood that this application does not make specific requirements and special limitations on the composition of the alkali solution in the alkali washing tank group 410, and it can be reasonably selected according to the requirements in the alkali desorption process. For example, the alkali solution can be a sodium hydroxide solution.

[0040] It can be understood that this application does not make specific requirements and special limitations on the acid washing solution in the acid washing tank 520, as long as it can meet the recycling of the adsorbent in the adsorption tower 310. For example, the acid washing solution can be a hydrochloric acid solution.

[0041] It can be understood that the desorption liquid in the desorption liquid tank 420 is dropped with an acidic solution to precipitate and collect anthranilic acid.

[0042] In some embodiments, the caustic scrubber group 410 includes a first caustic scrubber 411 and a second caustic scrubber 412. Among them, the first caustic scrubber 411 and the second caustic scrubber 412 are respectively connected to the liquid inlet pipe of the adsorption tower 310. The first caustic scrubber 411 is used to neutralize the adsorption tower 310 after adsorption and drainage, and the second caustic scrubber 412 is used to perform caustic desorption on the adsorption tower 310 after neutralization treatment. After caustic desorption, the adsorption tower 310 drains water to the desorption liquid tank 420 through the drain pipe. In this application, the first caustic scrubber 411 performs caustic washing and neutralization on the adsorption tower 310 adsorbed with anthranilic acid, adjusts the pH in the adsorption tower 310, thereby improving the adsorption efficiency of the second caustic scrubber 412 during the caustic desorption process.

[0043] In some embodiments, the concentration of the caustic solution in the first caustic scrubber 411 is lower than the concentration of the caustic solution in the second caustic scrubber 412.

[0044] In some embodiments, the water scrubber group 510 includes a first water scrubber 511, a second water scrubber 512, and a third water scrubber 513. Among them, the first water scrubber 511, the second water scrubber 512, and the third water scrubber 513 are respectively connected to the liquid inlet pipe of the adsorption tower 310; the first water scrubber 511 is used to perform the first water washing and regeneration on the adsorption tower 310 after caustic desorption, the second water scrubber 512 is used to perform the second water washing and regeneration on the adsorption tower 310 after the first water washing and regeneration, and the third water scrubber 513 is used to perform the third water washing and regeneration on the adsorption tower 310 after the second water washing and regeneration.

[0045] In some embodiments, the first caustic scrubber 411 is connected to the drain pipe of the adsorption tower 310. After the first water washing and regeneration, the adsorption tower 310 drains water into the first caustic scrubber 411 through the drain pipe. In this application, the drained water after the first water washing and regeneration is drained into the first caustic scrubber 411 as the caustic solution raw material for neutralizing the adsorption tower 310, reducing the water consumption of fresh water and improving the utilization rate of washing water. It can be understood that the concentration of the caustic solution in the first caustic scrubber 411 can be adjusted by adding additional alkaline substances.

[0046] In some embodiments, the second caustic scrubber 412 is connected to the drain pipe of the adsorption tower 310. After the second water washing and regeneration, the adsorption tower 310 drains water into the second caustic scrubber 412. In this application, the drained water of the adsorption tower 310 after the second water washing and regeneration is drained into the second caustic scrubber 412 as the caustic solution raw material for caustic desorption in the second caustic scrubber 412, reducing the water consumption of fresh water and improving the utilization rate of washing water. It can be understood that the concentration of the caustic solution in the second caustic scrubber 412 can be adjusted by adding additional alkaline substances.

[0047] In some embodiments, the second water washing tank 512 is connected to the drain pipe of the adsorption tower 310. After the third water washing and regeneration of the adsorption tower 310, the drained water is discharged into the second water washing tank 512. In this application, the drained water of the adsorption tower 310 after the third water washing is discharged into the second water washing tank 512 as the water washing liquid for the second water washing and regeneration, reducing the water consumption of fresh water and improving the utilization rate of washing water.

[0048] In some embodiments, the third water washing tank 513 is connected to the drain pipe of the adsorption tower 310. After the neutralization treatment of the adsorption tower 310, the drained water is discharged into the third water washing tank 513. In this application, the drained water of the adsorption tower 310 after the neutralization treatment is discharged into the third water washing tank 513 as the water washing liquid for the third water washing and regeneration, reducing the water consumption of fresh water and improving the utilization rate of washing water.

[0049] In some embodiments, the first water washing tank 511 is connected to the drain pipe of the adsorption tower 310. After the pickling regeneration of the adsorption tower 310, the drained water is discharged into the first water washing tank 511. In this application, the drained water of the adsorption tower 310 after the pickling regeneration is discharged into the first water washing tank 511, reducing the water consumption of fresh water and improving the utilization rate of washing water.

[0050] In some embodiments, a heater 320 is provided on the liquid inlet pipe of the adsorption tower 310. The heater 320 is used to heat the caustic washing liquid entering the adsorption tower 310 from the caustic washing tank group 410. In this application, by providing the heater 320 to heat the caustic washing liquid, the desorption effect during the caustic washing and desorption process can be ensured.

[0051] Optionally, according to the treatment requirements, the heater 320 can be used to heat the water washing liquid and the pickling liquid during the water washing regeneration and the pickling regeneration processes.

[0052] In some embodiments, during the neutralization treatment of the adsorption tower 310 by the first caustic washing tank 411, through the way of circulating caustic washing, not only can the neutralization effect be improved, but also the temperature inside the adsorption tower 310 can be increased to the desorption temperature.

[0053] In this application, by using the pipeline connections in the caustic washing tank group 410, the pickling tank 520 and the water washing tank group 510, and through the repeated utilization of the caustic washing liquid, the water washing liquid and the pickling liquid in each process, the fresh water consumption is effectively reduced, the recycling of water is realized, and the utilization rate of water is improved.

[0054] In some embodiments, the adsorption and recovery device further includes a pretreatment assembly 100. The pretreatment assembly 100 includes a cooler 110, a first pH regulator 120, and a filter 130 arranged in sequence. The water outlet end of the filter 130 is connected to the wastewater storage tank 200. In this application, by pretreating the anthranilic acid wastewater, after cooling the wastewater with the cooler 110, the pH is adjusted by the first pH regulator 120 to precipitate the grease, and then the filter 130 is used to remove the grease and particulate impurities, effectively avoiding the harm caused by impurities such as grease to the adsorption tower 310.

[0055] In some embodiments, the adsorption and recovery device further includes a water purification assembly. The water purification assembly includes a trap 610, a second pH regulator 620, an oxidizer 630, and an evaporation crystallizer 640 arranged in sequence. The drain pipe of the adsorption tower 310 is connected to the trap 610. The anthranilic acid wastewater after adsorption treatment in the adsorption tower 310 is discharged into the trap 610 through the drain pipe. In this application, the wastewater after adsorption treatment in the adsorption tower 310 is discharged into the water purification assembly for purification treatment. The adsorbent resin material is filtered by the trap 610, then adjusted by the second pH regulator 620, and then subjected to oxidation treatment to remove COD, and then the evaporation crystallizer 640 is used to recover the salt substances.

[0056] Optionally, the oxidizer 630 can be a catalytic oxidizer.

[0057] Optionally, sodium hypochlorite can also be added to the second pH regulator 620 to reduce the COD in the effluent, so as to avoid the problem of unstable effluent quality caused by a high COD content in the effluent.

[0058] In some embodiments, the adsorption and recovery device further includes a gas source 700. The gas source 700 is connected to the adsorption tower 310, and the gas source 700 is used to empty the adsorption tower 310. In this application, the gas source 700 is introduced into the adsorption tower 310, and the liquid in the adsorption tower 310 is emptied by the gas.

[0059] Optionally, the liquid after the adsorption tower 310 is emptied can be discharged into the wastewater storage tank 200 or into the water purification assembly. Among them, a detector can be set to detect the concentration of anthranilic acid in the liquid after the adsorption tower 310 is emptied. When the concentration of anthranilic acid in the drained water after adsorption is high, for example, greater than the first threshold, it is discharged into the wastewater storage tank 200; if the concentration of anthranilic acid in the drained water after adsorption is low, for example, less than the first threshold, the drained water is discharged into the water purification assembly.

[0060] It can be understood that the connection between the components in this application can be connected through pipelines, and valves can be set on the pipelines to adjust the connection and closure of the pipelines.

[0061] In some embodiments, multiple adsorption towers 310 are connected in parallel. By connecting multiple adsorption towers 310 in parallel, continuous intermittent operation of the adsorption towers 310 is achieved to improve the adsorption efficiency. For example, one of the adsorption towers 310 performs caustic washing adsorption, and another adsorption tower 310 performs regeneration operation.

[0062] In some embodiments, a fine filter 210 is provided at the water outlet end of the wastewater storage tank 200. The fine filter 210 is used to filter the drainage in the wastewater storage tank 200 to avoid contaminating the adsorption tower 310 with impurities.

[0063] Exemplarily, a method for adsorbing and recovering o-aminobenzoic acid wastewater by the above adsorption recovery device is provided, including the following steps:

[0064] S1. The o-aminobenzoic acid wastewater is sequentially passed through the cooler 110, the first pH regulator 120, and the filter 130 to cool down, precipitate grease, and filter impurities of the o-aminobenzoic acid wastewater, and then it is discharged into the wastewater storage tank 200.

[0065] S2. The o-aminobenzoic acid wastewater in the wastewater storage tank 200 is discharged into the adsorption tower 310 for adsorption. After adsorption saturation, the adsorbed wastewater in the adsorption tower 310 is emptied into the wastewater storage tank 200 or the purification component 600 by using the gas source 700.

[0066] S3. After the adsorption tower 310 is emptied, the caustic washing solution in the first caustic washing tank 411 is heated by the heater 320 to perform neutralization treatment on the adsorption tower 310, and it is circulated for a period of time to raise the temperature in the adsorption tower 310 to the desorption temperature; then the drained water after neutralization treatment is discharged into the third water washing tank 513; the caustic washing solution in the second caustic washing tank 412 is heated by the heater 320 to perform caustic washing adsorption on the adsorption tower 310, and the drained water after caustic washing adsorption is discharged into the desorption liquid tank 420. Further, caustic solution can be dropped into the desorption liquid in the desorption liquid tank 420 to precipitate o-aminobenzoic acid.

[0067] S4. After the adsorption tower 310 is drained after caustic washing adsorption, the first water washing tank 511 is used to perform the first water washing regeneration on the adsorption tower 310, and the drained water from the first water washing regeneration is discharged into the first caustic washing tank 411 as the caustic solution raw material; the second water washing tank 512 is used to perform the second water washing regeneration on the adsorption tower 310, and the drained water from the second water washing regeneration is discharged into the second caustic washing tank 412 as the caustic solution raw material; then the third water washing tank 513 is used to perform the third water washing regeneration on the adsorption tower 310, and the drained water from the third water washing regeneration is discharged into the second water washing tank 512 as the water washing solution.

[0068] S5. The pickling tank 520 is used to perform pickling on the adsorption tower 310 after water washing regeneration, and the drained water after pickling is discharged into the first water washing tank 511 as the water washing solution, completing the regeneration of the adsorption tower 310.

[0069] S6. When the concentration of anthranilic acid in the drained water after adsorption in S2 is less than the first threshold, drain the water to the purification assembly 600. After the adsorbent resin is trapped by the trap 610, it is successively adjusted by the second pH adjuster 620, the COD is removed by the oxidizer 630, and the salt is recovered by the evaporation crystallizer 640.

[0070] In summary, the adsorption tower 310 in this application can be regenerated and recycled, and no other waste is generated. After adsorption treatment, the COD of the anthranilic acid wastewater can be reduced from 20,000 mg / L to below 3,000 mg / L, and the COD removal rate is increased to more than 85%; the anthranilic acid product is enriched in the desorption liquid, and the recovery rate reaches more than 90%; the color of the wastewater becomes nearly colorless. At the same time, adding a catalytic oxidation process to the effluent ensures the quality of the subsequent MVR evaporated salt, and the salt is white. Therefore, in this application, the anthranilic acid wastewater is adsorbed by the adsorption assembly 300, the adsorption material in the adsorption tower 310 is desorbed by the alkali washing tank group 410, and then cleaned and recycled by the acid washing tank 520 and the water washing tank group 510. The anthranilic acid product is enriched in the desorption liquid, no other impurities are introduced, the difficulty of product recovery is reduced, and the recovery rate of anthranilic acid in the wastewater is high.

[0071] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0072] The above embodiments only represent several implementation manners of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the application. It should be noted that for those of ordinary skill in the art, without departing from the concept of this application, several modifications and improvements can still be made, and these all belong to the protection scope of this application. Therefore, the protection scope of this application should be subject to the appended claims.

Claims

1. An adsorption recovery device, characterized in that: The adsorption recovery device comprises: A wastewater storage tank, wherein the wastewater storage tank stores anthranilic acid wastewater; An adsorption assembly, comprising at least one adsorption tower, wherein the adsorption tower is connected to the wastewater storage tank and is used for adsorbing and recovering anthranilic acid in the anthranilic acid wastewater; A desorption assembly, comprising an alkali washing tank group and a desorption liquid tank, wherein the alkali washing tank group is connected to the liquid inlet pipe of the adsorption tower and is used to perform alkali washing and desorption on the adsorption tower; the desorption liquid tank is connected to the liquid discharge pipe of the adsorption tower and is used to store the desorption liquid discharged from the adsorption tower after the alkali washing and desorption; The regeneration component includes a pickling tank and a water washing tank group. The water washing tank group is connected to the liquid inlet pipe of the adsorption tower and is used to perform water washing and regeneration on the adsorption tower after the alkaline washing and desorption; the pickling tank is connected to the liquid inlet pipe of the adsorption tower and is used to perform acid washing and regeneration on the adsorption tower after the water washing and regeneration.

2. The adsorption recovery device according to claim 1, characterized in that: The alkali washing tank group includes a first alkali washing tank and a second alkali washing tank, wherein the first alkali washing tank and the second alkali washing tank are respectively connected to the liquid inlet pipe of the adsorption tower, the first alkali washing tank is used to neutralize the adsorption tower after adsorption drainage, and the second alkali washing tank is used to perform alkali washing and desorption on the adsorption tower after the neutralization treatment, and the adsorption tower is drained from the drainage pipe to the desorption liquid tank after the alkali washing and desorption.

3. The adsorption recovery device according to claim 2, characterized in that: The water washing tank group includes a first water washing tank, a second water washing tank and a third water washing tank, wherein the first water washing tank, the second water washing tank and the third water washing tank are respectively connected to the liquid inlet pipe of the adsorption tower; the first water washing tank is used for performing a first water washing regeneration on the adsorption tower after the alkaline washing desorption, the second water washing tank is used for performing a second water washing regeneration on the adsorption tower after the first water washing regeneration, and the third water washing tank is used for performing a third water washing regeneration on the adsorption tower after the second water washing regeneration.

4. The adsorption recovery device according to claim 3, characterized in that: The first alkali washing tank is connected to the drainage pipe of the adsorption tower, and the adsorption tower is drained into the first alkali washing tank through the drainage pipe after the first water washing and regeneration; and / or, The second alkali washing tank is connected to the drainage pipe of the adsorption tower, and the adsorption tower is drained into the second alkali washing tank after the second water washing and regeneration; and / or, The second water washing tank is connected to the drain pipe of the adsorption tower, and the adsorption tower is drained into the second water washing tank after being regenerated by the third water washing.

5. The adsorption recovery device according to claim 3, characterized in that: The third water washing tank is connected to the drainage pipe of the adsorption tower, and the adsorption tower drains water to the third water washing tank after the neutralization treatment.

6. The adsorption recovery device according to claim 3, characterized in that: The first water washing tank is connected to the drainage pipe of the adsorption tower, and the adsorption tower discharges water to the first water washing tank after the acid washing and regeneration.

7. The adsorption recovery device according to any one of claims 1 to 6, characterized in that: A heater is provided on the liquid inlet pipe of the adsorption tower, and the heater is used to heat the alkali washing liquid of the alkali washing tank group entering the adsorption tower.

8. The adsorption recovery device according to any one of claims 1 to 6, characterized in that: The adsorption recovery device also includes a pretreatment component, which includes a cooler, a first pH regulator and a filter arranged in sequence, and the water outlet end of the filter is connected to the wastewater storage tank.

9. The adsorption recovery device according to any one of claims 1 to 6, characterized in that: The adsorption recovery device also includes a water purification component, which includes a collector, a second pH regulator, an oxidizer and an evaporation crystallizer arranged in sequence. The drainage pipe of the adsorption tower is connected to the collector, and the anthranilic acid wastewater after adsorption treatment in the adsorption tower is discharged into the collector through the drainage pipe.

10. The adsorption recovery device according to any one of claims 1 to 6, characterized in that: The adsorption recovery device also includes a gas source, which is connected to the adsorption tower and is used to empty the adsorption tower.

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