Wastewater treatment device in adipic acid production process and adipic acid production system

Abstract

The embodiment of the utility model provides a wastewater treatment device in an adipic acid production process and an adipic acid production system, and belongs to the technical field of adipic acid chemical production. The utility model relates to a wastewater treatment device. The middle liquid storage tank is used for storing acidic wastewater generated in the adipic acid production process; the precipitation filtering tank is connected with the middle liquid storage tank, and an ammonia water adding port is formed in the precipitation filtering tank; the centrifugal machine is connected with the filtering outlet of the precipitation filtering tank, and an acid liquor adding opening, a dilute phase outlet and a thick phase outlet are formed in the centrifugal machine; the first evaporator assembly is provided with a first waste liquid inlet, a first adipic acid crystal outlet and a first waste liquid outlet, and the first waste liquid inlet is connected with the thick phase outlet of the centrifugal machine; the separation liquid storage tank is connected with a dilute phase outlet of the centrifugal machine; and the cold mother liquor tank is connected with the separation liquid storage tank. The wastewater treatment device realizes recovery treatment of acidic wastewater in the adipic acid production process, reduces the use of desalted water, and is more environment-friendly, energy-saving and efficient.

Description

Technical Field

[0001] The utility model belongs to the technical field of adipic acid chemical production, and particularly relates to a wastewater treatment device in the adipic acid production process and an adipic acid production system. Background Art

[0002] Adipic acid is not only an important monomer raw material for the production of nylon 66, but also has a wide range of applications in the food, medicine, chemical and other industries. In industry, nitric acid is often used to oxidize cyclohexanone to synthesize adipic acid, that is, nitric acid first oxidizes cyclohexanol to cyclohexanone, and then oxidizes cyclohexanone to adipic acid. In the production process of adipic acid, a large amount of acidic waste liquid will be generated, and direct discharge not only pollutes the environment but also wastes resources. In addition, the cost of desalted water required for production is also high. Such frequent consumption is a heavy burden for the adipic acid chemical production industry, which increases production costs and reduces economic competitiveness. Utility Model Content

[0003] In view of the above problems existing in the prior art, the purpose of the embodiment of the utility model is to provide a wastewater treatment device and an adipic acid production system in the process of adipic acid production. The wastewater treatment device realizes the recovery and treatment of acidic wastewater in the process of adipic acid production, and also reduces the use of desalted water, which is more environmentally friendly, energy-saving and efficient.

[0004] The technical solution adopted in the embodiment of the utility model is:

[0005] A wastewater treatment device in adipic acid production process, the wastewater treatment device comprising:

[0006] A central liquid storage tank, which is used to store acidic wastewater generated during the production of adipic acid;

[0007] A sedimentation and filtration tank connected to the central liquid storage tank, wherein an ammonia water inlet is provided on the sedimentation and filtration tank;

[0008] A centrifuge connected to the filter outlet of the sedimentation filter tank, wherein the centrifuge is provided with an acid solution inlet, a dilute phase outlet and a dense phase outlet;

[0009] a first evaporator assembly having a first waste liquid inlet, a first adipic acid crystallization outlet, and a first waste liquid outlet, wherein the first waste liquid inlet is connected to the dense phase outlet of the centrifuge;

[0010] A separation liquid storage tank connected to the dilute phase outlet of the centrifuge, the separation liquid storage tank having a first liquid outlet;

[0011] The cold mother liquid tank is connected to the first liquid outlet of the separation liquid storage tank.

[0012] Furthermore, a cooling component for cooling the acidic wastewater is provided in the sedimentation and filtration tank.

[0013] Furthermore, the cooling component is a cooling water pipeline.

[0014] Furthermore, the sedimentation and filtration tank is an overflow tank.

[0015] Furthermore, the wastewater treatment device also includes a cotton core filter, which is arranged in the sedimentation filter tank and located at the filter outlet of the sedimentation filter tank.

[0016] Furthermore, the separation liquid storage tank has a second liquid outlet; the wastewater treatment device also includes an activated carbon filter, and the liquid inlet of the activated filter is connected to the second liquid outlet of the separation liquid storage tank through a waste liquid pump.

[0017] Furthermore, the wastewater treatment device also includes a resin reactor assembly and a catalyst solution tank, the resin reactor assembly has a reactor waste liquid inlet, a reactor waste liquid outlet and a reactor catalyst liquid outlet, the first waste liquid outlet of the first evaporator assembly is connected to the reactor waste liquid inlet, and the reactor catalyst liquid outlet is connected to the catalyst solution tank.

[0018] Furthermore, the wastewater treatment device also includes a second evaporator component, the second evaporator component has a second waste liquid inlet, a second adipic acid crystallization outlet and a second waste liquid outlet, and the reactor waste liquid outlet is connected to the second waste liquid inlet of the second evaporator component.

[0019] An adipic acid production system comprises any one of the above-mentioned wastewater treatment devices in an adipic acid production process.

[0020] Compared with the prior art, the beneficial effects of the embodiments of the present invention are:

[0021] The wastewater treatment device of this embodiment recycles the acidic wastewater originally discharged into the sewage pool during the production of adipic acid. A portion of the wastewater passes through the centrifuge and is purified by the evaporator to purify the adipic acid crystals, and the remaining portion flows into the cold mother liquor tank to replace the desalted water, thereby reducing the use of desalted water, thereby realizing the recycling and reuse of the acidic wastewater generated in the production of adipic acid, which is more environmentally friendly, energy-saving and efficient.

[0022] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not intended to restrict the present invention.

[0023] The overview of various implementations or examples of the technology described in this utility model is not a comprehensive disclosure of the entire scope or all features of the disclosed technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In the drawings, which are not necessarily drawn to scale, the same reference numerals may describe similar components in different views. The drawings generally illustrate various embodiments by way of example and not limitation, and together with the specification and claims, are used to illustrate the embodiments of the utility model. When appropriate, the same reference numerals are used throughout the drawings to refer to the same or similar parts.

[0025] Figure 1 This is a schematic structural diagram of a wastewater treatment device in adipic acid production process according to an embodiment of the utility model;

[0026] Figure 2 It is a schematic structural diagram of a sedimentation and filtration tank according to an embodiment of the utility model.

[0027] In the figure: 10, acid waste liquid storage tank; 11, central storage tank; 12, sedimentation filter tank; 13, PP cotton core filter; 14, centrifuge; 15, separation liquid storage tank; 16, cold mother liquid tank; 17, waste liquid pump; 18, activated carbon filter; 19, first evaporator assembly; 20, resin reactor assembly; 200, reactor feed tank; 201, resin reactor; 21, catalyst solution tank; 22, concentration tower; 23, second evaporator assembly; 230, evaporator feed tank; 231, evaporator body; 24, power pump; 25, cooling water pipeline. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution of the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings of the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the described embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the usual meanings understood by persons with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" and the like mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0030] In order to keep the following description of the embodiments of the present invention clear and concise, the present invention omits detailed descriptions of known functions and known components.

[0031] like Figure 1 As described above, an embodiment of the utility model provides a wastewater treatment device in the adipic acid production process, which includes an acidic waste liquid storage tank 10, a central liquid storage tank 11, a sedimentation filter tank 12, a centrifuge 14, a first evaporator assembly 19, a separation liquid storage tank 15 and a cold mother liquid tank 16.

[0032] The acid waste liquid storage tank 10 is used to collect the acid waste liquid in the adipic acid production process and then flow the acid waste liquid into the central storage tank 11 for storage.

[0033] The sedimentation filter tank 12 is connected to the central liquid storage tank 11, and an ammonia water addition port is provided on the sedimentation filter tank 12. The acidic waste liquid stored in the sedimentation filter tank 12 is pumped into the sedimentation filter tank 12 by the power pump 24 for filtration and precipitation, and ammonia water can be added to the sedimentation filter tank 12 through the ammonia water addition port to adjust the pH value of the waste liquid to between 6.5 and 7.5, so that the ions form floccules for easy precipitation and filtration.

[0034] The inlet of the centrifuge 14 is connected to the filter outlet of the sedimentation filter tank 12, and the acidic waste liquid filtered by the sedimentation filter tank 12 is centrifugally separated into a dense phase part and a dilute phase part by the centrifuge 14. Among them, the dense phase part and the dilute phase part are liquids with different concentrations. The dense phase is a part with a relatively large concentration, mainly containing crystals, ion precipitation groups, catalysts, etc. The dilute phase is a part with a relatively small concentration, and also includes slightly dissolved aqueous solutions thrown out of the above parts.

[0035] The centrifuge 14 is provided with an acid inlet, a dilute phase outlet and a dense phase outlet, and the recovered HCl (hydrogen chloride) can be added into the centrifuge 14 through the acid inlet to acidify the acidic waste liquid. The dense phase separated in the centrifuge 14 flows out through the dense phase outlet, and the dilute phase flows out through the dilute phase outlet.

[0036] The first evaporator component 19 has a first waste liquid inlet, a first adipic acid crystal outlet and a first waste liquid outlet. The first waste liquid inlet is connected to the dense phase outlet of the centrifuge 14, and the dense phase separated in the centrifuge 14 is sent to the first evaporator component 19 for evaporation, thereby generating adipic acid crystals and waste liquid. Among them, the adipic acid crystals are discharged through the first adipic acid crystal outlet, and the waste liquid is discharged through the first waste liquid outlet.

[0037] The separation liquid storage tank 15 is connected to the dilute phase outlet of the centrifuge 14 to collect the dilute phase separated in the centrifuge 14. The separation liquid storage tank 15 is provided with a first liquid outlet and a second liquid outlet.

[0038] The cold mother liquid tank 16 is connected to the first liquid outlet of the separation liquid storage tank 15, and part of the dilute phase in the separation liquid storage tank 15 flows into the cold mother liquid tank 16 to replace the desalted water, thereby reducing the use of desalted water.

[0039] The wastewater treatment device of this embodiment recycles the acidic wastewater originally discharged into the sewage pool during the production of adipic acid. A part of the wastewater passes through the centrifuge 14 and is purified by the evaporator to purify the adipic acid crystals, and the remaining part flows into the cold mother liquor tank 16 to replace the desalted water, thereby reducing the use of desalted water. The use of desalted water is reduced, thereby realizing the recycling and reuse of the acidic wastewater generated in the production of adipic acid, which is more environmentally friendly.

[0040] In some embodiments, the structure of the sedimentation and filtration tank 12 is preferably an overflow tank, and a cooling water pipeline 25 for cooling the acidic wastewater is provided inside the overflow tank, and cooling water flows in the cooling water pipeline 25. The acidic waste liquid in the sedimentation and filtration tank 12 can exchange heat with the cooling water pipeline 25, thereby cooling the acidic waste liquid generated in the adipic acid production process online in real time.

[0041] Of course, in some other embodiments, the sedimentation and filtration tank 12 may also adopt other structural forms, and the cooling water pipeline 25 may also be replaced with other equipment with cooling function.

[0042] In some embodiments, Figure 2 As shown, the wastewater treatment device further includes a PP cotton core filter 13 , which is disposed in the sedimentation filter tank 12 and located at the filter outlet of the sedimentation filter tank 12 .

[0043] The PP cotton core filter 13 can perform cyclic filtration on the waste liquid to reduce the ion concentration in the waste liquid, ensure that the ion content in the recycled acidic waste liquid component meets the requirements, and reduce the impact on the subsequent recycling process. Preferably, the PP cotton core filter 13 is selected to be 2 microns.

[0044] like Figure 1 As shown, in some embodiments, the wastewater treatment device further includes an activated carbon filter 18, and the liquid inlet of the activated carbon filter 18 is connected to the second liquid outlet of the separation liquid storage tank 15 through a waste liquid pump 17. In this way, a part of the dilute phase part stored in the separation liquid storage tank 15 enters the cold mother liquid tank 16 for storage, replacing the desalted water, thereby reducing the amount of desalted water used. The other part can be pressurized into the activated carbon filter 18 through the waste liquid pump 17, thereby flushing the activated carbon filter 18. Acidic waste liquid can replace the activated carbon cleaning liquid to flush the activated carbon.

[0045] like Figure 1 As shown, in some embodiments, the wastewater treatment device further includes a resin reactor assembly 20 , a catalyst solution tank 21 and a concentration tower 22 .

[0046] The resin reactor assembly 20 has a reactor waste liquid inlet, a reactor waste liquid outlet and a reactor catalyst liquid outlet. The first waste liquid outlet of the first evaporator assembly 19 is connected to the reactor waste liquid inlet, and the reactor catalyst liquid outlet is connected to the catalyst solution tank 21.

[0047] The resin reactor assembly 20 of this embodiment includes a reactor feed tank 200 and a resin reactor 201 connected in sequence, the inlet of the reactor feed tank 200 forms the reactor waste liquid inlet of the resin reactor assembly 20, and the outlet of the resin reactor 201 forms the reactor catalyst liquid outlet of the resin reactor assembly 20.

[0048] The waste liquid discharged from the first evaporator assembly 19 first flows into the reactor feed tank 200 for buffering, and then flows into the resin reactor 201 for reaction to recover the catalyst used in the caprolactam generation process, and the recovered catalyst is sent to the catalyst solution tank 21, and then sent to the concentration tower 22 for recycling.

[0049] The wastewater treatment device of the present embodiment further comprises a second evaporator assembly 23, wherein the second evaporator assembly 23 has a second waste liquid inlet and a second adipic acid crystal outlet.

[0050] The reactor waste liquid outlet of the resin reactor assembly 20 is connected to the second waste liquid inlet of the second evaporator assembly 23. The waste liquid remaining after the reaction in the resin reactor assembly 20 is sent to the second evaporator assembly 23 for evaporation again, so as to obtain adipic acid crystals again and discharge them through the second adipic acid crystal outlet.

[0051] It should be noted that the second evaporator assembly 23 of the present embodiment includes an evaporator feed tank 230 and an evaporator body 231, the liquid inlet of the evaporator feed tank 230 forms the second waste liquid inlet of the second evaporator assembly 23, and the adipic acid crystallization outlet of the evaporator body 231 forms the second adipic acid crystallization outlet of the second evaporator assembly 23. As for the first evaporator assembly 19, it can only include the evaporator body.

[0052] An embodiment of the utility model further provides an adipic acid production system, which includes a wastewater treatment device in an adipic acid production process as described in any of the above embodiments.

[0053] The above description is intended to be illustrative rather than restrictive, and those skilled in the art may make changes, modifications, substitutions and variations to the above embodiments within the scope of the present disclosure. Moreover, the above examples (or one or more of them) may be used in combination with each other, and it is contemplated that these embodiments may be combined with each other in various combinations or permutations.

Claims

1. A wastewater treatment device in adipic acid production process, characterized in that: The wastewater treatment device comprises: A central liquid storage tank, which is used to store acidic wastewater generated during the production of adipic acid; A sedimentation and filtration tank connected to the central liquid storage tank, wherein an ammonia water inlet is provided on the sedimentation and filtration tank; A centrifuge connected to the filter outlet of the sedimentation filter tank, wherein the centrifuge is provided with an acid solution inlet, a dilute phase outlet and a dense phase outlet; a first evaporator assembly having a first waste liquid inlet, a first adipic acid crystallization outlet, and a first waste liquid outlet, wherein the first waste liquid inlet is connected to the dense phase outlet of the centrifuge; A separation liquid storage tank connected to the dilute phase outlet of the centrifuge, the separation liquid storage tank having a first liquid outlet; The cold mother liquid tank is connected to the first liquid outlet of the separation liquid storage tank.

2. The wastewater treatment device in the adipic acid production process according to claim 1, characterized in that: A cooling component for cooling the acidic wastewater is arranged in the sedimentation and filtration tank.

3. The wastewater treatment device in the adipic acid production process according to claim 2, characterized in that: The cooling component is a cooling water pipeline.

4. The wastewater treatment device in the adipic acid production process according to claim 2, characterized in that: The sedimentation and filtration tank is an overflow tank.

5. The wastewater treatment device in the adipic acid production process according to claim 1, characterized in that: The wastewater treatment device also includes a PP cotton core filter, which is arranged in the sedimentation filter tank and located at the filter outlet of the sedimentation filter tank.

6. The wastewater treatment device in the adipic acid production process according to claim 1, characterized in that: The separation liquid storage tank has a second liquid outlet; the wastewater treatment device also includes an activated carbon filter, and the liquid inlet of the activated carbon filter is connected to the second liquid outlet of the separation liquid storage tank through a waste liquid pump.

7. The wastewater treatment device in the adipic acid production process according to claim 1, characterized in that: The wastewater treatment plant also includes a resin reactor assembly and a catalyst solution tank; The resin reactor assembly has a reactor waste liquid inlet, a reactor waste liquid outlet and a reactor catalyst liquid outlet. The first waste liquid outlet of the first evaporator assembly is connected to the reactor waste liquid inlet, and the reactor catalyst liquid outlet is connected to the catalyst solution tank.

8. The wastewater treatment device in the adipic acid production process according to claim 7, characterized in that: The wastewater treatment device further comprises a second evaporator component having a second waste liquid inlet, a second adipic acid crystallization outlet and a second waste liquid outlet, and the reactor waste liquid outlet is connected to the second waste liquid inlet of the second evaporator component.

9. An adipic acid production system, characterized in that: A wastewater treatment device for adipic acid production process comprising the device described in any one of claims 1 to 8.

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