A device and method for treating wastewater produced in the production of n-ethylpiperazine

Abstract

The application discloses a wastewater treatment device and method for N-ethylpiperazine production and relates to the technical field of multistage wastewater treatment. The device comprises a pH adjusting tank and a blow-off tower arranged in sequence. The pH adjusting tank is used for adjusting the pH of wastewater, so that the pH of the wastewater entering the blow-off tower reaches a blow-off value. The blow-off tower comprises a tower body, a filler bed, a detector and the like. The filler bed is located in the tower body and comprises a fixed bed and at least one movable bed above the fixed bed. The filler is accommodated on the upper surfaces of the fixed bed and the movable bed, so that the filler is arranged in a layered state. The wastewater treatment device and method for N-ethylpiperazine production can detect the occurrence of liquid flooding and quickly solve the liquid flooding problem, thereby avoiding the situation that the equipment cannot continuously work due to liquid flooding.

Description

Technical Field

[0001] This invention relates to the field of multi-stage wastewater treatment technology, specifically to a wastewater treatment device and method for the production of N-ethylpiperazine. Background Technology

[0002] The production of N-ethylpiperazine generates a large amount of wastewater. The general treatment process is as follows: equalization tank → neutralization / coagulation → anaerobic reactor → aerobic MBR → Fenton oxidation → nanofiltration → activated carbon adsorption.

[0003] However, in actual production, the characteristics of the water quality should also be taken into account, such as high nitrogen content, organic pollutants, possible alkalinity or solvent residues. For high ammonia nitrogen wastewater generated during the production of N-ethylpiperazine, it is best to add a stripping tower (to strip ammonia when pH>10).

[0004] Ammonia nitrogen stripping reaction (requires alkaline conditions): NH4+ + OH- - →NH3↑+H2ONH4+ +OH - →NH3↑+H2O, ammonia (NH3) is carried away by the air, and the concentration of ammonia nitrogen in the remaining water is significantly reduced.

[0005] Typical stripping towers require packing material to increase the contact time and contact area between the gas and liquid phases, thereby ensuring the cleanliness of wastewater treatment. Packing material can be divided into high-density packing material and low-density packing material.

[0006] High-density packing materials, with their high specific surface area and porosity, can provide a larger gas-liquid contact area, significantly improving mass transfer efficiency. Examples include small-sized packing balls and Pall rings. However, high-density packing materials increase the resistance to gas flow, leading to increased pressure drop and potentially causing flooding (e.g., a decrease in gas velocity at the flooding point). Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides a wastewater treatment device and method for the production of N-ethylpiperazine, which solves the problem that high-density packing in existing technologies increases the resistance to gas flow, leading to increased pressure drop and potentially causing flooding.

[0008] To achieve the above objectives, the present invention is implemented through the following technical solution: a wastewater treatment device for the production of N-ethylpiperazine, comprising a pH adjustment tank and a stripping tower arranged in sequence, wherein the pH adjustment tank is used to adjust the pH of the wastewater so that the pH of the wastewater entering the stripping tower reaches the stripping value;

[0009] The blowdown tower includes:

[0010] tower body;

[0011] The filler bed is located in the tower body, and the filler bed comprises a fixed bed and at least one movable bed above the fixed bed, and the filler is arranged on the upper surface of the fixed bed and the movable bed to form a single filler bed.

[0012] The detector is located on the inner wall of the tower body, and the detector is located above the uppermost movable bed of the filler bed to detect whether flooding occurs.

[0013] The lifting mechanism is arranged on the tower body to lift the movable bed, expand the axial gap of the filler, reduce the pressure drop of the filler, and enable the flooding liquid to flow downward through the filler.

[0014] Further, each filler bed comprises two movable beds arranged in parallel above and below, and the lifting mechanism comprises a lifting rod which can change the distance between the two movable beds relative to the fixed bed.

[0015] Further, the lower end of the lifting rod is rotatably assembled at the center of the movable bed;

[0016] The movable bed comprises a center ball concentric with the tower body, the center ball is provided with a through hole at the center, the through hole is provided with a sliding block, and the lifting rod is provided with a spiral groove matched with the sliding block;

[0017] The spiral height of the spiral groove above the same lifting rod is greater than the spiral height of the spiral groove below the same lifting rod;

[0018] The rotation of the lifting rod can drive the two movable beds to move along the axial direction of the tower body through the spiral groove and the sliding block.

[0019] Further, the lower end of the lifting rod is fixed on the lower center ball, the upper end of the lifting rod passes through the upper center ball and can slide relative to the upper center ball, the upper end of the lifting rod is fixedly provided with a top plate, and a height is reserved between the top plate and the upper center ball;

[0020] The upper center ball can be lifted to the height of the top plate by the lifting rod.

[0021] Further, the lifting mechanism further comprises an I-shaped steel, the I-shaped steel is fixedly arranged above the tower body and above the filler bed, springs are arranged between the I-shaped steel and the upper center ball, and springs are arranged between the upper center ball and the lower center ball.

[0022] Further, the lifting mechanism further comprises a driving shaft, the driving shaft is arranged above the filler bed and arranged along the diameter direction of the tower body, a winding wheel is arranged on the driving shaft and opposite to the center ball, a lifting rope is connected between the winding wheel and the upper center ball, and the rotation of the driving shaft can make the winding wheel wind or unwind the lifting rope.

[0023] Further, the active bed further comprises:

[0024] The spokes are radially installed on the central ball through a pin shaft, and a torsional spring is arranged between the pin shaft and the central ball.

[0025] The net-shaped bed plate is in a fan-shaped structure, is located between two spokes, and one side of the net-shaped bed plate is fixedly connected with an adjacent spoke.

[0026] The inner wall of the tower body is provided with a ridge at a position corresponding to the rising interval of the active bed, and the active bed can vibrate when the resistance of the ridge is overcome during axial movement of the tower body, so as to adjust the gap of the packing in the radial direction of the tower body.

[0027] Further, the packing bed is provided with a water distributor above the packing bed, the height of the water distributor is greater than the height of the detector, and the height of the water distributor is greater than the rising height of the active bed.

[0028] The tower body is provided with a water outlet below one side of the tower body.

[0029] Further, the tower body is provided with an air inlet below the side of the tower body away from the water outlet, the tower body is provided with a water trap at the upper end of the tower body, and the tower body is provided with an air outlet above the water trap.

[0030] On the other hand, the application also provides a wastewater treatment method for N-ethylpiperazine production, which uses the above-mentioned wastewater treatment device for N-ethylpiperazine production to treat, comprising the following steps:

[0031] Step one: add alkali to the wastewater in the pH adjusting tank to make the pH of the wastewater > 10;

[0032] Step two: pass the alkalized wastewater into the above-mentioned stripping tower to strip NH3 in the wastewater;

[0033] Step three: pass the liquid obtained in step two into the pH neutralization tank, the precipitation tank and the biological treatment tower in sequence, and finally discharge the water.

[0034] The application has the following beneficial effects:

[0035] (1) The wastewater treatment device and method for N-ethylpiperazine production can detect the occurrence of liquid flooding and quickly solve the problem of liquid flooding, so as to avoid the situation that the equipment cannot continuously work due to liquid flooding.

[0036] (2) The wastewater treatment device and method for N-ethylpiperazine production can vibrate when the packing moves axially, the gap of the packing in the radial direction of the tower body is adjusted, and the subsequent continuous liquid flooding is avoided.

[0037] Of course, it is not necessary for any product embodying the invention to achieve all of the above-mentioned advantages simultaneously. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 is a structural diagram of the present invention;

[0039] Figure 2 is a diagram of the internal structure of the stripping tower of the present invention;

[0040] Figure 3 is a front view of the present invention; Figure 2

[0041] Figure 4 is an assembly diagram of the lifting mechanism and the packing bed of the present invention;

[0042] Figure 5 is an exploded view of the present invention; Figure 4

[0043] Figure 6 is an exploded view of the movable bed of the present invention;

[0044] Figure 7 is an enlarged view of area A of the present invention; Figure 6

[0045] is a diagram of the state in which the packing bed of the present invention is pressed into an umbrella shape by the movable bed; Figure 8

[0046] is a diagram of the position of the ridge of the present invention; Figure 9

[0047] is another view of the stripping tower of the first embodiment of the present invention; Figure 10

[0048] is a diagram in which the driving structure of the present invention is exposed; Figure 11 Figure 10 is an assembly diagram of the lifting mechanism and the packing bed of the second embodiment of the present invention;

[0049] Figure 12 is an enlarged view of area B of the present invention;

[0050] Figure 13 Figure 12 is a partial front view of the present invention.

[0051] Figure 14 Figure 12

[0052] ​​​​​​In the figure, 100, pH adjusting tank; 1, circulating buffer tank; 11, wastewater inlet; 12, clean water outlet; 2, circulating pump; 3, ridge; 4, tower body; 41, air inlet; 42, manhole; 43, exhaust port; 44, conical head; 45, external connector; 46, drain port; 5, filler bed; 51, fixed bed; 52, movable bed; 521, mesh bed plate; 522, spoke; 523, center ball; 524, sliding block; 525, assembly groove; 526, pin shaft; 527, assembly head; 6, liquid level sensor; 7, lifting mechanism; 71, driving structure; 72, lifting rod; 721, helical groove; 722, straight groove; 723, top plate; 73, driving shaft; 74, driving umbrella wheel; 75, driven umbrella wheel; 76, winding wheel; 77, spring; 78, I-beam; 79, lifting rope; 8, water distributor; 81, main pipe; 82, first level branch pipe; 83, second level branch pipe; 84, spray head; 9, support ridge; 10, water remover. DETAILED DESCRIPTION

[0053] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0054] In the description of the present application, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "periphery" and the like indicate the orientation or positional relationship, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the indicated component or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0055] The following is based on Figures 1-14 The device and method for treating wastewater produced in the production of N-ethylpiperazine are described.

[0056] Embodiment one, please refer to Figures 1-11 .

[0057] The device for treating wastewater produced in the production of N-ethylpiperazine provided by the embodiments of the present application comprises a pH adjusting tank 100 and a stripping tower arranged in sequence, the pH adjusting tank 100 is used for adjusting the pH of the wastewater, so that the pH of the wastewater entering the stripping tower reaches the stripping value;

[0058] The stripping tower comprises a tower body 4, a gas inlet 41 arranged below one side of the tower body 4 for introducing gas, a water outlet 46 arranged below the other side of the tower body 4, and a conical head 44 arranged at the top end of the tower body 4, wherein a water trap 10 is arranged at the lower end of the conical head 44, and a gas outlet 43 is arranged at the upper end of the conical head 44.

[0059] A filler bed 5 is arranged in the tower body 4, and in this embodiment, as shown in Figure 2 and Figure 3 three layers of filler beds 5 are arranged, and a water distributor 8 is arranged above each filler bed 5, so that the alkalized wastewater (the PH value of the wastewater needs to be greater than 10) is introduced from top to bottom through the water distributor 8 into the filler bed 5, and the gas passes through the filler bed 5 from bottom to top, and the gas and the liquid react in the filler, the generated ammonia gas rises, passes through the water trap 10, and is discharged from the gas outlet 43, and the discharged ammonia gas needs to be treated again before being discharged.

[0060] Preferably, a manhole 42 is arranged in the area of the tower body 4 opposite to the filler bed 5.

[0061] As shown in Figures 3-6 The filler bed 5 mentioned above is different from the prior art, and the filler bed 5 comprises a fixed bed 51 opposite to the tower body 4 and at least one movable bed 52 above the fixed bed 51, and the filler is arranged on the upper surfaces of the fixed bed 51 and the movable bed 52, i.e. the fixed bed 51, the movable bed 52 and the filler are filled with the filler, and the upper surface of the movable bed 52 is also filled with the filler, so that a single filler bed 5 has multiple layers of fillers, i.e. the fillers in a single filler bed 5 are arranged in layers.

[0062] The fillers are arranged in layers so that the fillers in each layer are separated once liquid flooding occurs during use, so as to expand the axial gap of the fillers in the tower body 4, and reduce the pressure drop of the fillers, so that the liquid can quickly flow through the fillers, and the equipment can continue to operate without being affected by the liquid flooding.

[0063] Preferably, the fillers in this embodiment are small-sized filler balls or Pall rings.

[0064] Therefore, a lifting mechanism 7 is arranged, the detector is arranged on the inner wall of the tower body 4 and is located higher than the uppermost movable bed 52 of the filler bed 5, and the lifting mechanism 7 is arranged on the tower body 4 and is used to lift the movable bed 52, expand the axial gap of the fillers, reduce the pressure drop of the fillers, and enable the liquid in liquid flooding to flow downward through the fillers.

[0065] Preferably, the detector is a liquid level sensor 6.

[0066] In use, once the detector detects that liquid flooding occurs above the corresponding filler bed 5, the controller controls the lifting mechanism 7 to work at this time, thereby adjusting the axial position of the movable bed 52, changing the axial spacing of each layer of filler, so that the filler becomes sparse in the axial direction, ensuring that the liquid can flow downward and the gas can flow upward.

[0067] Therefore, the wastewater treatment device for N-ethyl piperazine production provided by the embodiment of the present application can detect the occurrence of liquid flooding and quickly solve the problem of liquid flooding, avoiding the situation that the equipment cannot continue to work due to liquid flooding.

[0068] Preferably, the lifting mechanism 7 can maintain the height of the movable bed 52 fixed for a certain period of time after lifting, for example, 5 minutes, which can solve the problem of liquid flooding. The movable bed 52 is maintained at the lifting height for 5 minutes after being lifted. The specific maintenance time is determined by the diameter of the tower body 4.

[0069] Preferably, a support ridge 9 is arranged on the inner wall of the tower body 4 to fix the fixed bed 51 on the support ridge 9.

[0070] Combined Figures 3-7 As shown in the embodiment, two movable beds 52 are arranged above and below each filler bed 5, and the lifting mechanism 7 includes a lifting rod 72, the lower end of which is rotatably assembled at the center of the movable bed 52, that is, the lifting rod 72 is in a rotatable state. The movable bed 52 includes a center ball 523 concentric with the tower body 4, a through hole is formed in the center of the center ball 523, a sliding block 524 is arranged in the through hole, the lifting rod 72 is located in the through hole, and a spiral groove 721 adapted to the sliding block 524 is arranged on the lifting rod 72. When the lifting rod 72 rotates, the spiral groove 721 can push the sliding block 524 to move along the axial direction of the tower body 4, thereby moving the two movable beds 52 along the axial direction of the tower body 4 and separating the filler layers.

[0071] Preferably, the spiral height of the spiral groove 721 above the same lifting rod 72 is greater than the spiral height of the spiral groove 721 below, so that the upward distance of the spiral groove 721 above pushing the movable bed 52 above is greater than the upward distance of the spiral groove 721 below pushing the movable bed 52 below, thereby realizing the separation of each bed layer on the same filler bed 5.

[0072] Furthermore, the lifting mechanism 7 further includes a driving shaft 73 arranged above the filler bed 5 along the radial direction of the tower body 4, and a driving structure 71 for driving the driving shaft 73 to rotate is arranged outside the tower body 4, the driving structure 71 is composed of a motor and a gear, a driving umbrella wheel 74 is installed on the driving shaft 73, and a driven umbrella wheel 75 is installed on the upper end of the lifting rod 72, thereby realizing the rotation of the lifting rod 72.

[0073] Preferably, the outer joint 45 is arranged on the side wall of the tower body 4 opposite to the driving shaft 73, the driving shaft 73 passes through the outer joint 45, and a plug is further arranged in the outer joint 45 to block the outer joint 45, and the driving shaft 73 passes through the plug.

[0074] As shown in Figures 4-7 , in the above scheme, the purpose of adjusting the axial gap of the packing in the tower body 4 is achieved, but the packing can only be temporarily separated in the axial direction, and the movable beds 52 need to be reset downward after the liquid flooding problem is solved. In order to reduce the probability of liquid flooding again after resetting, it is better to rearrange the packing on the movable bed 52, which can avoid the situation of repeated liquid flooding caused by the excessive arrangement density of the packing due to the pressure drop of the packing. Therefore, the movable bed 52 further comprises spokes 522 and a mesh bed plate 521.

[0075] Specifically, the spokes 522 are radially rotatably arranged on the central ball 523 through the pin shaft 526. Six spokes 522 are arranged in the figure. The end of the spoke 522 close to the central ball 523 is fixedly provided with an assembly head 527. An assembly groove 525 is formed outside the central ball 523. The assembly head 527 is fixed on the pin shaft 526. The two ends of the pin shaft 526 are inserted into the inner wall of the assembly groove 525, and a torsional spring is arranged between the pin shaft 526 and the side wall of the assembly groove 525. In the embodiment, the spoke 522 has a certain degree of freedom along the circumference of the pin shaft 526. Preferably, the position of the spoke 522 is limited to being able to rotate upward by 2° and downward by 2°, that is, the overall freedom of the spoke 522 is 4°.

[0076] In addition, the mesh bed plate 521 has a fan-shaped structure, so that the gas and liquid can pass through, and the mesh bed plate 521 is located between two spokes 522, and one side of the mesh bed plate 521 is fixedly connected with an adjacent spoke 522. A ridge 3 is arranged on the inner wall of the tower body 4 corresponding to the rising interval of the movable bed 52, as shown in Figure 9 ; preferably, the ridge 3 has a ring structure.

[0077] In the embodiment, when the lifting rod 72 rotates and lifts the movable bed 52 upward, the mesh bed plate 521 and the spoke 522 pass through the ridge 3. When passing through the ridge 3, the spoke 522 and the mesh bed plate 521 are pushed, so that they are deflected downward. When passing through the ridge 3, the spoke 522 and the mesh bed plate 521 return to the original state due to the resetting action of the torsional spring. As the spoke 522 and the mesh bed plate 521 pass through multiple ridges 3, the mesh bed plate 521 and the spoke 522 form a vibrating state. This vibration can make the packing vibrate, so that the radial gap of the packing in the tower body 4 is adjusted, and the subsequent continuous liquid flooding situation is avoided.

[0078] Therefore, the embodiments of the present invention can vibrate when the packing moves axially, and the gap of the packing along the radial direction of the tower body 4 is adjusted to avoid subsequent continuous flooding.

[0079] In essence, due to the weight of the packing material on the mesh bed plate 521, the mesh bed plate 521 and spokes 522 are in a slightly downward-biased state even when not lifted, meaning the entire movable bed 52 is essentially an umbrella-shaped structure. Figure 8 In order to prevent the mesh bed 521 and spokes 522 from being excessively deflected downwards by the packing material in their natural state, the ridge 3 can also serve to support the edges of the mesh bed 521 and spokes 522.

[0080] Reference Figures 2-5 As shown, in order to ensure that the alkalized wastewater can be sprayed evenly onto the packing bed 5, a water distributor 8 is provided above the packing bed 5. The height of the water distributor 8 is greater than the height of the detector, and the height of the water distributor 8 is greater than the rising height of the movable bed 52.

[0081] Specifically, the water distributor 8 includes a main pipe 81, primary branch pipes 82 located on both sides above the packing bed 5, secondary branch pipes 83 located on both sides of the primary branch pipes 82, and nozzles 84 located below the primary branch pipes 82 and the secondary branch pipes 83. A wastewater inlet 11 is provided on the main pipe 81 for alkaline waste liquid to enter the water distributor 8.

[0082] Preferably, two secondary branch pipes 83 are passed through the tower body 4 via external connectors 45, and the main pipe 81 is located outside the tower body 4 and is connected to the primary branch pipe 82; in addition, a plug is also required inside the external connector 45 to seal the external connector 45, and the primary branch pipe 82 passes through the plug.

[0083] Combination Figure 10 and Figure 11 As shown, a drain outlet 46 is provided on one side of the tower body 4 to discharge the water after the reaction. In actual use, in order to better treat the wastewater, a circulating buffer tank 1 is generally also provided. The circulating buffer tank 1 is connected to the drain outlet 46. A circulating pump 2 is also connected to the circulating buffer tank 1. The outlet of the circulating pump 2 is connected to the main pipe 81, so that the water discharged from the drain outlet 46 can be distributed back into the packing bed 5 by the water distributor 8 through the circulating pump 2. A clean water outlet 12 is also provided above the circulating buffer tank 1.

[0084] During use (operation), gas enters through inlet 41, and alkalized wastewater enters water distributor 8 through wastewater inlet 11. It is then evenly distributed on the packing bed 5 by water distributor 8. Gas and liquid react in the packing to generate ammonia. Air and ammonia are dehydrated by dewatering device 10 and discharged through exhaust port 43. The treated water enters the recirculation buffer tank 1 and is then pumped back to water distributor 8 by circulation pump 2. Clean water outlet 12 is used to discharge clean water with a high liquid level in the recirculation buffer tank 1.

[0085] After the water distributor 8 distributes water, once the flooding phenomenon occurs above the packing bed 5, the detector can detect it, at this time the controller controls the driving structure 71 to work, so that the driving shaft 73, the driving umbrella wheel 74, the driven umbrella wheel 75 drive the lifting rod 72 to rotate, when the lifting rod 72 rotates, the spiral groove 721 can push the sliding block 524 to move along the axial direction of the tower body 4, so that the two movable beds 52 move along the axial direction of the tower body 4, so that the packing in each layer is separated, and the movable bed 52 reaches the set height and maintains this height for a period of time, and the controller controls the lifting rod 72 to rotate reversely, so that the movable bed 52 is reset downward, and in the process of moving up and down, the convex ridge 3 can make the movable bed 52 vibrate, so as to rearrange the packing.

[0086] Embodiment two, this embodiment refers to Figures 12-14 .

[0087] The difference between this embodiment and embodiment one is that the lower end of the lifting rod 72 is fixed on the lower central ball 523, the upper end of the lifting rod 72 penetrates through the upper central ball 523 and can slide relative to the upper central ball 523, the upper end of the lifting rod 72 is fixedly provided with a top plate 723, and a certain height is reserved between the top plate 723 and the upper central ball 523.

[0088] After the upper central ball 523 is lifted to the height of the top plate 723, the lower central ball 523 can be lifted by the lifting rod 72, so that the distance between the lower movable bed 52 and the fixed bed 51 can be adjusted, and the distance between the lower movable bed 52 and the upper movable bed 52 can also be adjusted.

[0089] Specifically, the lifting mechanism 7 also includes an I-shaped steel 78, the I-shaped steel 78 is fixedly arranged above the tower body 4 and above the packing bed 5, springs 77 are arranged between the I-shaped steel 78 and the upper central ball 523, and springs 77 are arranged between the upper central ball 523 and the lower central ball 523, the two springs 77 are used to rebound when the lifting rod 72 no longer lifts the movable bed 52 below, so that the movable bed 52 is reset downward.

[0090] And in order to realize the above-mentioned lifting rod 72 rises, falls, here the lifting mechanism 7 also includes the driving shaft 73, the driving shaft 73 is located above the filler bed 5, and is arranged along the diameter direction of the tower body 4, the driving shaft 73 is provided with a winding wheel 76 in the area opposite to the center ball 523, the winding wheel 76 is connected with the center ball 523 above by a lifting rope 79, the driving shaft 73 rotates can make the winding wheel 76 to the lifting rope 79 winding or unwinding, when the winding wheel 76 rotates forward, the lifting rope 79 is wound, it first lifts the upper movable bed 52 upwards, when the upper center ball 523 reaches the position of the top plate 723 upwards, the top plate 723 can be dragged to move upwards, thereby driving the lower movable bed 52 to move upwards through the lifting rod 72.

[0091] Preferably, a straight groove 722 is arranged at the position close to the upper part of the lifting rod 72, and a sliding block 524 is arranged in the upper center ball 523, for guiding the movement of the upper center ball 523.

[0092] In use (when working), similar to the first embodiment, the difference is that after the detector detects the flooding phenomenon, the controller controls the driving structure 71 to work, thereby driving the winding wheel 76 to rotate through the driving shaft 73, the winding wheel 76 rotates can wind the lifting rope 79, so that the lifting rope 79 can lift the upper movable bed 52 upwards, and compress the upper spring 77, and stretch the lower spring 77, when the upper center ball 523 reaches the position of the top plate 723 upwards, the top plate 723 can be dragged to move upwards, thereby driving the lower movable bed 52 to move upwards through the lifting rod 72, and when reaching the specified position, due to the sparse arrangement of the filler, the flooding problem can be solved.

[0093] In the second aspect, the present application also provides a wastewater treatment method for N-ethylpiperazine production, which uses the above-mentioned wastewater treatment device for N-ethylpiperazine production to treat, which includes the following steps:

[0094] Step one: add alkali to the wastewater in the pH adjusting tank 100, so that the pH of the wastewater is greater than 10;

[0095] Step two: pass the alkalized wastewater into the above-mentioned stripping tower to strip, remove NH3 in the wastewater;

[0096] Step three: pass the liquid obtained in step two into the pH neutralization tank, the sedimentation tank and the biological treatment tower in sequence, and finally discharge water, neutralize the residual alkali (OH - ) in the wastewater after stripping in the pH neutralization tank, add flocculants in the sedimentation tank to remove colloidal organic matter (such as part of the undegraded ethylpiperazine polymer) and suspended solids, and the biological treatment tower treats soluble organic matter (such as residual ethylpiperazine, intermediate product acetic acid, amine), residual ammonia nitrogen (NH4 + , usually <100 mg / L).

[0097] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting; it is not intended to exclude myriad other embodiments of the present application that other presenters can develop. That is, although specific embodiments of the application can have been described herein, the scope of the application is not limited to the specific embodiments described herein. Rather, a variety of modifications of the described embodiments can be made by those skilled in the art without departing from the scope of the present application. Accordingly, the scope of the present application is defined only by the following claims and equivalents thereof.

[0098] The preferred embodiments of the application disclosed above are only for helping to explain the present application. The preferred embodiments do not describe all the details of the present application, nor limit the present application to the specific embodiments described. Obviously, many modifications and variations of the present application can be made in light of the teachings above. The present application is selected and described above for better explaining the principles and practical application of the present application, so that those skilled in the art can well understand and utilize the present application. The present application is limited only by the following claims and their full scope and equivalents.

Claims

1. An apparatus for treating waste water produced in the production of N- ethylpiperazine, characterized by The pH adjusting tank (100) is used for adjusting the pH of the wastewater, so that the pH of the wastewater entering the blow-off tower reaches the blow-off value. The blow-off tower comprises: a tower body (4); a filler bed (5) located in the tower body (4), wherein the filler bed (5) comprises a fixed bed (51) opposite to the tower body (4) and two upper and lower movable beds (52) arranged side by side above the fixed bed (51), the fillers are arranged on the upper surfaces of the fixed bed (51) and the movable beds (52) to form a single filler bed (5) in a layered arrangement state, and the movable bed (52) comprises a central ball (523) concentric with the tower body (4); a detector located on the inner wall of the tower body (4) and positioned higher than the uppermost movable bed (52) of the filler bed (5) to detect whether the liquid flooding phenomenon occurs; a lifting mechanism (7) arranged on the tower body (4) to lift the movable bed (52), expand the axial gap of the fillers, reduce the pressure drop of the fillers, and enable the liquid flooding to flow downward through the fillers; the movable bed (52) further comprises: spokes (522) rotationally installed on the central ball (523) through pin shafts (526) in a radial manner, and torsional springs are arranged between the pin shafts (526) and the central ball (523); a mesh bed plate (521) in a fan-shaped structure, wherein the mesh bed plate (521) is located between two adjacent spokes (522) and is fixedly connected to one of the adjacent spokes (522) on one side thereof; a ridge (3) is arranged on the inner wall of the tower body (4) at a position corresponding to the lifting interval of the movable bed (52), and the movable bed (52) can vibrate when the movable bed (52) moves axially along the tower body (4) to generate resistance against the ridge (3), so as to adjust the radial gap of the fillers along the tower body (4); the lifting mechanism (7) comprises a lifting rod (72) capable of changing the distance between the two movable beds (52) relative to the fixed bed (51); the lower end of the lifting rod (72) is rotationally assembled at the center of the movable bed (52); a through hole is arranged at the center of the central ball (523), and a sliding block (524) is arranged in the through hole; a helical groove (721) is arranged on the lifting rod (72) and matched with the sliding block (524); the helical height of the helical groove (721) above the same lifting rod (72) is greater than the helical height of the helical groove (721) below the same lifting rod (72); 2. The apparatus for treating wastewater from N-ethylpiperazine production according to claim 1, characterized by: the rotation of the lifting rod (72) can drive the two movable beds (52) to move axially along the tower body (4) through the helical groove (721) and the sliding block (524). the lower end of the lifting rod (72) is fixed on the lower central ball (523), the upper end of the lifting rod (72) penetrates through the upper central ball (523) and can slide relative to the upper central ball (523), a top plate (723) is fixedly arranged on the upper end of the lifting rod (72), and a reserved height is arranged between the top plate (723) and the upper central ball (523). The upper center ball (523) is lifted to the height of the top plate (723) and can lift the lower center ball (523) through the lifting rod (72).

3. The apparatus for treating wastewater from N-ethylpiperazine production according to claim 2, characterized by: The lifting mechanism (7) further comprises an I-beam (78) which is fixed above the tower body (4) and above the filler bed (5), a spring (77) is arranged between the I-beam (78) and the upper center ball (523), and a spring (77) is arranged between the upper center ball (523) and the lower center ball (523).

4. The apparatus for treating wastewater from N-ethylpiperazine production according to claim 3, characterized by: The lifting mechanism (7) further comprises a driving shaft (73) which is arranged above the filler bed (5) and along the diameter direction of the tower body (4), a winding wheel (76) is arranged on the driving shaft (73) at a position opposite to the center ball (523), a lifting rope (79) is connected between the winding wheel (76) and the upper center ball (523), and the rotation of the driving shaft (73) can wind or unwind the lifting rope (79).

5. The apparatus for treating wastewater from N-ethylpiperazine production according to claim 4, characterized by: The upper part of the filler bed (5) is provided with a water distributor (8), the height of the water distributor (8) is greater than the height of the detector, and the height of the water distributor (8) is greater than the rising height of the movable bed (52). The lower part of one side of the tower body (4) is provided with a water outlet (46).

6. The apparatus for treating wastewater from N-ethylpiperazine production according to claim 5, characterized by: The lower part of the side of the tower body (4) away from the water outlet (46) is provided with an air inlet (41), the upper end of the tower body (4) is provided with a water remover (10), and the upper part of the water remover (10) is provided with an air outlet (43).

7. A method for treating wastewater produced in the production of N-ethylpiperazine, characterized by using the wastewater treatment apparatus for the production of N-ethylpiperazine according to any one of claims 1 to 6 to treat wastewater produced in the production of N-ethylpiperazine. The method comprises the following steps: Step one: add alkali to the wastewater in the pH adjusting tank (100) to make the pH of the wastewater greater than 10; Step two: pass the alkalized wastewater into the stripping tower for stripping to remove NH3 in the wastewater; Step three: pass the liquid obtained in step two into the pH neutralization tank, the precipitation tank and the biological treatment tower in sequence, and finally discharge the wastewater.

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