Vinylene carbonate production wastewater treatment system and treatment method

Abstract

The invention relates to the technical field of wastewater treatment, in particular to a vinylene carbonate production wastewater treatment system and method. Comprising a neutralizing tower and a bracket at the bottom of the neutralizing tower, a liquid inlet joint is arranged at the top of the neutralizing tower, and a liquid outlet joint is arranged at the bottom of the neutralizing tower; a through groove is outwards formed in the upper position of the inner wall of the neutralizing tower; an annular avoiding shell is tightened on the outer wall of the neutralizing tower through a first bolt; the avoiding shell can shield the through groove; an upper hole disc is fixedly connected to the inner wall of the neutralizing tower and is positioned above the through groove; a lower hole disc is movably connected to the inner wall of the neutralizing tower and is positioned below the through groove; according to the invention, the lower hole disc changes along with the change of the inlet amount of the wastewater in the neutralizing tower, so that the height of a neutralizing material in the neutralizing tower can adaptively change along with the change of the amount of the wastewater, and the wastewater flowing efficiency is improved while the neutralizing effect of the wastewater is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment, and specifically to a treatment system and method for the wastewater produced in the production of vinylene carbonate. Background Art

[0002] Vinylene carbonate is an additive for lithium battery electrolytes. Chlorinated ethylene carbonate undergoes a dechlorination reaction under alkaline conditions (in the presence of triethylamine) to produce vinylene carbonate and hydrogen chloride. Among them, triethylamine participates in the reaction as a base and combines with hydrogen chloride to form triethylamine hydrochloride. After adding alkali to triethylamine hydrochloride and evaporating, most of the triethylamine is distilled out, and a large amount of sodium chloride is thus generated in the water body, and there is also some unevaporated triethylamine. This high-temperature and strongly alkaline evaporation residue after recovering triethylamine is the wastewater to be treated in this technology. The main component of the wastewater is sodium chloride, and it also contains residual triethylamine, triethylamine hydrochloride, as well as other organic substances and salts introduced during the production process. Triethylamine has biological toxicity and will cause harm to aquatic organisms and the ecological environment. At the same time, the organic substances in the wastewater may have the characteristics of high stability and being difficult to biodegrade, increasing the difficulty of wastewater treatment. The current treatment process for this wastewater is mainly the combined process of MVR evaporation desalination and biochemical treatment. Evaporation can remove salts, and the evaporation condensate enters biochemical treatment. The disadvantages are that the evaporation water volume is large, the energy consumption is high, the crystalline salt is a hazardous waste and cannot be recycled, the biodegradability of the evaporated water is poor, and the biochemical effect is not ideal.

[0003] The first step in the treatment of the wastewater produced in the production of vinylene carbonate is to neutralize the wastewater and adjust the water quality and quantity. The neutralization of the wastewater is divided into two types according to the process: a dosing neutralization tank and a filtration neutralization tank. The dosing neutralization method is to add alkaline or acidic agents before the wastewater enters the neutralization tank so that the acidic wastewater or alkaline wastewater is homogenously mixed with the agents in the tank and then undergoes a neutralization reaction treatment. The filtration neutralization method is to fill the tank with filter materials with neutralization properties so that the acidic wastewater is neutralized when passing through the filter materials. Sometimes, the alkaline wastewater and the acidic wastewater are directly mixed in the tank for neutralization treatment. The advantages of the filtration neutralization tank are that it is easy to operate, does not require manual dosing, reduces labor intensity; the cost is relatively low, saving the costs related to agents, the reaction is rapid, and it can quickly achieve a good neutralization effect; the effluent water quality is stable, which is beneficial to the operation of subsequent processes, and thus it has been widely used.

[0004] After the filter materials in the filtration neutralization tank come into contact with the wastewater, the neutralization of the wastewater is realized. In the process of treating wastewater in a traditional filtration neutralization tank, there is generally a problem of fixed filter material dosage. When the wastewater volume changes, if the wastewater volume is large, the fixed filter materials are difficult to fully contact with the wastewater and complete the neutralization reaction, resulting in the effluent water quality not meeting the standards and being unable to meet the discharge or subsequent treatment requirements; while when the wastewater volume is small, a large amount of filter materials are still used, which not only causes waste of filter material resources, but also increases the filtration resistance, leading to an increase in energy consumption, treatment cost, and is not conducive to the efficient operation and long-term maintenance of the equipment. Summary of the Invention

[0005] To make up for the deficiencies of the prior art, the present invention proposes a treatment system and method for wastewater from the production of vinylene carbonate. In the present invention, the lower orifice plate in the neutralization tower changes with the inflow of wastewater, so that the height of the neutralization material in the neutralization tower can adapt to the change in the amount of wastewater, thereby ensuring the neutralization effect of the wastewater while improving the wastewater flow efficiency.

[0006] The technical solution adopted by the present invention to solve its technical problems is as follows: A treatment system for wastewater from the production of vinylene carbonate according to the present invention includes a neutralization tower and a bracket at the bottom of the neutralization tower; a liquid inlet joint is provided at the top of the neutralization tower, and a liquid outlet joint is provided at the bottom of the neutralization tower; a through groove is provided on the outer side of the inner wall of the neutralization tower at a position close to the upper part; a ring-shaped avoidance shell is tightened to the outer wall of the neutralization tower by a first bolt; the avoidance shell can block the through groove; an upper orifice plate is fixedly connected to the inner wall of the neutralization tower and above the through groove; a lower orifice plate is movably connected to the inner wall of the neutralization tower and below the through groove; a first spring is provided between the lower surface of the lower orifice plate and the inner bottom wall of the neutralization tower; a plurality of folding sleeves are provided between the upper orifice plate and the lower orifice plate; the plurality of folding sleeves are movably and hermetically connected to each other; the innermost folding sleeve is connected upward through the upper orifice plate, and the lower end of the outermost folding sleeve is fixedly sealed to the lower orifice plate; a neutralization material is filled between the upper orifice plate and the lower orifice plate.

[0007] Preferably, a chute is provided along the radial direction on the upper inner wall of the avoidance shell; a slider is slidably connected in the chute; a second spring is connected between the side of the slider away from the folding sleeve and the end of the chute away from the folding sleeve; an arc-shaped avoidance plate is connected to the lower surface of the slider.

[0008] Preferably, the upper end of the avoidance plate is rotatably connected to the slider through a torsion spring; adjacent avoidance plates on the inner circumference of the avoidance shell overlap each other.

[0009] Preferably, an upper spring seat is rotatably connected to the center of the lower surface of the lower orifice plate; the upper end of the first spring is fixedly connected to the upper spring seat, and the lower end is fixedly connected to the lower spring seat; a second bolt is provided through the lower spring seat downward; the second bolt is threadedly and hermetically connected to the neutralization tower.

[0010] Preferably, a spiral groove is provided on the inner wall of the folding sleeve; a movable block is movably and hermetically connected in the spiral groove; the movable block is fixedly connected to the outer wall of the corresponding folding sleeve; adjacent folding sleeves are hermetically connected by spiral transmission.

[0011] Preferably, an elastic spiral plate is provided between the upper orifice plate and the lower orifice plate; the lower end of the spiral plate is fixedly connected to the upper surface of the lower orifice plate; through holes are provided on the spiral plate.

[0012] Preferably, three-edge strips are arranged along the radial direction on the lower surface of the upper hole plate; a plurality of the three-edge strips are evenly distributed around the center of the upper hole plate; the upper end of the spiral plate is connected to a vertical rod.

[0013] Preferably, the specifications of the three-edge strips increase as they are farther away from the center of the upper hole plate; an adjustment groove is arranged on the outer wall of the vertical rod; the upper end of the spiral plate is clamped into the adjustment groove; a third bolt is threadedly connected through the adjustment groove downward.

[0014] A method for treating wastewater from vinylidene carbonate production, which is applicable to the above-mentioned wastewater treatment system for vinylidene carbonate production, and the steps of this method are as follows:

[0015] S1. Pretreatment: The wastewater is first cooled to about 25°C through a heat exchanger and then enters a neutralization tower for neutralization to adjust the water quality and water volume.

[0016] S2. Primary filtration: The wastewater after heat exchange and acid addition in S1 above, with a suspended solid content of 5000 - 30000 mg / L, enters a tubular ultrafiltration membrane for filtration. The produced water has a suspended solid content of less than 500 mg / L to ensure the continuous and stable operation of the whole system; the concentrated water enters the factory incinerator for incineration treatment.

[0017] S3. Secondary membrane separation: The filtrate separated in S2 above enters a disk tube nanofiltration unit. Sodium chloride and water pass through the membrane element to obtain a pure sodium chloride solution; triethylamine and other pollutants are intercepted and concentrated to obtain a reduced concentrated water.

[0018] S4. Evaporation and resource utilization: The pure sodium chloride solution in S3 above enters an evaporation system, and the obtained crystalline salt reaches the purity of industrial-grade sodium chloride to achieve resource utilization; the evaporated water enters the biochemical system for treatment; the concentrated water enters the factory incinerator for incineration treatment.

[0019] The beneficial effects of the present invention are as follows:

[0020] 1. In the present invention, the lower hole plate changes with the change of the wastewater inflow in the neutralization tower, so that the height of the neutralization material in the neutralization tower can adapt to the change of the wastewater volume, thereby ensuring the neutralization effect of the wastewater while improving the wastewater flow efficiency.

[0021] 2. In the present invention, by adjusting the elastic force of the first spring, the amount of the neutralization material in the neutralization cavity can be adjusted when the same amount of wastewater enters the neutralization tower, thereby expanding the application range of the neutralization tower and making the wastewater treatment more flexible.

[0022] 3. In the present invention, the spiral plate rotates with the up and down movement of the lower hole plate, so that the neutralization material in the neutralization cavity can be smoothly reduced and replenished, thereby meeting the change requirements of the neutralization material in the neutralization cavity. Description of the Drawings

[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0024] Figure 1 is a perspective view of the neutralization tower in the present invention;

[0025] Figure 2 is Figure 1 axial sectional view of;

[0026] Figure 3 is Figure 2 enlarged view at position A in;

[0027] Figure 4 is Figure 2 enlarged view at position B in;

[0028] Figure 5 is Figure 1 radial sectional view of;

[0029] Figure 6 is the position diagram of the through groove in the present invention;

[0030] Figure 7 is Figure 6 enlarged view at position C in;

[0031] Figure 8 is a perspective view of the spiral plate in the present invention;

[0032] Figure 9 is the flow chart of the processing method in the present invention.

[0033] In the figure: 1, neutralization tower; 11, support; 12, liquid inlet joint; 13, liquid outlet joint; 14, through groove; 2, avoidance shell; 21, first bolt; 22, chute; 23, slider; 24, second spring; 25, avoidance plate; 26, torsion spring; 3, upper hole plate; 31, triangular rib; 4, lower hole plate; 41, first spring; 42, upper spring seat; 43, lower spring seat; 44, second bolt; 5, folding sleeve; 51, spiral groove; 52, movable block; 6, spiral plate; 61, through hole; 62, vertical rod; 63, adjustment groove; 64, third bolt. Specific Embodiments

[0034] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0035] As Figures 1 to 9 shown, the present invention includes the following embodiments:

[0036] Embodiment 1: A treatment system for the wastewater produced in the production of vinylene carbonate, comprising a neutralization tower 1 and a bracket 11 at the bottom of the neutralization tower 1; an inlet connector 12 is provided at the top of the neutralization tower 1, and an outlet connector 13 is provided at the bottom of the neutralization tower 1; a through groove 14 is provided on the outer side at a position near the upper part of the inner wall of the neutralization tower 1; a ring-shaped avoidance shell 2 is tightened on the outer wall of the neutralization tower 1 by a first bolt 21; the avoidance shell 2 can block the through groove 14; an upper hole plate 3 is fixedly connected to the inner wall of the neutralization tower 1 and above the through groove 14; a lower hole plate 4 is movably connected to the inner wall of the neutralization tower 1 and below the through groove 14; a first spring 41 is provided between the lower surface of the lower hole plate 4 and the inner bottom wall of the neutralization tower 1; a plurality of folding sleeves 5 are provided between the upper hole plate 3 and the lower hole plate 4; the plurality of folding sleeves 5 are movably and sealingly connected to each other; the innermost folding sleeve 5 is connected upwards through the upper hole plate 3 in a penetrating manner, and the lower end of the outermost folding sleeve 5 is fixedly connected to the lower hole plate 4 in a sealed manner; a neutralizing material is filled between the upper hole plate 3 and the lower hole plate 4.

[0037] Before putting the neutralization tower 1 into use, first turn the first bolt 21. After the first bolt 21 is turned, it will move out of the corresponding threaded hole on the outer wall of the neutralization tower 1, so that the end of the first bolt 21 is separated from the contact with the outer wall of the neutralization tower 1, realizing the unlocking of the avoidance shell 2. Subsequently, control the avoidance shell 2 on the outer wall of the neutralization tower 1 to move downward, so that the through groove 14 is exposed. Then pour the neutralizing material into the through groove 14. Subsequently, control the avoidance shell 2 to move upward. After the avoidance shell 2 moves upward, it will cover the through groove 14. Then tighten the first bolt 21. After the end of the first bolt 21 is turned, it will insert into the threaded hole on the outer wall of the neutralization tower 1, realizing the locking of the avoidance shell 2. Subsequently, connect the waste water pipe to the liquid inlet joint 12 at the top of the neutralization tower 1. Then control the waste water to enter the inner side of the top of the neutralization tower 1 along the waste water pipe and the liquid inlet joint 12. An upper cavity is formed between the upper surface of the upper hole plate 3 and the inner wall of the top of the neutralization tower 1, and a lower cavity is formed between the lower surface of the lower hole plate 4 and the inner wall of the bottom of the neutralization tower 1. The waste water will enter the upper cavity from the liquid inlet joint 12. The waste water in the upper cavity will directly enter between the upper hole plate 3 and the lower hole plate 4 through the holes on the upper hole plate 3. A neutralization cavity is formed between the upper hole plate 3 and the lower hole plate 4. The waste water contacts the neutralizing material in the neutralization cavity, realizing the neutralization reaction of the waste water. The neutralized waste water will pass through the lower hole plate 4 and enter the lower cavity, and finally be discharged along the liquid outlet joint 13. When the amount of waste water in the upper cavity increases, the pressure of the waste water in the upper cavity will increase. The waste water will enter the inner side of the innermost folding sleeve 5. The multiple folding sleeves 5 will unfold under the action of the pressure of the waste water in the folding sleeve 5. During the unfolding process of the multiple folding sleeves 5, they will drive the lower hole plate 4 to move downward. During the downward movement of the lower hole plate 4, the distance between the lower hole plate 4 and the upper hole plate 3 will expand. When the height of the neutralization cavity increases, the neutralizing material inside the avoidance shell 2 will be supplemented in the neutralization cavity. In this way, the placement height of the neutralizing material in the entire neutralization cavity increases. In this way, when the waste water in the upper cavity increases, the waste water can pass through a higher height, that is, more neutralizing material, so that the waste water can be fully neutralized and the neutralization effect of the waste water is guaranteed; the gravity of the neutralizing material in the neutralization cavity will be transmitted to the first spring 41 through the lower hole plate 4. During the downward movement of the lower hole plate 4, it will overcome the elastic force of the first spring 41. When the amount of waste water in the upper cavity decreases, the pressure of the waste water in the upper cavity decreases. The first spring 41 will push the lower hole plate 4 upward. During the upward movement of the lower hole plate 4, the multiple folding sleeves 5 will be folded. During the upward movement of the lower hole plate 4, it will drive the neutralizing material in the neutralization cavity to move upward. The excess neutralizing material will enter the avoidance shell 2 along the through groove 14 for avoidance. In this way, while the height of the neutralization cavity becomes shorter, the neutralizing material in the neutralization cavity becomes less. In this way, the height of the neutralizing material in the neutralization cavity is adapted to the amount of waste water, ensuring the flow efficiency of the waste water; repeating like this, the lower hole plate 4 will change with the change in the amount of waste water entering the neutralization tower 1;

[0038] In the present invention, the lower orifice plate 4 varies within the neutralization tower 1 along with the change in the inflow rate of the wastewater, so that the height of the neutralization material within the neutralization tower 1 can adaptively change along with the change in the wastewater volume, thereby ensuring the neutralization effect of the wastewater while improving the wastewater flow efficiency.

[0039] Embodiment 2: A chute 22 is provided along the radial direction on the upper inner wall of the avoidance shell 2; a slider 23 is slidably connected within the chute 22; one side of the slider 23 away from the folding sleeve 5 is connected to one end of the chute 22 away from the folding sleeve 5 through a second spring 24; the lower surface of the slider 23 is connected to an arc-shaped avoidance plate 25.

[0040] In this embodiment, the upper end of the avoidance plate 25 is rotatably connected to the slider 23 through a torsion spring 26; adjacent avoidance plates 25 on the inner circumference of the avoidance shell 2 overlap each other.

[0041] During the upward movement of the lower orifice plate 4, the lower orifice plate 4 will hold up the neutralization material in the neutralization chamber and move it upward. The neutralization material in the neutralization chamber will be squeezed. The neutralization material inside the neutralization chamber and around the through groove 14 will be pressed and pass through the through groove 14 into the inside of the shielding shell. During the process of the neutralization material entering the inside of the shielding shell, it will squeeze the avoidance plate 25. During the process of the avoidance plate 25 being pressed, it will drive the slider 23 along the chute 22 and away from the folding sleeve 5. When the slider 23 moves along the chute 22, it will overcome the elastic force of the second spring 24. During the process of multiple avoidance plates 25 being pressed, they will expand outward, thereby creating space for the entry of the neutralization material. The gas inside the avoidance shell 2 will be pressed and flow out along the gaps between adjacent avoidance plates 25, and impact the neutralization material entering the inside of the avoidance shell 2, so that the liquid remaining on the neutralization material is washed away, and the wastewater content of the neutralization material entering the avoidance shell 2 is reduced as much as possible. During the process of multiple avoidance plates 25 expanding outward, adjacent avoidance plates 25 still maintain overlap under the action of the torsion spring 26, so that multiple avoidance plates 25 can block the neutralization material and prevent the neutralization material from crossing the avoidance plate 25 and entering the outer side of the avoidance plate 25. The avoidance plate 25 will change along with the sliding of the slider 23 to ensure that adjacent avoidance plates 25 overlap each other; during the downward movement of the lower orifice plate 4, when the distance between the lower orifice plate 4 and the upper orifice plate 3 increases and the space inside the neutralization chamber becomes larger, the avoidance plate 25 moves inward under the elastic force of the second spring 24. The second spring 24 will push the slider 23 to slide within the chute 22 and close to the folding sleeve 5. The slider 23 will drive the avoidance plate 25 to push the neutralization material inside the avoidance shell 2. The neutralization material inside the avoidance shell 2 will pass through the through groove 14 under the push of the avoidance plate 25 and enter the neutralization chamber for timely replenishment to meet the changing requirements of the neutralization material in the neutralization chamber; in this embodiment, by elastically and slidably connecting the avoidance plate 25 inside the avoidance shell 2, the neutralization material can be avoided when the lower orifice plate 4 moves upward, and more importantly, the neutralization material can be timely replenished when the lower orifice plate 4 moves downward to meet the wastewater filtration requirements.

[0042] Embodiment 3: The upper spring seat 42 is rotatably connected to the center of the lower surface of the lower hole plate 4; the upper end of the first spring 41 is fixedly connected to the upper spring seat 42, and the lower end is fixedly connected to the lower spring seat 43; the lower spring seat 43 is provided with a second bolt 44 penetrating downward; the second bolt 44 is threadedly and hermetically connected to the neutralization tower 1.

[0043] Before putting the neutralization tower 1 into use, first turn the second bolt 44. After the second bolt 44 is turned, it will drive the lower spring seat 43 to move up or down. During the upward movement of the lower spring seat 43, the lower spring seat 43 will squeeze the first spring 41, so that the initial compression length of the first spring 41 becomes smaller, thus increasing the downward movement resistance of the lower hole plate 4. In this way, when the same amount of waste water enters above the upper hole plate 3, the appropriate amount of neutralization material in the neutralization chamber becomes less. And during the downward movement of the lower spring seat 43, the initial compression length of the first spring 41 becomes larger, making the downward movement resistance of the lower hole plate 4 smaller. In this way, when the same amount of waste water enters above the upper hole plate 3, the appropriate amount of neutralization material in the neutralization chamber becomes more. In this way, in this embodiment, by adjusting the elastic force of the first spring 41, the appropriate amount of neutralization material in the neutralization chamber can be adjusted when the same amount of waste water enters the neutralization tower 1, thereby expanding the application range of the neutralization tower 1 and making the waste water treatment more flexible.

[0044] Embodiment 4: The inner wall of the folding sleeve 5 is provided with a spiral groove 51; the spiral groove 51 is movably and hermetically connected with a movable block 52; the movable block 52 is fixedly connected to the outer wall of the corresponding folding sleeve 5; adjacent folding sleeves 5 are in spiral transmission and hermetic connection.

[0045] In this embodiment, an elastic spiral plate 6 is provided between the upper hole plate 3 and the lower hole plate 4; the lower end of the spiral plate 6 is fixedly connected to the upper surface of the lower hole plate 4; the spiral plate 6 is provided with a through hole 61.

[0046] During the downward movement of the lower orifice plate 4, the lower orifice plate 4 drives the outermost folding sleeve 5 to move downward. The downward movement of the outermost folding sleeve 5 sequentially pulls multiple inner folding sleeves 5. The adjacent folding sleeves 5 are hermetically connected by spiral transmission. Therefore, after the movable block 52 moves along the corresponding spiral groove 51, the adjacent folding sleeves 5 will rotate while generating axial movement, which will drive the lower orifice plate 4 to rotate. The lower orifice plate 4 will rotate during the downward movement, and the rotating lower orifice plate 4 will drive the neutralizing material on the upper surface to rotate, so that the wastewater flowing out from the upper orifice plate 3 contacts the neutralizing material in the neutralizing cavity more evenly, improving the wastewater neutralization effect; during the upward movement of the lower orifice plate 4 pushed by the first spring 41, the lower orifice plate 4 will rotate in the reverse direction, and the neutralizing material above will be driven to rotate during the reverse rotation of the lower orifice plate 4; further, a spiral plate 6 is fixedly connected to the upper surface of the lower orifice plate 4, and the spiral plate 6 will rotate with the rotation of the lower orifice plate 4. The spiral plate 6 is equivalent to the auger in a screw extruder. During the upward movement and rotation of the lower orifice plate 4, the rotation of the spiral plate 6 causes the neutralizing material at the lower position of the neutralizing cavity to be conveyed upward, and the upward-conveyed neutralizing material enters the avoidance shell 2 faster for avoidance, thus preventing the neutralizing material in the neutralizing cavity from being too late to move away and affecting the upward movement of the lower orifice plate 4, improving the stability of the upward movement of the lower orifice plate 4. The neutralizing material in the neutralizing cavity is loosened by the rotation of the spiral plate 6, reducing the extrusion damage to the neutralizing material caused by the upward movement of the lower orifice plate 4; during the downward rotation of the lower orifice plate 4, the lower orifice plate 4 drives the spiral plate 6 to rotate. During the rotation of the spiral plate 6, the neutralizing material at the upper position of the neutralizing cavity is conveyed downward, so that the neutralizing material around the inner side of the through groove 14 quickly vacates the gap, so that the neutralizing material in the avoidance shell 2 can smoothly enter the neutralizing cavity to ensure the smooth increase of the neutralizing material in the neutralizing cavity and meet the adjustment requirements of the neutralizing material in the neutralizing cavity; through holes 61 are provided on the spiral plate 6 to enable the wastewater to smoothly pass through the spiral plate 6 and flow downward; in this embodiment, the upper end of the spiral plate 6 abuts against the lower surface of the upper orifice plate 3 through a vertical rod 62, and the space of the spiral plate 6 in the neutralizing cavity changes with the change of the neutralizing cavity; in this embodiment, the spiral plate 6 rotates with the up-and-down movement of the lower orifice plate 4, so that the neutralizing material in the neutralizing cavity can be smoothly reduced and replenished, thereby meeting the change requirements of the neutralizing material in the neutralizing cavity.

[0047] Embodiment 5: Triangular ribs 31 are arranged along the radial direction on the lower surface of the upper orifice plate 3; a plurality of the triangular ribs 31 are evenly distributed around the center of the upper orifice plate 3; the upper end of the spiral plate 6 is connected to a vertical rod 62.

[0048] In this embodiment, the specifications of the triangular ribs 31 increase as they are farther away from the center of the upper orifice plate 3; an adjustment groove 63 is provided on the outer wall of the vertical rod 62; the upper end of the spiral plate 6 is clamped into the adjustment groove 63; the adjustment groove 63 penetrates downward and is threadedly connected to a third bolt 64.

[0049] During the downward movement of the lower orifice plate 4, under the action of the spiral groove 51 and the movable block 52, the lower orifice plate 4 will rotate. During the rotation of the lower orifice plate 4, the spiral plate 6 will be driven to rotate. During the rotation of the spiral plate 6, the neutralizing material in the neutralizing chamber will be conveyed downward. During the rotation of the spiral plate 6, the upper end of the vertical rod 62 will move on the lower surface of the upper orifice plate 3. The vertical rod 62 will pass through the triangular prism 31. During the process of the vertical rod 62 passing through the triangular prism 31, the pitch of the spiral plate 6 will be compressed. After the vertical rod 62 passes over the triangular prism 31, the self-pitch of the elastic spiral plate 6 will expand. In this way, the spiral plate 6 will generate vibrations during rotation. The vibrating spiral plate 6 will keep the neutralizing material in the neutralizing chamber loose, preventing the neutralizing material from getting stuck in the spiral gaps of the spiral plate 6 and affecting the conveying, preventing the neutralizing material from being too compact and affecting the conveying of the neutralizing material, and also preventing the neutralizing material from being too compact and affecting the passage of wastewater. During the upward movement of the lower orifice plate 4, the vertical rod 62 will also intermittently pass over the triangular prism 31, so that the spiral plate 6 will also vibrate while rotating, and the effect is the same as above.

[0050] In addition, by loosening the third bolt 64, the upper end of the vertical rod 62 can be unlocked on the spiral plate 6. Then, the vertical rod 62 is controlled to move closer to or away from the folding sleeve 5, so as to change the position of the vertical rod 62 connected to the upper end of the spiral plate 6. Then, the third bolt 64 is tightened to lock the position of the vertical rod 62. The closer the vertical rod 62 is to the folding sleeve 5, the smaller the specification of the triangular prism 31 passed by the vertical rod 62. In this way, the amplitude of the spiral plate 6 is smaller, and vice versa, the amplitude is larger. Thus, the amplitude of the spiral plate 6 can be adjusted to meet different types of neutralizing agents, and the scope of application is further improved.

[0051] Example 6: A method for treating wastewater from the production of vinylene carbonate, which is applicable to the above-mentioned wastewater treatment system for the production of vinylene carbonate. The steps of this method are as follows:

[0052] S1. Pretreatment: The wastewater is first cooled to about 25 °C by a heat exchanger and then enters the neutralization tower 1 for neutralization to adjust the water quality and water volume.

[0053] S2. Primary filtration: The wastewater after heat exchange and acid addition in S1 above has a suspended solid content of 5000 - 30000 mg / L. After passing through the tubular ultrafiltration membrane filtration, the suspended solids in the produced water reach below 500 mg / L to ensure the continuous and stable operation of the whole system. The concentrated water enters the factory incinerator for incineration treatment.

[0054] S3. Secondary membrane separation: The filtrate separated in S2 above enters the disc tube nanofiltration unit. Sodium chloride and water pass through the membrane element to obtain a pure sodium chloride solution. Triethylamine and other pollutants are intercepted and concentrated to obtain a reduced concentrated water.

[0055] S4. Evaporation and resource utilization: The pure sodium chloride solution in S3 above enters the evaporation system, and the obtained crystalline salt reaches the purity of industrial-grade sodium chloride, realizing resource utilization; the evaporated water enters the biochemical system for treatment; the concentrated water enters the factory incinerator for incineration disposal.

[0056] This embodiment provides a treatment method based on tubular membranes, disk tube membranes, and evaporators to solve the problems of large evaporation water volume, high energy consumption, inability to realize resource utilization of waste salt, and poor biodegradability of the evaporated water in the current wastewater treatment methods.

[0057] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the Figure 1 orientation or positional relationship shown, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the protection scope of the present invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0058] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A wastewater treatment system for producing vinylene carbonate, comprising a neutralization tower and a bracket at the bottom of the neutralization tower; a liquid inlet joint is arranged at the top of the neutralization tower, and a liquid outlet joint is arranged at the bottom of the neutralization tower; it is characterized in that: A through groove is arranged outward at a position near the upper part of the inner wall of the neutralization tower; a ring-shaped avoidance shell is tightly screwed to the outer wall of the neutralization tower by a first bolt; the avoidance shell can block the through groove; an upper hole plate is fixedly connected to the inner wall of the neutralization tower and above the through groove; a lower hole plate is movably connected to the inner wall of the neutralization tower and below the through groove; a first spring is arranged between the lower surface of the lower hole plate and the inner bottom wall of the neutralization tower; a plurality of folding sleeves are arranged between the upper hole plate and the lower hole plate; the plurality of folding sleeves are movably and hermetically connected to each other; the innermost folding sleeve is connected upward through the upper hole plate in a penetrating manner, and the lower end of the outermost folding sleeve is hermetically fixed to the lower hole plate; a neutralizing material is filled between the upper hole plate and the lower hole plate.

2. The wastewater treatment system for producing vinylene carbonate according to claim 1, wherein: A chute is arranged along the radial direction on the upper inner wall of the avoidance shell; a slider is slidably connected in the chute; a second spring is connected between the surface of the slider away from the folding sleeve and one end of the chute away from the folding sleeve; the lower surface of the slider is connected with an arc-shaped avoidance plate.

3. The treatment system for the wastewater from the production of vinylene carbonate according to claim 2, wherein: The upper end of the avoidance plate is rotatably connected to the slider through a torsion spring; adjacent avoidance plates on the inner circumference of the avoidance shell overlap each other.

4. A vinyl carbonate production wastewater treatment system according to claim 1, characterized in that: The center of the lower surface of the lower hole plate is rotatably connected with an upper spring seat; the upper end of the first spring is fixedly connected to the upper spring seat, and the lower end is fixedly connected to a lower spring seat; a second bolt is arranged downward through the lower spring seat; the second bolt is threadedly and hermetically connected to the neutralization tower.

5. A vinylene carbonate production wastewater treatment system according to claim 4, characterized in that: A spiral groove is arranged on the inner wall of the folding sleeve; a movable block is movably and hermetically connected in the spiral groove; the movable block is fixedly connected to the outer wall of the corresponding folding sleeve; adjacent folding sleeves are hermetically connected by spiral transmission.

6. The wastewater treatment system for vinylidene carbonate production according to claim 5, characterized in that: An elastic spiral plate is arranged between the upper hole plate and the lower hole plate; the lower end of the spiral plate is fixedly connected to the upper surface of the lower hole plate; through holes are arranged on the spiral plate.

7. The wastewater treatment system for vinylene carbonate production according to claim 6, wherein: Triangular prisms are arranged along the radial direction on the lower surface of the upper hole plate; the plurality of triangular prisms are evenly distributed around the center of the upper hole plate; the upper end of the spiral plate is connected with a vertical rod.

8. The wastewater treatment system for vinyl carbonate production according to claim 7, wherein: The specifications of the triangular prisms increase as they are farther away from the center of the upper hole plate; an adjusting groove is arranged on the outer wall of the vertical rod; the upper end of the spiral plate is clamped into the adjusting groove; a third bolt is threadedly connected downward through the adjusting groove.

9. A method for treating wastewater from the production of vinylene carbonate, which is applicable to the wastewater treatment system for the production of vinylene carbonate described in any one of claims 1-8, characterized in that: The steps of this method are as follows: S1. Pretreatment: The wastewater is first cooled to 25 °C by a heat exchanger and then enters the neutralization tower for neutralization to adjust the water quality and water volume. S2. Primary filtration: The wastewater after heat exchange and acid addition in S1 above, with a suspended solid content of 5000 - 30000 mg / L, enters the tubular ultrafiltration membrane for filtration, and the suspended solids in the produced water reach below 500 mg / L; the concentrated water enters the factory incinerator for incineration treatment. S3. Secondary membrane separation: The filtrate separated in S2 above enters the disc tube nanofiltration unit, and sodium chloride and water pass through the membrane element to obtain a pure sodium chloride solution; triethylamine and other pollutants are intercepted and concentrated to obtain a reduced concentrated water. S4. Evaporation and resource utilization: The pure sodium chloride solution in S3 above enters the evaporation system, and the obtained crystalline salt reaches the purity of industrial-grade sodium chloride; the evaporated water enters the biochemical system for treatment. The concentrated water enters the factory incinerator for incineration treatment.

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