A phase separation tank and a solvent phase separation recovery device using the same

Abstract

The utility model discloses a kind of phase separation tank and the solvent phase separation recovery device applied to it, the phase separation tank includes tank body, light phase discharge pipe, heavy phase discharge pipe, sealing plate, float component and counterweight component;Wherein, the tank body is equipped with feed inlet, the light phase discharge pipe is connected on the tank body, the heavy phase discharge pipe is connected on the tank body, one end of the heavy phase discharge pipe is stretched to the tank body inside, the sealing plate is rotatably connected on one end of the heavy phase discharge pipe that stretches to the tank body and has the opening position of being rotated to place upwards and the closing position of being rotated to place downwards, the float component is connected with the sealing plate by connecting component, when the float component floats in heavy phase liquid, it is used to drive the sealing plate to rotate to the opening position by buoyancy upwards. The utility model can control the height between light phase layer and heavy phase layer at low cost, can reduce the production cost of phase separation tank, and then reduce the economic burden of enterprise.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of phase separation tank and the solvent phase separation recovery device for applying it. BACKGROUND

[0002] Currently, toluene needs to be used as solvent in the process of producing carboxylic acid product and a series of processes such as cyclization reaction, hydrolysis reaction, acidification reaction, centrifugal separation and drying are carried out, the tail gas generated needs to be absorbed by alkali absorption tower and water absorption tower and then enters the activated carbon treatment device for adsorption treatment, the activated carbon in the activated carbon treatment device needs to be resolved after a period of use, and in the resolved liquid obtained, in addition to water, there is also a lot of toluene, if this resolved liquid containing a large amount of toluene is directly discharged into the sewage treatment device, not only the toluene in the resolved liquid will be wasted, but also the load of sewage treatment will be increased, therefore, in the prior art, a phase separation tank is usually used to separate the resolved liquid. Because the density of toluene is less than that of water, in the phase separation tank, toluene as light phase liquid will float on the upper side to form a light phase layer, and water as heavy phase liquid will sink on the lower side to form a heavy phase layer, a boundary surface will be formed between the light phase layer and the heavy phase layer, toluene in the light phase layer will be discharged from the light phase discharge pipe at the upper end of the phase separation tank for recycling, and water in the heavy phase layer will be discharged from the heavy phase discharge pipe at the lower end of the phase separation tank into a sewage pool for sewage treatment.

[0003] However, if the discharge speed of the heavy phase discharge pipe is too fast, the heavy phase liquid will be quickly discharged, which will in turn cause the heavy phase layer to become thin, and thus the boundary surface between the light phase layer and the heavy phase layer will continuously decrease, and thus when the boundary surface is too low, there is a risk that the light phase liquid will be discharged from the heavy phase discharge pipe. Conversely, if the discharge speed of the heavy phase discharge pipe is too slow, the heavy phase liquid will be slowly discharged, which will in turn cause the heavy phase layer to become thick, and thus the boundary surface between the light phase layer and the heavy phase layer will continuously increase, and thus when the boundary surface is too high, there is a risk that the heavy phase liquid will be discharged from the light phase discharge pipe. In order to avoid the above risks, in the prior art, an interface meter is usually used to monitor the boundary surface between the light phase layer and the heavy phase layer, and a valve is used to control the discharge speed of the heavy phase discharge pipe, so as to maintain the boundary surface at a suitable height. For example, in the vertical phase separation tank for mixture separation disclosed in the Chinese patent with the publication number CN217567543U, the height of the boundary surface is controlled by the interlocking control of the interface meter and the pneumatic on-off valve. However, since the interface meter is expensive, the scheme of using the interface meter to control the height of the boundary surface in combination with the valve will greatly increase the production cost of the phase separation tank, and thus will bring a large economic burden to the enterprise. UTILITY MODEL CONTENT

[0004] The technical problem to be solved by the utility model is to overcome the defects of the prior art, and to provide a phase separation tank which can control the height of the boundary surface between the light phase layer and the heavy phase layer at a low cost, can reduce the production cost of the phase separation tank, and thus can reduce the economic burden of the enterprise.

[0005] To solve the above technical problems, the technical scheme of the utility model is: a phase separation tank, which comprises a tank body, a light phase discharge pipe, a heavy phase discharge pipe, a sealing plate, a floating body component and a counterweight component;

[0006] The tank body is provided with an inlet for connecting a liquid to be phase separated;

[0007] The light phase discharge pipe is connected to the tank body and used for discharging light phase liquid after phase separation in the tank body;

[0008] The heavy phase discharge pipe is connected to the tank body and used for discharging heavy phase liquid after phase separation in the tank body, and one end of the heavy phase discharge pipe extends into the tank body;

[0009] The sealing plate is rotatably connected to one end of the heavy phase discharge pipe extending into the tank body and has an open position of rotating upward to a position and a closed position of rotating downward to a position, the sidewall of the sealing plate is attached to the pipe opening of the heavy phase discharge pipe to block the heavy phase discharge pipe when the sealing plate rotates to the closed position, and the sealing plate is dislocated from the pipe opening of the heavy phase discharge pipe to open the heavy phase discharge pipe when the sealing plate rotates to the open position;

[0010] The floating body component is connected to the sealing plate through a connecting component, and the floating body component is used for driving the sealing plate to rotate upward to the open position by buoyancy when the floating body component floats in heavy phase liquid;

[0011] The counterweight component is connected to the sealing plate and used for driving the sealing plate to rotate downward to the closed position by gravity when the floating body component floats in light phase liquid.

[0012] Further, one end of the heavy phase discharge pipe extending into the tank body is provided with a flange mounting portion, and the sealing plate is rotatably connected to the flange mounting portion.

[0013] Further, the sidewall of the sealing plate is attached to the end face of the flange mounting portion, a Teflon layer is arranged on the sidewall of the sealing plate attached to the flange mounting portion, and a Teflon layer is also arranged on the end face of the flange mounting portion attached to the sealing plate.

[0014] Further, a lower limit slot is arranged on the sealing plate, and a lower limit pin is connected to the flange mounting portion and used for being clamped into the lower limit slot and supporting the sealing plate when the sealing plate rotates downward to the closed position.

[0015] Further, an upper limit slot is arranged on the sealing plate, and an upper limit pin is connected to the flange mounting portion and used for being matched in the upper limit slot and resisting against the bottom of the upper limit slot when the sealing plate rotates upward to the open position, thereby limiting the sealing plate.

[0016] Furthermore, one end of the sealing plate is rotatably connected to the flange mounting part, and the other end of the sealing plate is provided with a connecting hole. One end of the connecting component is connected to the connecting hole, and the other end of the connecting component is connected to the float component.

[0017] A further provision provides a specific structure for the connecting component, wherein the connecting component is a connecting rope.

[0018] Furthermore, the tank body is also provided with an overflow baffle, the outer periphery of which is connected to the inner wall of the tank body, an overflow groove is provided between the overflow baffle and the tank body, the light phase discharge pipe is connected to the overflow groove, and the center of the overflow baffle is provided with an overflow channel for allowing the light phase liquid to overflow into the overflow groove.

[0019] Further, a specific structure of the overflow enclosure is provided, the overflow enclosure includes a radial extension and an axial extension, the outer periphery of the radial extension is connected to the inner wall of the tank, the inner periphery of the radial extension is connected to the lower end of the axial extension, the overflow channel is disposed on the inner side of the axial extension, and the overflow groove is disposed between the axial extension and the inner wall of the tank.

[0020] This utility model also provides a solvent phase separation and recovery device, including a light phase storage tank, a heavy phase storage tank, a first discharge pump, a second discharge pump, a first level gauge, a second level gauge, a first controller, a second controller, and the phase separation tank;

[0021] The light phase discharge pipe is connected to the inlet of the light phase storage tank, and the heavy phase discharge pipe is connected to the inlet of the heavy phase storage tank.

[0022] The inlet of the first discharge pump is connected to the outlet of the light phase storage tank, and the inlet of the second discharge pump is connected to the outlet of the heavy phase storage tank.

[0023] The first level gauge is installed in the light phase storage tank and is used to detect the liquid level in the light phase storage tank.

[0024] The second level gauge is installed in the heavy phase storage tank and is used to detect the liquid level in the heavy phase storage tank;

[0025] The first controller is connected to the first level gauge and the first discharge pump respectively and is used to control the first discharge pump to start discharging according to the liquid level height in the light phase storage tank measured by the first level gauge.

[0026] The second controller is connected to the second level gauge and the second discharge pump respectively, and is used to control the second discharge pump to start discharging according to the liquid level height in the heavy phase storage tank measured by the second level gauge.

[0027] Using the above technical solution, after the liquid to be separated enters the tank through the inlet, the lighter phase liquid floats on top to form a lighter phase layer, while the heavier phase liquid sinks to the bottom to form a heavier phase layer. An interface is formed between the light and heavy phase layers. The lighter phase liquid in the light phase layer overflows from the light phase outlet pipe, and the heavier phase liquid in the heavy phase layer is discharged from the heavy phase outlet pipe. In a stable equilibrium state, the float component floats at the interface, with one part of the float component located in the heavy phase layer and the other part in the light phase layer. At this time, the sealing plate is between the open and closed positions, so the heavy phase outlet pipe is in a semi-open, semi-closed state. When the discharge rate of the heavy phase outlet pipe is too fast, or when the content of the heavy phase liquid in the liquid to be separated in the tank entering from the inlet decreases, the thickness of the heavy phase layer will gradually thin, and the interface will drop. At this time, the floating component will transfer to the light phase liquid and float in the light phase liquid above the interface. As is well known, the magnitude of buoyancy is equal to the weight of the liquid displaced by the object. Since the density of the light phase liquid in the light phase layer is lower, the buoyancy of the floating component floating in the light phase liquid becomes smaller. At this time, the counterweight component will drive the sealing plate downward to the closed position through gravity, thereby... The heavy phase discharge pipe is sealed off, preventing the heavy phase liquid from being discharged from the heavy phase discharge pipe. As liquid to be separated is continuously introduced into the inlet, the heavy phase liquid in the tank will gradually accumulate and increase, causing the heavy phase layer to gradually thicken and the separation interface to gradually rise. During the process of the separation interface rising, the float component will gradually transfer from the light phase liquid to the heavy phase liquid, and the buoyancy of the float component will gradually increase. As a result, the float component will drive the sealing plate to rotate upward through the connecting component, so that the heavy phase discharge pipe is opened slightly until it returns to the initial equilibrium and stable state. Conversely, when the discharge rate of the heavy phase discharge pipe is too slow or the content of the heavy phase liquid in the liquid to be separated in the tank entering from the inlet increases, the heavy phase layer will thicken and the interface will rise. At this time, the float component will transfer to the heavy phase liquid and float in the heavy phase liquid below the interface. As we all know, the magnitude of buoyancy is equal to the weight of the liquid displaced by the object. Since the density of the heavy phase liquid in the heavy phase layer is high, the buoyancy of the float component floating in the heavy phase liquid increases. The float component will then drive the sealing plate to rotate upward to the open position through buoyancy, thereby making the heavy phase discharge pipe fully open so that the heavy phase liquid can be discharged quickly from the heavy phase discharge pipe. As the heavy phase liquid in the tank gradually decreases, the heavy phase layer will gradually thin and the interface will gradually descend. During the process of the interface descending, the float component will transfer from the heavy phase liquid to the light phase liquid. The buoyancy on the float component will gradually decrease, and the counterweight component will drive the sealing plate to rotate downward under the action of gravity, so that the heavy phase discharge pipe will be closed a little, until it returns to a stable equilibrium state.In this embodiment, the height of the interface between the light and heavy phase liquids can be controlled at a lower cost by varying the buoyancy of the float component within the heavy and light phase liquids. This allows the interface to be maintained at a suitable height, eliminating the need for expensive interface meters and significantly reducing the manufacturing cost of the phase separation tank, thereby alleviating the economic burden on enterprises. Furthermore, maintaining the interface at a suitable height avoids the risks of light phase liquid discharging from the heavy phase discharge pipe when the interface is too low, and heavy phase liquid discharging from the light phase discharge pipe when the interface is too high. Attached Figure Description

[0028] Figure 1 This is a front sectional view of the phase separation tank of this utility model;

[0029] Figure 2 This is a three-dimensional sectional view of the phase separation tank of this utility model;

[0030] Figure 3 This is a schematic diagram of the structure of the floating component of this utility model when it is located in a light phase layer;

[0031] Figure 4 This is a schematic diagram of the structure of the floating body component of this utility model when it is located in the heavy phase layer;

[0032] Figure 5 This is a schematic diagram of the structure of the sealing plate of this utility model when it is in the closed position;

[0033] Figure 6 This is a schematic diagram of the structure of the sealing plate of this utility model when it is in the open position;

[0034] Figure 7 This is a cross-sectional structural diagram of the heavy phase discharge pipe and sealing plate of this utility model;

[0035] Figure 8 This is a process flow diagram of the solvent phase separation and recovery device of this utility model;

[0036] In the diagram: 1. Tank body; 2. Light phase discharge pipe; 3. Heavy phase discharge pipe; 4. Sealing plate; 5. Float component; 6. Counterweight component; 7. Inlet; 8. Connecting component; 9. Light phase layer; 10. Heavy phase layer; 11. Interface; 12. Drain port; 13. Flange mounting part; 14. Lower limit groove; 15. Lower limit pin; 16. Upper limit groove; 17. Upper limit pin; 18. Connecting hole; 19. Overflow baffle; 20. Overflow groove; 21. Overflow channel; 22. Radial extension; 23. Axial extension; 24. Light phase storage tank; 25. Heavy phase storage tank; 26. First discharge pump; 27. Second discharge pump; 28. First level gauge; 29. ​​Second level gauge. Detailed Implementation

[0037] To make the contents of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0038] Example 1: As Figures 1-7 As shown, a phase separation tank includes a tank body 1, a light phase discharge pipe 2, a heavy phase discharge pipe 3, a sealing plate 4, a float component 5, and a counterweight component 6.

[0039] The tank body 1 is provided with a feed port 7 for receiving the liquid to be separated into phases;

[0040] The light phase discharge pipe 2 is connected to the tank body 1 and is used to discharge the light phase liquid after phase separation in the tank body 1;

[0041] The heavy phase discharge pipe 3 is connected to the tank 1 and is used to discharge the heavy phase liquid after phase separation in the tank 1. One end of the heavy phase discharge pipe 3 extends into the tank 1.

[0042] The sealing plate 4 is rotatably connected to one end of the heavy phase discharge pipe 3 that extends into the tank body 1 and has an open position that rotates upward and a closed position that rotates downward. When the sealing plate 4 is rotated to the closed position, the side wall of the sealing plate 4 fits against the opening of the heavy phase discharge pipe 3 to block the heavy phase discharge pipe 3. When the sealing plate 4 is rotated to the open position, the sealing plate 4 is misaligned with the opening of the heavy phase discharge pipe 3 to open the heavy phase discharge pipe 3.

[0043] The floating component 5 is connected to the sealing plate 4 via the connecting component 8. When the floating component 5 floats in the heavy phase liquid, it is used to drive the sealing plate 4 to rotate upward to the open position by buoyancy.

[0044] The counterweight component 6 is connected to the sealing plate 4 and is used to rotate the sealing plate 4 downward to the closed position by gravity when the float component 5 floats in the light phase liquid.

[0045] Specifically, after the liquid to be separated enters the tank 1 through the feed inlet 7, the light phase liquid floats to the top, forming a light phase layer 9, while the heavy phase liquid sinks to the bottom, forming a heavy phase layer 10. An interface 11 is formed between the light phase layer 9 and the heavy phase layer 10. The light phase liquid in the light phase layer 9 overflows from the light phase discharge pipe 2, and the heavy phase liquid in the heavy phase layer 10 is discharged from the heavy phase discharge pipe 3. For example... Figure 1As shown, in a stable equilibrium state, the floating component 5 floats at the interface 11. At this time, part of the floating component 5 is located in the heavy phase layer 10 and the other part is located in the light phase layer 9. The sealing plate 4 is located between the open and closed positions, so the heavy phase discharge pipe 3 is in a semi-open and semi-closed state. When the discharge speed of the heavy phase discharge pipe 3 is too fast or the content of the heavy phase liquid in the liquid to be separated in the tank 1 introduced from the inlet 7 decreases, the thickness of the heavy phase layer 10 will gradually thin, and the interface 11 will drop. Figure 3 The floating component 5, as shown, will transfer to the light phase liquid and float in the light phase liquid above the interface 11. As is well known, the magnitude of buoyancy is equal to the weight of the liquid displaced by the object. Since the density of the light phase liquid in the light phase layer 9 is relatively small, the buoyancy of the floating component 5 floating in the light phase liquid becomes smaller. At this time, the counterweight component 6 will drive the sealing plate 4 to rotate downward to the closed position through gravity, thereby blocking and closing the heavy phase discharge pipe 3, so that the heavy phase liquid can no longer be discharged from the heavy phase discharge pipe 3. As the inlet 7 continuously receives the liquid to be separated, the heavy phase liquid in the tank 1 will gradually accumulate and increase, thereby making the heavy phase layer 10 gradually thicker and the interface 11 gradually rise. During the process of the interface 11 rising, the floating component 5 will gradually transfer from the light phase liquid to the heavy phase liquid, and the buoyancy of the floating component 5 will gradually increase. Then, the floating component 5 will drive the sealing plate 4 to rotate upward through the connecting component 8 to open the heavy phase discharge pipe 3 slightly, until it returns to the initial equilibrium and stable state. Conversely, if the discharge rate of the heavy phase discharge pipe 3 is too slow, or if the content of the heavy phase liquid in the liquid to be separated entering the tank 1 from the inlet 7 increases, the heavy phase layer 10 will thicken, causing the interface 11 to rise. In this case, if... Figure 4The floating component 5, as shown, will transfer to the heavy phase liquid and float in the heavy phase liquid below the interface 11. As is well known, the magnitude of buoyancy is equal to the weight of the liquid displaced by the object. Since the density of the heavy phase liquid in the heavy phase layer 10 is high, the buoyancy of the floating component 5 floating in the heavy phase liquid increases. As a result, the floating component 5 will drive the sealing plate 4 to rotate upward to the open position through buoyancy, thereby fully opening the heavy phase discharge pipe 3 so that the heavy phase liquid can be discharged quickly from the heavy phase discharge pipe 3. As the heavy phase liquid in the tank 1 gradually decreases, the heavy phase layer 10 will gradually thin, and the interface 11 will gradually descend. During the descent of the interface 11, the floating component 5 will transfer from the heavy phase liquid to the light phase liquid. The buoyancy of the floating component 5 will gradually decrease, and the counterweight component 6 will drive the sealing plate 4 to rotate downward under the action of gravity, so that the heavy phase discharge pipe 3 will be closed partially, until it returns to a balanced and stable state. In this embodiment, the height of the interface 11 between the light phase layer 9 and the heavy phase layer 10 can be controlled at a lower cost by utilizing the buoyancy of the float component 5 in the heavy phase liquid and the light phase liquid. This allows the interface 11 to be maintained at a suitable height, eliminating the need for an expensive interface meter, significantly reducing the manufacturing cost of the phase separation tank, and thus reducing the economic burden on the enterprise. Furthermore, maintaining the interface 11 at a suitable height avoids the risk of the light phase liquid being discharged from the heavy phase discharge pipe 3 when the interface 11 is too low, and the risk of the heavy phase liquid being discharged from the light phase discharge pipe 2 when the interface 11 is too high.

[0046] In this embodiment, the light phase discharge pipe 2 is connected to the upper end of the tank body 1, the heavy phase discharge pipe 3 is connected to the lower end of the tank body 1, the feed port 7 is located in the middle of the tank body 1 in the height direction, the bottom of the tank body 1 is provided with a drain port 12, the drain port 12 is used to connect a drain valve, and the float component 5 can be a float ball.

[0047] like Figures 3-7 As shown, a flange mounting part 13 may be provided on one end of the heavy phase discharge pipe 3 that extends into the tank body 1, and the sealing plate 4 is rotatably connected to the flange mounting part 13.

[0048] like Figures 3-7 As shown, the side wall of the sealing plate 4 is fitted with the end face of the flange mounting part 13. A Teflon layer is provided on the side wall of the sealing plate 4 that is fitted with the flange mounting part 13, and a Teflon layer is also provided on the end face of the flange mounting part 13 that is fitted with the sealing plate 4. Specifically, the friction coefficient of the Teflon layer is very small, which can reduce the friction force when the sealing plate 4 rotates.

[0049] like Figure 5 , 6As shown, the sealing plate 4 may be provided with a lower limit groove 14, and the flange mounting part 13 may be connected with a lower limit pin 15 for engaging in the lower limit groove 14 and supporting the sealing plate 4 when the sealing plate 4 is rotated downward to the closed position.

[0050] like Figure 5 , 6 As shown, the sealing plate 4 may be provided with an upper limit groove 16, and the flange mounting part 13 may be connected with an upper limit pin 17 that fits in the upper limit groove 16 and is used to abut against the bottom of the upper limit groove 16 and thus limit the sealing plate 4 when the sealing plate 4 is rotated upward to the open position.

[0051] like Figures 5-7 As shown, one end of the sealing plate 4 is rotatably connected to the flange mounting part 13, and the other end of the sealing plate 4 is provided with a connecting hole 18. One end of the connecting component 8 is connected to the connecting hole 18, and the other end of the connecting component 8 is connected to the floating body component 5. Specifically, the connecting component 8 is a connecting rope, and one end of the connecting rope is tied to the connecting hole 18.

[0052] like Figures 1-4 As shown, the tank body 1 may also be provided with an overflow baffle 19. The outer periphery of the overflow baffle 19 is connected to the inner wall of the tank body 1. An overflow groove 20 is provided between the overflow baffle 19 and the tank body 1. The light phase discharge pipe 2 is connected to the overflow groove 20. The center of the overflow baffle 19 is provided with an overflow channel 21 for allowing the light phase liquid to overflow into the overflow groove 20.

[0053] like Figures 1-4 As shown, the overflow enclosure 19 may include a radial extension 22 and an axial extension 23. The outer periphery of the radial extension 22 is connected to the inner wall of the tank 1, and the inner periphery of the radial extension 22 is connected to the lower end of the axial extension 23. The overflow channel 21 is located inside the axial extension 23, and the overflow trough 20 is located between the axial extension 23 and the inner wall of the tank 1. Specifically, the heavy phase liquid in the heavy phase layer 10 will be discharged from the heavy phase discharge pipe 3, and the light phase liquid in the light phase layer 9 will overflow from the overflow channel 21 into the overflow trough 20 and then be discharged from the light phase discharge pipe 2.

[0054] Example 2: Figure 8 As shown, a solvent phase separation and recovery device includes a light phase storage tank 24, a heavy phase storage tank 25, a first discharge pump 26, a second discharge pump 27, a first level gauge 28, a second level gauge 29, a first controller, a second controller, and a phase separation tank as described in Example 1.

[0055] The light phase discharge pipe 2 is connected to the inlet of the light phase storage tank 24, and the heavy phase discharge pipe 3 is connected to the inlet of the heavy phase storage tank 25.

[0056] The inlet of the first discharge pump 26 is connected to the outlet of the light phase storage tank 24, and the inlet of the second discharge pump 27 is connected to the outlet of the heavy phase storage tank 25.

[0057] The first level gauge 28 is installed in the light phase storage tank 24 and is used to detect the liquid level in the light phase storage tank 24.

[0058] The second level gauge 29 is installed in the heavy phase storage tank 25 and is used to detect the liquid level in the heavy phase storage tank 25;

[0059] The first controller is connected to the first level gauge 28 and the first discharge pump 26 respectively and is used to control the first discharge pump 26 to start discharging according to the liquid level height in the light phase storage tank 24 measured by the first level gauge 28.

[0060] The second controller is connected to the second level gauge 29 and the second discharge pump 27 respectively, and is used to control the second discharge pump 27 to start discharging according to the liquid level height in the heavy phase storage tank 25 measured by the second level gauge 29.

[0061] Specifically, the eluent containing toluene and water is introduced into the tank 1 for phase separation. Toluene, being a light phase liquid, floats on top to form a light phase layer 9, while water, being a heavy phase liquid, sinks to the bottom to form a heavy phase layer 10. The toluene in the upper light phase layer 9 is discharged from the light phase discharge pipe 2 into the light phase storage tank 24, and the water in the lower heavy phase layer 10 is discharged from the heavy phase discharge pipe 3 into the heavy phase storage tank 25. When the first level gauge 28 detects that the toluene level in the light phase storage tank 24 has reached a set height, the first controller will control the first discharge pump 26 to start, thereby pumping the toluene in the light phase storage tank 24 out for recycling. When the second level gauge 29 detects that the water level in the heavy phase storage tank 25 has reached a set height, the second controller will control the second discharge pump 27 to start, thereby pumping the water in the heavy phase storage tank 25 to the sewage tank for sewage treatment. Therefore, by adopting the solvent phase separation and recovery device of this application embodiment, toluene in the eluent can be recovered and reused, thereby avoiding the waste of toluene and avoiding the treatment of large amounts of toluene in wastewater, reducing the load on wastewater treatment. In addition, it can also avoid the risk of light phase liquid being discharged from heavy phase discharge pipe 3 when the interface 11 is too low and heavy phase liquid being discharged from light phase discharge pipe 2 when the interface 11 is too high.

[0062] In summary, after the liquid to be separated enters the tank 1 through the inlet 7, the light phase liquid floats on top to form a light phase layer 9, while the heavy phase liquid sinks to the bottom to form a heavy phase layer 10. An interface 11 is formed between the light phase layer 9 and the heavy phase layer 10. The light phase liquid in the light phase layer 9 overflows from the light phase outlet pipe 2, and the heavy phase liquid in the heavy phase layer 10 is discharged from the heavy phase outlet pipe 3. In a stable equilibrium state, the float component 5 floats at the interface 11. At this time, part of the float component 5 is located in the heavy phase layer 10 and the other part is located in the light phase layer 9. The sealing plate 4 is located between the open and closed positions, so the heavy phase outlet pipe 3 is in a semi-open and semi-closed state. When the discharge rate of the heavy phase discharge pipe 3 is too fast or the content of the heavy phase liquid in the liquid to be separated in the tank 1 introduced from the inlet 7 decreases, the thickness of the heavy phase layer 10 will gradually thin, and the interface 11 will drop. At this time, the floating component 5 will transfer to the light phase liquid and float in the light phase liquid above the interface 11. As is well known, the magnitude of buoyancy is equal to the weight of the liquid displaced by the object. Since the density of the light phase liquid in the light phase layer 9 is relatively small, the buoyancy of the floating component 5 floating in the light phase liquid decreases. At this time, the counterweight component 6 will drive the sealing plate 4 to rotate downward to the closed position through gravity, thereby closing the... The heavy phase discharge pipe 3 is blocked and closed, preventing the heavy phase liquid from being discharged from the heavy phase discharge pipe 3. As the inlet 7 continuously receives the liquid to be separated, the heavy phase liquid in the tank 1 will gradually accumulate and increase, causing the heavy phase layer 10 to gradually thicken and the separation interface 11 to gradually rise. During the rising process of the separation interface 11, the float component 5 will gradually transfer from the light phase liquid to the heavy phase liquid, and the buoyancy of the float component 5 will gradually increase. As a result, the float component 5 will drive the sealing plate 4 to rotate upward through the connecting component 8, so that the heavy phase discharge pipe 3 is opened slightly, until it returns to the initial equilibrium and stable state. Conversely, when the discharge speed of the heavy phase discharge pipe 3 is too slow or the content of the heavy phase liquid in the liquid to be separated in the tank 1 introduced from the inlet 7 increases, the heavy phase layer 10 will thicken, causing the interface 11 to rise. At this time, the floating component 5 will transfer into the heavy phase liquid and float in the heavy phase liquid below the interface 11. As is well known, the magnitude of buoyancy is equal to the weight of the liquid displaced by the object. Since the density of the heavy phase liquid in the heavy phase layer 10 is high, the buoyancy of the floating component 5 floating in the heavy phase liquid increases. Consequently, the floating component 5 will drive the sealing plate 4 through buoyancy. Rotate upwards to the open position, thereby fully opening the heavy phase discharge pipe 3 to allow the heavy phase liquid to be discharged quickly from the heavy phase discharge pipe 3. As the heavy phase liquid in the tank 1 gradually decreases, the heavy phase layer 10 will gradually thin, and the interface 11 will gradually descend. During the descent of the interface 11, the float component 5 will transfer from the heavy phase liquid to the light phase liquid. The buoyancy of the float component 5 will gradually decrease, and then the counterweight component 6 will drive the sealing plate 4 to rotate downwards under the action of gravity to close the heavy phase discharge pipe 3 partially, until it returns to a balanced and stable state.In this embodiment, the height of the interface 11 between the light phase layer 9 and the heavy phase layer 10 can be controlled at a lower cost by varying the buoyancy of the float component 5 in the heavy and light phase liquids. This allows the interface 11 to be maintained at a suitable height, eliminating the need for expensive interface meters and significantly reducing the manufacturing cost of the phase separation tank, thereby reducing the economic burden on enterprises. Furthermore, maintaining the interface 11 at a suitable height avoids the risks of light phase liquid being discharged from the heavy phase discharge pipe 3 when the interface 11 is too low, and heavy phase liquid being discharged from the light phase discharge pipe 2 when the interface 11 is too high.

[0063] The specific embodiments described above further illustrate the technical problems, technical solutions, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A phase separation tank, characterized in that, It includes a tank body (1), a light phase discharge pipe (2), a heavy phase discharge pipe (3), a sealing plate (4), a floating body component (5), and a counterweight component (6). The tank (1) is provided with a feed inlet (7) for receiving the liquid to be separated into phases. The light phase discharge pipe (2) is connected to the tank (1) and is used to discharge the light phase liquid after phase separation in the tank (1); The heavy phase discharge pipe (3) is connected to the tank (1) and is used to discharge the heavy phase liquid after phase separation in the tank (1). One end of the heavy phase discharge pipe (3) extends into the tank (1). The sealing plate (4) is rotatably connected to one end of the heavy phase discharge pipe (3) that extends into the tank (1) and has an open position that rotates upward and a closed position that rotates downward. When the sealing plate (4) rotates to the closed position, the side wall of the sealing plate (4) fits against the opening of the heavy phase discharge pipe (3) to block the heavy phase discharge pipe (3). When the sealing plate (4) rotates to the open position, the sealing plate (4) is misaligned with the opening of the heavy phase discharge pipe (3) to open the heavy phase discharge pipe (3). The floating component (5) is connected to the sealing plate (4) via the connecting component (8). When the floating component (5) floats in the heavy phase liquid, it is used to drive the sealing plate (4) to rotate upward to the open position by buoyancy. The counterweight component (6) is connected to the sealing plate (4) and is used to rotate the sealing plate (4) downward to the closed position by gravity when the float component (5) floats in the light phase liquid.

2. The phase separation tank according to claim 1, characterized in that, The heavy phase discharge pipe (3) has a flange mounting part (13) on one end that extends into the tank body (1), and the sealing plate (4) is rotatably connected to the flange mounting part (13).

3. The phase separation tank according to claim 2, characterized in that, The side wall of the sealing plate (4) is attached to the end face of the flange mounting part (13). A Teflon layer is provided on the side wall of the sealing plate (4) that is attached to the flange mounting part (13), and a Teflon layer is also provided on the end face of the flange mounting part (13) that is attached to the sealing plate (4).

4. The phase separation tank according to claim 2, characterized in that, The sealing plate (4) is provided with a lower limit groove (14), and the flange mounting part (13) is connected with a lower limit pin (15) for engaging in the lower limit groove (14) and supporting the sealing plate (4) when the sealing plate (4) is rotated downward to the closed position.

5. The phase separation tank according to claim 2, characterized in that, The sealing plate (4) is provided with an upper limit groove (16), and the flange mounting part (13) is connected with an upper limit pin (17) that fits in the upper limit groove (16) and is used to abut against the bottom of the upper limit groove (16) and limit the sealing plate (4) when the sealing plate (4) is rotated upward to the open position.

6. The phase separation tank according to claim 2, characterized in that, One end of the sealing plate (4) is rotatably connected to the flange mounting part (13), and the other end of the sealing plate (4) is provided with a connecting hole (18). One end of the connecting component (8) is connected to the connecting hole (18), and the other end of the connecting component (8) is connected to the floating body component (5).

7. The phase separation tank according to claim 1, characterized in that, The connecting component (8) is a connecting rope.

8. The phase separation tank according to claim 1, characterized in that, The tank (1) is also provided with an overflow baffle (19). The outer periphery of the overflow baffle (19) is connected to the inner wall of the tank (1). An overflow groove (20) is provided between the overflow baffle (19) and the tank (1). The light phase discharge pipe (2) is connected to the overflow groove (20). The center of the overflow baffle (19) is provided with an overflow channel (21) for the light phase liquid to overflow into the overflow groove (20).

9. The phase separation tank according to claim 8, characterized in that, The overflow enclosure (19) includes a radial extension (22) and an axial extension (23). The outer periphery of the radial extension (22) is connected to the inner wall of the tank (1), and the inner periphery of the radial extension (22) is connected to the lower end of the axial extension (23). The overflow channel (21) is located inside the axial extension (23), and the overflow groove (20) is located between the axial extension (23) and the inner wall of the tank (1).

10. A solvent phase separation and recovery device, characterized in that, It includes a light phase storage tank (24), a heavy phase storage tank (25), a first discharge pump (26), a second discharge pump (27), a first level gauge (28), a second level gauge (29), a first controller, a second controller, and a phase separation tank as described in any one of claims 1 to 9; The light phase discharge pipe (2) is connected to the inlet of the light phase storage tank (24), and the heavy phase discharge pipe (3) is connected to the inlet of the heavy phase storage tank (25). The inlet of the first discharge pump (26) is connected to the outlet of the light phase storage tank (24), and the inlet of the second discharge pump (27) is connected to the outlet of the heavy phase storage tank (25). The first level gauge (28) is installed in the light phase tank (24) and is used to detect the liquid level in the light phase tank (24); The second level gauge (29) is installed in the heavy phase storage tank (25) and is used to detect the liquid level in the heavy phase storage tank (25); The first controller is connected to the first level gauge (28) and the first discharge pump (26) respectively and is used to control the first discharge pump (26) to start discharging according to the liquid level height in the light phase storage tank (24) measured by the first level gauge (28); The second controller is connected to the second level gauge (29) and the second discharge pump (27) respectively and is used to control the second discharge pump (27) to start discharging according to the liquid level height in the heavy phase storage tank (25) measured by the second level gauge (29).

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